An emission-line companion galaxy to the quasar PKS 0405-123

Details An emission-line companion galaxy to the quasar PKS 0405-123 An emission-line companion galaxy to the quasar PKS 0405-123

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97..684m&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, Aug. 1985, p. 684-687. NSF-supported research.

Astronomy and Astrophysics

Astronomy

7

Astronomical Spectroscopy, Emission Spectra, Galactic Structure, Line Spectra, Quasars, Interstellar Matter, Ionization, Oxygen Ions, Red Shift, Ultraviolet Radiation

Scientific paper

A Cryogenic-camera spectrogram of a 20th mag galaxy only 13arcsec in projection from the well-studied quasar PKS 0405-123 (z = 0.57) shows an unusually strong [O II] emission and the usual λ04000 discontinuity. The inferred redshift is consistent with membership in the quasar cluster/group. A brief semiquantitative analysis indicates that the excess [O II] emission results from the ionization of the interstellar medium in this neighbor galaxy by the UV-radiation from the quasar (some 90 h-1kpc from the galaxy). The emission-line strength of this galaxy represents a rare counter-example to quasar-companion galaxies showing rather weak emission lines.

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