Bibcode
Mezcua, M.; Chavushyan, V. H.; Lobanov, A. P.; León-Tavares, J.
Bibliographical reference
Astronomy and Astrophysics, Volume 544, id.A36
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8
2012
Journal
Citations
19
Refereed citations
17
Description
We present new spectroscopic identifications of 12 X-shaped radio
galaxies and use the spectral data to derive starburst histories and
masses of the nuclear supermassive black holes in these galaxies. The
observations were done with the 2.1-m telescope of the Observatorio
Astronómico Nacional at San Pedro Mártir, México.
The new spectroscopic results extend the sample of X-shaped radio
galaxies studied with optical spectroscopy. We show that the combined
sample of the X-shaped radio galaxies has statistically higher
black-hole masses and older episodes of star formation than a control
sample of canonical double-lobed radio sources with similar redshifts
and luminosities. The data reveal enhanced star-formation activity in
the X-shaped sample on the timescales expected in galactic mergers. We
discuss the results obtained in the framework of the merger scenario.
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