X-ray constraints on the intrinsic shape of the lenticular galaxy NGC 1332

Details X-ray constraints on the intrinsic shape of the lenticular galaxy NGC 1332 X-ray constraints on the intrinsic shape of the lenticular galaxy NGC 1332

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aipc..336..182b&link_type=abstract

Dark matter. AIP Conference Proceedings, Volume 336, pp. 182-185 (1995).

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Dark Matter, X-Ray, Lenticular Galaxies, Masses And Mass Distribution

Scientific paper

We have analyzed ROSAT PSPC X-ray data of the optically elongated S0 galaxy NGC 1332 with the purpose of constraining the intrinsic shape of its underlying mass. The X-ray isophotes are elongated with ellipticity 0.10-0.27 (90% confidence) for semi-major axes 75''-90'' and have orientations consistent with the optical isophotes (ellipticity ~0.43). Using (and clarifying) the geometric test for dark matter introduced by Buote & Canizares (1994), we determined that the hypothesis that mass-traces-light is not consistent with the X-ray data at 68% confidence and marginally consistent at 90% confidence independent of the temperature profile of the gas; similar results are obtained considering the effects of possible gas rotation and emission from discrete sources; these same constraints apply to MOND. Detailed modeling of the underlying mass distribution yield ɛmass=0.47-0.72(0.31-0.83) at 68% (90%) confidence for isothermal and polytropic models. Similar results are obtained when the dark matter is fit directly using the known distributions of the stars and gas. When possible rotation of the gas and emission from discrete sources are included the constraints on ɛmass are substantially weakened.

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