Serendipitous Discovery of a Projected Pair of QSOs Separated by 4.5 arcsec on the Sky

• Published in: The Astronomical Journal
• Main 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.
• Other Authors: Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2016
• Subjects: quasars: general; Astrophysics - High Energy Astrophysical Phenomena; Astrophysics - Astrophysics of Galaxies; [SDU]Sciences of the Universe [physics]; Iceland
• Online Access: https://hal.science/hal-03645128; https://doi.org/10.3847/0004-6256/152/1/13

International audience 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...