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25 April 2024 |
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HSC-XD 52: An X-ray detected AGN in a low-mass galaxy at $zsim0.56$ | | Goni Halevi
; Andy Goulding
; Jenny Greene
; Jean Coupon
; Anneya Golob
; Stephen Gwyn
; Sean D. Johnson
; Thibaud Moutard
; Marcin Sawicki
; Hyewon Suh
; Yoshiki Toba
; | | Date: |
5 Oct 2019 | | Abstract: | The properties of low-mass galaxies hosting central black holes provide clues
about the formation and evolution of the progenitors of supermassive black
holes. In this letter, we present HSC-XD 52, a spectroscopically confirmed
low-mass active galactic nucleus (AGN) at an intermediate redshift of
$zsim0.56$. We detect this object as a very luminous X-ray source coincident
with a galaxy observed by the Hyper Suprime-Cam (HSC) as part of a broader
search for low-mass AGN. We constrain its stellar mass through spectral energy
distribution modeling to be LMC-like at $M_star approx 3 imes 10^9
M_odot$, placing it in the dwarf regime. We estimate a central black hole mass
of $M_mathrm{BH} sim 10^{6} M_odot$. With an average X-ray luminosity of
$L_X approx 3.5 imes 10^{43}~mathrm{erg}~mathrm{s}^{-1}$, HSC-XD 52 is
among the most luminous X-ray selected AGN in dwarf galaxies. The spectroscopic
and photometric properties of HSC-XD 52 indicate that it is an intermediate
redshift counterpart to local low-mass AGN. | | Source: | arXiv, 1910.2173 | | Services: | Forum | Review | PDF | Favorites | |
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