2024ApJ...961..249H -
Astrophys. J., 961, 249 (2024/February-1)
X-Ray Constraints on the Hot Gaseous Corona of Edge-on Late-type Galaxies in Virgo.
HOU M., HE L., HU Z., LI Z., JONES C., FORMAN W., SU Y., WANG J. and HO L.C.
Abstract (from CDS):
We present a systematic study of the putative hot gas corona around late-type galaxies (LTGs) residing in the Virgo cluster, based on archival Chandra observations. Our sample consists of 21 nearly edge-on galaxies representing a range of star formation rate (SFR) of 0.2-3 M⊙ yr–1 and a range of stellar mass (M*) of (0.2-10) × 1010M⊙, the majority of which have not been explored with high-sensitivity X-ray observations so far. Significant extraplanar diffuse X-ray (0.5-2 keV) emission is detected in only three LTGs, which are also the three galaxies with the highest SFR. A stacking analysis is performed for the remaining galaxies without individual detection, dividing the whole sample into two subsets based on SFR, stellar mass, or specific SFR. Only the high-SFR bin yields a significant detection, which has a value of LX ∼ 3 × 1038 erg s–1 per galaxy. The stacked extraplanar X-ray signals of the Virgo LTGs are consistent with the empirical LX-SFR and LX-M* relations found among highly inclined disk galaxies in the field, but appear to be systematically lower than those of a comparison sample of simulated star-forming galaxies in clusters identified from the Illustris-TNG100 simulation. The apparent paucity of hot gas coronae in the sampled Virgo LTGs might be understood as the net outcome of the long-lasting effect of ram pressure stripping exerted by the hot intracluster medium and in-disk star-forming activity acting on shorter timescales. A better understanding of the roles of environmental effects in regulating the hot gas content of cluster galaxies invites sensitive X-ray observations for a large sample of galaxies.
Abstract Copyright:
© 2024. The Author(s). Published by the American Astronomical Society.
Journal keyword(s):
Virgo Cluster - X-ray astronomy - Late-type galaxies - Disk galaxies - Circumgalactic medium
Simbad objects:
45
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