ROSAT observations of the X-ray halo around GX339 - 4

Details ROSAT observations of the X-ray halo around GX339 - 4 ROSAT observations of the X-ray halo around GX339 - 4

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...246l..40p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 246, no. 1, June 1991, p. L40-L43.

Astronomy and Astrophysics

Astronomy

36

Cosmic Dust, Halos, Rosat Mission, X Ray Sources, Brightness Distribution, Grain Size, Sky Surveys (Astronomy)

Scientific paper

A systematic investigation is discussed of X-ray haloes around bright galactic sources observed during the Rosat All-Sky Survey. The halo around the galactic center source GX339 - 4 is discussed. Both the Mathis-Rumpl-Nordsiek (MRN) as well as the Oort-van der Hulst (OHV) grain-size distributions allow acceptable fits to the data but only under the assumption of an inhomogeneous grain distribution along the line of sight. The spatial dust concentration found is in excellent agreement with galactic dust-cloud models derived from optical extinction measurements. Grains with sizes between 0.04 micron and 0.25 micron (MRN) or 0.04 micron and 0.6 micron (OHV), respectively, produce the correct halo shape. The fractional halo intensity of 9.9 percent at 1.1 keV is consistent with that found in previous investigations and leads to grain column density of about 4.8 x 10 to the 9th/sq cm.

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