首页|New HⅠ Observations Toward the NGC 5055 Galaxy Group with FAST

New HⅠ Observations Toward the NGC 5055 Galaxy Group with FAST

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We report a new high-sensitivity HⅠ mapping observation of the NGC 5055 galaxy group over an area of(1.°5)×(0°75)with the Five-hundred-meter Aperture Spherical radio Telescope(FAST).Our observation reveals that the warped HⅠ disk of NGC 5055 is more extended than what was previously observed by WSRT,out to(23'.9)(61.7 kpc).The total HⅠ mass of NGC 5055 is determined to be～1.1 × 1010M⊙.We identified three HⅠclouds with HⅠ masses of the order of～107M⊙ at the southeastern edge of the HⅠ disk,as well as a candidate high-velocity cloud with an HⅠ mass of(1.2±0.5)× 106M⊙to the north of NGC 5055.The HⅠ content of UGCA 337 is robustly detected for the first time by the FAST observations.It has a narrow HⅠ linewidth of W50=17.4±3.8 km s-1 with a total HⅠ mass of(3.5±0.3)× 106 M⊙.Comparing the gas content and g-r color of UGCA 337 with typical low-mass dwarf galaxies,UGCA 337 appears relatively gas-poor despite its blue color.This suggests that UGCA 337 may have undergone gas stripping in the past.We also analyzed the possible origin of the diffuse HⅠ clouds located at the outskirts of NGC 5055,and speculate that they might be the remnant features of a merger event in the past.

galaxies:evolutiongalaxies:structuregalaxies:individual(NGC 5055)galaxies:kinematics and dynamicsgalaxies:interactions

Xiao-Lan Liu、Ming Zhu、Jin-Long Xu、Peng Jiang、Chuan-Peng Zhang、Nai-Ping Yu、Jun-Jie Wang、Yan-Bin Yang

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National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China

Guizhou Radio Astronomical Observatory,Guizhou University,Guiyang 550000,China

CAS Key Laboratory of FAST,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China

GEPI,Observatoire de Paris,Universite PSL,CNRS,Place Jules Janssen,92195 Meudon,France

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National Key R&D Program of ChinaNational Natural Science Foundation of China(NSFC)Open Project Program of the Key Laboratory of FAST,NAOC,Chinese Academy of Sciences

2022YFA160290112373001

2024

10.1088/1674-4527/ad4fc3

天文和天体物理学研究
中国科学院国家天文台

天文和天体物理学研究

CSTPCD
影响因子：0.406
ISSN：1674-4527
年,卷(期)：2024.24(7)