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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 731612.0, MPI für Astronomie / Publikationen_mpia
Serendipitous discovery of a projected pair of QSOs separated by 4.5 arcsec on the Sky
Authors:Heintz, K. E.; Fynbo, J. P. U.; Krogager, J. -. K.; Vestergaard, M.; Møller, P.; Arabsalmani, M.; Geier, S.; Noterdaeme, P.; Ledoux, C.; Saturni, F. G.; Venemans, B.
Date of Publication (YYYY-MM-DD):2016
Title of Journal:The Astronomical Journal
Issue / Number:1
Start Page:id. 13 (4 pp)
Audience:Not Specified
Abstract / Description:We present the serendipitous discovery of a projected pair of quasi-stellar objects (QSOs) with an angular separation of Δθ = 4.50 arcsec. The redshifts of the two QSOs are widely different: one, our program target, is a QSO with a spectrum consistent with being a narrow line Seyfert 1 active galactic nucleus at z = 2.05. For this target we detect Lyα, C iv, and C iii]. 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 C iv, C iii], and Mg ii. We compare this system to previously detected projected QSO pairs and find that only about a dozen previously known pairs have smaller angular separation. Based on observations made with the Nordic Optical Telescope, on the island of La Palma jointly operated by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias.
Free Keywords:quasars: general
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-6256 %R 10.3847/0004-6256/152/1/13
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