A catalogue sample of low mass galaxies observed in X-rays with central candidate black holes

A. A. Nucita; L. Manni; F. De Paolis; M. Giordano; G. Ingrosso

doi:10.3847/1538-4357/aa5f4f

paper

A catalogue sample of low mass galaxies observed in X-rays with central candidate black holes

arXiv:1704.03182 · doi:10.3847/1538-4357/aa5f4f

Abstract

We present a sample of $X$ -ray selected candidate black holes in 51 low mass galaxies with $z \leq 0.055$ {and mass up to $1 0^{10}$ M $_{⊙}$ } obtained by cross-correlating the NASA-SLOAN Atlas with the 3XMM catalogue. {We have also searched in the available catalogues for radio counterparts of the black hole candidates and find that 19 of the previously selected sources have also a radio counterpart.} Our results show that about $37%$ of the galaxies of our sample host { an $X$ -ray source} (associated to a radio counterpart) spatially coincident with the galaxy center, in agreement with { other recent works}. For these {\it nuclear} sources, the $X$ -ray/radio fundamental plane relation allows one to estimate the mass of the (central) candidate black holes which results to be in the range $1 0^{4} - 2 \times 1 0^{8}$ M $_{⊙}$ (with median value of $≃ 3 \times 1 0^{7}$ M $_{⊙}$ and eight candidates having mass below $1 0^{7}$ M $_{⊙}$ ). This result, while suggesting that $X$ -ray emitting black holes in low-mass galaxies may have had a key role in the evolution of such systems, makes even more urgent to explain how such massive objects formed in galaxies. {Of course, dedicated follow-up observations both in the $X$ -ray and radio bands, as well as in the optical, are necessary in order to confirm our results

15 Pages, 2 Figures, 3 Tables

A catalogue sample of low mass galaxies observed in X-rays with central candidate black holes

Abstract

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