JHK Imaging and Photometry of Low z QSOs and Radio Galaxy

Details JHK Imaging and Photometry of Low z QSOs and Radio Galaxy JHK Imaging and Photometry of Low z QSOs and Radio Galaxy

1996-11-22

arxiv.org/abs/astro-ph/9611192v1

Astronomy and Astrophysics

Astrophysics

22 pages of text (latex), 2 tables )latex), and 15 figures (postscript). Accepted for publication in AJ, February 1997. Also a

Scientific paper

10.1086/118275

We describe J,H,K deep imaging of 90 arcmin fields around 4 QSOs and one Radio galaxy at redshifts in the range 0.06 to 0.30, and show their images, luminosity profiles, and NIR 2-colour diagrams of objects. We find that the QSO hosts are all resolved, and compare them with previous CCD images. The host galaxy colours are consistent with old and young stellar populations at the QSO redshift. The colours of nearby galaxies suggest that all the AGN live in groups of generally smaller companion galaxies, mostly with evolved populations at the same redshift. The two radio-loud objects live in richer cluster environments than the others. Gissel population models indicate reddening in the galaxies, star-forming regions, and possibly a systematic H-K offset. The QSO luminosity profiles are complex and reveal some of their tidal disturbance and star-formation history.

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