Deep H i Mapping of Stephan's Quintet and Its Neighborhood
(2023) In Astrophysical Journal 954(1).- Abstract
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... (More)
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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- author
- organization
- publishing date
- 2023-09-01
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Astrophysical Journal
- volume
- 954
- issue
- 1
- article number
- 74
- publisher
- American Astronomical Society
- external identifiers
-
- scopus:85170518333
- ISSN
- 0004-637X
- DOI
- 10.3847/1538-4357/ace03e
- language
- English
- LU publication?
- yes
- id
- e5a2dc1e-36f6-4363-b7c7-9bf969f793f9
- date added to LUP
- 2024-01-12 11:00:31
- date last changed
- 2024-01-12 11:02:09
@article{e5a2dc1e-36f6-4363-b7c7-9bf969f793f9,
abstract = {{<p>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.</p>}},
author = {{Cheng, Cheng and Xu, Cong Kevin and Appleton, P. N. and Duc, P. A. and Tang, N. Y. and Dai, Y. S. and Huang, J. S. and Lisenfeld, U. and Renaud, F. and He, Chuan and Feng, Hai Cheng}},
issn = {{0004-637X}},
language = {{eng}},
month = {{09}},
number = {{1}},
publisher = {{American Astronomical Society}},
series = {{Astrophysical Journal}},
title = {{Deep H i Mapping of Stephan's Quintet and Its Neighborhood}},
url = {{http://dx.doi.org/10.3847/1538-4357/ace03e}},
doi = {{10.3847/1538-4357/ace03e}},
volume = {{954}},
year = {{2023}},
}