The systemic redshift of the quasar 1331 + 170

R. F. Carswell*, C. M. Mountain, D. J. Robertson, S. M. Beard, A. R. Glendinning, D. C. Laird, L. C. Lawrence, D. Montgomery, G. Pentland, D. A. Pickup, I. A. Smith, J. A. Bailey, A. Bridger, M. M. Casali, T. R. Geballe, P. Puxley, M. G. Smith, G. S. Wright, S. K. Ramsay, A. C. Baker & 2 others B. R. Espey, M. J. Ward

*Corresponding author for this work

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Infrared spectra covering the 1.6 and 2 μm regions of the quasar 1331 + 170, redshift z = 2.09, were obtained with the CGS4 spectrometer at the UK Infrared Telescope. These spectra show redshifted Hα, Hβ and [O III] lines. The redshifts of the forbidden lines are similar to the low-ionization lines measured at optical wave-lengths but are significantly higher than the high-ionization line redshift. Thus the low-ionization lines are likely to provide a reliable estimate for the systematic redshift in this object, and the high-ionization material is therefore flowing out from, or into, the quasar and is subject to some obscuration.

Original languageEnglish
JournalAstrophysical Journal
Issue number1 PART 2
Publication statusPublished - 1 Nov 1991


  • Line profiles
  • Quasars

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    Carswell, R. F., Mountain, C. M., Robertson, D. J., Beard, S. M., Glendinning, A. R., Laird, D. C., ... Ward, M. J. (1991). The systemic redshift of the quasar 1331 + 170. Astrophysical Journal, 381(1 PART 2).