Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 484, Issue 2, Pages 2212-2228Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stz136
Keywords
ISM: evolution; galaxies: clusters: intracluster medium; galaxies: evolution; galaxies: groups: individual: A1367; galaxies: interactions
Categories
Funding
- Science and Technology Facilities Council [ST/P000541/1]
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [757535]
- Deutsche Forschungsgemeinschaft [WI 3871/1-1, WI 3871/12]
- European Organisation for Astronomical Research in the Southern hemisphere under ESO programme [095.B-0023]
- STFC [ST/P000541/1] Funding Source: UKRI
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We report new wide-field (approximate to 4 x 4 arcmin(2)) Multi Unit Spectroscopic Explorer (MUSE) observations of the Blue Infalling Group (BIG), a compact group of galaxies located at a projected distance of similar or equal to 150 kpc from the X-ray centre of the A1367 cluster at z = 0.021. Our MUSE observations map in detail the extended ionized gas, primarily traced by H alpha emission, in between the members of the group. The gas morphology and its kinematics appear consistent with a tidal origin due to galaxy encounters, as also supported by the disturbed kinematics visible in one of the group members and the presence of tidal dwarf systems. A diffuse tail extending in the direction opposite to the cluster centre is also detected, hinting at a global ram-pressure stripping of the intragroup material as BIG falls inside A1367. Based on the analysis of spatially resolved emission line maps, we identify multiple ionization mechanisms for the diffuse gas filaments, including in situ photoionization from embedded H it regions and shocks. Combining spatially resolved kinematics and line ratios, we rule out the association of the most massive galaxy, CGCG097-120, with the group as this system appears to be decoupled from the intragroup medium and subject to strong ram pressure as it falls into A1367. Through our new analysis, we conclude that BIG is shaped by pre-processing produced by gravitational interactions in the Local Group environment combined with ram-pressure stripping by the global cluster halo.
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