AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 6. Interactions, Mergers and Starbursts
Display, Monday, May 31, 1999, 9:20am-6:30pm, Southwest Exhibit Hall

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[6.10] ROSAT High Resolution Imager Observations of the Composite Starburst/Seyfert~2 Galaxy NGC~1672

P.J. de Naray, W.N. Brandt (Penn State), J.P. Halpern (Columbia)

We present the results from a comparative study of two ROSAT High Resolution Imager (HRI) observations of the composite starburst/Seyfert~2 galaxy NGC~1672. This galaxy is known to show X-ray sources near the ends of its strong bar as well as extended X-ray emission near the nucleus. We have resolved one of the sources at an end of the bar into 2--3 components, and we find that the brightest of these appears to show significant variability on a timescale of \approx 4.5 years. This source is probably a highly luminous X-ray binary or the highly luminous remnant of a recent supernova. In addition, the improved photon statistics suggest the presence of large-scale diffuse X-ray emission that is probably associated with a hot interstellar medium. We also find evidence for several new, faint X-ray sources. New CTIO optical spectra of the nucleus of NGC~1672 are consistent with previous studies which revealed spatially resolved emission-line ratios consistent with a composite starburst/Seyfert~2 nature.

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