Early-type galaxies in the Antlia cluster: global properties

Autor: Juan Pablo Caso, Lilia Patricia Bassino, Matías Gómez, J. P. Calderón, Sergio A. Cellone
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Ciencias Astronómicas
DWARF GALAXIES
galaxies: clusters: individual: Antlia
dwarf [galaxies]
Population
FOS: Physical sciences
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Spatial distribution
01 natural sciences
GALAXY CLUSTER
STRUCTURAL PARAMETERS
purl.org/becyt/ford/1 [https]
Photometry (optics)
0103 physical sciences
clusters: general [galaxies]
fundamental parameters [galaxies]
Surface brightness
education
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
Dwarf galaxy
Physics
Effective radius
education.field_of_study
010308 nuclear & particles physics
Astronomy and Astrophysics
galaxies: fundamental parameters
purl.org/becyt/ford/1.3 [https]
galaxies: dwarf
Astrophysics - Astrophysics of Galaxies
Galaxy
Radial velocity
Space and Planetary Science
galaxies: clusters: general
Astrophysics of Galaxies (astro-ph.GA)
galaxies: elliptical and lenticular
cD

clusters: individual: Antlia [galaxies]
elliptical and lenticular
cD [galaxies]
Zdroj: SEDICI (UNLP)
Universidad Nacional de La Plata
instacron:UNLP
CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
Popis: We present an extension of our previous research on the early-type galaxy population of the Antlia cluster (d ~ 35 Mpc), achieving a total coverage of ~ 2.6 deg x deg and performing surface photometry for ~300 galaxies, 130 of which are new uncatalogued ones. Such new galaxies mainly fall in the low surface brightness (LSB) regime, but there are also some lenticulars (S0) which support the existence of unique functions that connect bright and dwarf galaxies in the scaling relations. We analyse the projected spatial distribution of galaxies up to a distance of ~800 kpc from NGC 3268, the adopted centre, as well as the radial velocity distribution and the correlation between galaxy colour and effective radius with the projected spatial distribution. We also obtain the luminosity function of the early-type galaxies and the distribution of stellar masses using the T1-band magnitudes and adopted mass-luminosity ratios. Additionally, we correlate the central galaxy distribution with an X-ray emission map from the literature. Based on the analysis of the radial velocities and galaxy colour distributions, we find that galaxies redder than the colour-magnitude relation (CMR) have a velocity distribution strongly concentrated towards the values of the dominant galaxies and are homogeneously distributed throughout the cluster. Those bluer than the CMR, in turn, have a much more extended radial velocity distribution and are concentrated towards the centre of the cluster. We also identify 12 candidates to ultra diffuse galaxies (UDG), that seem to be split into two families, and speculate about their origins in the context of the cluster structure.
Facultad de Ciencias Astronómicas y Geofísicas
Instituto de Astrofísica de La Plata
Consejo Nacional de Investigaciones Científicas y Técnicas
Databáze: OpenAIRE