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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2022

A Chandra Virgo cluster survey of spiral galaxies – I. Introduction to the survey and a new ULX sample

Roberto Soria
Alister W. Graham
  • Fonction : Auteur
Douglas A. Swartz
  • Fonction : Auteur
Mihoko Yukita
  • Fonction : Auteur
Christian Motch
Thomas H. Jarrett
  • Fonction : Auteur
James C.A. Miller-Jones
  • Fonction : Auteur
Richard M. Plotkin
  • Fonction : Auteur
Thomas J. Maccarone
  • Fonction : Auteur
Laura Ferrarese
  • Fonction : Auteur
Alexander Guest
  • Fonction : Auteur

Résumé

We present an analysis of the ultraluminous X-ray source (ULX) population in 75 Virgo cluster late-type galaxies, including all those with a star formation rate ≳1 M_⊙ yr^−1 and a representative sample of the less star forming ones. This study is based on 110 observations obtained over 20 yr with the Chandra X-ray Observatory Advanced Camera for Imaging Spectroscopy. As part of a Large Chandra Program, new observations were obtained for 52 of these 75 galaxies. The data are complete to a sensitivity of ≈10^39 erg s^−1, with a typical detection limit of ≈3 × 10^38 erg s^−1 for the majority of the sources. The catalogue contains about 80 ULXs (0.3–10 keV luminosity >10^39 erg s^−1), and provides their location, observed flux, de-absorbed luminosity, and (for the 25 most luminous ones) simple X-ray spectral properties. We discuss the ULX luminosity function in relation to the mass and star formation rate of the sample galaxies. We show that recent models of low-mass plus high-mass X-ray binary populations (scaling with stellar mass and star formation rate, respectively) are mostly consistent with our observational results. We tentatively identify the most luminous X-ray source in the sample (a source in IC 3322A with L_X ≈ 6 × 10^40 erg s^−1) as a recent supernova or its young remnant. The properties of the sample galaxies (morphologies, stellar masses, star formation rates, total X-ray luminosities from their point-source population) are also summarized.
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hal-03557614 , version 1 (22-03-2023)

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Roberto Soria, Mari Kolehmainen, Alister W. Graham, Douglas A. Swartz, Mihoko Yukita, et al.. A Chandra Virgo cluster survey of spiral galaxies – I. Introduction to the survey and a new ULX sample. Monthly Notices of the Royal Astronomical Society, 2022, 512 (3), pp.3284-3311. ⟨10.1093/mnras/stac148⟩. ⟨hal-03557614⟩
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