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Deep H i Mapping of...
Deep H i Mapping of Stephan's Quintet and Its Neighborhood
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- Cheng, Cheng (author)
- National Astronomical Observatories, Chinese Academy of Sciences
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- Xu, Cong Kevin (author)
- National Astronomical Observatories, Chinese Academy of Sciences
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- Appleton, P. N. (author)
- California Institute of Technology
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- Duc, P. A. (author)
- Observatory of Strasbourg
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- Tang, N. Y. (author)
- University of Massachusetts
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- Dai, Y. S. (author)
- National Astronomical Observatories, Chinese Academy of Sciences
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- Huang, J. S. (author)
- Harvard–Smithsonian Center for Astrophysics,National Astronomical Observatories, Chinese Academy of Sciences
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- Lisenfeld, U. (author)
- University of Granada
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- Renaud, F. (author)
- Lund University,Lunds universitet,Astrofysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Astrophysics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
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- He, Chuan (author)
- National Astronomical Observatories, Chinese Academy of Sciences
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- Feng, Hai Cheng (author)
- University of the Chinese Academy of Sciences
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(creator_code:org_t)
- 2023
- 2023
- English.
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In: Astrophysical Journal. - 0004-637X. ; 954:1
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http://dx.doi.org/10... (free)
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https://lup.lub.lu.s...
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Abstract
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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- art (subject category)
- ref (subject category)
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- By the author/editor
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Cheng, Cheng
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Xu, Cong Kevin
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Appleton, P. N.
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Duc, P. A.
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Tang, N. Y.
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Dai, Y. S.
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show more...
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Huang, J. S.
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Lisenfeld, U.
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Renaud, F.
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He, Chuan
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Feng, Hai Cheng
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Astronomy Astrop ...
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Lund University