Newly discovered dwarf galaxies in the MATLAS low-density fields

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  • stz3045

    Final published version, 5.67 MB, PDF document

  • Rebecca Habas
  • Francine R. Marleau
  • Pierre-Alain Duc
  • Patrick R. Durrell
  • Sanjaya Paudel
  • Melina Poulain
  • Ruben Sanchez-Janssen
  • Sreevarsha Sreejith
  • Joanna Ramasawmy
  • Bryson Stemock
  • Christopher Leach
  • Jean-Charles Cuillandre
  • Stephen Gwyn
  • Agnello, Adriano
  • Michal Bilek
  • Jeremy Fensch
  • Oliver Muller
  • Eric W. Peng
  • Remco F. J. van der Burg

We present the photometric properties of 2210 newly identified dwarf galaxy candidates in the Mass Assembly of early Type gaLAxies with their fine Structures (MATLAS) fields. The MATLAS deep imaging survey mapped similar to 142 deg(2) of the sky around nearby isolated early type galaxies using MegaCam on the Canada-France-Hawaii Telescope, reaching surface brightnesses of similar to 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 per cent of our candidates are dEs, indicating that a large number of early type dwarfs also populate low-density environments, and 23.2 per cent are nucleated. Distances were determined for 13.5 per cent of our sample using pre-existing z(spec) measurements and HI detections. We confirm the dwarf nature for 99 per cent of this sub-sample based on a magnitude cut M-g = -18. Additionally, most of these (similar to 90 per cent) 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 M-g, and evidence of a morphology-density relation for dwarfs around isolated massive galaxies.

Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Volume491
Issue number2
Pages (from-to)1901-1919
Number of pages19
ISSN0035-8711
DOIs
Publication statusPublished - Jan 2020

    Research areas

  • galaxies: dwarf, galaxies: fundamental parameters, galaxies: photometry, galaxies: structure, SURFACE BRIGHTNESS GALAXIES, ULTRA-DIFFUSE GALAXIES, DIGITAL SKY SURVEY, VIRGO CLUSTER, DARK-MATTER, LUMINOSITY FUNCTION, STAR-FORMATION, ATLAS(3D) PROJECT, SPIRAL GALAXIES, LOCAL UNIVERSE

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