期刊
ASTROPHYSICAL JOURNAL
卷 776, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/776/1/9
关键词
galaxies: clusters: individual (Cl J1449+0856); galaxies: high-redshift
资金
- Japanese Ministry of Education, Culture, Sports, Science and Technology [23224005]
- INAF grant PRIN
- MIUR PRIN
- NASA [NAS 5-26555]
- [ERC-StG UPGAL 240039]
- [ANR-08-JCJC-0008]
- [ASI n.I/023/12/0]
- Grants-in-Aid for Scientific Research [23224005] Funding Source: KAKEN
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 M-140 similar to 25.5 AB and 3 sigma line fluxes of similar to 5x10(-18) erg s(-1) cm(-2). In particular, we were able to spectroscopically confirm 12 early-type galaxies (ETGs) in the field up to z similar to 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 similar to 6 arcmin(2) 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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