Optical spectra of four objects identified with variable radio sources

Authors
Chavushyan, V Mujica, R Gorshkov, AG Konnikova, VK Mingaliev, MG
Citation
V. Chavushyan et al., Optical spectra of four objects identified with variable radio sources, ASTRON LETT, 26(6), 2000, pp. 339-343
Citations number
13
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS
ISSN journal
10637737 → ACNP
Volume
26
Issue
6
Year of publication
2000
Pages
339 - 343
Database
ISI
SICI code
1063-7737(200006)26:6<339:OSOFOI>2.0.ZU;2-O
Abstract
We obtained optical spectra of four objects identified with variable radio sources. Three objects (0029+0554, 0400+0550, 2245+0500) were found to be q uasars with redshifts of 1.314, 0.761, and 1.091. One object (2349+0534) ha s a continuum spectrum characteristic of BL Lac objects. We analyze spectra of the radio sources in the range 0.97-21.7 GHz for the epoch 1997 and in the range 3.9-11.1 GHz for the epoch 1990, as well as the pattern of variab ility of their flux densities on time scales of 1.5 and 7 years. (C) 2000 M AIK "Nauka/Interperiodica".