Search: onr:"swepub:oai:DiVA.org:su-144594" >
iPTF Discovery of t...
iPTF Discovery of the Rapid Turn-on of a Luminous Quasar
-
Gezari, S. (author)
-
Hung, T. (author)
-
Cenko, S. B. (author)
-
show more...
-
Blagorodnova, N. (author)
-
Yan, Lin (author)
-
Kulkarni, S. R. (author)
-
Mooley, K. (author)
-
Kong, A. K. H. (author)
-
Cantwell, T. M. (author)
-
Yu, P. C. (author)
-
Cao, Y. (author)
-
- Fremling, Christoffer (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
-
Neill, J. D. (author)
-
Ngeow, C. -C. (author)
-
Nugent, P. E. (author)
-
Wozniak, P. (author)
-
show less...
-
(creator_code:org_t)
- 2017-01-24
- 2017
- English.
-
In: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 835:2
- Related links:
-
https://authors.libr...
-
show more...
-
https://urn.kb.se/re...
-
https://doi.org/10.3...
-
show less...
Abstract
Subject headings
Close
- We present a radio-quiet quasar at z = 0.237 discovered turning on by the intermediate Palomar Transient Factory (iPTF). The transient, iPTF 16bco, was detected by iPTF in the nucleus of a galaxy with an archival Sloan Digital Sky Survey spectrum with weak narrow-line emission characteristic of a low-ionization nuclear emission-line region (LINER). Our follow-up spectra show the dramatic appearance of broad Balmer lines and a power-law continuum characteristic of a luminous (L-bol approximate to 10(45) erg s(-1)) type 1 quasar 12 yr later. Our photometric monitoring with PTF from 2009-2012 and serendipitous X-ray observations from the XMM-Newton Slew Survey in 2011 and 2015 constrain the change of state to have occurred less than 500 days before the iPTF detection. An enhanced broad H alpha/[O III] lambda 5007 line ratio in the type 1 state relative to other changing-look quasars also is suggestive of the most rapid change of state yet observed in a quasar. We argue that the > 10 increase in Eddington ratio inferred from the brightening in UV and X-ray continuum flux is more likely due to an intrinsic change in the accretion rate of a preexisting accretion disk than an external mechanism such as variable obscuration, microlensing, or the tidal disruption of a star. However, further monitoring will be helpful in better constraining the mechanism driving this change of state. The rapid turn-on of the quasar is much shorter than the viscous infall timescale of an accretion disk and requires a disk instability that can develop around a similar to 10(8) M circle dot black hole on timescales less than 1 yr.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- accretion
- accretion disks
- black hole physics
- galaxies: active
- surveys
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database
- By the author/editor
-
Gezari, S.
-
Hung, T.
-
Cenko, S. B.
-
Blagorodnova, N.
-
Yan, Lin
-
Kulkarni, S. R.
-
show more...
-
Mooley, K.
-
Kong, A. K. H.
-
Cantwell, T. M.
-
Yu, P. C.
-
Cao, Y.
-
Fremling, Christ ...
-
Neill, J. D.
-
Ngeow, C. -C.
-
Nugent, P. E.
-
Wozniak, P.
-
show less...
- About the subject
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Physical Science ...
- Articles in the publication
-
Astrophysical Jo ...
- By the university
-
Stockholm University