2015A&A...576A.101M

Query : 2015A&A...576A.101M

2015A&A...576A.101M - Astronomy and Astrophysics, volume 576A, 101-101 (2015/4-1)

The environment of radio sources in the VLA-COSMOS survey field.

MALAVASI N., BARDELLI S., CILIEGI P., ILBERT O., POZZETTI L. and ZUCCA E.

Abstract (from CDS):

Several problems with the process of galaxy formation are still open. One of them is the role played by active galactic nuclei (AGNs) phenomena in galaxy build-up and, in particular, in quenching star formation (SF). On the other hand, the theory of AGN formation predicts that these phenomena are correlated with the host-galaxy environment, therefore opening links among SF quenching, environment and AGN phenomena in galaxy formation, and the evolution paradigm. This work focuses on the correlations among environmental density, radio AGN presence and the probability that a galaxy hosts a radio AGN. Using data from the photometric COSMOS survey and its radio 1.4GHz follow-up (VLA-COSMOS), a sample of radio AGNs has been defined. The environment was studied using the richness distributions inside a parallelepiped with base side of 1 Mpc and height proportional to the photometric redshift precision. Richness distributions were compared as a function of both the redshift and the relative evolution of the stellar masses of galaxies and AGN hosts up to z=2. Radio AGNs are always located in environments that are significantly richer and denser than those around galaxies in which radio emission is absent, so the environment seems to enhance the probability of a galaxy hosting a radio AGN. Moreover, a distinction between high-power and low-power radio AGNs leads to the conclusion that the significance of the environmental effect is only maintained for low-power radio sources. By studying the evolution of stellar masses, it is possible to conclude that radio AGN presence is a phenomenon related to quiescent galaxies up to z=2, with a significant increase in the fraction of quiescent galaxies hosting a radio AGN with decreasing redshift. Hints of an environmental effect are present as well. The results found with this work lead to concluding that denser environments play a significant role in enhancing the probability that a galaxy hosts a radio AGN and, in particular, low-power ones.

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Journal keyword(s): galaxies: active - galaxies: evolution - galaxies: formation - galaxies: clusters: general - galaxies: star formation - galaxies: luminosity function, mass function

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2975 0

Query : 2015A&A...576A.101M

Basic data :
NAME COSMOS Field -- Region defined in the Sky
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types: 		reg ()
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) : 		10 00 28.60 +02 12 21.0 [ ] D 2007ApJS..172..523M
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) : 		09 57 53.49 +02 26 47.1 [ ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) : 		236.82224 +42.12163 [ ]
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', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay Simbad points in this preview
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NAME COSMOS Field

References (2975 between 1850 and 2024) (Total 2975)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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