The Post-Periapse Evolution of Galactic Center Source G1: The second case of a resolved tidal interaction with a supermassive black hole
| العنوان: | The Post-Periapse Evolution of Galactic Center Source G1: The second case of a resolved tidal interaction with a supermassive black hole |
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| المؤلفون: | Leo Meyer, Samantha Chappell, Jessica R. Lu, Tuan Do, Anna Boehle, Rainer Schödel, Breann N. Sitarski, Keith Matthews, Smadar Naoz, Andrea M. Ghez, Mark Morris, G. D. Martinez, Aurélien Hees, Sylvana Yelda, E. E. Becklin, G. Witzel |
| المصدر: | NASA Astrophysics Data System Astrophysical Journal, vol 847, iss 1 The Astrophysical Journal, vol 847, iss 1 Witzel, G; Sitarski, BN; Ghez, AM; Morris, MR; Hees, A; Do, T; et al.(2017). The Post-periapsis Evolution of Galactic Center Source G1: The Second Case of a Resolved Tidal Interaction with a Supermassive Black Hole. ASTROPHYSICAL JOURNAL, 847(1). doi: 10.3847/1538-4357/aa80ea. UCLA: Retrieved from: http://www.escholarship.org/uc/item/9479s1h8 |
| مصطلحات موضوعية: | astro-ph.SR, astro-ph.GA, FOS: Physical sciences, Astrophysics, Astronomy & Astrophysics, 01 natural sciences, Atomic, Physical Chemistry, general [binaries], Particle and Plasma Physics, star clusters: general [galaxies], 0103 physical sciences, Nuclear, 010306 general physics, 010303 astronomy & astrophysics, Stellar evolution, kinematics and dynamics [stars], Solar and Stellar Astrophysics (astro-ph.SR), High Energy Astrophysical Phenomena (astro-ph.HE), Physics, astro-ph.HE, Supermassive black hole, stars [infrared], supermassive black holes [quasars], Galactic Center, Molecular, Astronomy and Astrophysics, Quasar, center [Galaxy], Astrophysics - Astrophysics of Galaxies, Galaxy, Stars, Star cluster, Astrophysics - Solar and Stellar Astrophysics, 13. Climate action, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Orbital motion, Astrophysics - High Energy Astrophysical Phenomena, Astronomical and Space Sciences, Physical Chemistry (incl. Structural) |
| الوصف: | We present new Adaptive Optics (AO) imaging and spectroscopic measurements of Galactic Center source G1 from W. M. Keck Observatory. Our goal is to understand its nature and relationship to G2, which is the first example of a spatially-resolved object interacting with the supermassive black hole (SMBH). Both objects have been monitored with AO for the past decade (2003 - 2014) and are comparatively close to the black hole ($a_{\rm{min}} \sim$200-300 AU) on very eccentric orbits ($e_{\rm{G1}}\sim$0.99; $e_{\rm{G2}}\sim$0.96). While G2 has been tracked before and during periapse passage ($T_{0} \sim$ 2014.2), G1 has been followed since soon after emerging from periapse ($T_{0} \sim$ 2001.3). Our observations of G1 double the previously reported observational time baseline, which improves its orbital parameter determinations. G1's orbital trajectory appears to be in the same plane as that of G2, but with a significantly different argument of periapse ($\Delta\omega$ = 21$\pm$4 degrees). This suggests that G1 is an independent object and not part of a gas stream containing G2 as has been proposed. Furthermore, we show for the first time that: (1) G1 is extended in the epochs closest to periapse along the direction of orbital motion and (2) G1 becomes significantly smaller over time, (450 AU in 2004 to less than 170 AU in 2009). Based on these observations, G1 appears to be the second example of an object tidally interacting with a SMBH. G1's existence 14 years after periapse, along with its compactness in epochs further from the time of periapse, suggest that this source is stellar in nature. Comment: submitted to ApJ |
| وصف الملف: | application/pdf |
| DOI: | 10.3847/1538-4357/aa80ea. |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b11ff0460900a08a4f661d0e1ddb852e https://ui.adsabs.harvard.edu/#abs/2017arXiv170702301W |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....b11ff0460900a08a4f661d0e1ddb852e |
| قاعدة البيانات: | OpenAIRE |
| DOI: | 10.3847/1538-4357/aa80ea. |
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