Early-type galaxies in the Antlia cluster: global properties

Author:

Calderón Juan P123ORCID,Bassino Lilia P123,Cellone Sergio A134,Gómez Matías5,Caso Juan P123ORCID

Affiliation:

1. Consejo Nacional de Investigaciones Científicas y Técnicas, Godoy Cruz 2290, C1425FQB, Ciudad Autónoma de Buenos Aires, Argentina

2. Instituto de Astrofísica de La Plata (CCT La Plata – CONICET - UNLP), Paseo del Bosque S/N, B1900FWA La Plata, Argentina

3. Facultad de Ciencias Astronómicas y Geofísicas de la Universidad Nacional de La Plata, Paseo del Bosque S/N, B1900FWA La Plata, Argentina

4. Complejo Astronómico El Leoncito (CONICET - UNLP - UNC - UNSJ), San Juan, Argentina

5. Departamento de Ciencias Físicas, Facultad de Ciencias Exactas, Universidad Andres Bello, Santiago, Chile

Abstract

ABSTRACT 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 deg2 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, which seem to be split into two families, and speculate about their origins in the context of the cluster structure.

Funder

Agencia Nacional de Promoción Científica y Tecnológica

Universidad Nacional de La Plata

National Science Foundation

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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