TY - JOUR

T1 - Newly discovered dwarf galaxies in the MATLAS low-density fields

AU - Habas, Rebecca

AU - Marleau, Francine R.

AU - Duc, Pierre-Alain

AU - Durrell, Patrick R.

AU - Paudel, Sanjaya

AU - Poulain, Melina

AU - Sanchez-Janssen, Ruben

AU - Sreejith, Sreevarsha

AU - Ramasawmy, Joanna

AU - Stemock, Bryson

AU - Leach, Christopher

AU - Cuillandre, Jean-Charles

AU - Gwyn, Stephen

AU - Agnello, Adriano

AU - Bilek, Michal

AU - Fensch, Jeremy

AU - Muller, Oliver

AU - Peng, Eric W.

AU - van der Burg, Remco F. J.

PY - 2020/1

Y1 - 2020/1

N2 - 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.

AB - 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.

KW - galaxies: dwarf

KW - galaxies: fundamental parameters

KW - galaxies: photometry

KW - galaxies: structure

KW - SURFACE BRIGHTNESS GALAXIES

KW - ULTRA-DIFFUSE GALAXIES

KW - DIGITAL SKY SURVEY

KW - VIRGO CLUSTER

KW - DARK-MATTER

KW - LUMINOSITY FUNCTION

KW - STAR-FORMATION

KW - ATLAS(3D) PROJECT

KW - SPIRAL GALAXIES

KW - LOCAL UNIVERSE

U2 - 10.1093/mnras/stz3045

DO - 10.1093/mnras/stz3045

M3 - Journal article

VL - 491

SP - 1901

EP - 1919

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

SN - 0035-8711

IS - 2

ER -