3D-structure of the Canes Venatici I Cloud

Details 3D-structure of the Canes Venatici I Cloud 3D-structure of the Canes Venatici I Cloud

2009-12-24

arxiv.org/abs/0912.4799v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

4 pages, 3 figures, 2 table. Published in YSC'16 Proc. of Contributed Papers (eds. Choliy V.Ya., Ivashchenko G.); YSC'16 Proc.

Scientific paper

We present the improved distance moduli of 30 galaxies in the Canes Venatici I Cloud using advanced Tip of Red Giant Branch (TRGB) method (Makarov et.al. 2006). The method was determined for accurate estimation of the distances even if TRGB situated near photometric limit. The data were taken from the Archive of the Hubble Space Telescope (HST). Based on ACS and WFPC2 images of the HST we construct the color-magnitude diagrams of the resolved stellar population of the galaxies using Dolphot and HSTPhot packages. New refined method of the distance determination allows us to clarify the 3D structure of the Canes Venatici I Cloud. It consists of the central group of galaxies around M94 and the outskirt which is situated in gravitational field of the "core". The mass and mass-to-light ratio of the CVn have been estimated.

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