2015ApJ...799...38K -
Astrophys. J., 799, 38 (2015/January-3)
NIR spectroscopic observation of massive galaxies in the protocluster at z = 3.09.
KUBO M., YAMADA T., ICHIKAWA T., KAJISAWA M., MATSUDA Y. and TANAKA I.
Abstract (from CDS):
We present the results of near-infrared spectroscopic observations of the K-band-selected candidate galaxies in the protocluster at z = 3.09 in the SSA22 field. We observed 67 candidates with KAB< 24 and confirmed redshifts of the 39 galaxies at 2.0 < zspec< 3.4. Of the 67 candidates, 24 are certainly protocluster members with 3.04 ≤ zspec ≤ 3.12, which are massive red galaxies that have been unidentified in previous optical observations of the SSA22 protocluster. Many distant red galaxies (J - KAB> 1.4), hyper extremely red objects (J - KAB> 2.1), Spitzer MIPS 24 µm sources, active galactic nuclei (AGNs) as well as the counterparts of Lyα blobs and the AzTEC/ASTE 1.1 mm sources in the SSA22 field are also found to be protocluster members. The mass of the SSA22 protocluster is estimated to be ∼2-5x1014 M☉, and this system is plausibly a progenitor of the most massive clusters of galaxies in the current universe. The reddest (J - KAB ≥ 2.4) protocluster galaxies are massive galaxies with Mstar∼ 1011 M☉ showing quiescent star formation activities and plausibly dominated by old stellar populations. Most of these massive quiescent galaxies host moderately luminous AGNs detected by X-ray. There are no significant differences in the [O III] λ5007/Hβ emission line ratios and [O III] λ5007 line widths and spatial extents of the protocluster galaxies from those of massive galaxies at z ∼ 2-3 in the general field.
Abstract Copyright:
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Journal keyword(s):
cosmology: observations - galaxies: clusters: general - galaxies: evolution - galaxies: formation - galaxies: high-redshift
Nomenclature:
Table 3: [KYI2015] JHHMMSS.s+DDMMSS.s N=39.
Simbad objects:
45
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