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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 731864.0, MPI für Astronomie / Publikationen_mpia
Faint dwarf galaxies in Hickson Compact Group 90
Authors:Ordenes-Briceño, Y.; Taylor, M. A.; Puzia, T. H.; Muñoz, R. P.; Eigenthaler, P.; Georgiev, I. Y.; Goudfrooij, P.; Hilker, M.; Lançon, A.; Mamon, G.; Mieske, S.; Miller, B. W.; Peng, E. W.; Sánchez-Janssen, R.
Date of Publication (YYYY-MM-DD):2016
Title of Journal:Monthly Notices of the Royal Astronomical Society
Issue / Number:2
Start Page:1284
End Page:1290
Audience:Not Specified
Abstract / Description: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 Very Large Telescope/Visible Multi-Object Spectrograph. 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 ≲ reff/kpc ≲ 1.5 with luminosities of -11.65 ≲ MU ≲ -9.42 and -12.79 ≲ MI ≲ -10.58 mag, corresponding to a colour range of (U - I)0 ≃ 1.1-2.2 mag and surface brightness levels of μU ≃ 28.1 mag arcsec-2 and μI ≃ 27.4 mag arcsec-2. Their colours and luminosities are consistent with a diverse set of stellar population properties. Assuming solar and 0.02 Z metallicities we obtain stellar masses in the range M*|Z ≃ 105.7 - 6.3 M and M_{ast }|_{0.02 Z_{⊙}} ˜eq 10^{6.3-8} M_{{⊙}}. Three dwarfs are older than 1 Gyr, while the other two significantly bluer dwarfs are younger than ˜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 ˜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 reff ≃ 46-63 pc and magnitude MU, 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 104.9 - 6.5 M.
Free Keywords:galaxies: dwarf; galaxies: elliptical and lenticular; cD; galaxies: groups: individual: HCG 90; galaxies: nuclei; galaxies: spiral
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0035-8711 %R 10.1093/mnras/stw2066
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