2013ApJ...776....9G

Query : 2013ApJ...776....9G

2013ApJ...776....9G - Astrophys. J., 776, 9 (2013/October-2)

WFC3 GRISM confirmation of the distant cluster Cl J1449+0856 at $ < z$ > = 2.00: quiescent and star-forming galaxy populations.

GOBAT R., STRAZZULLO V., DADDI E., ONODERA M., CAROLLO M., RENZINI A., FINOGUENOV A., CIMATTI A., SCARLATA C. and ARIMOTO N.

Abstract (from CDS):

We present deep Hubble Space Telescope Wide Field Camera 3 (HST/WFC3) slitless spectroscopic observations of the distant cluster Cl J1449+0856. These cover a single pointing with 18 orbits of G141 spectroscopy and F140W imaging, allowing us to derive secure redshifts down to M140∼ 25.5 AB and 3σ line fluxes of ∼5x10–18 erg/s/cm2. In particular, we were able to spectroscopically confirm 12 early-type galaxies (ETGs) in the field up to z ∼ 3, 6 of which are in the cluster core, which represents the first direct spectroscopic confirmation of quiescent galaxies in a z = 2 cluster environment. With 140 redshifts in a ∼6 arcmin2 field, we can trace the spatial and redshift galaxy distribution in the cluster core and background field. We find two strong peaks at z = 2.00 and z = 2.07, where only one was seen in our previously published ground-based data. Due to the spectroscopic confirmation of the cluster ETGs, we can now reevaluate the redshift of Cl J1449+0856 at z = 2.00, rather than z = 2.07, with the background overdensity being revealed to be sparse and "sheet"-like. This presents an interesting case of chance alignment of two close yet unrelated structures, each one preferentially selected by different observing strategies. With 6 quiescent or early-type spectroscopic members and 20 star-forming ones, Cl J1449+0856 is now reliably confirmed to be at z = 2.00. The identified members can now allow for a detailed study of galaxy properties in the densest environment at z = 2.

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Journal keyword(s): galaxies: clusters: individual: Cl J1449+0856 - galaxies: high-redshift

Nomenclature: Table 2: [GSD2013b] NNNNN N=25 among (Nos 41-22111), Table 2: [GSD2013b] NNNN.N N=2 (Nos 141.2, 1411.3).

Simbad objects: 28

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Number of rows : 28
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 [GSD2013b] 1438 G 14 48 34.2920 +08 50 38.049           ~ 1 0
2 NAME BzK 4008 G 14 48 44.9048 +08 53 46.544   27.31   25.97 25.84 ~ 2 0
3 [GSD2013b] 141.2 G 14 48 47.9517 +08 55 23.886           ~ 1 0
4 ClG J1449+0856 ClG 14 49.0 +08 56           ~ 70 0
5 [GSD2013b] 183 G 14 49 11.1191 +08 55 29.264           ~ 2 0
6 [GSD2013b] 631 G 14 49 11.2743 +08 56 24.985           ~ 2 0
7 [GSD2013b] 599 G 14 49 11.4111 +08 56 21.634           ~ 2 0
8 [GSD2013b] 683 G 14 49 11.5710 +08 56 32.943           ~ 1 0
9 [GSD2013b] 422 G 14 49 11.6203 +08 56 00.407           ~ 4 0
10 [GSD2013b] 510 G 14 49 11.9757 +08 56 12.744           ~ 4 0
11 [GSD2013b] 645 G 14 49 12.4568 +08 56 29.743           ~ 1 0
12 [GSD2013b] 44 G 14 49 12.6109 +08 55 04.668           ~ 1 0
13 [GSD2013b] 568 G 14 49 12.6201 +08 56 19.235           ~ 4 0
14 [GSD2013b] 41 G 14 49 12.6994 +08 55 04.800           ~ 2 0
15 [GDO2011] 5225 G 14 49 13.4445 +08 56 34.605           ~ 2 0
16 [GSD2013b] 580 G 14 49 13.7267 +08 56 23.058           ~ 4 0
17 [GSD2013b] 661 G 14 49 14.0958 +08 56 31.011           ~ 3 0
18 [GDO2011] 5125 G 14 49 14.1036 +08 56 27.473           ~ 2 0
19 [GSD2013b] 709 G 14 49 14.1372 +08 56 36.096           ~ 3 0
20 [GDO2011] 5138 G 14 49 14.1819 +08 56 26.435           ~ 2 0
21 [GDO2011] 4942 G 14 49 14.2256 +08 56 22.085           ~ 2 0
22 [GDO2011] 4774 G 14 49 14.4096 +08 56 15.994           ~ 2 0
23 [GDO2011] 5113 G 14 49 14.4943 +08 56 23.157           ~ 4 0
24 [GDO2011] 4948 G 14 49 14.5608 +08 56 20.758           ~ 2 0
25 [GSD2013b] 1127 G 14 49 17.3767 +08 51 12.468           ~ 1 0
26 [GSD2013b] 843 G 14 49 17.8281 +08 57 08.928           ~ 2 0
27 [GSD2013b] 279 G 14 49 18.2522 +08 55 41.432           ~ 1 0
28 [GSD2013b] 22111 G 14 49 22.8026 +08 56 59.510           ~ 1 0

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