The Multi-Colored Hot Interstellar Medium of "The Antennae" Galaxies (NGC 4038/39)

Abstract

We report the results of the analysis of the extended soft emission discovered in the Chandra ACIS pointing at the merging system NGC 4038/39 (the Antennae). We present a `multi-color' 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 multi-component 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 (6cm), HI, CO, and H$\alpha$ images to take a first look at the multi-phase 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, towards the inner regions of the northern spiral arm (as defined by H$\alpha$, radio continuum and HI), could result from ram pressure of infalling HI clouds.

arXiv commentAccepted by ApJ

References in corpus (17)

• The Luminosity Function of Young Star Clusters In "The Antennae" Galaxies (NGC 4038/4039)
• Chandra X-Ray Observatory (CXO):Overview
• Chandra Observations of "The Antennae" Galaxies (NGC 4038/39)
• A Multi-Wavelength Study of the Young Star Clusters and Interstellar Medium in the Antennae Galaxies (NGC 4038/9)
• The X-ray Source Population of "The Antennae" Galaxies: X-ray Properties from Chandra and Multiwavelength Associations
• High-resolution HI Mapping of NGC 4038/9 ("The Antennae") and its Tidal Dwarf Galaxy Candidates
• High-Resolution Imaging of Molecular Gas and Dust in the Antennae (NGC 4038/39): Super Giant Molecular Complexes
• Chandra X-ray Observations of NGC 1316 (Fornax A)
• The X-ray Luminosity Function of "The Antennae" Galaxies (NGC4038/39) and the Nature of Ultra-Luminous X-ray Sources
• A Multi-Transistion CO Study of the "Antennae" Galaxies NGC4038/9
• Chandra Observations of "The Antennae" Galaxies (NGC 4038/39): II. Detection and Analysis of Galaxian X-ray source
• A Study of the Populations of X-ray Sources in the Small Magellanic Cloud with ASCA
• K-band Spectroscopy of Clusters in NGC 4038/4039
• New Measurement of Metal Abundance in the Elliptical Galaxy NGC 4636 with Asca
• An X-ray Mini-survey of Nearby Edge-on Starburst Galaxies II. The Question of Metal Abundance
• X-ray Arc Structures in Chandra Images of NGC5128 (Centaurus A)
• The X-ray properties of the merging galaxy pair NGC 4038/9 - the Antennae

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