Probing the gas content of the dwarf galaxy NGC 3109 with background X-ray sources

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dc.creatorKahabka, P.
dc.creatorPuzia, T. H.
dc.creatorPietsch, W.
dc.date2000-05-24
dc.date.accessioned2026-07-07T01:53:44Z
dc.date.available2026-07-07T01:53:44Z
dc.descriptionWe established the catalog of X-ray point sources in the field of the Magellanic-type spiral galaxy NGC 3109 (DDO 236) from two ROSAT PSPC observations. Of the 91 X-ray sources 26 are contained within the HI extent of NGC 3109 as derived by Jobin & Carignan (1990) with the VLA. For 10 of these we can determine accurate hardness ratios delta HR2<=0.2. We find 3 candidate AGN, 2 candidate X-ray binaries and one source which may belong to either class. We also find 2 candidate foreground stars. In a field of 8'x8' observed with the NTT in the I-band and centered on the nucleus of NGC 3109 we determine candidate optical counterparts in the X-ray error circle of 7 ROSAT PSPC sources. We apply a spectral fit to the ROSAT spectrum of the X-ray brightest absorbed candidate AGN behind NGC 3109, RX J1003.2-2607. Assuming a galactic foreground hydrogen column density of 4.3 10^20 cm^-2 we derive from the X-ray spectral fit, assuming reduced metallicities (~0.2 solar), a hydrogen column density due to NGC 3109 of 11(+7,-5) 10^20 cm^-2. This value is slightly larger than the hydrogen column density derived from the 21-cm observations of ~8 10^20 cm^-2. We estimate that the molecular mass fraction of the gas is not larger than ~60%.
dc.description10 pages, accepted by A&A May 23rd 2000
dc.identifierhttps://arxiv.org/abs/astro-ph/0005482
dc.identifierhttp://arxiv.org/abs/astro-ph/0005482
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/1072
dc.subjectAstrophysics
dc.titleProbing the gas content of the dwarf galaxy NGC 3109 with background X-ray sources
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