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Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2020

Newly discovered dwarf galaxies in the MATLAS low density fields

Rebecca Habas
Francine R. Marleau
  • Function : Author
Patrick R. Durrell
  • Function : Author
Sanjaya Paudel
Mélina Poulain
  • Function : Author
Sreevarsha Sreejith
  • Function : Author
Joanna Ramasawmy
  • Function : Author
Bryson Stemock
  • Function : Author
Christopher Leach
  • Function : Author
Stephen Gwyn
Adriano Agnello
Michal Bílek
Oliver Müller
Eric W. Peng
  • Function : Author

Abstract

We present the photometric properties of 2210 newly identified dwarf galaxy candidates in the MATLAS fields. The Mass Assembly of early Type gaLAxies with their fine Structures (MATLAS) deep imaging survey mapped ˜142 deg2 of the sky around nearby isolated early type galaxies using MegaCam on the Canada-France-Hawaii Telescope, reaching surface brightnesses of ˜ 28.5 - 29 in the g-band. The dwarf candidates were identified through a direct visual inspection of the images and by visually cleaning a sample selected using a partially automated approach, and were morphologically classified at the time of identification. Approximately 75% of our candidates are dEs, indicating that a large number of early type dwarfs also populate low density environments, and 23.2% are nucleated. Distances were determined for 13.5% of our sample using pre-existing zspec measurements and HI detections. We confirm the dwarf nature for 99% of this sub-sample based on a magnitude cut Mg = -18. Additionally, most of these (˜90%) have relative velocities suggesting that they form a satellite population around nearby massive galaxies rather than an isolated field sample. Assuming that the candidates over the whole survey are satellites of the nearby galaxies, we demonstrate that the MATLAS dwarfs follow the same scaling relations as dwarfs in the Local Group as well as the Virgo and Fornax clusters. We also find that the nucleated fraction increases with Mg, and find evidence of a morphology-density relation for dwarfs around isolated massive galaxies.
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hal-02390866 , version 1 (29-05-2024)

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Rebecca Habas, Francine R. Marleau, Pierre-Alain Duc, Patrick R. Durrell, Sanjaya Paudel, et al.. Newly discovered dwarf galaxies in the MATLAS low density fields. Monthly Notices of the Royal Astronomical Society, 2020, 491, pp.1901-1919. ⟨10.1093/mnras/stz3045⟩. ⟨hal-02390866⟩
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