Issue |
Astron. Astrophys. Suppl. Ser.
Volume 134, Number 3, February I 1999
|
|
---|---|---|
Page(s) | 505 - 521 | |
DOI | https://doi.org/10.1051/aas:1999152 | |
Published online | 15 February 1999 |
Optical morphology of distant RATAN-600 radio galaxies from subarcsecond resolution NOT images *
1
Tuorla Observatory, FIN-21500 Piikkiö, Finland
2
Special Astrophysical Observatory, Radio Astronomy Sector, 35147 Niznij Arkhyz, Karachey-Cherkessia, Russia
3
St. Petersburg Branch of the SAO, Radio Astronomy Laboratory, Pulkovskoe Shosse 65, 196140 St. Petersburg, Russia
4
Astronomical Institute of St. Petersburg University, 198904 St. Petersburg, Russia
5
National Radio Astronomical observatory, P.O. Box 0, Socorro, New Mexico 87801, U.S.A.
Send offprint request to: T. Pursimo
Received:
27
February
1998
Accepted:
7
September
1998
We present direct imaging data
of 22 ultra steep spectrum radio sources
obtained at (or near) a subarcsecond seeing.
The basic sample of 40 double radio sources was selected from
the RATAN-600 catalogue.
The FRII-structure has been
confirmed with VLA
and preliminary optical identifications which come from the 6 m-telescope.
As the RATAN-600 flux limit at 3.9 GHz
(≈ 10 mJy) is fainter
than that of major surveys, the sample may have high-z contents.
This is also suggested by the faint magnitudes in the Hubble diagram.
The final aim is to create a homogeneous sample of high-z
radio galaxies in a well defined strip around the sky, with
faint radio limit and subarcsecond morphology down to
.
We could confirm 16 identifications down to
24.
Most of the extended objects have multicomponent structures
as expected from other surveys of high-redshift radio galaxies.
We found five unresolved objects even
with a subarcsecond seeing. Of the remaining six objects, three
are extremely faint and the other three have such a complex
environment that further observations are needed to confirm
the optical identification.
Key words: galaxies: active; structure / radio continuum: galaxies
© European Southern Observatory (ESO), 1999