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Article overview
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Tunable-filter imaging of quasar fields at z~1. I. A cluster around MRC B0450-221 | | Joanne C. Baker
; Richard W. Hunstead
; Malcolm N. Bremer
; Joss Bland-Hawthorn
; Ramana M. Athreya
; Jordi Barr
; | | Date: |
14 Dec 2000 | | Subject: | astro-ph | | Abstract: | Using a combination of multicolour broad- and narrow-band imaging techniques and follow-up spectroscopy, we have detected an overdensity of galaxies in the field of quasar MRC B0450-221, whose properties are consistent with a cluster at the quasar redshift z=0.9. An excess of red galaxies (V-I>2.2, I-K’>3.8) is evident within 1’ of the quasar, with the colours expected for galaxies at z=0.9 that have evolved passively for 3 Gyr or more. A number of line-emitting galaxies (nine candidates with equivalent widths EW>70A) are also detected in the field using the TAURUS Tunable Filter (TTF). Three have been confirmed spectroscopically to indeed lie at z=0.9. The TTF candidates with the strongest [O II] line emission cluster in a group which lies 200-700 kpc away from the quasar and the red galaxy excess, and therefore most likely on the outskirts of the cluster. These observations are the first in a series probing quasar environments at z~1 with TTF. | | Source: | arXiv, astro-ph/0012326 | | Services: | Forum | Review | PDF | Favorites | |
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