Evolutionary link between ultra-diffuse galaxies and dwarf early-type galaxies. (arXiv:1910.04188v1 [astro-ph.GA])

Evolutionary link between ultra-diffuse galaxies and dwarf early-type galaxies. (arXiv:1910.04188v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Chilingarian_I/0/1/0/all/0/1">Igor V. Chilingarian</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Grishin_K/0/1/0/all/0/1">Kirill A. Grishin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Afanasiev_A/0/1/0/all/0/1">Anton V. Afanasiev</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fabricant_D/0/1/0/all/0/1">Daniel Fabricant</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Moran_S/0/1/0/all/0/1">Sean Moran</a>

Spectroscopic studies of low-luminosity early-type galaxies are essential to
understand their origin and evolution but remain challenging because of low
surface brightness levels. We describe an observational campaign with the new
high-throughput Binospec spectrograph at the 6.5-m MMT. It targets a
representative sample of dwarf elliptical (dE), ultra-diffuse (UDG), and dwarf
spheroidal (dSph) galaxies. We outline our data analysis approach that features
(i) a full spectrophotometric fitting to derive internal kinematics and star
formation histories of galaxies; (ii) two-dimensional light profile
decomposition; (iii) Jeans anisotropic modelling to assess their internal
dynamics and dark matter content. We present first results for 9 UDGs in the
Coma cluster and a nearby dSph galaxy, which suggest that a combination of
internal (supernovae feedback) and environmental (ram-pressure stripping,
interactions) processes can explain observed properties of UDGs and, therefore,
establish an evolutionary link between UDGs, dSph, and dE galaxies.

Spectroscopic studies of low-luminosity early-type galaxies are essential to
understand their origin and evolution but remain challenging because of low
surface brightness levels. We describe an observational campaign with the new
high-throughput Binospec spectrograph at the 6.5-m MMT. It targets a
representative sample of dwarf elliptical (dE), ultra-diffuse (UDG), and dwarf
spheroidal (dSph) galaxies. We outline our data analysis approach that features
(i) a full spectrophotometric fitting to derive internal kinematics and star
formation histories of galaxies; (ii) two-dimensional light profile
decomposition; (iii) Jeans anisotropic modelling to assess their internal
dynamics and dark matter content. We present first results for 9 UDGs in the
Coma cluster and a nearby dSph galaxy, which suggest that a combination of
internal (supernovae feedback) and environmental (ram-pressure stripping,
interactions) processes can explain observed properties of UDGs and, therefore,
establish an evolutionary link between UDGs, dSph, and dE galaxies.

http://arxiv.org/icons/sfx.gif

Comments are closed.