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The Leo-I group: new dwarf galaxy and ultra diffuse galaxy candidates

Müller, Oliver and Jerjen, Helmut and Binggeli, Bruno. (2018) The Leo-I group: new dwarf galaxy and ultra diffuse galaxy candidates. Astronomy and Astrophysics, 615. A105.

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Official URL: https://edoc.unibas.ch/67592/

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Abstract

The study of dwarf galaxies and their environments provides crucial testbeds for predictions of cosmological models and insights on the structure formation on small cosmological scales. In recent years, many problems on the scale of groups of galaxies challenged the current standard model of cosmology. We aim to increase the sample of known galaxies in the Leo-I group, containing the M,96 subgroup and the Leo Triplet. This galaxy aggregate is located at the edge of the Local Volume at a mean distance of 10.7 Mpc. We employ image enhancing techniques to search for low-surface brightness objects in publicly available gr images taken by the Sloan Digital Sky Survey within 500 square degrees around the Leo-I group. Once detected, we perform surface photometry and compare their structural parameters to other known dwarf galaxies in the nearby universe. We found 36 new dwarf galaxy candidates within the search area. Their morphology and structural parameters resemble known dwarfs in other groups. Among the candidates 5 to 6 galaxies are considered as ultra diffuse galaxies candidates. If confirmed, they would be some of the closest examples of this galaxy type. We assessed the luminosity function of the Leo-I group and find it to be considerably rich in dwarf galaxies, with twice the number of galaxies as the Local Group at a limiting magnitude of M_V=-10 and a steeper faint-end slope.
Faculties and Departments:05 Faculty of Science > Departement Physik
UniBasel Contributors:Binggeli, Bruno and Müller, Oliver
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:EDP Sciences
ISSN:0004-6361
e-ISSN:1432-0746
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
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Last Modified:09 Apr 2019 09:56
Deposited On:09 Apr 2019 09:56

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