Volume 511, February 2010
|Number of page(s)||4|
|Published online||26 February 2010|
A quasar companion to the puzzling quasar SDSS J0927+2943*
Università degli Studi dell'Insubria, via Valleggio 11,
22100 Como, Italy
2 MPIA, Königstuhl 17, 69117, Heidelberg, Germany e-mail: email@example.com
3 INAF - Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy
4 Istituto Naz. Fis. Nucleare - Università di Milano-Bicocca, Piazza della Scienza 3, 20126 Milano, Italy
Accepted: 23 December 2009
We report the discovery of a quasar close to SDSS J0927+2943 (z = 0.713), which is a massive binary/recoiling black hole candidate. The companion quasar is at a projected distance of 125 kpc and exhibits a radial velocity difference of ~1400 km s-1 with respect to the known quasar. We discuss the nature of this peculiar quasar pair and the properties of its environment. We propose that the overall system is caught in the process of ongoing structure formation.
Key words: quasars: general / quasars: emission lines / quasars: individual: SDSS J092712.65+294344.0
© ESO, 2010
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