Discovery of a binary quasar at z=1.76

E. Altamura, S. Brennan, A. Lesniewska, V Pinter, S. N. dos Reis, S. Geier, J. P. U. Fynbo

    Research output: Contribution to journalJournal articleResearchpeer-review

    22 Downloads (Pure)

    Abstract

    We present the serendipitous discovery of a physical pair of quasars with estimated cosmological redshift z = 1.76. Long-slit spectroscopic observations of the candidate quasar GQ 1114+1549A were conducted with the OSIRIS instrument at the Gran Telescopio Canarias. The orientation of the slit allowed OSIRIS to also capture the spectrum of GQ 1114+1549B, an object with angular separation of ΔΘ = 8.76 arcsec from GQ 1114+1549A. Spectral analysis on the Si IV and C IV, C III] emission lines confirmed the quasar nature of GQ 1114+1549A, as well as that of its newly discovered companion. The relative intensity for the emission lines and the shape of the continuum of the two objects were found to be significantly different, rendering the hypothesis of the system being a gravitationally lensed quasar highly unlikely. The projected physical distance between the two quasars was therefore estimated to be 75 kpc.
    Original languageEnglish
    JournalAstronomical Observatory on Skalnate Pleso. Contributions
    Volume49
    Issue number3
    Pages (from-to)528-531
    ISSN1335-1842
    Publication statusPublished - 2019

    Fingerprint

    Dive into the research topics of 'Discovery of a binary quasar at z=1.76'. Together they form a unique fingerprint.

    Cite this