ASCA observations of `the Antennae'

Details ASCA observations of `the Antennae' ASCA observations of `the Antennae'

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.281...48s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 281, Issue 1, pp. 48-58.

Astronomy and Astrophysics

Astronomy

19

Galaxies: Individual: Ngc 4038/9, Galaxies: Interactions, X-Rays: Galaxies

Scientific paper

We analyse X-ray data from the ASCA satellite for the galaxies NGC 4038/9 (also known as `the Antennae'), and find emission from both galaxies. At least two spectral components are required to describe the overall emission from these galaxies: thermal emission from a plasma at 0.8 keV, and a component at higher energies. The hot gas contributes about half of the flux in the 0.5-to 6-keV band. If the column density to the higher energy component is <~2x10^21 cm^-2 then the fitted abundance in the hot gas component is less than 0.2 times solar. This low abundance is not expected for the hot interstellar medium in NGC 4038/9 in which supernovae and star formation (expected to enrich and heat the gas) are ongoing. We do not detect any spatial variations in the spectrum. We relate these findings to data obtained by other X-ray satellites (Einstein, ROSAT) for this interacting galaxy pair.

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