AT 2019 pev是位于$z=0.096$的窄线塞弗特1星系中的一个核瞬变。档案紫外线,光学和红外线数据显示潮汐破裂事件(TDE)和活动星系核(AGN)的特征,其性质尚未完全了解。我们提出了详细的X射线观测AT 2019pev采取雨燕,钱德拉和NICER超过173天的演变,因为第一个雨燕XRT时代。X射线亮度在第一个Swift XRT纪元到光变曲线峰值的五天内增加了五倍。光变曲线在$\sim$ 75天内衰减10倍,然后在后期以微弱的再增亮趋势衰减。X射线谱在峰前呈现出“亮时硬”的趋势,峰后呈现出“暗时硬”的趋势,这可能表明吸积态发生了转变。档案地基光学观测显示类似的时间演变的X射线光变曲线。在地面观测的季节限制之外,盖亚的光变曲线在光学发现后223天正朝着同样明亮或更明亮的峰值上升。结合我们的X射线分析和档案多波长数据,AT 2019 pev更接近于活动星系核瞬态。
英文摘要:
AT2019pev is a nuclear transient in a narrow-line Seyfert 1 galaxy at $z=0.096$. The archival ultraviolet, optical and infrared data showed features of both tidal disruption events (TDEs) and active galactic nuclei (AGNs), and its nature is not fully understood. We present detailed X-ray observations of AT2019pev taken with Swift, Chandra and NICER over 173 days of its evolution since the first Swift XRT epoch. The X-ray luminosity increases by a factor of five in five days from the first Swift XRT epoch to the lightcurve peak. The lightcurve decays by a factor of ten over $\sim$75 days and then flattens with a weak re-brightening trend at late times. The X-ray spectra show a "harder-when-brighter" trend before peak and a "harder-when-fainter" trend after peak, which may indicate a transition of accretion states. The archival ground-based optical observations show similar time evolution as the X-ray lightcurves. Beyond the seasonal limit of the ground-based observations, the Gaia lightcurve is rising toward an equally bright or brighter peak 223 days after the optical discovery. Combining our X-ray analysis and archival multi-wavelength data, AT2019pev more closely resembles an AGN transient.
AT2021yky: A Fast-Rising Optical Transient with Evolving Broad Hydrogen Emission Consistent with an Ambiguous Nuclear Transient
The Ohio State University(俄亥俄州立大学);University of Illinois Urbana-Champaign(伊利诺伊大学厄巴纳-香槟分校);Institute for Astronomy, University of Hawai‘i at Manoa(夏威夷大学马诺阿分校天体物理研究所);University of Michigan(密歇根大学);The University of Melbourne(墨尔本大学);University of California, Santa Cruz(加州大学圣克鲁兹分校);University of Cambridge(剑桥大学);Space Telescope Science Institute(太空望远镜科学研究所)
The ambiguous AT2022rze: Changing-look AGN mimicking a supernova in a merging galaxy system
Stockholm University(斯德哥尔摩大学);California Institute of Technology(加州理工学院);University of Minnesota(明尼苏达大学);University of California, Berkeley(加州大学伯克利分校);Russian Academy of Sciences(俄罗斯科学院);Max Planck Institute for Astrophysics(马克斯·普朗克天体物理学研究所)
Lost and Found - A gallery of overlooked optical nuclear transients from the ZTF archive
European Space Agency (ESA), European Space Astronomy Centre (ESAC)(欧洲航天局,欧洲航天天文中心);The Oskar Klein Centre, Department of Astronomy, Stockholm University(奥斯特克·克莱因中心,斯德哥尔摩大学天文学系);IRAP, Université de Toulouse, CNRS, CNES, UPS, Toulouse(图卢兹大学,法国国家科学研究中心,法国国家空间研究中心);Institute of Physics of the Czech Academy of Sciences(捷克科学院物理研究所);Université Clermont Auvergne, CNRS, LPCA, Clermont-Ferrand(克莱蒙奥弗涅大学);Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay(巴黎萨克雷大学);Lomonosov Moscow State University, Sternberg Astronomical Institute(莫斯科罗蒙诺索夫国立大学,斯滕伯格天文研究所);Centre for Astrophysics and Supercomputing, Swinburne University of Technology(斯威本科技大学天体物理学与超级计算中心);ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav)(引力波发现卓越研究中心);Centro de Astrobiología (CAB), CSIC-INTA(西班牙国家航空航天技术研究所天体生物学中心);Telespazio UK for the European Space Agency (ESA), European Space Astronomy Centre (ESAC)(为欧洲航天局服务的英国泰莱斯帕齐奥公司,欧洲航天天文中心)
Unraveling the Nature of the Nuclear Transient AT2020adpi
The Ohio State University(俄亥俄州立大学);University of Hawai’i at Manoa(夏威夷大学马诺阿分校);University of Michigan(密歇根大学);Johns Hopkins University(约翰斯·霍普金斯大学);The University of Melbourne(墨尔本大学);University of California, Santa Cruz(加州大学圣克鲁兹分校);University of Cambridge(剑桥大学);Space Telescope Science Institute(太空望远镜科学研究所)
Searching for Radio Transients with Inverted Spectra in Epoch 1 of VLASS and VCSS, and Identification of a Sample of Candidate Relativistic Nuclear Transients
A Unified Timescale Relation for Quasi-Periodic Eruptions and Repeated Nuclear Transients
University of Science and Technology of China(中国科学技术大学);Guizhou University(贵州大学);Institute of Deep Space Sciences, Deep Space Exploration Laboratory(深空科学研究所,深空探测实验室)
The Search for Thermonuclear Transients from the Tidal Disruption of a White Dwarf by an Intermediate Mass Black Hole
白矮星(WD)与黑洞(BH)的近距离相遇可能导致白矮星的潮汐破坏。在这次相遇中,WD可能会因为潮汐压缩而发生热核爆炸,导致类似Ia型超新星(SN Ia)的光学瞬变,此后称为Ia-TDE。然而,这将仅在BH为$\lesssim 10^5$ M $_\odot$时物理上可观察到。因此,找到Ia-TDE意味着发现了中等质量黑洞(IMBH)$\lesssim 10^5$ M $_\odot$。在这里,我们搜索整个Zwicky瞬态设施(ZTF)警报流的难以捉摸的Ia-TDEs。我们限制我们的搜索核瞬变矮星系,IMBHs的可能网站,并找到了6个可能的核IA-TDE候选人。我们发现SN 1,2020 lrt是最有可能的Ia-TDE候选者,这要归功于它与Ia-TDE的光变曲线和光谱模型的强烈相似性。我们测量的恒星质量的矮星系托管这些瞬变是$\lesssim 10^{9}$ M $_\odot$ ;如果证实港口BH,这些将证明存在的IMBHs在一些已知的最低质量的星系。此外,我们还搜索了核外的Ia-TDE,但在星系外围找不到比核内更强的候选者。这支持了这样一个假设,即核Ia-TDEs候选者是在星系核心被IMBHs潮汐压缩的WD,而不是在星系中任何地方都可能发生的一类瞬态。我们已经为在现有和未来的时域调查中系统地搜索Ia-TDE候选者奠定了基础。快速表征它们的性质不仅会导致Ia-TDE的确认,而且会明…
AT2025agpz in Rubin commissioning data: distinguishing a luminous interacting supernova from nuclear transients in compact galaxies
Queen’s University Belfast(贝尔法斯特女王大学);University of Southampton(南安普顿大学);University of Oxford(牛津大学);Swinburne University of Technology(斯威本科技大学);ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav)(引力波发现卓越研究中心(OzGrav));University of Illinois(伊利诺伊大学)
ASKAP J005512.2-255834: A Luminous, Long-Lived Radio Transient at z = 0.1 -- an Orphan Afterglow or an off-nuclear TDE from an IMBH?
Sydney Institute for Astronomy, School of Physics, The University of Sydney(悉尼大学物理学院天体物理学研究所);ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav)(引力波发现卓越研究中心);Australia Telescope National Facility, CSIRO, Space and Astronomy(CSIRO空间与天文国家望远镜设施);Department of Physics, University of Wisconsin-Milwaukee(威斯康星大学密尔沃基分校物理系)
The ePESSTO+ census of ZTF nuclear transients. I. What flares in galactic nuclei?
Technical University of Denmark(丹麦技术大学);University of Belgrade(贝尔格莱德大学);University of Warsaw(华沙大学);University of Turku(图尔库大学);Institute of Space Sciences (ICE, CSIC)(空间科学研究所(ICE,CSIC));Isaac Newton Group of Telescopes(艾萨克·牛顿望远镜组);Queens University Belfast(贝尔法斯特女王大学);National Centre for Nuclear Research(国家核研究中心);University of Southampton(南安普顿大学);National Central University(中央大学);Sorbonne University(索邦大学)
Stellar Stripping and Disruption in Disks around Supermassive Black Hole Binaries: Repeating nuclear transients prior to LISA events
Space Telescope Science Institute(太空望远镜科学研究所);Johns Hopkins University(约翰斯·霍普金斯大学);Niels Bohr International Academy, Niels Bohr Institute(尼尔斯·玻尔国际学院,尼尔斯·玻尔研究所);Chungbuk National University(忠北国立大学);Aoyama Gakuin University(青山学院大学);University of Zurich(苏黎世大学)
Exploring the connection between compact object mergers and fast X-ray transients: The cases of LXT 240402A and EP250207b
University of Rome Tor Vergata(罗马托尔维加塔大学);Instituto de Astronomía, Universidad Nacional Autónoma de México(墨西哥国立自治大学天文学研究所);Department of Physics, University of Rome La Sapienza(罗马一大物理系);Department of Astronomy and Astrophysics, The Pennsylvania State University(宾夕法尼亚州立大学天文与天体物理学系);McWilliams Center for Cosmology and Astrophysics, Department of Physics, Carnegie Mellon University(卡内基梅隆大学物理系麦克威廉斯宇宙学与天体物理中心);Los Alamos National Laboratory(洛斯阿拉莫斯国家实验室)
The supersoft X-ray transient ASASSN-16oh as a thermonuclear runaway without mass ejection
Maccarone等人(2019年)将超软X射线和光学瞬态ASASSN-16 oh解释为由大质量白矮星上的吸积事件引起的,类似于矮新星超级爆发。这些作者认为,超软X射线光谱的起源与壳层核燃烧加热的大气不同,因为没有物质被喷射出来。相反,我们发现事件的时间尺度和其他特征是典型的非质量喷射热核逃逸,正如Shara等人(1977)和Yaron等人(2005)的新星模型的广泛网格所预测的那样。我们认为,低X射线和辐射热光度的核燃烧模型的预测相比,是由于光学厚的吸积盘,隐藏了大部分的白矮星表面。如果是这样的话,我们计算的光学瞬态可以解释为一个非喷射热核事件的WD $\simeq$ 1.1 M $_\odot$吸积率为$\simeq3.5{-}5{\times}10^{-7}$ M $_\odot$年$^{-1}$。我们的预测应该证明瞬态事件的性质是由于热核燃烧或吸积;观测证据应在未来几年内获得,因为一个新的爆发应该发生在事件的$\simeq$ 10-15年。