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Article overview
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Planck far-infrared detection of Hyper Suprime-Cam protoclusters at $f zsim4$: hidden AGN and star formation activity | Mariko Kubo
; Jun Toshikawa
; Nobunari Kashikawa
; Yi-Kuan Chiang
; Roderik Overzier
; Hisakazu Uchiyama
; David L. Clements
; David M. Alexander
; Yuichi Matsuda
; Tadayuki Kodama
; Yoshiaki Ono
; Tomotsugu Goto
; Tai-An Cheng
; Kei Ito
; | Date: |
21 Nov 2019 | Abstract: | We perform a stacking analysis of {it Planck}, {it AKARI}, Infrared
Astronomical Satellite ($IRAS$), Wide-field Infrared Survey Eplorer ($WISE$),
and {it Herschel} images of the largest number of (candidate) protoclusters at
$zsim3.8$ selected from the Hyper Suprime-Cam Subaru Strategic Program
(HSC-SSP). Stacking the images of the $179$ candidate protoclusters, the
combined infrared (IR) emission of the protocluster galaxies in the observed
$12-850~mu$m wavelength range is successfully detected with $>5sigma$
significance (at $Planck$). This is the first time that the average IR spectral
energy distribution (SED) of a protocluster has been constrained at $zsim4$.
The observed IR SEDs of the protoclusters exhibit significant excess emission
in the mid-IR compared to that expected from typical star-forming galaxies
(SFGs). They are reproduced well using SED models of intense starburst galaxies
with warm/hot dust heated by young stars, or by a population of active galactic
nuclei (AGN)/SFG composites. For the pure star-forming model, a total IR (from
8 to 1000 $mu$m) luminosity of $19.3_{-4.2}^{+0.6} imes10^{13}~L_{odot}$ and
a star formation rate (SFR) of $16.3_{-7.8}^{+1.0} imes10^3~M_{odot}$
yr$^{-1}$ are found whereas for the AGN/SFG composite model,
$5.1_{-2.5}^{+2.5} imes10^{13}~L_{odot}$ and
$2.1^{+6.3}_{-1.7} imes10^3~M_{odot}$ yr$^{-1}$ are found. Uncertainty
remaining in the total SFRs; however, the IR luminosities of the most massive
protoclusters are likely to continue increasing up to $zsim4$. Meanwhile, no
significant IR flux excess is observed around optically selected QSOs at
similar redshifts, which confirms previous results. Our results suggest that
the $zsim4$ protoclusters trace dense, intensely star-forming environments
that may also host obscured AGNs missed by the selection in the optical. | Source: | arXiv, 1911.9368 | Services: | Forum | Review | PDF | Favorites |
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