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Nine-hour X-ray quasi-periodic eruptions from a low-mass black hole galactic nucleus

التفاصيل البيبلوغرافية
العنوان: Nine-hour X-ray quasi-periodic eruptions from a low-mass black hole galactic nucleus
المؤلفون: Anastasios Tzioumis, R. D. Saxton, Margherita Giustini, Poshak Gandhi, Magaretha L. Pretorius, Mickael Coriat, B. Agís-González, Giovanni Miniutti, Christian Knigge, Rob Fender, Kate D. Alexander, Ian Heywood, A. M. Read, I. M. Monageng
المساهمون: Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)
المصدر: Nature
Nature, 2019, 573 (7774), pp.381-384. ⟨10.1038/s41586-019-1556-x⟩
بيانات النشر: Springer Science and Business Media LLC, 2019.
سنة النشر: 2019
مصطلحات موضوعية: Active galactic nucleus, Astrophysics::High Energy Astrophysical Phenomena, Galaxies and clusters, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Tidal disruption event, 0103 physical sciences, ROSAT, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Solar mass, Multidisciplinary, 010308 nuclear & particles physics, Time-domain astronomy, Astrophysical disks, Astrophysics - Astrophysics of Galaxies, Galaxy, Redshift, Accretion (astrophysics), High-energy astrophysics, Black hole, 13. Climate action, Astrophysics of Galaxies (astro-ph.GA), [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Compact astrophysical objects, Astrophysics - High Energy Astrophysical Phenomena
الوصف: In the past two decades, high amplitude electromagnetic outbursts have been detected from dormant galaxies and often attributed to the tidal disruption of a star by the central black hole. X-ray emission from the Seyfert 2 galaxy GSN 069 (2MASX J01190869-3411305) at redshift z = 0.018 was first detected in 2010 July and implies an X-ray brightening of more than a factor of 240 over ROSAT observations performed 16 years earlier. The emission has smoothly decayed over time since 2010, possibly indicating a long-lived tidal disruption event. The X-ray spectrum is ultra-soft and can be described by accretion disc emission with luminosity proportional to the fourth power of the disc temperature during long-term evolution. Here we report observations of X-ray quasi-periodic eruptions from the nucleus of GSN 069 over the course of 54 days, 2018 December onwards. During these eruptions, the X-ray count rate increases by up to two orders of magnitude with event duration of just over 1 hour and recurrence time of about 9 hours. These eruptions are associated with fast spectral transitions between a cold and a warm phase in the accretion flow around a low-mass black hole (of approximately 4x10$^5$ solar masses) with peak X-ray luminosity of ~ 5x10$^{42}$ ergs per second. The warm phase has a temperature of about 120 eV, reminiscent of the typical soft X-ray excess, an almost universal thermal-like feature in the X-ray spectra of luminous active nuclei. If the observed properties are not unique to GSN 069, and assuming standard scaling of timescales with black hole mass and accretion properties, typical active galactic nuclei with more massive black holes can be expected to exhibit high-amplitude optical to X-ray variability on timescales as short as months or years.
Authors' version of a Letter published on-line in Nature on September 11, 2019. Includes Methods and Extended Data. 43 pages, 3 tables and 10 figures
وصف الملف: text
تدمد: 1476-4687
0028-0836
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a8e5ecef90cb0df7c32f551345e1dffc
https://doi.org/10.1038/s41586-019-1556-x
حقوق: OPEN
رقم الأكسشن: edsair.doi.dedup.....a8e5ecef90cb0df7c32f551345e1dffc
قاعدة البيانات: OpenAIRE
الوصف
تدمد:14764687
00280836