HS 1216+5032: a physical quasar pair with one radio-loud broad absorption line quasar

Details HS 1216+5032: a physical quasar pair with one radio-loud broad absorption line quasar HS 1216+5032: a physical quasar pair with one radio-loud broad absorption line quasar

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mnras.349.1261g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 349, Issue 4, pp. 1261-1266.

Astronomy and Astrophysics

Astronomy

1

Gravitational Lensing, Quasars: Absorption Lines, Quasars: Individual: Hs 1216+5032, X-Rays: General, X-Rays: Individual: Hs 1216+5032

Scientific paper

We report on new multiwavelength observations of HS 1216+5032, a pair of quasi-stellar objects (QSOs) at z= 1.45 separated by 9.1 arcsec, which has been a perennial candidate for a massive dark lens. We explore high signal-to-noise ratio optical spectra from the MMT of both components, which show that aside from the effects of absorption, the emission-line profiles are quite similar. Near-infrared spectra from the United Kingdom Infrared Telescope show identical velocities in Hα emission, but a significant difference in the strength of the narrow component, which is difficult to explain in a lens scenario. We highlight that, based on data from the Very Large Array Faint Images of the Radio Sky survey, HS 1216+5032B is a radio-loud broad absorption line QSO, which certifies HS 1216+5032 as a physical quasar pair. Intriguingly, both quasars show spectroscopic evidence for high accretion rates and large Eddington ratios L/LEdd, supporting the hypothesis that close galaxy interactions trigger nuclear activity.

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