The Astrophysical Journal最新文献_第5页

HOLESOM: Constraining the Properties of Slowly Accreting Massive Black Holes with Self-organizing Maps HOLESOM：用自组织映射约束缓慢吸积大质量黑洞的性质

The Astrophysical Journal Pub Date : 2025-06-03 DOI: 10.3847/1538-4357/adced9

Valentina La Torre and Fabio Pacucci

{"title":"HOLESOM: Constraining the Properties of Slowly Accreting Massive Black Holes with Self-organizing Maps","authors":"Valentina La Torre and Fabio Pacucci","doi":"10.3847/1538-4357/adced9","DOIUrl":"https://doi.org/10.3847/1538-4357/adced9","url":null,"abstract":"Accreting massive black holes (MBHs, with M• > 103M⊙) are known for their panchromatic emission, spanning from radio to gamma rays. While MBHs accreting at significant fractions of their Eddington rate are readily detectable, those accreting at much lower rates in radiatively inefficient modes often go unnoticed, blending in with other astrophysical sources. This challenge is particularly relevant for gas-starved MBHs in external galaxies and those possibly wandering in the Milky Way. We present HOLESOM (HOLESOM is publicly available at: https://github.com/valentinalatorre/holesom), a machine learning-powered tool based on the self-organizing maps (SOMs) algorithm, specifically designed to identify slowly accreting MBHs using sparse photometric data. Trained on a comprehensive set of ∼20,000 spectral energy distributions, HOLESOM can (i) determine if the photometry of a source is consistent with slowly accreting MBHs and (ii) estimate its black hole mass and Eddington ratio, including uncertainties. We validate HOLESOM through extensive tests on synthetic data and real-world cases, including Sagittarius A⋆ (Sgr A⋆), demonstrating its effectiveness in identifying slowly accreting MBHs. Additionally, we derive analytical relations between radio and X-ray luminosities to further constrain physical parameters. The primary strength of HOLESOM lies in its ability to accurately identify MBH candidates, which can then be targeted for follow-up photometric and spectroscopic observations. Fast and scalable, HOLESOM offers a robust framework for automatically scanning large multiwavelength data sets, making it a valuable tool for unveiling hidden MBH populations in the local Universe.","PeriodicalId":501813,"journal":{"name":"The Astrophysical Journal","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144211130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nonstandard Thermal History and Formation of Primordial Black Holes and SIGWs in Einstein–Gauss–Bonnet Gravity Einstein-Gauss-Bonnet引力中原始黑洞和sigw的非标准热历史和形成

The Astrophysical Journal Pub Date : 2025-06-03 DOI: 10.3847/1538-4357/adcee5

Yogesh and Abolhassan Mohammadi

{"title":"Nonstandard Thermal History and Formation of Primordial Black Holes and SIGWs in Einstein–Gauss–Bonnet Gravity","authors":"Yogesh and Abolhassan Mohammadi","doi":"10.3847/1538-4357/adcee5","DOIUrl":"https://doi.org/10.3847/1538-4357/adcee5","url":null,"abstract":"In this article, we examine the formation of primordial black holes (PBHs) in the mutated hilltop inflation model coupled with the Einstein–Gauss–Bonnet term. A suitable choice of the coupling function can produce the ultra-slow-roll (USR) regime during the inflationary phase, which lasts for some number of e-folds leading to a significant enhancement to the curvature power spectrum for small scales so that it grows up to the order of ; a crucial feature for producing PBH and scalar-induced gravitational waves (SIGWs). We investigate the formation of PBHs for different sets of parameters. The presented model is capable of producing PBH in a wide range of mass, from to . PBHs with mass can account for the microlensing event in Optical Gravitational Lensing Experiment as well as the asteroid masses ; PBH can be attributed to 100% of the dark matter present in the Universe. Whereas PBHs in the mass range are compatible with LIGO-Virgo data. Our investigation is generalized to include the effect of nonstandard thermal history with an equation of state 1/3 < ω ≤ 1 on PBHs, and it is shown that this possibility can severely impact the formation and abundance of PBHs. The enhancement of the scalar power spectrum also leads to the SIGWs. It is realized that, by increasing ω, there is a slight enhancement of the SIGWs. Moreover, produced SIGWs are well within the detectable frequency ranges of current and future detectors.","PeriodicalId":501813,"journal":{"name":"The Astrophysical Journal","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144218758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Persistent Disk Wind and Variable Jet Outflow in the Neutron-star Low-mass X-Ray Binary GX 13+1 中子星-低质量x射线双星GX 13+1中持续的盘风和可变喷流

The Astrophysical Journal Pub Date : 2025-06-03 DOI: 10.3847/1538-4357/adcabe

Daniele Rogantini, Jeroen Homan, Richard M. Plotkin, Maureen van den Berg, James Miller-Jones, Joey Neilsen, Deepto Chakrabarty, Rob P. Fender and Norbert Schulz

{"title":"A Persistent Disk Wind and Variable Jet Outflow in the Neutron-star Low-mass X-Ray Binary GX 13+1","authors":"Daniele Rogantini, Jeroen Homan, Richard M. Plotkin, Maureen van den Berg, James Miller-Jones, Joey Neilsen, Deepto Chakrabarty, Rob P. Fender and Norbert Schulz","doi":"10.3847/1538-4357/adcabe","DOIUrl":"https://doi.org/10.3847/1538-4357/adcabe","url":null,"abstract":"In low-mass X-ray binaries (LMXBs), accretion flows are often associated with either jet outflows or disk winds. Studies of LMXBs with luminosities up to roughly 20% of the Eddington limit indicate that these outflows generally do not co-occur, suggesting that disk winds might inhibit jets. However, previous observations of LMXBs accreting near or above the Eddington limit show that jets and winds can potentially coexist. To investigate this phenomenon, we carried out a comprehensive multiwavelength campaign (using the Very Large Array (VLA), Chandra/High Energy Transmission Grating Spectrometer (HETG), and NICER) on the near-Eddington neutron-star Z-source LMXB GX 13+1. NICER and Chandra/HETG observations tracked GX 13+1 across the entire Z track during high Eddington rates, detecting substantial resonance absorption features originating from the accretion disk wind in all X-ray spectra, which implies a persistent wind presence. Simultaneous VLA observations captured a variable radio jet, with radio emission notably strong during all flaring branch observations—contrary to typical behavior in Z sources—and weaker when the source was on the normal branch. Interestingly, no clear correlation was found between the radio emission and the wind features. Analysis of VLA radio light curves and simultaneous Chandra/HETG spectra demonstrates that an ionized disk wind and jet outflow can indeed coexist in GX 13+1, suggesting that their launching mechanisms are not necessarily linked in this system.","PeriodicalId":501813,"journal":{"name":"The Astrophysical Journal","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144211127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Initiation Route of Coronal Mass Ejections. II. The Role of Filament Mass 日冕物质抛射的起始路径。2。纤维质量的作用

The Astrophysical Journal Pub Date : 2025-06-03 DOI: 10.3847/1538-4357/adceb5

Chen Xing, Xin Cheng, Guillaume Aulanier and Mingde Ding

{"title":"Initiation Route of Coronal Mass Ejections. II. The Role of Filament Mass","authors":"Chen Xing, Xin Cheng, Guillaume Aulanier and Mingde Ding","doi":"10.3847/1538-4357/adceb5","DOIUrl":"https://doi.org/10.3847/1538-4357/adceb5","url":null,"abstract":"A thorough understanding of the initiation of coronal mass ejections (CMEs), which is manifested as a slow rise of pre-eruptive structures before the impulsive ejection in kinematics, is key for forecasting solar eruptions. In our previous work, we showed that the slow rise of a hot flux rope with coronal mass density is caused by the moderate magnetic reconnection occurring in the hyperbolic flux tube (HFT) combined with the torus instability. However, it remains unclear how the initiation process varies when a filament is present in the pre-eruptive flux rope. In this work, we reveal the complete initiation route of a CME containing filament mass with a state-of-the-art full-magnetohydrodynamics simulation. The comprehensive analyses show that the filament mass has an important impact on the CME initiation through triggering and driving the slow rise of flux rope with its drainage, besides the contributions of HFT reconnection and torus instability. Finally, in combination with our previous work, we propose that the enhanced drainage of filament mass and various features related to the HFT reconnection, such as the split of pre-eruptive structure and the preflare loops and X-ray emissions, can serve as precursors of CME initiation in observations.","PeriodicalId":501813,"journal":{"name":"The Astrophysical Journal","volume":"12 1","pages":"37"},"PeriodicalIF":0.0,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144218757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Using Machine Learning Method for Variable Star Classification Using the TESS Sectors 1–57 Data 利用机器学习方法对TESS 1-57扇区数据进行变星分类

The Astrophysical Journal Pub Date : 2025-06-02 DOI: 10.3847/1538-4357/add159

Li-Heng Wang, Kai Li, Xiang Gao, Ya-Ni Guo and Guo-You Sun

引用次数: 0

An Investigation of Disk Thickness in M51 from Hα, Paα, and Mid-infrared Power Spectra 从Hα、Paα和中红外功率光谱研究M51的圆盘厚度

The Astrophysical Journal Pub Date : 2025-06-02 DOI: 10.3847/1538-4357/adcee6

Bruce G. Elmegreen, Daniela Calzetti, Angela Adamo, Karin Sandstrom, Daniel Dale, Varun Bajaj, Martha L. Boyer, Ana Duarte-Cabral, Ryan Chown, Matteo Correnti, Julianne J. Dalcanton, Bruce T. Draine, Brandt Gaches, John S. Gallagher, Kathryn Grasha, Benjamin Gregg, Leslie K. Hunt, Kelsey E. Johnson, Robert Kennicutt, Ralf S. Klessen, Adam K. Leroy, Sean Linden, Anna F. McLeod, Matteo Messa, Göran Östlin, Mansi Padave, Julia Roman-Duval, J. D. Smith, Fabian Walter and Tony D. Weinbeck

{"title":"An Investigation of Disk Thickness in M51 from Hα, Paα, and Mid-infrared Power Spectra","authors":"Bruce G. Elmegreen, Daniela Calzetti, Angela Adamo, Karin Sandstrom, Daniel Dale, Varun Bajaj, Martha L. Boyer, Ana Duarte-Cabral, Ryan Chown, Matteo Correnti, Julianne J. Dalcanton, Bruce T. Draine, Brandt Gaches, John S. Gallagher, Kathryn Grasha, Benjamin Gregg, Leslie K. Hunt, Kelsey E. Johnson, Robert Kennicutt, Ralf S. Klessen, Adam K. Leroy, Sean Linden, Anna F. McLeod, Matteo Messa, Göran Östlin, Mansi Padave, Julia Roman-Duval, J. D. Smith, Fabian Walter and Tony D. Weinbeck","doi":"10.3847/1538-4357/adcee6","DOIUrl":"https://doi.org/10.3847/1538-4357/adcee6","url":null,"abstract":"Power spectra (PS) of high-resolution images of M51 (NGC 5194) taken with the Hubble Space Telescope and the James Webb Space Telescope (JWST) have been examined for evidence of disk thickness in the form of a change in slope between large scales, which map two-dimensional correlated structures, and small scales, which map three-dimensional correlated structures. Such a slope change is observed here in Hα, and possibly Paα, using average PS of azimuthal intensity scans that avoid bright peaks. The physical scale of the slope change occurs at ∼120 pc and ∼170 pc for these two transitions, respectively. A radial dependence in the shape of the Hα PS also suggests that the length scale drops from ∼180 pc at 5 kpc, to ∼90 pc at 2 kpc, to ∼25 pc in the central ∼kpc. We interpret these lengths as comparable to the thicknesses of the star-forming disk traced by H ii regions. The corresponding emission measure is ∼100 times larger than what is expected from the diffuse ionized gas. The PS of JWST Mid-IR Instrument images in eight passbands have more gradual changes in slope, making it difficult to determine a specific value of the thickness for this emission.","PeriodicalId":501813,"journal":{"name":"The Astrophysical Journal","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144202175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multimessenger Signatures of a Deformed Magnetar in Gamma-Ray Bursts 伽玛射线暴中变形磁星的多信使特征

The Astrophysical Journal Pub Date : 2025-06-02 DOI: 10.3847/1538-4357/adceb0

Parisa Hashemi, Soroush Shakeri, Yu Wang, Liang Li and Rahim Moradi

{"title":"Multimessenger Signatures of a Deformed Magnetar in Gamma-Ray Bursts","authors":"Parisa Hashemi, Soroush Shakeri, Yu Wang, Liang Li and Rahim Moradi","doi":"10.3847/1538-4357/adceb0","DOIUrl":"https://doi.org/10.3847/1538-4357/adceb0","url":null,"abstract":"We study the evolution of a newly formed magnetized neutron star (NS) as a power source of gamma-ray bursts (GRBs) in the light of both gravitational-wave (GW) and electromagnetic (EM) radiation. The compressible and incompressible fluids are employed in order to model the secular evolution of stable Maclaurin spheroids. It is shown that the GW and EM emissions evolve as a function of eccentricity and rotational frequency with time. We find that the luminosity characteristics crucially depend on NS parameters such as magnitude and structure of magnetic field, ellipticity, and the equation of state (EoS) of the fluid. The presence of X-ray flares, whose origins are not yet well understood, can be captured in our model regarding some specific nuclear EoSs. Our model allows us to explain flares that occur within the wide range of 10–104 s and the peak EM luminosity in the order of 1046–1051erg s−1 by using a reasonable set of parameters, such as magnetic field strength around 1014–1016 G and the quadrupole-to-dipole ratio of magnetic field up to 500. By applying our model to a sample of GRB X-ray flares observed by the Swift/X-ray Telescope, we try to constraint the crucial parameters of a deformed magnetar via a Markov Chain Monte Carlo fitting method. Our analysis shows that ongoing and upcoming joint multimessenger detections can be used to understand the nature of a GRB’s central engine and its evolution at the early times of the burst formation.","PeriodicalId":501813,"journal":{"name":"The Astrophysical Journal","volume":"81 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144202172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Model-agnostic Cosmological Inference with SDSS-IV eBOSS: Simultaneous Probing for the Background and Perturbed Universe 用SDSS-IV eBOSS进行模型不可知论的宇宙学推断：同时探测背景和扰动宇宙

The Astrophysical Journal Pub Date : 2025-06-02 DOI: 10.3847/1538-4357/adcee8

Purba Mukherjee and Anjan A Sen

{"title":"Model-agnostic Cosmological Inference with SDSS-IV eBOSS: Simultaneous Probing for the Background and Perturbed Universe","authors":"Purba Mukherjee and Anjan A Sen","doi":"10.3847/1538-4357/adcee8","DOIUrl":"https://doi.org/10.3847/1538-4357/adcee8","url":null,"abstract":"Here, we explore certain subtle features imprinted in data from the completed Sloan Digital Sky Survey IV (SDSS-IV) extended Baryon Oscillation Spectroscopic Survey (eBOSS) as a combined probe for the background and perturbed universe. We reconstruct the baryon acoustic oscillation and redshift space distortion observables as functions of redshift, using measurements from SDSS alone. We apply the multi-task Gaussian process framework to model the interdependencies of cosmological observables DM(z)/rd, DH(z)/rd, and fσ8(z), and track their evolution across different redshifts. Subsequently, we obtain a constrained three-dimensional phase space containing DM(z)/rd, DH(z)/rd, and fσ8(z) at different redshifts probed by the SDSS-IV eBOSS survey. Furthermore, assuming the Λ-cold dark matter (ΛCDM) model, we obtain constraints on model parameters Ωm, H0rd, σ8, and S8 at each redshift probed by SDSS-IV eBOSS. This indicates redshift-dependent trends in H0, Ωm, σ8, and S8 in the ΛCDM model, suggesting a possible inconsistency in the ΛCDM model. Ours is a template for model-independent extraction of information for both a background and perturbed universe using a single galaxy survey, taking into account all the existing correlations between background and perturbed observables and this can be easily extended to future DESI-3YR as well as Euclid results.","PeriodicalId":501813,"journal":{"name":"The Astrophysical Journal","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144202111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the Origin of Spectral Features Observed during Thermonuclear X-Ray Bursts and in the Aftermath Emission of a Long Burst from 4U 1820–30 关于在热核x射线爆发期间观测到的光谱特征的起源和4U 1820-30长爆发的余波

The Astrophysical Journal Pub Date : 2025-06-02 DOI: 10.3847/1538-4357/adcc24

Gaurava K. Jaisawal, Jérôme Chenevez, Tod E. Strohmayer, Hendrik Schatz, J. J. M. in ’t Zand, Tolga Güver, Diego Altamirano, Zaven Arzoumanian and Keith C. Gendreau

{"title":"On the Origin of Spectral Features Observed during Thermonuclear X-Ray Bursts and in the Aftermath Emission of a Long Burst from 4U 1820–30","authors":"Gaurava K. Jaisawal, Jérôme Chenevez, Tod E. Strohmayer, Hendrik Schatz, J. J. M. in ’t Zand, Tolga Güver, Diego Altamirano, Zaven Arzoumanian and Keith C. Gendreau","doi":"10.3847/1538-4357/adcc24","DOIUrl":"https://doi.org/10.3847/1538-4357/adcc24","url":null,"abstract":"We study 15 thermonuclear X-ray bursts from 4U 1820–30 observed with the Neutron Star Interior Composition Explorer (NICER). We find evidence of a narrow emission line at 1.0 keV and three absorption lines at 1.7, 3.0, and 3.75 keV, primarily around the photospheric radius expansion phase of most bursts. The 1.0 keV emission line remains constant, while the absorption features, attributed to wind-ejected species, are stable but show slight energy shifts, likely due to combined effects of Doppler and gravitational redshifts. We also examine with NICER the “aftermath” of a long X-ray burst (a candidate superburst observed by MAXI) on 2021 August 23 and 24. The aftermath emission recovers within half a day from a flux depression. During this recovery phase, we detect two emission lines at 0.7 and 1 keV, along with three absorption lines whose energies decrease to 1.57, 2.64, and 3.64 keV. Given the nature of the helium white dwarf companion, these absorption lines during the aftermath may originate from an accretion flow, but only if the accretion environment is significantly contaminated by nuclear ashes from the superburst. This provides evidence of temporary metal enhancement in the accreted material due to strong wind loss. Moreover, we suggest that the absorption features observed during the short X-ray bursts and in the superburst aftermath share a common origin in heavy nuclear ashes enriched with elements like Si, Ar, Ca, or Ti, either from the burst wind or from an accretion flow contaminated by the burst wind.","PeriodicalId":501813,"journal":{"name":"The Astrophysical Journal","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144202173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Thorough Exploration of the Metal-rich Massive Open Cluster NGC 6253: Focusing on Membership, Binaries, Stragglers, and Mass Function 对富金属大质量疏散星团NGC 6253的深入探索：关注成员、双星、离散星和质量函数

The Astrophysical Journal Pub Date : 2025-06-02 DOI: 10.3847/1538-4357/adcf22

Huanbin Chi, 焕斌迟, Feng Wang and 锋王

{"title":"A Thorough Exploration of the Metal-rich Massive Open Cluster NGC 6253: Focusing on Membership, Binaries, Stragglers, and Mass Function","authors":"Huanbin Chi, 焕斌迟, Feng Wang and 锋王","doi":"10.3847/1538-4357/adcf22","DOIUrl":"https://doi.org/10.3847/1538-4357/adcf22","url":null,"abstract":"This study provides an in-depth analysis of the ancient open galactic cluster NGC 6253, characterized by the presence of both blue and yellow straggler stars. Utilizing a hybrid approach that integrates DBSCAN and Gaussian mixture models with GAIA Data Release 3, we effectively identified the cluster members, discovering 11 blue and 7 yellow stragglers. The structure of the cluster considerably exceeds its tidal radius, which implies that there is an evident tidal tail structure. A calculated relaxation time of 32.469 Myr, which is considerably shorter than its 3.5 Gyr age, indicates that NGC 6253 has attained dynamic relaxation. The mass segregation timescale observed for most stars in our sample is brief compared to the cluster’s age, offering strong evidence of mass segregation. Orbital integration using the MWPotential2014 model and analysis of binary members further corroborate our results. The birth radius of 6.78 kpc suggests formation within the solar circle. Our research into the present mass function reveals a top-heavy distribution common to both single and binary star populations. Additionally, our analysis shows that among binary systems, more massive binaries are more centrally located compared to their less massive counterparts, underscoring the significant role of binary stars in shaping the cluster’s overall mass distribution.","PeriodicalId":501813,"journal":{"name":"The Astrophysical Journal","volume":"102 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144218760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0