J/A+A/343/93 Local radio luminosity function of galaxies. II. (Gavazzi+ 1999)
On the local radio luminosity function of galaxies.
II: Environmental dependences among late-type galaxies
Gavazzi G., Boselli A.
<Astron. Astrophys. 343, 93 (1999)>
=1999A&A...343...93G 1999A&A...343...93G (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxies, radio ; Morphology
Keywords: galaxies: fundamental parameters; luminosity function -
radio continuum: galaxies - galaxies: interactions -
intergalactic medium - galaxies: clusters
Abstract:
Using new extensive radio continuum surveys at 1.4GHz (FIRST and
NVSS), we derive the distribution of the radio/optical and radio/NIR
luminosity (RLF) of late-type (Sa-Irr) galaxies (mp<15.7) in 5
nearby clusters of galaxies: A262, Cancer, A1367, Coma and Virgo. With
the aim of discussing possible environmental dependences of the radio
properties, we compare these results with those obtained for
relatively isolated objects in the Coma supercluster. We find that the
RLF of Cancer, A262 and Virgo are consistent with that of isolated
galaxies. Conversely we confirm earlier claims that galaxies in A1367
and Coma have their radio emissivity enhanced by a factor ∼5 with
respect to isolated objects. We discuss this result in the framework
of the dynamical pressure suffered by galaxies in motion through the
intra-cluster gas (ram-pressure). We find that the radio excess
is statistically larger for galaxies in fast transit motion. This is
coherent with the idea that enhanced radio continuum activity is
associated with magnetic field compression. The X-ray luminosities and
temperatures of Coma and A1367 imply that these two clusters have
significantly larger intracluster gas density than the remaining three
studied ones, providing a clue for explaining the higher radio
continuum luminosities of their galaxies. Multiple systems in the Coma
supercluster bridge (with projected separations smaller than 300kpc)
have radio luminosities significantly larger than isolated galaxies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 116 408 Parameters of the detected galaxies
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See also:
VII/4A : Abell and Zwicky Clusters of Galaxies (Abell+ 1974)
VII/190 : Zwicky Galaxy Catalog (Zwicky+ 1968)
VIII/48 : The FIRST Survey (White+ 1997)
J/A+A/343/86 : Local radio luminosity function of galaxies. I. (Gavazzi+ 1999)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Cluster Cluster name
9- 14 I6 --- CGCG CGCG denomination (Z FFF-NNN in Simbad)
(Zwicky et al., 1961-68, Cat. VII/190)
15 A1 --- m_CGCG [NWES] Multiplicity index on CGCG
17- 21 F5.2 mag Pmag Corrected photographic magnitude
23- 27 F5.2 mag Hmag ? Corrected H band magnitude
29- 35 A7 --- MType Morphological classification (VCC)
38- 42 A5 --- Agg Membership to the individual clusters
44- 45 I2 h RAh Optical right ascension (B1950)
47- 48 I2 min RAm Optical right ascension (B1950)
50- 54 F5.2 s RAs Optical right ascension (B1950)
56 A1 --- DE- Optical declination sign
57- 58 I2 deg DEd Optical declination (B1950)
60- 61 I2 arcmin DEm Optical declination (B1950)
63- 66 F4.1 arcsec DEs Optical declination (B1950)
68- 69 I2 h RArh Radio right ascension (B1950)
71- 72 I2 min RArm Radio right ascension (B1950)
74- 78 F5.2 s RArs Radio right ascension (B1950)
80 A1 --- DEr- Radio declination sign
81- 82 I2 deg DErd Radio declination (B1950)
84- 85 I2 arcmin DErm Radio declination (B1950)
87- 90 F4.1 arcsec DErs Radio declination (B1950)
92- 96 F5.2 arcsec R-Ooff radio-optical offset (arcsec)
98 I1 --- Class [1/4] Identification class (1)
100-105 F6.1 mJy S1.4GHz 1.4 GHz total flux density (mJy)
107-109 I3 arcsec Maj ? Radio source major axis (arcsec)
111-113 I3 arcsec Min ? Radio source minor axis (arcsec)
115-116 I2 --- r_S1.4GHz Reference to the 1.4 GHz data (2)
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Note (1): 1: pointlike radio sources with R≤3
2: extended sources not meeting the 3σ criterion
3: dubious identifications not meeting the 3σ criterion (not
used in the following analysis)
4: pointlike sources whose radio-optical offset is within the optical
extent of the galaxy
Note (2): References:
1: Jaffe & Gavazzi, 1986AJ.....91..204J 1986AJ.....91..204J
5: del Castillo et al., 1988AJ.....95.1340D 1988AJ.....95.1340D
6: Hummel, 1980A&AS...41..151H 1980A&AS...41..151H
7: Gioia & Fabbiano, 1987ApJS...63..771G 1987ApJS...63..771G
8: Condon, 1987ApJS...65..485C 1987ApJS...65..485C
13: Salpeter & Dickey, 1987, Cat. J/ApJ/317/102
16: Gavazzi & Contursi, 1994AJ....108...24G 1994AJ....108...24G
17: White et al., 1997, Cat. VIII/51 (FIRST)
18: Bravo-Alfaro, 1997, Ph.D. Thesis, University of Paris
19: Condon et al., 1998AJ....115.1693C 1998AJ....115.1693C (NVSS)
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Acknowledgements: Giuseppe Gavazzi
(End) Patricia Bauer [CDS] 06-Nov-1998