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26 April 2024 |
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Photometric properties of Local Volume dwarf galaxies | | M. E. Sharina
; I. D. Karachentsev
; A. E. Dolphin
; V. E. Karachentseva
; R. Brent Tully
; G. M. Karataeva
; D. I. Makarov
; L. N. Makarova
; S. Sakai
; E. J. Shaya
; E. Yu. Nikolaev
; A. N. Kuznetsov
; | | Date: |
7 Dec 2007 | | Abstract: | We present surface photometry and metallicity measurements for 104 nearby
dwarf galaxies imaged with the Advanced Camera for Surveys and Wide Field and
Planetary Camera 2 aboard the Hubble Space Telescope.
In addition, we carried out photometry for 26 galaxies of the sample and for
Sextans B on images of the Sloan Digital Sky Survey. Our sample comprises dwarf
spheroidal, irregular and transition type galaxies located within ~10 Mpc in
the field and in nearby groups: M81, Centaurus A, Sculptor, and Canes Venatici
I cloud. It is found that the early-type galaxies have on average higher
metallicity at a given luminosity in comparison to the late-type objects. Dwarf
galaxies with M_B > -12 -- -13 mag deviate toward larger scale lengths from the
scale length -- luminosity relation common for spiral galaxies, h propto
L^{0.5}_B. The following correlations between fundamental parameters of the
galaxies are consistent with expectations if there is pronounced gas-loss
through galactic winds: 1) between the luminosity of early-type dwarf galaxies
and the mean metallicity of constituent red giant branch stars, Z ~ L^0.4, 2)
between mean surface brightness within the 25 mag/sq.arcsec isophote and the
corresponding absolute magnitude in the V and I bands, SB_25 ~ 0.3 M_25, and 3)
between the central surface brightness (or effective surface brightness) and
integrated absolute magnitude of galaxies in the V and I bands, SB_0 ~ 0.5 M_L,
SB_e ~ 0.5 M_e. The knowledge of basic photometric parameters for a large
sample of dwarf galaxies is essential for a better understanding of their
evolution. | | Source: | arXiv, 0712.1226 | | Services: | Forum | Review | PDF | Favorites | |
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