RX J1003.6-2610 , the SIMBAD biblio

2000A&A...361..491K - Astronomy and Astrophysics, volume 361, 491-499 (2000/9-2)

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


Abstract (from CDS):

We 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 (1990AJ....100..648J) with the VLA. For 10 of these we can determine accurate hardness ratios δHR2≤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 candidates for 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 4.3x1020cm–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±75x1020cm–2. This value is slightly larger than the hydrogen column density derived from the 21-cm observations of ∼8x1020cm–2. We estimate that the molecular mass fraction of the gas is not larger than ∼60%.

Abstract Copyright:

Journal keyword(s): catalogs - galaxies: individual: NGC 3109 - galaxies: active - galaxies: ISM - radio continuum: galaxies - X-rays: galaxies

VizieR on-line data: <Available at CDS (J/A+A/361/491): table4.dat table6.dat notes.dat>

Nomenclature: Table 6, col(2): [KPP2000] NNN N=91 among (Nos 1-110). Table 4: [KPP2000] NN N N=30.

Simbad objects: 127

goto View the reference in ADS


© Université de Strasbourg/CNRS

    • Contact