An HI story of galaxies in Abell 2626 and beyond
arXiv:2303.10141 · doi:10.1051/0004-6361/202244910
Abstract
Context: To study the effects of environment on galaxies we use HI observations of galaxies in and around the cluster A2626. The cluster can effectively be divided in three different environments: the cluster itself, a group environment in the periphery of the cluster (we call it the Swarm) and substructure in the cluster itself. We use these to study the dependence of galaxy properties on environment. Aims: We have explored the relationship between HI deficiency, HI morphology, and star formation deficiency for the galaxies in and around the A2626 galaxy cluster to investigate the environmental effects on those properties. Methods: To quantify asymmetries of the outer HI disc of a galaxy, we used 1) three visual classes based on the outermost reliable HI contour (settled, disturbed, unsettled HI discs), 2) the offset between the HI centre and the optical centre of a galaxy, and 3) the modified asymmetry parameter Amod as defined by Lelli et al. (2014). Results: The HI deficiency of a galaxy is strongly correlated with the projected distance from the centre of A2626. Furthermore, substructure galaxies tend to be more asymmetric than the isolated galaxies in A2626, plausibly because of more efficient tidal interactions within substructures than outside substructures. Moreover, asymmetric, offset, and smaller HI discs are not necessarily the result of the cluster environment, as they are also observed in substructures in A2626 and in the Swarm. This signifies that "pre-processing" of the HI discs of galaxies in groups or substructures plays an important role, together with the "processing" in the cluster environment. Finally, the galaxies in all three environments have slightly lower star-formation rates (SFRs) than the typical SFR for normal galaxies as manifested by their offset from the star formation main sequence, implying effective gas removal mechanisms in all three environments.
19 pages, 12 figures
References in corpus (21)
- The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
- Star Formation in AEGIS Field Galaxies since z=1.1 : The Dominance of Gradually Declining Star Formation, and the Main Sequence of Star-Forming Galaxies
- A Highly Consistent Framework for the Evolution of the Star-Forming "Main Sequence" from z~0-6
- The EAGLE simulations of galaxy formation: calibration of subgrid physics and model variations
- SoFiA: a flexible source finder for 3D spectral line data
- BUDHIES II: A phase-space view of HI gas stripping and star-formation quenching in cluster galaxies
- The Dawes Review 9: The role of cold gas stripping on the star formation quenching of satellite galaxies
- Environmentally-Driven Evolution of Simulated Cluster Galaxies
- The triggering of starbursts in low-mass galaxies
- New HI scaling relations to probe the HI content of galaxies via global HI-deficiency maps
- GASP XVII. HI imaging of the jellyfish galaxy JO206: gas stripping and enhanced star formation
- GASP. XVI. Does cosmic web enhancement turn on star formation in galaxies?
- A blind ATCA HI survey of the Fornax galaxy cluster: properties of the HI detections
- GASP XXVI. HI Gas in Jellyfish Galaxies: The case of JO201 and JO206
- GASP XXV: Neutral Hydrogen gas in the striking Jellyfish Galaxy JO204
- Galaxy and Mass Assembly (GAMA): Demonstrating the power of WISE in the study of Galaxy Groups to
- Non-parametric estimation of morphological lopsidedness
- The Westerbork Coma Survey: A blind, deep, high-resolution HI survey of the Coma cluster
- GASP XXXIX: MeerKAT hunts Jellyfish in A2626
- Using EAGLE simulations to study the effect of observational constraints on the determination of HI asymmetries in galaxies
- Abell 2626 and friends: large and small scale structure