2026A&A...706A..34M

Query : 2026A&A...706A..34M

2026A&A...706A..34M - Astronomy and Astrophysics, volume 706A34 (2026/2-1)

Targeting cluster galaxies for the 4MOST CHANCES Low-z sub-survey with photometric redshifts.

MENDEZ-HERNANDEZ H., LIMA-DIAS C., MONACHESI A., JAFFE Y.L., HAINES C.P., TEIXEIRA G.S.M., LOSCH E., BAIER-SOTO R., LIMA E.V.R., AMRUTHA B.M., BOM C.R., D'AGO G., DEMARCO R., FINOGUENOV A., HAACK R.F., LOPES A.R., DE OLIVEIRA C.M., MERLUZZI P., PIRAINO-CERDA F., SMITH CASTELLI A.V., SIFON C., SODRE L.Jr, TEJOS N., TORRES-FLORES S., ARGUDO-FERNANDEZ M., CROSSETT J.P., IBAR E., KUCHNER U., LACERNA I., LOPES-SILVA V.H., LOPEZ S., McGEE S., MORELLI L., NANTAIS J., OLIVARES V.P., PALLERO D., POGGIANTI B.M., POMPEI E., SAMPAIO V.M., VULCANI B., ZENTENO A., ALMEIDA-FERNANDES F., BILICKI M., CARVALHO M.S., CHENG C., FIGUEIREDO A.L., GUTIERREZ-SOTO L.A., HERPICH F.R., KANAAN A., LACERDA E.A.D., NAKAZONO L., OLIVEIRA SCHWARZ G.B., RIBEIRO T., ROUKEMA B.F., SARTORI M.J., SANTOS-SILVA T. and SCHOENELL W.

Abstract (from CDS):

Context. 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 with respect to 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.
Aims. We present the target selection strategy followed to select galaxy cluster candidate members for the CHANCES Low-z sub-survey. The selection was focussed in and around 50 clusters and two superclusters at z < 0.07, out to (5 × R200) and down to mr = 20.4.
Methods. Combining public photometric redshift estimates from the DESI Legacy Imaging Survey and T80S/S-PLUS iDR5 with custom photometric redshifts, we were able to identify likely galaxy cluster candidate members, whose photometric redshifts were consistent with being located at the known redshift of the cluster. We measured the average deviations of their photometric redshifts with respect to the spectroscopic redshift measurements, σNMAD. We tested various selection parameters to maximise completeness, while maintaining purity.
Results. We 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. To do so, we selected ≳500 000 galaxy cluster candidate members and included confirmed spectroscopic galaxy cluster members, from which we expect to obtain 4MOST low-resolution (R ∼ 6500) spectra for ∼320 000 galaxies.
Conclusions. The CHANCES Low-z target catalogues form a statistically robust sample for spectroscopic follow-up, enabling studies of galaxy evolution and environmental effects in nearby cluster and supercluster environments.

Abstract Copyright: © The Authors 2026

Journal keyword(s): techniques: miscellaneous - surveys - galaxies: clusters: general

Simbad objects: 39

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Number of rows : 39
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ACO 2717 ClG 00 03 12.9 -35 56 13           ~ 146 0
2 ACO 2734 ClG 00 11 21.60 -28 51 16.6           ~ 156 0
3 ACO 85 ClG 00 41 36.21 -09 19 30.4           ~ 974 0
4 ACO 133 ClG 01 02 41.5 -21 52 53           ~ 391 1
5 ACO 2870 ClG 01 07 42.57 -46 54 28.9           ~ 38 1
6 ACO 147 ClG 01 08 10 +02 10.0           ~ 117 0
7 ACO 151 ClG 01 08 52.3 -15 25 01           ~ 199 1
8 ACO 168 ClG 01 15 07.58 +00 19 10.8           ~ 379 2
9 NAME HOR-RET SUPERCL SCG 03 16 -48.0           ~ 70 3
10 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
11 ACO 3223 ClG 04 08 34.5 -30 49 08           ~ 59 2
12 ACO 3266 ClG 04 31 26.4 -61 25 17           ~ 447 0
13 ACO 496 ClG 04 33 40.8 -13 14 34           ~ 728 2
14 NAME Ret GlC 04 36 10.15 -58 51 34.8   14.00 14.25 13.50   ~ 177 1
15 ACO 500 ClG 04 38 55.0 -22 05 55           ~ 89 0
16 ACO 548 ClG 05 47 01.7 -25 36 59           B8 209 2
17 ACO S 560 ClG 06 00 44 -58 36.0           ~ 13 0
18 ACO 3376 ClG 06 01 25.000 -39 59 51.00           ~ 334 0
19 ACO 754 ClG 09 09 14.8 -09 40 35           ~ 695 1
20 ACO 780 ClG 09 18 30 -12 15.7           ~ 469 0
21 ACO 957 ClG 10 14 02.35 -00 53 30.0           ~ 225 2
22 ACO S 636 ClG 10 29 41.0957 -35 19 32.908           ~ 248 0
23 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 905 1
24 ACO 1069 ClG 10 39 54.3 -08 36 40           ~ 116 1
25 NAME Coma Supercluster SCG 11 23 +23.9           ~ 291 0
26 ACO 3490 ClG 11 45 19.6 -34 25 59           ~ 55 1
27 ACO 3497 ClG 12 00 03 -31 23.7           ~ 42 0
28 NAME NGC 4073 Group GrG 12 04 44.08 +01 48 40.9     13.53     ~ 292 0
29 ACO 1520 ClG 12 19 19.8 -13 15 36           ~ 22 0
30 ACO 1631 ClG 12 52 50.6 -15 25 37           ~ 176 1
31 ACO 1644 ClG 12 57 11.6 -17 24 34           ~ 391 1
32 NAME Shapley Supercluster SCG 13 06.0 -33 04           ~ 677 0
33 BAX 220.1796+03.4530 ClG 14 40 34.37 +03 29 49.7     14.31     ~ 131 0
34 ACO 3651 ClG 19 52 10.9 -55 05 16           ~ 74 0
35 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 676 1
36 ACO 3716 ClG 20 51 16.7 -52 41 43           ~ 123 1
37 ACO 3809 ClG 21 46 57.5 -43 54 06           ~ 99 0
38 ACO 2399 ClG 21 57 19.01 -07 50 57.5           ~ 197 0
39 ACO 2415 ClG 22 05 25.0 -05 35 23           ~ 124 1

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