Multicolor images of spatially resolved structures around high-redshift quasars

Details Multicolor images of spatially resolved structures around high-redshift quasars Multicolor images of spatially resolved structures around high-redshift quasars

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...393...68l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 393, no. 1, July 1, 1992, p. 68-80.

Astronomy and Astrophysics

Astrophysics

63

Active Galactic Nuclei, Near Infrared Radiation, Quasars, Radio Galaxies, Red Shift, Image Analysis, Star Formation Rate, Stellar Luminosity, Stellar Magnitude

Scientific paper

Multicolor optical and near-IR images of spatially resolved continuum-emitting structures ('fuzz') around six high-redshift radio-loud quasars are presented. This fuzz is most plausibly interpreted as the stellar population of the host galaxy of the quasar. The quasars are well-resolved spatially in the near-IR (K-band) images. In four of the six cases the fuzz is at least 1.5 mag redder in (B - K) than in the central quasar, so that it is unlikely that the near-IR fuzz is generally quasar light scattered by either dust or electrons in the quasar halo. The fuzz is also resolved in at least two, and possibly four of the six cases in the optical images. The measured spectral energy distributions in the two best-resolved cases are similar to those of the most actively star-forming present-day galaxies. If the rest-frame UV fuzz is indeed starlight, the fuzz luminosities imply star-formation rates of several hundred solar masses per year in these two objects. The optical and near-IR properties of the fuzz are strikingly similar to those of radio galaxies at similarly high redshifts.

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