Dwarf galaxies in the nearby Lynx-Cancer void: photometry, colours and ages

(2) SAAO; (3) SFU; A. Kniazev (2); A. Tepliakova (1) ((1) SAO; Russia; Russia); South Africa; S. Pustilnik (1); Y. Lyamina (3)

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Dwarf galaxies in the nearby Lynx-Cancer void: photometry, colours and ages

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arxiv 1011.3430 v1 pith:CTLTWTXW submitted 2010-11-15 astro-ph.CO astro-ph.GA

S. Pustilnik (1) , A. Kniazev (2) , Y. Lyamina (3) , A. Tepliakova (1) ((1) SAO , Russia , (2) SAAO , South Africa , (3) SFU

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keywords voidgalaxieslynx-canceragesdwarffirstgoodnearby

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The nearby Lynx-Cancer void is a good laboratory to study the effect of very rarefied environment on the evolution of the least massive dwarf galaxies. A recently compiled sample of this void's galaxies includes about one hundred objects with M_B in the range -12 to -18 mag. Good quality images are available in the SDSS database for ~80% of the sample. Their u,g,r,i,z photometry allows one to derive galaxy stellar mass (and, incorporating HI data, gas mass-fraction) and ages of visible stellar populations, and hence, the epoch of their formation (first SF episode). We present the first photometric results of the ongoing study of the Lynx-Cancer void.

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