Open AccessOptical and infrared observations of the luminous quasar PDS 456: a radio‐quiet analogue of 3C 273?
Author(s) -
Simpson Chris,
Ward Martin,
O'Brien Paul,
Reeves James
Publication year - 1999
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.1999.02344.x
Subject(s) - physics , quasar , infrared , quiet , astrophysics , redshift , photometry (optics) , astronomy , emission spectrum , luminous infrared galaxy , infrared astronomy , spectroscopy , galaxy , spectral line , stars
We present infrared photometry and optical and infrared spectroscopy of the recently discovered, extremely luminous nearby quasar PDS 456. A number of broad emission features are seen in the near‐infrared, which we are unable to identify. We measure a more accurate redshift from a narrow forbidden emission line and compare the optical‐‐infrared spectrum to that of 3C 273. The close similarity suggests that PDS 456 is a radio‐quiet analogue of 3C 273, although radio observations do not support this idea.