2014AJ....148..117J


Query : 2014AJ....148..117J

2014AJ....148..117J - Astron. J., 148, 117 (2014/December-0)

RX J0848.6+4453: the evolution of galaxy sizes and stellar populations in a z = 1.27 cluster.

JORGENSEN I., CHIBOUCAS K., TOFT S., BERGMANN M., ZIRM A., SCHIAVON R.P. and GRUTZBAUCH R.

Abstract (from CDS):

RX J0848.6+4453 (Lynx W) at redshift 1.27 is part of the Lynx Supercluster of galaxies. We present an analysis of the stellar populations and star formation history for a sample of 24 members of the cluster. Our study is based on deep optical spectroscopy obtained with Gemini North combined with imaging data from Hubble Space Telescope. Focusing on the 13 bulge-dominated galaxies for which we can determine central velocity dispersions, we find that these show a smaller evolution with redshift of sizes and velocity dispersions than reported for field galaxies and galaxies in poorer clusters. Our data show that the galaxies in RX J0848.6+4453 populate the fundamental plane (FP) similar to that found for lower-redshift clusters. The zero-point offset for the FP is smaller than expected if the cluster's galaxies are to evolve passively through the location of the FP we established in our previous work for z = 0.8-0.9 cluster galaxies and then to the present-day FP. The FP zero point for RX J0848.6+4453 corresponds to an epoch of last star formation at zform = 1.95–0.15+0.22. Further, we find that the spectra of the galaxies in RX J0848.6+4453 are dominated by young stellar populations at all galaxy masses and in many cases show emission indicating low-level ongoing star formation. The average age of the young stellar populations as estimated from the strength of the high-order Balmer line Hζ is consistent with a major star formation episode 1-2 Gyr prior, which in turn agrees with zform= 1.95. These galaxies dominated by young stellar populations are distributed throughout the cluster. We speculate that low-level star formation has not yet been fully quenched in the center of this cluster, possibly because the cluster is significantly poorer than other clusters previously studied at similar redshifts, which appear to have very little ongoing star formation in their centers. The mixture in RX J0848.6+4453 of passive galaxies with young stellar populations and massive galaxies still experiencing some star formation appears similar to the galaxy populations recently identified in two z ~ 2 clusters.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual: RXJ0848.6+4453 - galaxies: evolution - galaxies: stellar content

VizieR on-line data: <Available at CDS (J/AJ/148/117): table10.dat table11.dat table12.dat>

Nomenclature: Fig. 2, Table 10: [JCT2014] NNNN N=54 among (Nos 240-9001).

CDS comments: The good reference for Stott et al. 2010 is 2010ApJ...718...23S. RX J0848.6+4443, RX J0848.6+4445, RX J0848.6+4553 and RX J0848.9+4453 are probable misprints for RX J0848.6+4453.

Simbad objects: 70

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Number of rows : 70
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 ACO 194 ClG 01 26 01.3 -01 22 02           ~ 334 2
2 ClG J0152-1358 ClG 01 52 41.3 -13 58 13           ~ 245 3
3 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 2026 1
4 ClG J0332-2742 ClG 03 32 29.280 -27 42 35.99           ~ 13 0
5 ClG 0451-03 ClG 04 54 10.9 -03 01 07     20.0     ~ 334 0
6 [JCT2014] 9001 G 08 48 19.43 +44 53 46.5           ~ 1 0
7 [JCT2014] 3074 G 08 48 21.17 +44 54 33.1           ~ 1 0
8 [JCT2014] 3144 G 08 48 21.37 +44 54 32.6           ~ 1 0
9 [JCT2014] 3505 G 08 48 22.87 +44 53 20.5           ~ 1 0
10 [JCT2014] 2989 G 08 48 24.42 +44 56 09.0           ~ 2 0
11 [JCT2014] 3461 G 08 48 24.70 +44 54 13.8           ~ 1 0
12 [JCT2014] 3426 G 08 48 25.51 +44 55 46.4           ~ 1 0
13 [JCT2014] 3384 G 08 48 26.54 +44 55 18.5           ~ 1 0
14 [JCT2014] 2336 G 08 48 26.67 +44 53 19.0           ~ 1 0
15 [JCT2014] 2497 G 08 48 26.93 +44 54 30.2           ~ 1 0
16 [JCT2014] 2735 G 08 48 27.43 +44 55 28.4           ~ 2 0
17 [JCT2014] 2342 G 08 48 27.94 +44 54 51.0           ~ 1 0
18 [JCT2014] 2417 G 08 48 28.24 +44 54 22.1           ~ 1 0
19 [JCT2014] 2450 G 08 48 28.59 +44 54 41.5           ~ 1 0
20 [JCT2014] 2624 G 08 48 28.69 +44 53 03.0           ~ 1 0
21 [JCT2014] 2369 G 08 48 29.39 +44 54 41.8           ~ 1 0
22 [SCG2014] 471 G 08 48 29.685 +44 53 23.91           ~ 3 0
23 [JCT2014] 2651 G 08 48 30.56 +44 54 54.9           ~ 1 0
24 EES 237 G 08 48 30.79 +44 53 34.8           ~ 6 0
25 [JCT2014] 3030 G 08 48 32.74 +44 54 45.4           ~ 1 0
26 [RMN2011] 1794 G 08 48 32.768 +44 54 07.14           ~ 6 0
27 [SCG2014] 3 G 08 48 32.99 +44 53 46.7     26.65 24.93   ~ 10 0
28 [RMN2011] 1525 G 08 48 33.01 +44 55 11.9           ~ 3 0
29 [JCT2014] 2138 G 08 48 33.31 +44 53 27.0           ~ 1 0
30 [JCT2014] 2111 G 08 48 33.57 +44 53 44.0           ~ 2 0
31 [SCG2014] 173 G 08 48 34.058 +44 53 02.44       26.83   ~ 3 0
32 [RMN2011] 2094 G 08 48 34.069 +44 53 32.23     26.06 24.79   ~ 5 0
33 ClG J0848+4453 ClG 08 48 34.800 +44 53 41.90           ~ 122 1
34 2XMMp J084836.4+445345 G 08 48 35.98 +44 53 36.1     25.65 23.76   ~ 9 0
35 [JCT2014] 1888 G 08 48 36.17 +44 54 17.3     25.88 23.92   ~ 8 0
36 [JCT2014] 1809 G 08 48 36.96 +44 53 56.2           ~ 1 0
37 [RMN2011] 2571 G 08 48 37.071 +44 53 33.99     27.25 25.39   ~ 6 0
38 [JCT2014] 1698 G 08 48 37.45 +44 53 26.7           ~ 1 0
39 [JCT2014] 1644 G 08 48 37.96 +44 54 02.4           ~ 1 0
40 [JCT2014] 1362 G 08 48 38.64 +44 52 12.5           ~ 1 0
41 [JCT2014] 1352 G 08 48 39.28 +44 52 10.8           ~ 1 0
42 [JCT2014] 1517 G 08 48 39.36 +44 53 44.8           ~ 1 0
43 [JCT2014] 1264 G 08 48 39.66 +44 51 49.0           ~ 2 0
44 [JCT2014] 1276 G 08 48 40.07 +44 52 50.4           ~ 1 0
45 [JCT2014] 1177 G 08 48 40.36 +44 51 56.3           ~ 1 0
46 [JCT2014] 1533 G 08 48 40.81 +44 55 11.4           ~ 1 0
47 [JCT2014] 1123 G 08 48 41.81 +44 52 45.4           ~ 1 0
48 [JCT2014] 1173 G 08 48 42.73 +44 54 17.3           ~ 1 0
49 [JCT2014] 1045 G 08 48 42.94 +44 53 06.6           ~ 1 0
50 [JCT2014] 1044 G 08 48 43.29 +44 53 48.4           ~ 1 0
51 [JCT2014] 807 G 08 48 44.27 +44 52 22.8           ~ 1 0
52 [JCT2014] 722 G 08 48 44.91 +44 52 26.6           ~ 1 0
53 [JCT2014] 887 G 08 48 45.59 +44 54 30.7           ~ 1 0
54 [JCT2014] 438 G 08 48 46.12 +44 51 23.8           ~ 1 0
55 [JCT2014] 634 G 08 48 46.59 +44 53 17.0           ~ 1 0
56 [JCT2014] 654 G 08 48 46.74 +44 53 36.6           ~ 1 0
57 [JCT2014] 661 G 08 48 47.17 +44 54 28.7           ~ 1 0
58 [JCT2014] 336 G 08 48 47.33 +44 51 47.5           ~ 1 0
59 [JCT2014] 240 G 08 48 48.20 +44 52 08.9           ~ 2 0
60 [JCT2014] 361 G 08 48 49.26 +44 54 17.3           ~ 1 0
61 ClG J0849+4452 ClG 08 48 56.3 +44 52 16           ~ 104 1
62 NAME Spiderweb Galaxy AGN 11 40 48.3 -26 29 09     22.00     ~ 256 1
63 ClG J1226+3332 ClG 12 26 57.7 +33 32 50           ~ 198 0
64 ClG J1252-2927 ClG 12 52 54.4 -29 27 17           ~ 151 0
65 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4374 2
66 ISCS J143809+341419 ClG 14 38 08.71 +34 14 19.2           ~ 32 0
67 ClG J1449+0856 ClG 14 49.0 +08 56           ~ 46 0
68 ClG J2215-1738 ClG 22 15 58.5 -17 38 03           ~ 93 0
69 ClG J2235-2557 ClG 22 35 20.6 -25 57 42           ~ 140 0
70 NAME Lynx Supercluster SCG ~ ~           ~ 24 1

    Equat.    Gal    SGal    Ecl

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2021.07.30-17:24:33

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