Spectral properties of XRBs in dusty early-type galaxies

We present spectral properties of a total of 996 discrete X-ray sources resolved in a sample of 23 dusty early-type galaxies selected from different environments. The combined X-ray luminosity function of all the 996 sources within the optical D25D25 of the sample galaxies is well described by a broken power law with a break at 2.71 × 1038 erg s−1 and is close to the Eddington limit for a 1.4M⊙M⊙ neutron star. Out of the 996, about 63% of the sources have their X-ray luminosities in the range between few ×1037 to 2.0 × 1039 erg s−1 and are like normal LMXBs; about 15–20% with luminosities

► We present the spectral properties of 996 XRBs resolved within D25 region of D-ETGs.
► The cumulative XLF of the sources is well represented by a broken power law.
► X-ray color-color plot of the discrete sources enabled us to classify them in different types.
► The combined X-ray luminosity of resolved sources correlates with the star formation rate as well as Ks band luminosity of the target galaxies.
► Contribution of the XRBs to the total X-ray luminosity of the host galaxy is found to vary greatly for each galaxy.