Table · dataset · 2025
Redshift catalogue for SMACS J0723.3-7327
Listed in IVOA Registry (Virtual Observatory)
We present a new wide-field spectroscopic survey of the galaxy cluster SMACS J0723.3-7327 at z~0.39, with the aim of mapping the large-scale structure around this massive cluster.
Description
We also aim to detect infalling galaxy groups in combination with XMM-Newton and eROSITA X-ray data, while studying the evolution and transformation of cluster galaxies out to ~2r_200_. We carried out new multi-slit spectroscopic observations of SMACS J0723-3-7327 with the IMACS f/2 instrument on the 6.5m Magellan-Baade telescope, obtaining spectra for 193 galaxies selected using deep near-infrared (NIR) photometry from the Galaxy Clusters at VIRCAM (GCAV) survey.
We examined the infall pattern of galaxies in the caustic diagram out to ~2r_200_ and used it to identify 93 cluster members from our sample as being located within the caustic curves. Incorporating redshifts from previous studies of the cluster core, we produced a catalogue of 150 spectroscopically-confirmed cluster members. We measured a central cluster redshift of z=0.3910+/-0.0007 and a velocity dispersion of {sigma}_V_=1431+/-150km/s for galaxies within r_200_.
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We found sub-structures within the velocity distribution function and a filamentary structure passing SE-NW through the cluster, likely related to the highly elongated mass distribution and X-ray emission seen in the central regions of the cluster. Using an optical colour-colour separation, we determine the fraction of star-forming galaxies as a function of cluster-centric radius out to 5r_200_ using photometric data, finding it consistently lower compared to coeval field galaxies even at 5r_200_.
We identified a number of clumps of red galaxies in the cluster infall regions, suggestive of infalling groups in which galaxies could be undergoing pre-processing, even if we were unable to detect any associated X-ray emission in the XMM or eROSITA data. This work confirms the dynamical complexity of cluster SMACS J0723.3-7327 and the surrounding large-scale structure, similar to that seen for other massive clusters at z~0.4.
Further spectroscopic analyses across larger cluster-centric distances are essential to comprehensively assess the dynamical state of the cluster and investigate how environmental mechanisms influence star formation quenching in galaxies at varying radial distances.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/699/A105 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2025A&A...699A.105A ui.adsabs.harvard.edu/abs/2025A%26A...699A.105A ↗
publication · from IVOA Registry
Catalogue records · 2
- VOResource record dc.g-vo.org/oai.xml?verb=GetRecord&metadataPrefix=ivo_vor&identifier=ivo%3… ↗
metadata API · from IVOA Registry
- Registry record (GAVO) dc.g-vo.org/I/cds.vizier/j/a%2Ba/699/a105 ↗
catalogue entry · from IVOA Registry
Topics
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 7 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/699/a105 | 14 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| description | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_description |
| license_text | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| publication_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| title | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_title |
| updated_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 |