| Issue |
A&A
Volume 381, Number 3, JanuaryIII 2002
|
|
|---|---|---|
| Page(s) | 810 - 824 | |
| Section | Cosmology (including clusters of galaxies) | |
| DOI | https://doi.org/10.1051/0004-6361:20011564 | |
| Published online | 15 January 2002 | |
Deep optical imaging of radio selected BL Lacertae objects *
1
Tuorla Observatory, University of Turku, 21500 Piikkiö, Finland
2
Landessternwarte, Königstuhl, 69117 Heidelberg, Germany
Corresponding author: T. Pursimo, tpursimo@utu.fi
Received:
29
March
2000
Accepted:
19
October
2001
Deep imaging data on radio-selected BL Lacertae objects
are presented. The complete 1 Jy sample
consists of 37 objects.
Altogether 25 objects were observed which span a large range of redshifts
(up to 
) with 12 objects having 
.
In addition, three objects are located at an unknown distance.
Altogether in eleven objects the host galaxy could be resolved.
All nine objects with 
were resolved and
all eleven objects with 
or unknown redshift were unresolved.
In all (six) low-z (
) objects, an elliptical host galaxy
was preferred.
Of the remaining objects,
only in one case (2007+777) did a disc-type galaxy give better fit than
elliptical, but in this case neither can be preferred.
The absolute brightness of the host galaxies
(median 
) is similar to
the findings of X-ray selected BL Lacs and
low redshift radio galaxies. Also the sizes
(median 
kpc) of the galaxies are similar.
This supports the idea that (at least low redshift) BL Lacs
belong to one family of objects.
These results agree well with other recent studies on BL Lacs.
There is a strong correlation between the brightness of the
active nucleus and redshift. At low redshift radio and
X-ray selected BL Lacs have similar brightnesses.
No (or only weak) correlation was found between the
brightness of the nucleus and the host galaxy.
Key words: BL Lacertae objects: general / galaxies: nuclei / galaxies: structure
© ESO, 2002
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.