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Article Dans Une Revue The Astrophysical Journal Année : 2023

Deep H I Mapping of Stephan's Quintet and Its Neighborhood

Cheng Cheng
  • Fonction : Auteur
Cong Kevin Xu
  • Fonction : Auteur
P. N. Appleton
  • Fonction : Auteur
P. -A. Duc
N. -Y. Tang
  • Fonction : Auteur
Y. -S. Dai
  • Fonction : Auteur
J. -S. Huang
  • Fonction : Auteur
U. Lisenfeld
  • Fonction : Auteur
F. Renaud
  • Fonction : Auteur
Chuan He
  • Fonction : Auteur
Hai-Cheng Feng
  • Fonction : Auteur

Résumé

We carried out deep mapping observations of the atomic hydrogen (H I) 21 cm line emission in a field centered on the famous galaxy group Stephan's Quintet (SQ), using the Five-hundred-meter Aperture Spherical Telescope (FAST) equipped with a 19-beam receiver. The final data cube reaches an H I column density sensitivity of 5σ = 2.1 × 1017 cm-2 per 20 km s-1 channel with an angular resolution of 4.'0. The discovery of a large diffuse feature of the H I emission in the outskirts of the intragroup medium of SQ was reported in a previous paper (Xu et al.). Here we present a new study of the total H I emission of SQ and the detection of several neighboring galaxies, exploiting the high sensitivity and the large sky coverage of the FAST observations. A total H I mass of M H I = 3.48 ± 0.35 × 1010 M is found for SQ, which is significantly higher than previous measurements in the literature. This indicates that, contrary to earlier claims, SQ is not H I deficient. The excessive H I gas is mainly found in the velocity ranges of 6200-6400 km s-1 and 6800-7000 km s-1, which were undetected in previous observations that are less sensitive than ours. Our results suggest that the "missing H I" in compact groups may be hidden in the low-density diffuse neutral gas instead of in the ionized gas.
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insu-04198342 , version 1 (07-09-2023)

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Cheng Cheng, Cong Kevin Xu, P. N. Appleton, P. -A. Duc, N. -Y. Tang, et al.. Deep H I Mapping of Stephan's Quintet and Its Neighborhood. The Astrophysical Journal, 2023, 954, ⟨10.3847/1538-4357/ace03e⟩. ⟨insu-04198342⟩
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