The nature of intermediate-redshift damped Ly-alpha absorbers
| dc.creator | Brun, V. Le | |
| dc.creator | Bergeron, J. | |
| dc.creator | Boisse, P. | |
| dc.creator | Deharveng, J. -M. | |
| dc.date | 1996-11-05 | |
| dc.date.accessioned | 2026-07-07T06:29:11Z | |
| dc.date.available | 2026-07-07T06:29:11Z | |
| dc.description | We present HST/WFPC2 high-spatial resolution images in the R and B bands of the close environment of the sightlines to seven quasars which spectra show either a damped Ly-alpha absorption line, 21cm absorption, or a very strong MgII/FeII absorption system at intermediate redshifts (0.4 < z < 1). Objects down to about 0.3", or 2.0 kpc at z=0.6 (H0 = 50 kms/s/Mpc, q0=0), and to a limiting magnitude m(702, lim)=25.9 could be detected for seven fields comprising eight absorbers (one at higher redshift z=1.78 towards MC 1331+170) with high HI column densities of at least 1x10^20 cm^-2. In each case, a candidate absorber with absolute magnitude Mb =-19.0 or much brighter has been detected. This small sample of gas-rich galaxies at intermediate redshifts covers a wide range in morphological types. There are three spiral galaxies of various sizes and luminosities (towards 3C 196, Q 1209+107 and MC 1331+170), three compact objects (towards EX 0302-223, PKS 0454+039 and, at high redshift, MC 1331+170), and two amorphous, low surface brightness galaxies (towards PKS 1229-021 and 3C 286). In the fields around 3C 196, PKS 1229-021 and Q 1209+107, there is an excess of galaxies in the PC2 images, suggestive of the presence of a group of galaxies associated with the damped Ly-alpha absorber, or maybe with the quasar itself for the two z = 1.0 cases. For 3C 196 and 3C 286, the quasar host galaxies have also tentatively been discovered. | |
| dc.description | 21 Pages, LaTeX using A&A macros l-aa.sty 3.0, 16 images (including 7 jpeg plates). Plates also available as postscript (110kB each in gzipped format) at ftp://lasm0b.astrsp-mrs.fr/vlebrun/lbbd/ , and can be included manually in the source by uncommenting the corresponding lines in the TeX file, if desired. The full postscript-gzipped file (1.3MB) with all figures can be found at ftp://lasm0b.astrsp-mrs.fr/vlebrun/lbbd/lbbd.ps-gz . Accepted for Publication in A&A Main Journal | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9611031 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9611031 | |
| dc.identifier | Astron.Astrophys. 321 (1997) 733-748 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/97944 | |
| dc.subject | Astrophysics | |
| dc.title | The nature of intermediate-redshift damped Ly-alpha absorbers | |
| dc.type | text |