2016ApJ...816...48N


Query : 2016ApJ...816...48N

2016ApJ...816...48N - Astrophys. J., 816, 48 (2016/January-2)

The phase space of z∼1.2 SpARCS clusters: using Herschel to probe dust temperature as a function of environment and accretion history.

NOBLE A.G., WEBB T.M.A., YEE H.K.C., MUZZIN A., WILSON G., VAN DER BURG R.F.J., BALOGH M.L. and SHUPE D.L.

Abstract (from CDS):

We present a five-band Herschel study (100-500 µm) of three galaxy clusters at z∼1.2 from the Spitzer Adaptation of the Red-Sequence Cluster Survey. With a sample of 120 spectroscopically confirmed cluster members, we investigate the role of environment on galaxy properties utilizing the projected cluster phase space (line-of-sight velocity versus clustercentric radius), which probes the time-averaged galaxy density to which a galaxy has been exposed. We divide cluster galaxies into phase-space bins of (r/r200)×(Δv/σv), tracing a sequence of accretion histories in phase space. Stacking optically star-forming cluster members on the Herschel maps, we measure average infrared star formation rates, and, for the first time in high-redshift galaxy clusters, dust temperatures for dynamically distinct galaxy populations-namely, recent infalls and those that were accreted onto the cluster at an earlier epoch. Proceeding from the infalling to virialized (central) regions of phase space, we find a steady decrease in the specific star formation rate and increase in the stellar age of star-forming cluster galaxies. We perform a probability analysis to investigate all acceptable infrared spectral energy distributions within the full parameter space and measure a ∼4σ drop in the average dust temperature of cluster galaxies in an intermediate phase-space bin, compared to an otherwise flat trend with phase space. We suggest one plausible quenching mechanism which may be consistent with these trends, invoking ram-pressure stripping of the warmer dust for galaxies within this intermediate accretion phase.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - galaxies: evolution - galaxies: high-redshift - galaxies: star formation - infrared: galaxies

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6593 0
2 SpARCS J161641+554513 ClG 16 16 41.30 +55 45 12.5           ~ 22 0
3 SpARCS J163437+402149 ClG 16 34 35.0 +40 21 51           ~ 23 0
4 SpARCS J163852+403843 ClG 16 38 52.0 +40 38 43           ~ 25 0

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