2018A&A...620A.117L

Query : 2018A&A...620A.117L

2018A&A...620A.117L - Astronomy and Astrophysics, volume 620A, 117-117 (2018/12-1)

The less significant role of large-scale environment than optical AGN in nearby, isolated elliptical galaxies.

LACERNA I., ARGUDO-FERNANDEZ M. and DUARTE PUERTAS S.

Abstract (from CDS):


Context. The formation and evolution of elliptical galaxies in low-density environments are less understood than classical elliptical galaxies in high-density environments. Isolated galaxies are defined as galaxies without massive neighbors within scales of galaxy groups. The effect of the environment at several Mpc scales on their properties has been barely explored. We study the role of the large-scale environment in 573 isolated elliptical galaxies out to z=0.08.
Aims. We aim to explore whether the large-scale environment affects some of the physical properties of the isolated galaxies studied in this work.
Methods. We used three environmental estimators of the large-scale structure within a projected radius of 5Mpc around isolated galaxies: the tidal strength parameter, projected density ηk,LSS, and distance to the fifth nearest neighbor galaxy. We studied isolated galaxies regarding stellar mass, integrated optical g-i color, specific star formation rate (sSFR), and emission lines.
Results. We find 80% of galaxies at lower densities correspond to "red and dead" elliptical galaxies. Blue and red galaxies do not tend to be located in different environments according to ηk,LSS. Almost all the isolated ellipticals in the densest large-scale environments are red or quenched, of which a third are low-mass galaxies. The percentage of isolated elliptical galaxies located in the active galactic nucleus (AGN) region of the BPT diagram is 64%. We identified 33 blue, star-forming (SF) isolated ellipticals using both color and sSFR. Half of these are SF nuclei in the BPT diagram, which amounts to 5% of the galaxies in this diagram.
Conclusions. The large-scale environment does not play the primary role in determining the color or sSFR of isolated elliptical galaxies. The large-scale environment seems to be negligible from a stellar mass scale around 1010.6M☉, probably because of the dominant presence of AGN at higher masses. For lower masses, the processes of cooling and infall of gas from large scales are very inefficient in ellipticals. Active galactic nuclei might also be an essential ingredient to keep most of the low-mass isolated elliptical galaxies quenched.

Abstract Copyright: © ESO 2018

Journal keyword(s): galaxies: active - galaxies: elliptical and lenticular, cD - galaxies: fundamental parameters - galaxies: photometry - galaxies: star formation

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 Coma Supercluster SCG 11 23 +23.9           ~ 270 0

Query : 2018A&A...620A.117L

Basic data :
NAME Coma Supercluster -- Supercluster of Galaxies
Origin of the objects types :

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    Grey values are increasing the original precision due to the computation of frame transformations
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  • quality : flag of quality
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    • D : 1-10" (and some old data)
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    • B : 0.01-0.1" + 2MASS, Tyc
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ICRS coord. (ep=J2000) : 		11 23 00.0 +23 54 00 [ ] E ~
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) : 		11 20 21.3 +24 10 28 [ ]
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) : 		217.1964 +69.8145 [ ]
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
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  • quality : flag of quality ( A=best quality -> E=worst quality, ∼=unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz : 		V(km/s) 6816 [~] / z(~) 0.023 [~] / cz 6895 [~]
   D 2011MNRAS.412.1098M
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NAME COMA SUPERCL NAME Coma-ABCG 1367 SCl 117 [KK95] 523
BSCG 10 NAME Coma Supercluster WSCG 27
NAME COMA-A 1367 SUPERCL NAME Coma/A1367 Supercluster [EET94] SCG 72

References (270 between 1850 and 2024) (Total 270)
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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