3D-structure of the Canes Venatici I Cloud

TL;DR

This paper refines the 3D structure of the Canes Venatici I Cloud by applying an improved TRGB method to HST data, revealing its core and outskirts, and estimating its mass and mass-to-light ratio.

Contribution

It introduces an enhanced distance measurement technique for faint galaxies, enabling detailed mapping of the Canes Venatici I Cloud's 3D structure.

Findings

The Cloud consists of a central group around M94 and an outer gravitationally bound region.

Refined distances clarify the spatial arrangement of member galaxies.

Estimated the total mass and mass-to-light ratio of the Cloud.

Abstract

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.