HSC-XD 52: An X-Ray detected AGN in a low-mass Galaxy at z ∼ 0.56

Goni Halevi, Andy Goulding, Jenny Greene, Jean Coupon, Anneya Golob, Stephen Gwyn, Sean D. Johnson, Thibaud Moutard, Marcin Sawicki, Hyewon Suh, Yoshiki Toba

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6 Scopus citations


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 z ∼ 0.56. 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 ≈ 3 109 M o˙, placing it in the dwarf regime. We estimate a central black hole mass of M BH ∼ 106 M o˙. With an average X-ray luminosity of, 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.

Original languageEnglish (US)
Article numberL3
JournalAstrophysical Journal Letters
Issue number1
StatePublished - Nov 1 2019

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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