Early-type galaxies in the Antlia cluster: global properties
Autor: | Juan Pablo Caso, Lilia Patricia Bassino, Matías Gómez, J. P. Calderón, Sergio A. Cellone |
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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 |
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