Anomalous HI Gas in NGC 4395: Signs of Gas Accretion
George Heald (1), Tom Oosterloo (1,2) ((1) ASTRON (2) Kapteyn, Astronomical Institute)
TL;DR
This paper reports deep HI observations of NGC 4395 revealing gas clouds that suggest ongoing gas accretion, which could influence galaxy evolution and star formation.
Contribution
It provides new observational evidence of gas clouds in NGC 4395's halo, indicating potential external gas accretion processes.
Findings
Detection of gas clouds similar to Milky Way HVCs
Some clouds located in regions without star formation
Evidence suggests ongoing gas accretion
Abstract
In recent years, it has become clear that large quantities of gas reside in the halos of many spiral galaxies. Whether the presence of this gas is ultimately a consequence of star formation activity in the disk, or accretion from outside of the galaxy, is not yet understood. We present new, deep HI observations of NGC 4395 as part of a continuing observational program to investigate this issue. We have detected a number of gas clouds with masses and sizes similar to Milky Way HVCs. Some of these are in regions without currently ongoing star formation, possibly indicating ongoing gas accretion.
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Astrophysics and Star Formation Studies · Phase Equilibria and Thermodynamics