Searching for Nearby Diffuse Dwarf Galaxies in the COSMOS Field
Dongdong Shi (AUST), XianZhong Zheng (SJTU), Zhizheng Pan (PMO), Yu, Luo (HNNU), Hongxia Deng (AUST), Qunzhi Hua (AUST), Xinyu Luo (AUST) and, Qiming Wu (AUST)

TL;DR
This study identifies and characterizes three diffuse dwarf galaxies in the COSMOS field using deep HST imaging, revealing their properties and potential evolutionary states, and contributing to understanding nearby dwarf galaxy populations.
Contribution
First systematic search for nearby diffuse dwarf galaxies in COSMOS using HST data, with detailed property analysis and implications for galaxy formation.
Findings
Three diffuse dwarf galaxies identified with specific criteria.
COSMOS-dw1 is a nascent, dark matter-dominated galaxy with neutral hydrogen gas.
The galaxies follow the local dwarf galaxy mass-metallicity relation.
Abstract
It remains challenging to systematically survey nearby diffuse dwarf galaxies and address the formation mechanism of this population distinguishing from regular ones. We carry out a pilot search for these galaxies in the COSMOS field using the deep \textit{HST}/F814W imaging data. We report three diffuse dwarf galaxies satisfying the criteria: (1) redshift , (2) effective radius , and (3) central surface brightness mag arcsec. Two of the three galaxies, COSMOS-UDG1 and COSMOS-UDG2, are recognized as ultra-diffuse galaxies (UDGs) with redshift and , respectively. The third galaxy, COSMOS-dw1, is spectroscopically confirmed as a dwarf galaxy at . We derive the physical properties through fitting their spectral energy distributions (SEDs) extracted from deep multiwavelength observations. COSMOS-dw1 has a stellar mass…
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Taxonomy
TopicsAstronomy and Astrophysical Research · Stellar, planetary, and galactic studies · Galaxies: Formation, Evolution, Phenomena
