RXTE studies of the starburst galaxies M82 and NGC253

Mathematics – Logic

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Starburst Galaxies And Infrared Excess Galaxies, Irregular And Morphologically Peculiar Galaxies, Spiral Galaxies, X-Ray Sources, X-Ray Bursts, Galactic Nuclei, Circumnuclear Matter, And Bulges

Scientific paper

The two nearby starburst (SB) galaxies M82 and NGC253 were observed for ~100 ksec over a 10-month period in 1997. While the NGC253 flux did not vary significantly, the M82 flux jumped by a factor ~2 in July to a total luminosity of 4×1040 erg s-1. The earlier emission from M82 has a thermal shape with kT~=6.63+/-0.08. In the high flux phase, the additional emission requires either an absorbed second thermal component, or absorbed power law component, with the former providing a better fit. But given the unphysically weak Fe K emission if thermal, nonthermal power law emission is more likely. M82 could therefore be a combined SB/LLAGN, with the dominant emission powered by the SB activity. The best-fit emission from NGC253 if thermal has kT=4.2+/-0.4 keV or index 2.6+/-0.1 if power law. .

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