OMEGA - OSIRIS mapping of emission-line galaxies in A901/2: III. - Galaxy properties across projected phase space in A901/2
We conduct a comprehensive projected phase-space analysis of the A901/2 multicluster system at z ∼ 0.165. Aggregating redshifts from spectroscopy, tunable-filter imaging and prism techniques, we assemble a sample of 856 cluster galaxies reaching 108.5 M⊙ in stellar mass. We look for variations in cl...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
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Oxford University Press
2017
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| Online Access: | https://eprints.nottingham.ac.uk/43655/ |
| _version_ | 1848796737262583808 |
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| author | Weinzirl, Tim Aragón-Salamanca, Alfonso Gray, Meghan E. Bamford, Steven P. Rodriguez Del Pino, Bruno Chies-Santos, Ana L. Böhm, Asmus Wolf, Christian Cool, Richard J. |
| author_facet | Weinzirl, Tim Aragón-Salamanca, Alfonso Gray, Meghan E. Bamford, Steven P. Rodriguez Del Pino, Bruno Chies-Santos, Ana L. Böhm, Asmus Wolf, Christian Cool, Richard J. |
| author_sort | Weinzirl, Tim |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | We conduct a comprehensive projected phase-space analysis of the A901/2 multicluster system at z ∼ 0.165. Aggregating redshifts from spectroscopy, tunable-filter imaging and prism techniques, we assemble a sample of 856 cluster galaxies reaching 108.5 M⊙ in stellar mass. We look for variations in cluster galaxy properties between virialized and non-virialized regions of projected phase space (PPS). Our main conclusions point to relatively gentle environmental effects, expressed mainly on galaxy gas reservoirs. (1) Stacking the four subclusters in A901/2, we find galaxies in the virialized region are more massive, redder and have marginally higher Sérsic indices, but their half-light radii and Hubble types are not significantly different. (2) After accounting for trends in stellar mass, there is a remaining change in rest-frame colour across PPS. Primarily, the colour difference is due to the absence in the virialized region of galaxies with rest frame B − V < 0.7 and moderate-to-high (M⋆ > 109.85 M⊙) stellar mass. (3) There is an infalling population of lower mass (M⋆ ≤ 109.85 M⊙), relatively blue (B − V < 0.7) elliptical or spheroidal galaxies that are strikingly absent in the virialized region. (4) The number of bona fide star-forming and active galactic nucleus galaxies in the PPS regions is strongly dictated by stellar mass. However, there remains a reduced fraction of star-forming galaxies in the centres of the clusters at fixed stellar mass, consistent with the star formation–density relation in galaxy clusters. (5) There is no change in specific Hα-derived star formation rates of star-forming galaxies at fixed mass across the cluster environment. This suggests that pre-processing of galaxies during infall plays a prominent role in quenching star formation. |
| first_indexed | 2025-11-14T19:52:44Z |
| format | Article |
| id | nottingham-43655 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:52:44Z |
| publishDate | 2017 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-436552020-05-04T19:14:59Z https://eprints.nottingham.ac.uk/43655/ OMEGA - OSIRIS mapping of emission-line galaxies in A901/2: III. - Galaxy properties across projected phase space in A901/2 Weinzirl, Tim Aragón-Salamanca, Alfonso Gray, Meghan E. Bamford, Steven P. Rodriguez Del Pino, Bruno Chies-Santos, Ana L. Böhm, Asmus Wolf, Christian Cool, Richard J. We conduct a comprehensive projected phase-space analysis of the A901/2 multicluster system at z ∼ 0.165. Aggregating redshifts from spectroscopy, tunable-filter imaging and prism techniques, we assemble a sample of 856 cluster galaxies reaching 108.5 M⊙ in stellar mass. We look for variations in cluster galaxy properties between virialized and non-virialized regions of projected phase space (PPS). Our main conclusions point to relatively gentle environmental effects, expressed mainly on galaxy gas reservoirs. (1) Stacking the four subclusters in A901/2, we find galaxies in the virialized region are more massive, redder and have marginally higher Sérsic indices, but their half-light radii and Hubble types are not significantly different. (2) After accounting for trends in stellar mass, there is a remaining change in rest-frame colour across PPS. Primarily, the colour difference is due to the absence in the virialized region of galaxies with rest frame B − V < 0.7 and moderate-to-high (M⋆ > 109.85 M⊙) stellar mass. (3) There is an infalling population of lower mass (M⋆ ≤ 109.85 M⊙), relatively blue (B − V < 0.7) elliptical or spheroidal galaxies that are strikingly absent in the virialized region. (4) The number of bona fide star-forming and active galactic nucleus galaxies in the PPS regions is strongly dictated by stellar mass. However, there remains a reduced fraction of star-forming galaxies in the centres of the clusters at fixed stellar mass, consistent with the star formation–density relation in galaxy clusters. (5) There is no change in specific Hα-derived star formation rates of star-forming galaxies at fixed mass across the cluster environment. This suggests that pre-processing of galaxies during infall plays a prominent role in quenching star formation. Oxford University Press 2017-10-31 Article PeerReviewed Weinzirl, Tim, Aragón-Salamanca, Alfonso, Gray, Meghan E., Bamford, Steven P., Rodriguez Del Pino, Bruno, Chies-Santos, Ana L., Böhm, Asmus, Wolf, Christian and Cool, Richard J. (2017) OMEGA - OSIRIS mapping of emission-line galaxies in A901/2: III. - Galaxy properties across projected phase space in A901/2. Monthly Notices of the Royal Astronomical Society, 471 (1). pp. 182-200. ISSN 1365-2966 instrumentation: interferometers galaxies: clusters: individual: A901/2 galaxies: distances and redshifts galaxies: star formation https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stx1525 doi:10.1093/mnras/stx1525 doi:10.1093/mnras/stx1525 |
| spellingShingle | instrumentation: interferometers galaxies: clusters: individual: A901/2 galaxies: distances and redshifts galaxies: star formation Weinzirl, Tim Aragón-Salamanca, Alfonso Gray, Meghan E. Bamford, Steven P. Rodriguez Del Pino, Bruno Chies-Santos, Ana L. Böhm, Asmus Wolf, Christian Cool, Richard J. OMEGA - OSIRIS mapping of emission-line galaxies in A901/2: III. - Galaxy properties across projected phase space in A901/2 |
| title | OMEGA - OSIRIS mapping of emission-line galaxies in A901/2: III. - Galaxy properties across projected phase space in A901/2 |
| title_full | OMEGA - OSIRIS mapping of emission-line galaxies in A901/2: III. - Galaxy properties across projected phase space in A901/2 |
| title_fullStr | OMEGA - OSIRIS mapping of emission-line galaxies in A901/2: III. - Galaxy properties across projected phase space in A901/2 |
| title_full_unstemmed | OMEGA - OSIRIS mapping of emission-line galaxies in A901/2: III. - Galaxy properties across projected phase space in A901/2 |
| title_short | OMEGA - OSIRIS mapping of emission-line galaxies in A901/2: III. - Galaxy properties across projected phase space in A901/2 |
| title_sort | omega - osiris mapping of emission-line galaxies in a901/2: iii. - galaxy properties across projected phase space in a901/2 |
| topic | instrumentation: interferometers galaxies: clusters: individual: A901/2 galaxies: distances and redshifts galaxies: star formation |
| url | https://eprints.nottingham.ac.uk/43655/ https://eprints.nottingham.ac.uk/43655/ https://eprints.nottingham.ac.uk/43655/ |