Six months of multiwavelength follow-up of the tidal disruption candidate ASASSN-14li and implied TDE rates from ASAS-SN

被引：280

作者：

Holoien, T. W. -S. ^{[1
,2
]}

Kochanek, C. S. ^{[1
,2
]}

Prieto, J. L. ^{[3
,4
]}

Stanek, K. Z. ^{[1
,2
]}

Dong, Subo ^{[5
]}

Shappee, B. J. ^{[6
]}

Grupe, D. ^{[7
]}

Brown, J. S. ^{[1
]}

Basu, U. ^{[1
,8
]}

Beacom, J. F. ^{[1
,2
,9
]}

Bersier, D. ^{[10
]}

Brimacombe, J. ^{[11
]}

Danilet, A. B. ^{[12
]}

Falco, E. ^{[12
]}

Guo, Z. ^{[5
]}

Jose, J. ^{[5
]}

Herczeg, G. J. ^{[5
]}

Long, F. ^{[5
]}

Pojmanski, G. ^{[13
]}

Simonian, G. V. ^{[1
]}

Szczygiel, D. M. ^{[13
]}

Thompson, T. A. ^{[1
,2
]}

Thorstensen, J. R. ^{[14
]}

Wagner, R. M. ^{[1
,15
]}

Wozniak, P. R. ^{[16
]}

机构：

[1] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA

[2] Ohio State Univ, Ctr Cosmol & AstroParticle Phys CCAPP, Columbus, OH 43210 USA

[3] Univ Diego Portales, Nucleo Astron Fac Ingn, Santiago, Chile

[4] Millennium Inst Astrophys, Santiago, Chile

[5] Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China

[6] Carnegie Observ, Pasadena, CA 91101 USA

[7] Morehead State Univ, Dept Earth & Space Sci, Morehead, KY 40351 USA

[8] Grove City High Sch, Grove City, OH 43123 USA

[9] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[10] Liverpool John Moores Univ, Astrophys Res Inst, Liverpool L3 5RF, Merseyside, England

[11] Coral Towers Observ, Cairns, Qld 4870, Australia

[12] Smithsonian Inst, Whipple Observ, Amado, AZ 85645 USA

[13] Warsaw Univ, Astron Observ, PL-00478 Warsaw, Poland

[14] Dartmouth Coll, Dept Phys & Astron, Hanover, NH 03755 USA

[15] Univ Arizona, LBT Observ, Tucson, AZ 85721 USA

[16] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2016年 / 455卷 / 03期

基金：

美国国家航空航天局; 美国国家科学基金会; 美国安德鲁·梅隆基金会; 英国科学技术设施理事会;

关键词：

accretion; accretion discs; black hole physics; galaxies: nuclei; MASSIVE BLACK-HOLE; DIGITAL SKY SURVEY; SWIFT ULTRAVIOLET/OPTICAL TELESCOPE; ACTIVE GALACTIC NUCLEI; X-RAY TELESCOPE; DATA RELEASE; GALAXY; STAR; SPECTROGRAPH; OUTBURST;

D O I：

10.1093/mnras/stv2486

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present ground-based and Swift photometric and spectroscopic observations of the candidate tidal disruption event (TDE) ASASSN-14li, found at the centre of PGC 043234 (d similar or equal to 90 Mpc) by the All-Sky Automated Survey for SuperNovae (ASAS-SN). The source had a peak bolometric luminosity of L similar or equal to 10(44) erg s(-1) and a total integrated energy of E similar or equal to 7 x 10(50) erg radiated over the similar to 6 months of observations presented. The UV/optical emission of the source is well fitted by a blackbody with roughly constant temperature of T similar to 35 000 K, while the luminosity declines by roughly a factor of 16 over this time. The optical/UV luminosity decline is broadly consistent with an exponential decline, L proportional to e(-t/t0), with t(0) similar or equal to 60 d. ASASSN-14li also exhibits soft X-ray emission comparable in luminosity to the optical and UV emission but declining at a slower rate, and the X-ray emission now dominates. Spectra of the source show broad Balmer and helium lines in emission as well as strong blue continuum emission at all epochs. We use the discoveries of ASASSN-14li and ASASSN-14ae to estimate the TDE rate implied by ASAS-SN, finding an average rate of r similar or equal to 4.1 x 10(-5) yr(-1) per galaxy with a 90 per cent confidence interval of (2.2-17.0) x 10(-5) yr(-1) per galaxy. ASAS-SN found roughly 1 TDE for every 70 Type Ia supernovae in 2014, a rate that is much higher than that of other surveys.

引用

页码：2918 / 2935

页数：18

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