SIMBAD references

2020ApJ...897...63D - Astrophys. J., 897, 63-63 (2020/July-1)

The warm-hot, extended, massive circumgalactic medium of NGC 3221: an XMM-Newton discovery.

DAS S., MATHUR S. and GUPTA A.

Abstract (from CDS):

Using Suzaku data, we had found a 3.4σ evidence for the X-ray emitting warm-hot circumgalactic medium (CGM) in the L* galaxy NGC 3221. Here we present XMM-Newton data and outline an efficient, rigorous, and well-defined method to extract the faint CGM signal. We confirm the CGM detection at 4σ significance within 30-200 kpc of the galaxy. We claim with 99.62% confidence that the CGM is extended beyond 150 kpc. The average temperature of the CGM is 2.0–0.3+0.2×106 K, but it is not isothermal. We find suggestive evidence for a declining temperature gradient out to 125 kpc and for supervirial temperature within 100 kpc. While a supervirial temperature component has been detected in the Milky Way CGM, this is the first time a temperature gradient has been observed in the warm-hot CGM of any spiral galaxy. The emission measure profile is well-fit with either a β-model or a constant-density profile. Deeper data are required to constrain the temperature and density profiles. We also confirm the Suzaku result that the warm-hot CGM is one of the most massive baryon components of NGC 3221 and can account for the missing galactic baryons.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Circumgalactic medium - Galaxy environments - Extragalactic astronomy - X-ray astronomy - Diffuse x-ray background - Diffuse radiation - Missing mass - Hot ionized medium

Simbad objects: 4

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2021.02.26-23:59:42

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