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J/other/RAA/19.127 C- and S-shaped radio galaxies (Liu+, 2019)
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Beginning of ReadMe :J/other/RAA/19.127 C- and S-shaped radio galaxies (Liu+, 2019)
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The environment of C- and S-shaped radio galaxies.
Liu Y.-X., Xu H.-G., Zheng D.-C., Li W.-T., Zhu Z.-H., Ma Z.-X., Lian X.-L.
<Res. Astron. Astrophys., 19, 127 (2019)>
=2019RAA....19..127L (SIMBAD/NED BibCode)
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ADC_Keywords: Galaxies, radio ; Redshifts ; Photometry ; Morphology
Keywords: galaxies: statistics - galaxies: structure - methods: data analysis
Abstract:
We study the environment of radio galaxies with different
morphological types using the Proctor sample, which was built from the
Faint Images of the Radio Sky at Twenty-Centimeters (FIRST) survey
archive. Among the 15 radio galaxy types classified by Proctor, 199
C-shaped (i.e., wide- or narrow-angle tail) and 203 S-shaped (i.e., S-
or Z-shaped) sources are selected in this work, which are located in
the redshift range of 0.02<z<1, because these two subsamples are
relatively larger than the other subsamples in the Proctor sample. By
cross-matching these radio galaxies with the optical sources drawn
from the Sloan Digital Sky Survey (SDSS) database and counting the
SDSS sources with an r-band absolute magnitude brighter than -19
located within a 0.5Mpc distance around each source (i.e., the
richness), we find that the fraction of C-shaped sources with a
richness above 10 is larger than that of S-shaped sources. We have
also correlated the radio galaxies in our sample with the brightest
cluster galaxies (BCGs) defined in the NASA/IPAC Extragalactic
Database (NED), and infer that the C-shaped sources are more likely to
be BCGs than the S-shaped sources. These results support the idea that
C-shaped radio galaxies often reside in a richer environment than
radio galaxies with other morphological types.
Description:
We have selected C-shaped and S-shaped radio galaxies from the Proctor
sample and cross-matched them with SDSS sources. Then we calculated
the richness around each source to study differences in the
environment between C-shaped and S-shaped radio galaxies.