Published in
American Astronomical Society, Astronomical Journal, 1(152), p. 13, 2016
DOI: 10.3847/0004-6256/152/1/13
Links
- ORCID
- ORCID
- ORCID
- American Astronomical Society | PDF
- [arxiv.org] | PDF
- [hdl.handle.net]
- [arxiv.org] | PDF
- [repository.arizona.edu] | PDF
Tools
Serendipitous discovery of a projected pair of QSOs separated by 4.5 arcsec on the sky
,
J.-K. Krogager ,
M. Vestergaard ,
P. Møller ,
M. Arabsalmani ,
S. Geier,
P. Noterdaeme,
C. Ledoux,
F. G. Saturni,
B. Venemans
Full text: Download
Abstract
We present the serendipitous discovery of a projected pair of quasi-stellar objects (QSOs) with an angular separation of $Δ\theta =4.50$ arcsec. The redshifts of the two QSOs are widely different: one, our programme target, is a QSO with a spectrum consistent with being a narrow line Seyfert 1 AGN at $z=2.05$. For this target we detect Lyman-$α$, \ion{C}{4}, and \ion{C}{3]}. The other QSO, which by chance was included on the spectroscopic slit, is a Type 1 QSO at a redshift of $z=1.68$, for which we detect \ion{C}{4}, \ion{C}{3]} and \ion{Mg}{2}. We compare this system to previously detected projected QSO pairs and find that only about a dozen previously known pairs have smaller angular separation. ; Comment: 4 pages, 3 figures. Accepted for publication in AJ