Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.511..289s&link_type=abstract
Exploiting the ISO Data Archive. Infrared Astronomy in the Internet Age, held in Siguenza, Spain 24-27 June, 2002. Edited by
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The elliptical galaxy M86 (NGC 4406) shows a highly asymmetric X-ray morphology with an extended emission feature, which is likely due to ram pressure stripping of the hot coronal gas. A far-infrared (FIR) source detected by IRAS is offset from the galaxy centre in the same direction. On the basis of this apparent connection between the X-ray and far-infrared morphology, it has been proposed that not only gas but also dust is ram pressure stripped from M86 by the intracluster medium due the large relative velocity. Although elliptical galaxies have much less dust than spiral galaxies, M86 is nevertheless still the only case with some observational evidence for ongoing gas and dust stripping. ISOPHOT imaging of M86 at 60 μ m, 90 μ m, 150 μ m, and 180 μ m reveal a much more complex FIR morphology. A central pair of compact sources with a cold FIR spectrum of about 18 K dust temperature is closely associated with the M86 galaxy itself. A third unresolved source, previously discovered by IRAS, lies about 3.5 arcmin north-west of M86 and has in contrast a warm FIR spectrum. A fourth source with a cold FIR spectrum and a core-halo morphology lies about 7.5 arcmin north-west of M86, close to the nearby edge-on spiral NGC 4402. The ISOPHOT data do not support the interpretation that the north-western component is cold dust removed from M86, since it has a rather warm dust temperature of about 60 K, actually lies away from the ridge of the extended X-ray emission, and is positionally coincident with an optically faint unresolved point source, most likely an unrelated background source. Likewise, neither the central double source nor the fourth cold source lying between M86 and NGC 4402 provides support for the ram pressure dust stripping scenario. The former is likely due to the central FIR emission of M86 in conjunction with dust already seen in the optical. The latter likely part of the interstellar medium of NGC 4402 tidally removed during the passage of M86, and represents the first detection of a dust cloud in the intergalactic region between galaxies.
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