Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...18912017h&link_type=abstract
American Astronomical Society, 189th AAS Meeting, late abstracts, #120.17; Bulletin of the American Astronomical, Vol. 29, p. 73
Astronomy and Astrophysics
Astronomy
Scientific paper
We have secured ROSAT HRI X-ray images, totalling 55 ksecs exposure, of NGC 5291, an HI-rich early-type interacting spiral in the west of the IC 4329 cluster. It is flanked by ~ 100 kpc N-S complexes of LMC-sized HII regions, the largest of which may well be bound, "young" galaxies in their own right. The explanation of these complexes is controversial. Longmore et al. 1979 (MNRAS, 188, 285) suggest ram-sweeping of an extended HI disk as the galaxy falls into the intracluster medium (ICM) from the west. Indeed a low-S/N X-ray image from the Einstein IPC shows N-S extensions and a westward ("downstream") tail, possibly consistent with this picture. VLA HI images by Malphrus et al. 1994, 1995 (BAAS,185,7709; 187,5102) show much HI associated with the HII complexes, at least one of which is quite massive enough to be bound against its own kinematics. However a 200 kpc loop of HI gas to the west suggests instead that the interaction is the dominant process. In ram-sweeping X-ray emission should be seen from ICM upstream of the HI and being heated and compressed. Smoothed ROSAT images confirm the presence of extended structure associated with NGC 5291 (itself, and its companion, semi-resolved sources). Even with overlying (variable) point sources removed, the "tail" seen by Einstein remains apparent on the ROSAT images. Also, X-ray emission is indeed seen just "upstream" of the northern HI concentrations, as expected from ram-sweeping. However to the south very little extended X-ray emission occurs near the HI and HII features, despite their general N-S symmetry. At the present level of analysis the controversy about this system must evidently remain.
Chaytor D. H.
Hawarden Tim G.
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