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The Multicolored Hot Interstellar Medium of 'the Antennae' Galaxies (NGC 4038/4039)

Authors :
Arnold H. Rots
G. Fabbiano
Susan G. Neff
M. I. Krauss
Andreas Zezas
Source :
The Astrophysical Journal. 598:272-287
Publication Year :
2003
Publisher :
American Astronomical Society, 2003.

Abstract

We report the results of the analysis of the extended soft emission discovered in the Chandra ACIS pointing at the merging system NGC 4038/4039 ("the Antennae"). We present a multicolor X-ray image that suggests both extensive absorption by the dust in this system, peaking in the contact region, as well as variations in the temperature of different emitting regions of the hot interstellar medium (ISM). Spectral fits to multicomponent thermal emission models confirm this picture and give a first evaluation of the parameters of the hot plasma. We compare the diffuse X-ray emission with radio continuum (6 cm), H I, CO, and Hα images to take a first look at the multiphase ISM of "the Antennae" galaxies. We find that the hot (X-ray) and cold (CO) gas have comparable thermal pressures in the two nuclear regions. We also conclude that the displacement between the peak of the diffuse X-ray emission in the north of the galaxy system, toward the inner regions of the northern spiral arm (as defined by Hα, radio continuum, and H I), could result from ram pressure of infalling H I clouds.

Details

ISSN :
15384357 and 0004637X
Volume :
598
Database :
OpenAIRE
Journal :
The Astrophysical Journal
Accession number :
edsair.doi...........aff234bcd1a95d46de8065e73f1dbb37
Full Text :
https://doi.org/10.1086/378791