arXiv - PHYS - High Energy Astrophysical Phenomena最新文献

{"title":"Accretion Disc Outbursts and Stability Analysis","authors":"Liza Devi, Asish Jyoti Boruah, Biplob Sarkar","doi":"arxiv-2409.11708","DOIUrl":"https://doi.org/arxiv-2409.11708","url":null,"abstract":"Accretion disc outbursts are re-occurring events observed in various\u0000astrophysical systems, including X-ray binaries and cataclysmic variables.\u0000These outbursts are characterized by a sudden increase in luminosity due to\u0000various instabilities in the accretion disc. We need to investigate the\u0000time-dependent accretion flow models to understand the mechanisms driving these\u0000outbursts. Time-dependent models incorporate the disc's time evolution and can\u0000capture the build-up of instabilities. This review aims to give a basic\u0000overview of accretion disc outburst and stability analysis. The paper\u0000highlights the necessity of considering the hierarchy of different timescales,\u0000dynamical, viscous, and thermal, when investigating the instabilities occurring\u0000in the accretion disc. The importance and observational implications of\u0000studying these accretion disc outbursts are also discussed.","PeriodicalId":501343,"journal":{"name":"arXiv - PHYS - High Energy Astrophysical Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142260070","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}

{"title":"Spectro-temporal study of atoll source GX 9+9 observed with AstroSat","authors":"Sree Bhattacherjee, Arbind Pradhan, Biplob Sarkar","doi":"arxiv-2409.11721","DOIUrl":"https://doi.org/arxiv-2409.11721","url":null,"abstract":"In this work, we performed a spectro-temporal investigation of the low-mass\u0000X-ray binary GX 9+9 using the Large Area X-ray Proportional Counter (LAXPC) and\u0000Soft X- ray Telescope (SXT) observation on board AstroSat. The source was\u0000detected in the soft state during the observation, which results in a disk\u0000dominating energy spectrum within the energy range of 0.7-25.0 keV. We carried\u0000out the analysis at different flux levels. In the temporal analysis, LAXPC data\u0000in all flux levels showed the presence of noise components, describing broad\u0000Lorentzian components. We modeled the energy-dependent temporal properties of\u0000the source in order to identify the radiative origin of the observed\u0000variability. This source is not a well-studied source; hence we attempt to\u0000estimate various source characteristics like inner-disk radius, flux, and\u0000inner-disk temperature.","PeriodicalId":501343,"journal":{"name":"arXiv - PHYS - High Energy Astrophysical Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142260068","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}

{"title":"Multimessenger astronomy","authors":"V. Rozhkov, S. Troitsky","doi":"arxiv-2409.11818","DOIUrl":"https://doi.org/arxiv-2409.11818","url":null,"abstract":"This brief review is based on a lecture given by one of the authors at the\u0000international youth conference AYSS-2023. It is devoted to multimessenger\u0000astronomy, which studies astrophysical objects and phenomena using various\u0000particles and waves that bring information from space. The messengers include\u0000electromagnetic and gravitational waves, neutrinos, and cosmic rays. We discuss\u0000new opportunities that open up with the combined use of several carriers of\u0000information. Combination of data obtained through various observation channels\u0000allows one to obtain more complete and accurate information about the processes\u0000occurring in the Universe, and even to use it for studying fundamental physics.","PeriodicalId":501343,"journal":{"name":"arXiv - PHYS - High Energy Astrophysical Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142260067","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}

{"title":"Synchrotron self-Compton in a radiative-adiabatic fireball scenario: Modelling the multiwavelength observations in some Fermi/LAT bursts","authors":"Nissim Fraija, P. Veres, B. Betancourt Kamenetskaia, A. Galvan-Gamez, M. G. Dainotti, Simone Dichiara, R. L. Becerra","doi":"arxiv-2409.12166","DOIUrl":"https://doi.org/arxiv-2409.12166","url":null,"abstract":"Energetic GeV photons expected from the closest and the most energetic\u0000Gamma-ray bursts (GRBs) provide an unique opportunity to study the\u0000very-high-energy emission as well as the possible correlations with lower\u0000energy bands in realistic GRB afterglow models. In the standard GRB afterglow\u0000model, the relativistic homogeneous shock is usually considered to be fully\u0000adiabatic, however, it could be partially radiative. Based on the external\u0000forward-shock scenario in both stellar wind and constant-density medium. We\u0000present a radiative-adiabatic analytical model of the synchrotron self-Compton\u0000(SSC) and synchrotron processes considering an electron energy distribution\u0000with a power-law index of 1 < p < 2 and 2 $leq$ p. We show that the SSC\u0000scenario plays a relevant role in the radiative parameter $epsilon$, leading\u0000to a prolonged evolution during the slow cooling regime. In a particular case,\u0000we derive the Fermi/LAT light curves together with the photons with energies\u0000$geq$ 100 MeV in a sample of nine bursts from the second Fermi/LAT GRB catalog\u0000that exhibited temporal and spectral indices with $geq$ 1.5 and $approx$ 2,\u0000respectively. These events can hardly be described with closure relations of\u0000the standard synchrotron afterglow model, and also exhibit energetic photons\u0000above the synchrotron limit. We have modeled the multi-wavelength observations\u0000of our sample to constrain the microphysical parameters, the circumburst\u0000density, the bulk Lorentz factor and the mechanism responsible for explaining\u0000the energetic GeV photons.","PeriodicalId":501343,"journal":{"name":"arXiv - PHYS - High Energy Astrophysical Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142260064","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}

{"title":"X-ray view of emission lines in optical spectra: Spectral analysis of the two low-mass X-ray binary systems Swift J1357.2-0933 and MAXI J1305-704","authors":"A. Anitra, C. Miceli, T. Di Salvo, R. Iaria, N. Degenaar, M. Jon Miller, F. Barra, W. Leone, L. Burderi","doi":"arxiv-2409.11988","DOIUrl":"https://doi.org/arxiv-2409.11988","url":null,"abstract":"We propose a novel approach for determining the orbital inclination of\u0000low-mass X-ray binary systems by modelling the H$alpha$ and H$beta$ line\u0000profiles emitted by the accretion disc, with a Newtonian version of diskline.\u0000We applied the model to two sample sources, Swift J1357.2-0933 and MAXI\u0000J1305-704, which are both transient black hole systems, and analyse two\u0000observations that were collected during a quiescent state and one observation\u0000of an outburst. The line profile is well described by the diskline model,\u0000although we had to add a Gaussian line to describe the deep inner core of the\u0000double-peaked profile, which the diskline model was unable to reproduce. The\u0000H$beta$ emission lines in the spectrum of Swift J1357.2-0933 and the H$alpha$\u0000emission lines in that of MAXI J1305-704 during the quiescent state are\u0000consistent with a scenario in which these lines originate from a disc ring\u0000between $(9.6-57) times 10^{3}, rm{R_{g}}$ and $(1.94-20) times 10^{4},\u0000rm{R_{g}}$, respectively. We estimate an inclination angle of $81 pm 5$\u0000degrees for Swift J1357.2-0933 and an angle of $73 pm 4$ degrees for MAXI\u0000J1305-704. This is entirely consistent with the values reported in the\u0000literature. In agreement with the recent literature, our analysis of the\u0000outburst spectrum of MAXI J1305-704 revealed that the radius of the emission\u0000region deviates from expected values. This outcome implies several potential\u0000scenarios, including alternative disc configuration or even a circumbinary\u0000disc. We caution that these results were derived from a simplistic model that\u0000may not fully describe the complicated physics of accretion discs. Despite\u0000these limitations, our results for the inclination angles are remarkably\u0000consistent with recent complementary studies, and the proposed description of\u0000the emitting region remains entirely plausible.","PeriodicalId":501343,"journal":{"name":"arXiv - PHYS - High Energy Astrophysical Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142260065","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}

{"title":"A Revised Spin of the Black Hole in GRS 1716-249 with a New Distance","authors":"S. J. Zhao, L. Tao, Q. Q. Yin, S. N. Zhang, R. C. Ma, P. P. Li, Q. C. Zhao, M. Y. Ge, L. Zhang, J. L. Qu, S. Zhang, X. Ma, Y. Huang, J. Q. Peng, Y. X. Xiao","doi":"arxiv-2409.11927","DOIUrl":"https://doi.org/arxiv-2409.11927","url":null,"abstract":"GRS 1716-249 is a stellar-mass black hole in a low-mass X-ray binary that\u0000underwent a gaint outburst in 2016/17. In this paper we use simultaneous\u0000observations of Insight-HXMT and NuSTAR to determine its basic parameters. The\u0000observations were performed during the softest part of the outburst, and the\u0000spectra show clear thermal disk emission and reflection features. We have\u0000fitted the X-ray energy spectra using the joint fitting method of the continuum\u0000and reflection components with the kerrbb2+ relxill model. Since there is a\u0000possibility that the distance to this source was previously underestimated, we\u0000use the latest distance parameter of 6.9 kpc in our study, in contrast to\u0000previous work in which the distance was set at 2.4 kpc. Through spectral\u0000fitting of fixing black hole mass at 6.4 $M_{rm odot}$, we observe a strong\u0000dependence of the derived spin on the distance: $a_{*}=0.972_{-0.005}^{+0.004}$\u0000at an assumed distance of 2.4 kpc and $a_{*}=0.464_{-0.007}^{+0.016}$ at an\u0000assumed distance of 6.9 kpc, at a confidence level of 90%. If considering the\u0000uncertainties in the distance and black hole mass, there will be a wider range\u0000of spin with $a_{*}$ < 0.78. The fitting results with the new distance indicate\u0000that GRS 1716-249 harbors a moderate spin black hole with an inclined ($isim\u000040-50^{circ}$) accretion disk around it. Additionally, we have also found that\u0000solely using the method of the reflection component fitting but ignoring the\u0000constraints on the spin from the accretion disk component will result in an\u0000extremely high spin.","PeriodicalId":501343,"journal":{"name":"arXiv - PHYS - High Energy Astrophysical Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142260066","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}

{"title":"Short-term variability of the transitional pulsar candidate CXOU J110926.4-650224 from X-rays to infrared","authors":"F. Coti Zelati, D. de Martino, V. S. Dhillon, T. R. Marsh, F. Vincentelli, S. Campana, D. F. Torres, A. Papitto, M. C. Baglio, A. Miraval Zanon, N. Rea, J. Brink, D. A. H. Buckley, P. D'Avanzo, G. Illiano, A. Manca, A. Marino","doi":"arxiv-2409.11719","DOIUrl":"https://doi.org/arxiv-2409.11719","url":null,"abstract":"CXOU J110926.4-650224 is a candidate transitional millisecond pulsar (tMSP)\u0000with X-ray and radio emission properties reminiscent of those observed in\u0000confirmed tMSPs in their X-ray 'subluminous' disc state. We present the results\u0000of observing campaigns that, for the first time, characterise the optical and\u0000near-infrared variability of this source and establish a connection with the\u0000mode-switching phenomenon observed in X-rays. The optical emission exhibited\u0000flickering activity, frequent dipping episodes where it appeared redder, and a\u0000multi-peaked flare where it was bluer. The variability pattern was strongly\u0000correlated with that of the X-ray emission. Each dip matched an X-ray low-mode\u0000episode, indicating that a significant portion of the optical emission\u0000originates from nearly the same region as the X-ray emission. The near-infrared\u0000emission also displayed remarkable variability, including a dip of 20 min in\u0000length during which it nearly vanished. Time-resolved optical spectroscopic\u0000observations reveal significant changes in the properties of emission lines\u0000from the disc and help infer the spectral type of the companion star to be\u0000between K0 and K5. We compare the properties of CXOU J110926.4-650224 with\u0000those of other tMSPs in the X-ray subluminous disc state and discuss our\u0000findings within the context of a recently proposed scenario that explains the\u0000phenomenology exhibited by the prototypical tMSP PSR J1023+0038.","PeriodicalId":501343,"journal":{"name":"arXiv - PHYS - High Energy Astrophysical Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142260069","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}

{"title":"The Faraday rotation measure of the M87 jet at 3.5mm with the Atacama Large Millimeter/submillimeter Array","authors":"Sijia Peng, Ru-Sen Lu, Ciriaco Goddi, Thomas P. Krichbaum, Zhiyuan Li, Ruo-Yu Liu, Jae-Young Kim, Masanori Nakamura, Feng Yuan, Liang Chen, Ivan Marti-Vidal, Zhiqiang Shen","doi":"arxiv-2409.12028","DOIUrl":"https://doi.org/arxiv-2409.12028","url":null,"abstract":"Faraday rotation is an important probe of the magnetic fields and magnetized\u0000plasma around active galactic nuclei (AGN) jets. We present a Faraday rotation\u0000measure image of the M87 jet between 85.2 GHz and 101.3 GHz with a resolution\u0000of ~2\" with the Atacama Large Millimeter/submillimeter Array (ALMA). We found\u0000that the rotation measure (RM) of the M87 core is $rm (4.5pm\u00000.4)times10^{4} rad m^{-2}$ with a low linear polarization fraction of $rm\u0000(0.88pm 0.08)%$. The spatial RM gradient in the M87 jet spans a wide range\u0000from $sim -2times10^4rm~rad m^{-2}$ to $sim 3times10^4rm~rad m^{-2}$\u0000with a typical uncertainty of $0.3times10^4rm~rad m^{-2}$. A comparison with\u0000previous RM measurements of the core suggests that the Faraday rotation of the\u0000core may originate very close to the super massive black hole (SMBH). Both an\u0000internal origin and an external screen with a rapidly varying emitting source\u0000could be possible. As for the jet, the RM gradient indicates a helical\u0000configuration of the magnetic field that persists up to kpc scale. Combined\u0000with the kpc-scale RM measurements at lower frequencies, we found that RM is\u0000frequency-dependent in the jet. One possible scenario to explain this\u0000dependence is that the kpc-scale jet has a trumpet-like shape and the jet coil\u0000unwinds near its end.","PeriodicalId":501343,"journal":{"name":"arXiv - PHYS - High Energy Astrophysical Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142260098","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}

{"title":"Modelling the Energy-dependent broadband variability in the black-hole transient GX 339-4 using Astrosat and NICER","authors":"Hitesh Tanenia, Akash Garg, Ranjeev Misra, Somasri Sen","doi":"arxiv-2409.11875","DOIUrl":"https://doi.org/arxiv-2409.11875","url":null,"abstract":"We present a spectro-timing analysis of the black hole X-ray transient GX\u0000339-4 using simultaneous observations from Astrosat and NICER during the 2021\u0000outburst period. The combined spectrum obtained from NICER, LAXPC, and SXT data\u0000is effectively described by a model comprising a thermal disk component, hard\u0000Comptonization component, and reflection component with an edge. Our analysis\u0000of the Astrosat and NICER spectra indicates the source to be in a low/hard\u0000state, with a photon index of ~1.64. The Power Density Spectra (PDS) obtained\u0000from both Astrosat and NICER observations exhibit two prominent broad features\u0000at 0.22 Hz and 2.94 Hz. We generated energy-dependent time lag and fractional\u0000root mean square (frms) at both frequencies in a broad energy range of 0.5-30\u0000keV and found the presence of hard lags along with a decrease in variability at\u0000higher energy levels. Additionally, we discovered that the correlated\u0000variations in accretion rate, inner disc radius, coronal heating rate, and the\u0000scattering fraction, along with a delay between them, can explain the observed\u0000frms and lag spectra for both features.","PeriodicalId":501343,"journal":{"name":"arXiv - PHYS - High Energy Astrophysical Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142269459","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}

{"title":"Investigating the CREDIT history of supernova remnants as cosmic-ray sources","authors":"Anton Stall, Chun Khai Loo, Philipp Mertsch","doi":"arxiv-2409.11012","DOIUrl":"https://doi.org/arxiv-2409.11012","url":null,"abstract":"Supernova remnants (SNRs) have long been suspected to be the primary sources\u0000of Galactic cosmic rays. Over the past decades, great strides have been made in\u0000the modelling of particle acceleration, magnetic field amplification, and\u0000escape from SNRs. Yet, while many SNRs have been observed in non-thermal\u0000emission in radio, X-rays, and gamma-rays, there is no evidence for any\u0000individual object contributing to the locally observed flux. Here, we propose a\u0000particular spectral signature from individual remnants that is due to the\u0000energy-dependent escape from SNRs. For young and nearby sources, we predict\u0000fluxes enhanced by tens of percent in narrow rigidity intervals; given the\u0000percent-level flux uncertainties of contemporary cosmic-ray data, such features\u0000should be readily detectable. We model the spatial and temporal distribution of\u0000sources and the resulting distribution of fluxes with a Monte Carlo approach.\u0000The decision tree that we have trained on simulated data is able to\u0000discriminate with very high significance between the null hypothesis of a\u0000smooth distribution of sources and the scenario with a stochastic distribution\u0000of individual sources. We suggest that this cosmic-ray energy-dependent\u0000injection time (CREDIT) scenario be considered in experimental searches to\u0000identify individual SNRs as cosmic-ray sources.","PeriodicalId":501343,"journal":{"name":"arXiv - PHYS - High Energy Astrophysical Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142260104","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}