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@article{2360031,
author = {Hu, Dan and Zajaček, Michal and Werner, Norbert and Grossová, Romana and Jáchym, Pavel and Roberts, Ian D and Ignesti, Alessandro and Kenney, D P Kenney and Plšek, Tomáš and Riffald Souza Breuer, JeanandPaul Bernhard and Shimwell, Timothy and Tasse, Cyril and Zhu, Zhenghao and Wu, Linhui},
article_number = {1},
doi = {http://dx.doi.org/10.1093/mnras/stad3219},
keywords = {galaxies: individual: HCG 97b; galaxies: interactions; radio continuum: galaxies},
language = {eng},
issn = {0035-8711},
journal = {Monthly Notices of the Royal Astronomical Society},
title = {Ram-pressure stripped radio tail and two ULXs in the spiral galaxy HCG 97b},
url = {https://arxiv.org/abs/2304.13066},
volume = {527},
year = {2024}
}
TY - JOUR
ID - 2360031
AU - Hu, Dan - Zajaček, Michal - Werner, Norbert - Grossová, Romana - Jáchym, Pavel - Roberts, Ian D - Ignesti, Alessandro - Kenney, D P Kenney - Plšek, Tomáš - Riffald Souza Breuer, Jean-Paul Bernhard - Shimwell, Timothy - Tasse, Cyril - Zhu, Zhenghao - Wu, Linhui
PY - 2024
TI - Ram-pressure stripped radio tail and two ULXs in the spiral galaxy HCG 97b
JF - Monthly Notices of the Royal Astronomical Society
VL - 527
IS - 1
SP - 1062-1080
EP - 1062-1080
PB - Oxford University Press
SN - 00358711
KW - galaxies: individual: HCG 97b
KW - galaxies: interactions
KW - radio continuum: galaxies
UR - https://arxiv.org/abs/2304.13066
N2 - We report LOFAR and VLA detections of extended radio emission in the spiral galaxy HCG 97b, hosted by an X-ray bright galaxy group. The extended radio emission detected at 144 MHz, 1.4 GHz and 4.86 GHz is elongated along the optical disk and has a tail that extends 27 kpc in projection towards the centre of the group at GHz frequencies or 60 kpc at 144 MHz. Chandra X-ray data show two off-nuclear ultra-luminous X-ray sources (ULXs), with the farther one being a plausible candidate for an accreting intermediate-mass black hole (IMBH). The asymmetry observed in both CO emission morphology and kinematics indicates that HCG 97b is undergoing ram-pressure stripping, with the leading side at the southeastern edge of the disk. Moreover, the VLA 4.86 GHz image reveals two bright radio blobs near one ULX, aligning with the disk and tail, respectively. The spectral indices in the disk and tail are comparable and flat (α>−1), suggesting the presence of recent outflows potentially linked to ULX feedback. This hypothesis gains support from estimates showing that the bulk velocity of the relativistic electrons needed for transport from the disk to the tail is approximately ∼1300 km s−1. This velocity is much higher than those observed in ram-pressure stripped galaxies (100−600 km s−1), implying an alternative mechanism aiding the stripping process. Therefore, we conclude that HCG 97b is subject to ram pressure, with the formation of its stripped radio tail likely influenced by the putative IMBH activities.
ER -
HU, Dan, Michal ZAJAČEK, Norbert WERNER, Romana GROSSOVÁ, Pavel JÁCHYM, Ian D ROBERTS, Alessandro IGNESTI, D P Kenney KENNEY, Tomáš PLŠEK, Jean-Paul Bernhard RIFFALD SOUZA BREUER, Timothy SHIMWELL, Cyril TASSE, Zhenghao ZHU and Linhui WU. Ram-pressure stripped radio tail and two ULXs in the spiral galaxy HCG 97b. \textit{Monthly Notices of the Royal Astronomical Society}. Oxford University Press, 2024, vol.~527, No~1, p.~1062-1080. ISSN~0035-8711. Available from: https://dx.doi.org/10.1093/mnras/stad3219.
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