| 词条 | SDSS J1254+0846 |
| 释义 |
| name = SDSS J1254+0846 [1] | image = | caption= | epoch = | ra = {{RA|12|54|55.1}} [1] | dec = {{DEC|+08|46|54}} [1] | constellation name = | z = 0.44 [1] | dist_ly = | type = SRBQ[1][6] | appmag_v = | size_v = | notes = | names = }}SDSS J1254+0846 is a face-on binary quasar pair which is in the process of merging.[6] This binary quasar is the first resolved luminous pair to be observed in the act of merging.[8] The pair is composed of two luminous radio-quiet quasars located at redshift z=0.44,[8][10] being SDSS J125455.09+084653.9 (SDSS J1254+0846 A) and SDSS J125454.87+084652.1 (SDSS J1254+0846 B), or SDSS J1254+0846 collectively.[6] These designations also refer to their host galaxies. This pair provide evidence for the theory that quasars are switched on by galactic collisions.[6] The pair are optically separated by 3.6 arcseconds, giving the real separation as 21 kpc. Tidal tails some 75 kpc have been detected around the galaxies.[10] Thus the two galaxies involved are disc galaxies.[6] The pair was first detected by the Sloan Digital Sky Survey, hence the "SDSS" designations.[15] The tidal tails were first observed by the Magellan Telescopes.[16] A computer simulation by Thomas Cox of the Carnegie Institute corroborated the hypothesis that these were two merging galaxies.[16] This binary quasar, was at the time of discovery in 2010, the lowest redshift binary quasar then observed.[6] Prior to this discovery, all quasars in merging binary pairs either involved one luminous quasar, and a second obscured or dark nucleus, or a spatially unresolved pair of active nuclei.[6] Footnotes1. ^Spatially Resolved Binary Quasar 2. ^1 2 3 4 NASA NED, "SDSS J1254+0846" (accessed 2013 January 16) 3. ^1 Chandra X-Ray Observatory, "SDSS J1254+0846: Quasar Pair Captured in Galaxy Collision", 13 December 2010 (accessed 16 December 2013) 4. ^1 2 Green, Paul J.; Myers, A. D.; Barkhouse, W. A.; Mulchaey, J. S.; Bennert, V. N.; Cox, T. J.; Aldcroft, T. L.; Wrobel, J. M.; "A Unique Merging Pair among Luminous Binary Quasars: SDSS J1254+0846"; American Astronomical Society, AAS Meeting #217, #310.04; Bulletin of the American Astronomical Society, Vol. 43, 2011; January 2011; {{bibcode|2011AAS...21731004G}} ; 5. ^1 2 3 4 5 6 7 Green, Paul J.; Myers, Adam D.; Barkhouse, Wayne A.; Mulchaey, John S.; Bennert, Vardha N.; Cox, Thomas J.; Aldcroft, Thomas L.; Wrobel, Joan M.; "SDSS J1254+0846: A Binary Quasar Caught in the Act of Merging"; The Astrophysical Journal, Volume 710, Issue 2, pp. 1578-1588 (2010); February 2010; {{arXiv|1001.1738}} ; {{bibcode|2010ApJ...710.1578G}} ; {{doi|10.1088/0004-637X/710/2/1578}} ; 6. ^1 2 Green, Paul; "SDSS J1254+0846"; CXC Newsletter, Issue 17, p.24; 2010; {{bibcode|2010ChNew..17...24G}} 7. ^1 2 Carnegie Institution for Science, "Merging Galaxies Create a Binary Quasar", Carnegie Observatories, 4 February 2010 (accessed 16 January 2013) References{{reflist|refs=[2][3][4][5][6][7]}} External links
3 : Quasars|Interacting galaxies|SDSS objects |
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