The Astrophysical Journal Letters最新文献_第4页

A Two-hump Spectrum in the Prompt Emission of GRB 240825A GRB 240825A快速发射的双驼峰光谱

The Astrophysical Journal Letters Pub Date : 2025-05-05 DOI: 10.3847/2041-8213/adcf1a

Hai-Ming Zhang, Zi-Qi Wang, Cui-Yuan Dai, Yi-Yun Huang, Wen-Qiang Liang, Ruo-Yu Liu, En-Wei Liang and Xiang-Yu Wang

{"title":"A Two-hump Spectrum in the Prompt Emission of GRB 240825A","authors":"Hai-Ming Zhang, Zi-Qi Wang, Cui-Yuan Dai, Yi-Yun Huang, Wen-Qiang Liang, Ruo-Yu Liu, En-Wei Liang and Xiang-Yu Wang","doi":"10.3847/2041-8213/adcf1a","DOIUrl":"https://doi.org/10.3847/2041-8213/adcf1a","url":null,"abstract":"An extra hard spectral component that extends to GeV energies, in additional to the typical sub-MeV Band component, appears in several gamma-ray bursts (GRBs) detected by the Fermi Large Area Telescope. Only in one case (i.e., GRB 090926A) is a spectral break feature at the high-energy end identified in the extra hard component, but the photon counts are not enough to distinguish between the cutoff model and the broken power-law model for the spectral break. In this work, we report the detection of an extra hard component showing the spectral break in GRB 240825A. We find that a broken power-law model fits the spectral data of the extra component better than a single power law with an exponential cutoff in the time-resolved spectrum for the second emission pulse, with a break at about 40 MeV. This spectral feature disfavors the gamma-ray opacity to pair creation as the origin of the spectral break, but points to an intrinsic peak for the extra component. The low ratio between the peak of the extra hard component and that of the Band component challenges the synchrotron self-Compton origin for the extra component. Alternative scenarios, such as the inverse Compton scattering of the photosphere emission, are discussed. In addition, we find a clear transition from the prompt emission to afterglow emission at GeV energies in GRB 240825A, manifested by a temporal steep decay and a unique spectral evolution.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143909970","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

MeerKAT H i Observations of Low Surface Brightness/Ultradiffuse Galaxy Candidates Projected around Two Southern Loose Groups MeerKAT H在两个南部松散群周围投射的低表面亮度/超漫射星系候选者的观测

The Astrophysical Journal Letters Pub Date : 2025-05-05 DOI: 10.3847/2041-8213/adcee1

Chandreyee Sengupta, Tom C. Scott, Hao Chen, Hyein Yoon, Yogesh Chandola, Mengtian Li, Gyula I. G. Józsa, O. Ivy Wong, Yin-Zhe Ma, Patricio Lagos, Ruta Kale and Denis Tramonte

{"title":"MeerKAT H i Observations of Low Surface Brightness/Ultradiffuse Galaxy Candidates Projected around Two Southern Loose Groups","authors":"Chandreyee Sengupta, Tom C. Scott, Hao Chen, Hyein Yoon, Yogesh Chandola, Mengtian Li, Gyula I. G. Józsa, O. Ivy Wong, Yin-Zhe Ma, Patricio Lagos, Ruta Kale and Denis Tramonte","doi":"10.3847/2041-8213/adcee1","DOIUrl":"https://doi.org/10.3847/2041-8213/adcee1","url":null,"abstract":"A large catalog of low surface brightness galaxies (LSBGs) from the Dark Energy Survey showed significant clustering around nearby galaxy groups and clusters. Using the HIPASS survey, we tried to determine the redshift of a subsample of these LSBGs and determine whether they were members of the groups they were projected near, but this was hampered by HIPASS’s high spectral rms. This Letter reports on MeerKAT H i observations to determine the redshifts of 52 LSBG candidates projected in the vicinity of two groups from our previous HIPASS study. The main goal is to investigate and ascertain whether these LSBGs are genuine group members. H i was detected with MeerKAT and redshifts were determined for only five of the 52 candidates within a velocity range of ±2500 km s−1 of their respective group velocities. All five H i detections were blue LSBGs, and two of them were confirmed to be ultradiffuse galaxies (UDGs). Both these UDGs were group members, while the other three detections were either foreground or background galaxies. In this Letter we explore scenarios that can explain the 90% nondetection. MeerKAT’s excellent sensitivity allows us to conclude that the majority of the nondetected candidates, particularly the blue galaxies, are not group members but lie at higher redshifts. However, this still leaves the open question of why Tanoglidis LSBG candidates, in particular the red ones, appear to be clustered in projection around nearby groups.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143909808","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

“CY1” Chondrites Produced by Impact Dehydration of the CI Chondrite Parent Body CI球粒陨石母体撞击脱水产生的“CY1”球粒陨石

The Astrophysical Journal Letters Pub Date : 2025-05-05 DOI: 10.3847/2041-8213/adc89c

Ke Zhu, 柯朱, Nao Nakanishi, Jan Render, Quinn R. Shollenberger, Tetsuya Yokoyama, Akira Ishikawa and Lu Chen

{"title":"“CY1” Chondrites Produced by Impact Dehydration of the CI Chondrite Parent Body","authors":"Ke Zhu, 柯朱, Nao Nakanishi, Jan Render, Quinn R. Shollenberger, Tetsuya Yokoyama, Akira Ishikawa and Lu Chen","doi":"10.3847/2041-8213/adc89c","DOIUrl":"https://doi.org/10.3847/2041-8213/adc89c","url":null,"abstract":"The recently proposed Yamato-type (CY) chondrites share significant similarities with CI chondrites and Ryugu. We present major and trace elemental, Re–Os, and mass-independent Ti, Cr, and Fe isotope data for seven CY chondrites. The elemental data along with isotopic compositions reveal two distinct lithologies, here designated as CY1 and CY2, potentially originating from two different parent bodies. Although sharing similarities with CM chondrites, CY2 chondrites have distinct Cr isotope compositions, arguing against a close genetic relationship. The CY1 lithology exhibits elemental abundances similar to CI chondrites/Ryugu as well as Fe, Ti, and Cr isotope compositions that closely overlap with those of CI chondrites/Ryugu. This suggests that CI chondrites, CY1 chondrites, and Ryugu accreted in the same region of the solar system and may even originate from the same parent body. In fact, we find that the reduced water content and certain volatile element abundances alongside increased sulfide content and mass-dependent O isotope enrichments observed in CY1 compared to CI chondrites could be attributed to an impact-induced heating event on the CI parent body. This impact likely disrupted the CI parent body, resulting in the ejection of both CI and CY1 lithologies. Furthermore, given that there are presently only five known CI meteorite specimens, the close chemical composition between CY1 and CI chondrites substantially expands the data set for comparisons and referrals to the bulk solar system composition for nonvolatile elements. Finally, we propose that the “CY1” chondrites could be called “CI1T,” while the designation “CY” chondrites could be restricted to “CY2” samples.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"98 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143915588","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

The Ophiuchus DIsk Survey Employing ALMA (ODISEA): A Unified Evolutionary Sequence of Planet-driven Substructures Explaining the Diversity of Disk Morphologies 基于ALMA （ODISEA）的蛇夫座圆盘调查：行星驱动的亚结构的统一进化序列解释了蛇夫座圆盘形态的多样性

The Astrophysical Journal Letters Pub Date : 2025-05-05 DOI: 10.3847/2041-8213/adcd58

Santiago Orcajo, Lucas A. Cieza, Octavio Guilera, Sebastián Pérez, Fernando R. Rannou, Camilo González-Ruilova, Grace Batalla-Falcon, Trisha Bhowmik, Prachi Chavan, Simon Casassus, Anuroop Dasgupta, Kevin Diaz, José L. Gomez, Antonio S. Hales, J. M. Miley, Marcelo M. Miller Bertolami, P.H. Nogueira, María Paula Ronco, Dary Ruiz-Rodriguez, Anibal Sierra, Julia Venturini, Philipp Weber, Jonathan P. Williams and Alice Zurlo

{"title":"The Ophiuchus DIsk Survey Employing ALMA (ODISEA): A Unified Evolutionary Sequence of Planet-driven Substructures Explaining the Diversity of Disk Morphologies","authors":"Santiago Orcajo, Lucas A. Cieza, Octavio Guilera, Sebastián Pérez, Fernando R. Rannou, Camilo González-Ruilova, Grace Batalla-Falcon, Trisha Bhowmik, Prachi Chavan, Simon Casassus, Anuroop Dasgupta, Kevin Diaz, José L. Gomez, Antonio S. Hales, J. M. Miley, Marcelo M. Miller Bertolami, P.H. Nogueira, María Paula Ronco, Dary Ruiz-Rodriguez, Anibal Sierra, Julia Venturini, Philipp Weber, Jonathan P. Williams and Alice Zurlo","doi":"10.3847/2041-8213/adcd58","DOIUrl":"https://doi.org/10.3847/2041-8213/adcd58","url":null,"abstract":"Understanding the origin of substructures in protoplanetary disks and their connection to planet formation is currently one of the main challenges in astrophysics. While some disks appear smooth, most exhibit diverse substructures such as gaps, rings, or inner cavities, with varying brightness and depth. As part of the Ophiuchus DIsk Survey Employing ALMA, we previously proposed an evolutionary sequence to unify this diversity, driven by the formation of giant planets through core accretion and subsequent planet–disk interactions. By combining the disk evolution and planet formation code PlanetaLP with the radiative transfer code radmc-3D, we have now reproduced the key aspects of the proposed evolutionary sequence. Starting with a smooth disk (like, e.g., WLY 2-63), we modeled the evolution of a fiducial disk with a 1 MJup planet at 57 au. Within a few hundred orbits, a narrow gap forms, resembling ISO-Oph 17. By ∼0.1 Myr, the gap widens, and dust accumulates at the cavity edge, producing a structure similar to Elias 2-24. At ∼0.4 Myr, the disk evolves further into a morphology akin to DoAr 44, characterized by a smaller inner disk and a brighter inner rim. By ∼1 Myr, the system transitions to a single narrow ring resembling RXJ1633.9–2442. This line of work strongly supports the planetary origin of substructures and enables the possibility of identifying a population of planets that is currently beyond the reach of more direct detection techniques.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"63 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143915589","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

The Ejection of Transient Jets in Swift J1727.8−1613 Revealed by Time-dependent Visibility Modeling 雨燕J1727.8−1613中瞬态射流的抛射现象

The Astrophysical Journal Letters Pub Date : 2025-05-05 DOI: 10.3847/2041-8213/adc9b3

Callan M. Wood, James C. A. Miller-Jones, Arash Bahramian, Steven J. Tingay, He-Xin Liu, Diego Altamirano, Rob Fender, Elmar Körding, Dipankar Maitra, Sera Markoff, David M. Russell, Thomas D. Russell, Craig L. Sarazin, Gregory R. Sivakoff, Roberto Soria, Alexandra J. Tetarenko and Valeriu Tudose

{"title":"The Ejection of Transient Jets in Swift J1727.8−1613 Revealed by Time-dependent Visibility Modeling","authors":"Callan M. Wood, James C. A. Miller-Jones, Arash Bahramian, Steven J. Tingay, He-Xin Liu, Diego Altamirano, Rob Fender, Elmar Körding, Dipankar Maitra, Sera Markoff, David M. Russell, Thomas D. Russell, Craig L. Sarazin, Gregory R. Sivakoff, Roberto Soria, Alexandra J. Tetarenko and Valeriu Tudose","doi":"10.3847/2041-8213/adc9b3","DOIUrl":"https://doi.org/10.3847/2041-8213/adc9b3","url":null,"abstract":"High angular resolution radio observations of relativistic jets are necessary to understand the causal connection between accretion and jet ejection in low-mass X-ray binaries. Images from these observations can be difficult to reconstruct due to the rapid intra-observational motion and variability of transient jets. We have developed a time-dependent visibility model fitting and self-calibration procedure and applied it to a single 4 hr VLBA observation of the low-mass X-ray binary Swift J1727.8−1613 during the bright flaring period of its 2023 outburst. This allowed us to detect and model a slightly resolved self-absorbed compact core, as well as three downstream transient jet knots. We were able to precisely measure the proper motion and flux density variability of these three jet knots, as well as (for the first time) their intra-observational expansion. Using simultaneous multifrequency data, we were also able to measure the spectral index of the furthest downstream jet knot, and the core, as well as the frequency-dependent core shift between 2.3 and 8.3 GHz. Using these measurements, we inferred the ejection dates of the three jet knots, including one to within ±40 minutes, which is one of the most precise ever measured. The ejection of the transient jet knots coincided with a bright X-ray flare and a drastic change in the X-ray spectral and timing properties as seen by HXMT, which is the clearest association ever seen between the launching of transient relativistic jets in an X-ray binary and a sudden change in the X-ray properties of the accretion inflow.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"281 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143909953","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

JWST’s Sharper View of EX Lup: Cold Water from Ice Sublimation during Accretion Outbursts JWST对EX - up的更清晰的观察：吸积爆发期间冰升华产生的冷水

The Astrophysical Journal Letters Pub Date : 2025-05-05 DOI: 10.3847/2041-8213/adcab8

Sarah A. Smith, Carlos E. Romero-Mirza, Andrea Banzatti, Christian Rab, Péter Ábrahám, Ágnes Kóspál, Rik Claes, Carlo F. Manara, Karin I. Öberg, Jeroen Bouwman, Fernando Cruz-Sáenz de Miera and Joel D. Green

{"title":"JWST’s Sharper View of EX Lup: Cold Water from Ice Sublimation during Accretion Outbursts","authors":"Sarah A. Smith, Carlos E. Romero-Mirza, Andrea Banzatti, Christian Rab, Péter Ábrahám, Ágnes Kóspál, Rik Claes, Carlo F. Manara, Karin I. Öberg, Jeroen Bouwman, Fernando Cruz-Sáenz de Miera and Joel D. Green","doi":"10.3847/2041-8213/adcab8","DOIUrl":"https://doi.org/10.3847/2041-8213/adcab8","url":null,"abstract":"The unstable accretion phases during pre-main-sequence evolution of T Tauri stars produce variable irradiation and heating of planet-forming regions. A strong accretion outburst was observed with Spitzer-InfraRed Spectrograph in 2008 in EX Lup, the prototype of EXor variables, and found to increase the mid-infrared water and OH emission and decrease organic emission, suggesting large chemical changes. We present here two JWST-MIRI epochs of quiescent EX Lup in 2022 and 2023 obtained over a decade after the 2008 outburst and several months after a moderate burst in 2022. With JWST’s sharper spectral view, we can now analyze water emission as a function of temperature in the two MIRI epochs and, approximately, also in the previous Spitzer epochs. This new analysis shows a strong cold water vapor “burst” in low-energy lines during the 2008 outburst, which we consider clear evidence for enhanced ice sublimation due to a recession of the snowline, as found in protostellar envelopes. JWST shows that EX Lup still has an unusually strong emission from cold water in comparison to other T Tauri disks, suggesting >10 yr long freeze-out timescales in the inner disk surface. EX Lup demonstrates that outbursts can significantly change the observed organic-to-water ratios and increase the cold water reservoir, providing chemical signatures to study the recent accretion history of disks. This study provides an unprecedented demonstration of the chemical evolution triggered by accretion outbursts in the class II phase and of the high potential of time-domain experiments to reveal processes that may have fundamental implications on planet-forming bodies near the snowline.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143909955","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

Coincident Multimessenger Bursts from Eccentric Supermassive Binary Black Holes 来自偏心超大质量双黑洞的重合多信使爆发

The Astrophysical Journal Letters Pub Date : 2025-05-05 DOI: 10.3847/2041-8213/adccb8

Vikram Manikantan, Vasileios Paschalidis and Gabriele Bozzola

{"title":"Coincident Multimessenger Bursts from Eccentric Supermassive Binary Black Holes","authors":"Vikram Manikantan, Vasileios Paschalidis and Gabriele Bozzola","doi":"10.3847/2041-8213/adccb8","DOIUrl":"https://doi.org/10.3847/2041-8213/adccb8","url":null,"abstract":"Supermassive binary black holes are a key target for the future Laser Interferometer Space Antenna and excellent multimessenger sources across the electromagnetic (EM) spectrum. However, unique features of their EM emission that are needed to distinguish them from single supermassive black holes are still being established. Here, we conduct the first magnetohydrodynamic simulation of disk accretion onto equal-mass, nonspinning, eccentric binary black holes in full general relativity, incorporating synchrotron radiation transport through the dual jet in postprocessing. Focusing on a binary in the strong-field dynamical spacetime regime with eccentricity e = 0.3 as a point of principle, we show that the total accretion rate exhibits periodicity on the binary orbital period. We also show, for the first time, that this periodicity is reflected in the jet Poynting luminosity and the optically thin synchrotron emission from the jet base. Furthermore, we find a distinct EM signature for eccentric binaries: they spend more time in a low emission state (at apocenter) and less in a high state (at pericenter). Additionally, we find that the eccentric binary quasiperiodic gravitational-wave (GW) bursts are coincident with the bursts in Poynting luminosity and synchrotron emission. Finally, we discuss how multimessenger EM and GW observations of these systems can help probe plasma physics in their jet.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143909809","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

Little Red Dots Are Tidal Disruption Events in Runaway-collapsing Clusters 小红点是失控坍缩星团中的潮汐破坏事件

The Astrophysical Journal Letters Pub Date : 2025-05-05 DOI: 10.3847/2041-8213/adce6c

Jillian Bellovary

引用次数: 0

Star-crossed Clusters: Asteroseismic Ages for Individual Stars Are in Tension with the Ages of Their Host Clusters 星系团：单个恒星的星震年龄与其主星系团的年龄是紧张的

The Astrophysical Journal Letters Pub Date : 2025-05-05 DOI: 10.3847/2041-8213/adcd6f

Jamie Tayar and Meridith Joyce

引用次数: 0

Unveiling a Young Thick Disk in the Milky Way 揭开银河系中年轻厚盘的面纱

The Astrophysical Journal Letters Pub Date : 2025-05-05 DOI: 10.3847/2041-8213/adccb7

Jianhui Lian, Min Du, Shuai Lu, Bingqiu Chen, Gail Zasowski, Zhaoyu Li, Xiaojie Liao and Chao Liu

{"title":"Unveiling a Young Thick Disk in the Milky Way","authors":"Jianhui Lian, Min Du, Shuai Lu, Bingqiu Chen, Gail Zasowski, Zhaoyu Li, Xiaojie Liao and Chao Liu","doi":"10.3847/2041-8213/adccb7","DOIUrl":"https://doi.org/10.3847/2041-8213/adccb7","url":null,"abstract":"The thickness of a galaxy’s disk provides a valuable probe of its formation and evolution history. Observations of the Milky Way and local galaxies have revealed an ubiquitous disk structure with two distinctive components: an old thick disk and a relatively young thin disk. The formation of this dual-disk structure and the mechanisms that develop the thickness of the disk are still unclear. Whether the disk thickness is inherited from the birth environment or is established through secular dynamical heating after formation is under debate. In this work, we identify a relatively young (∼6.6 billion yr old), geometric thick disk in the Milky Way, with a scale height of 0.64 kpc at the solar circle. This young, thick component exhibits comparable thickness and flaring strength to the canonical old thick disk but is more radially extended and systematically younger. We also identify thin disk components that formed before and after this young thick disk. Detailed analysis of the solar vicinity structure suggests that the young thick disk marks the onset of a new phase of upside-down disk formation. These findings strongly discount the role of secular dynamical heating and support a turbulent, bursty birth environment as the primary mechanism behind thick disk formation. The existence of two thick disk components suggests that the Milky Way has undergone at least two episodes of turbulent and bursty star formation, likely triggered by galaxy mergers.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143909806","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