Targeting cluster galaxies for the 4MOST CHANCES Low-z sub-survey with photometric redshifts
arXiv:2510.19958 · doi:10.1051/0004-6361/202556796
Abstract
The evolution of galaxies is shaped by both internal processes and their external environments. Galaxy clusters and their surroundings provide ideal laboratories to study these effects, particularly mechanisms such as quenching and morphological transformation. The Chilean Cluster galaxy Evolution Survey (CHANCES) Low-z sub-survey is part of the CHileAN Cluster galaxy Evolution Survey, a 4MOST community survey designed to uncover the relationship between the formation and evolution of galaxies and hierarchical structure formation as it happens, through deep and wide multi-object spectroscopy. We present the target selection strategy followed to select galaxy cluster candidate members for the CHANCES low-z sub-survey, in and around 50 clusters and two superclusters at z<0.07, out to (5XR200) and down to mr= 20.4. Combining public photometric redshift estimates from the DESI Legacy Imaging Survey and T80S/S-PLUS iDR5, with custom photometric redshifts, we identify likely galaxy cluster candidate members whose photometric redshifts are consistent with being at the known redshift of the cluster and measure the average deviations of their photometric redshifts with respect to the spectroscopic redshift measurements σNMAD. We have successfully compiled our CHANCES-low-redshift catalogues, split into three different sub-surveys: low-z bright (mr<18.5), low-z faint (18.5<=mr<20.4) and low-z faint supplementary, by selecting>= 500,000 galaxy cluster candidate members and including confirmed spectroscopic galaxy cluster members, from which we expect to obtain 4MOST low-resolution (R~6500) spectra for ~320,000 galaxies. The CHANCES Low-z target catalogues form a statistically robust sample for spectroscopic follow-up, allowing studies of galaxy evolution and environmental effects in nearby cluster and supercluster environments.
References in corpus (21)
- Array Programming with NumPy
- The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
- Mass and environment as drivers of galaxy evolution in SDSS and zCOSMOS and the origin of the Schechter function
- EAZY: A Fast, Public Photometric Redshift Code
- The SRG/eROSITA all-sky survey: First X-ray catalogues and data release of the western Galactic hemisphere
- The Early Data Release of the Dark Energy Spectroscopic Instrument
- The Eighteenth Data Release of the Sloan Digital Sky Surveys: Targeting and First Spectra from SDSS-V
- LoCuSS: The slow quenching of star formation in cluster galaxies and the need for pre-processing
- Gaia Data Release 3: Processing and validation of BP/RP low-resolution spectral data
- Gaia Data Release 3: External calibration of BP/RP low-resolution spectroscopic data
- The Different Physical Mechanisms that Drive the Star-Formation Histories of Giant and Dwarf Galaxies
- The DECam Local Volume Exploration Survey: Overview and First Data Release
- LoCuSS: Pre-processing in galaxy groups falling into massive galaxy clusters at z=0.2
- An inventory of galaxies in cosmic filaments feeding galaxy clusters: galaxy groups, backsplash galaxies, and pristine galaxies
- DESI luminous red galaxy samples for cross-correlations
- Data Release 2 of S-PLUS: accurate template-fitting based photometry covering 1000 square degrees in 12 optical filters
- The Role of Groups in Galaxy Evolution: compelling evidence of pre-processing out to the turnaround radius of clusters
- eROSITA clusters dynamical state and their impact on the BCG luminosity
- CHANCES, the Chilean Cluster Galaxy Evolution Survey: Selection and initial characterisation of clusters and superclusters
- Deep view of the intracluster light in the Coma cluster of galaxies
- The role of supercluster filaments in shaping galaxy clusters