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26 April 2024 |
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Faint Dwarf Galaxies in Hickson Compact Group 90 | | Yasna Ordenes-Briceño
; Matthew A. Taylor
; Thomas H. Puzia
; Roberto P. Muñoz
; Paul Eigenthaler
; Iskren Y. Georgiev
; Paul Goudfrooij
; Michael Hilker
; Ariane Lançon
; Gary Mamon
; Steffen Mieske
; Bryan W. Miller
; Eric W. Peng
; Rubén Sánchez-Janssen
; | | Date: |
17 Aug 2016 | | Abstract: | We report the discovery of a very diverse set of five low-surface brightness
(LSB) dwarf galaxy candidates in Hickson Compact Group 90 (HCG 90) detected in
deep U- and I-band images obtained with VLT/VIMOS. These are the first LSB
dwarf galaxy candidates found in a compact group of galaxies. We measure
spheroid half-light radii in the range $0.7!lesssim! r_{
m eff}/{
m kpc}!
lesssim! 1.5$ with luminosities of $-11.65!lesssim! M_U! lesssim!
-9.42$ and $-12.79!lesssim! M_I! lesssim! -10.58$ mag, corresponding to a
color range of $(U!-!I)_0!simeq!1.1!-!2.2$ mag and surface brightness
levels of $mu_U!simeq!28.1,{
m mag/arcsec^2}$ and
$mu_I!simeq!27.4,{
m mag/arcsec^2}$. Their colours and luminosities are
consistent with a diverse set of stellar population properties. Assuming solar
and 0.02 Z$_odot$ metallicities we obtain stellar masses in the range
$M_*|_{Z_odot} simeq 10^{5.7-6.3} M_{odot}$ and
$M_*|_{0.02,Z_odot}!simeq!10^{6.3-8},M_{odot}$. Three dwarfs are older
than 1 Gyr, while the other two significantly bluer dwarfs are younger than
$sim 2$ Gyr at any mass/metallicity combination. Altogether, the new LSB dwarf
galaxy candidates share properties with dwarf galaxies found throughout the
Local Volume and in nearby galaxy clusters such as Fornax. We find a pair of
candidates with $sim!2$ kpc projected separation, which may represent one of
the closest dwarf galaxy pairs found. We also find a nucleated dwarf candidate,
with a nucleus size of $r_{
m eff}!simeq!46!-!63$ pc and magnitude
M$_{U,0}=-7.42$ mag and $(U!-!I)_0!=!1.51$ mag, which is consistent with a
nuclear stellar disc with a stellar mass in the range $10^{4.9-6.5},M_odot$. | | Source: | arXiv, 1608.5082 | | Services: | Forum | Review | PDF | Favorites | |
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