NDLI: Chandra observation of a group of galaxies hcg80: does the spiral-only group have hot intragroup gas? (2004).

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Chandra observation of a group of galaxies hcg80: does the spiral-only group have hot intragroup gas? (2004).

Content Provider	CiteSeerX
Author	Ota, Naomi Morita, Umeyo Kitayama, Tetsu Ohashi, Takaya
Abstract	We present an analysis of the Chandra X-ray observation of a compact group of galaxies HCG80 (z = 0.03). The system is a spiral-only group composed of four late-type galaxies and has a high velocity dispersion of 309 km s −1. With the high sensitivity Chandra observation, we searched for the diffuse X-ray emission from the intragroup medium (IGM), however, no significant emission was detected. We place a severe upper limit on the luminosity of the diffuse gas as LX < 6 × 10 40 erg s −1. On the other hand, significant emission from three of the four members were detected. In particular, we discovered a huge halo emission from HCG80a that extends on a scale of ∼ 30 kpc perpendicular to the galactic disk, whose X-ray temperature and luminosity are measured to be ∼ 0.6 keV and 5.6 × 10 40 erg s −1 in the 0.5–2 keV band, respectively. It is most likely to be an outflow powered by the intense starburst activity. Based on the results, we discuss possible reasons for the absence of diffuse X-ray emission in the HCG80 group, suggesting the system is subject to the galaxy interactions and possibly at the early stage of the IGM evolution.
File Format	PDF
Publisher Date	2004-01-01
Access Restriction	Open
Subject Keyword	Galaxy Hcg80 Chandra Observation Spiral-only Group Hot Intragroup Gas Diffuse X-ray Emission Significant Emission Hcg80 Group Possible Reason Severe Upper Limit Compact Group X-ray Temperature Igm Evolution Diffuse Gas Galaxy Interaction Kev Band Early Stage Intense Starburst Activity Spiral-only Group Late-type Galaxy Huge Halo Emission High Sensitivity Chandra Observation Intragroup Medium Galactic Disk High Velocity Dispersion Chandra X-ray Observation
Content Type	Text

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