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ALMA Census of Faint 1.2 mm Sources Down to ~0.01 mJy: Extragalactic Background Light and Dust-Poor High-z Galaxies | Seiji Fujimoto
; Masami Ouchi
; Yoshiaki Ono
; Takatoshi Shibuya
; Masafumi Ishigaki
; Rieko Momose
; | Date: |
13 May 2015 | Abstract: | We present statistics of 89 faint 1.2-mm continuum sources with a flux
density of ~0.01-1 mJy detected by about 100 deep ALMA pointing data that
include the complete deep datasets archived by 2015 March. These faint sources
are identified in 50 blank fields and behind one cluster, Abell 1689, that
magnifies the background sources by gravitational lensing. Evaluating various
important effects including the false detection, detection completeness, and
flux boosting as well as the lensing magnification by modeling and simulations,
we derive number counts of 1.2 mm continuum sources. We find that the number
counts are well represented by the Schechter function down to ~0.01 mJy, and
that the total integrated 1.2 mm flux of the securely identified sources is
22.8^(+6.1)_(-6.4) Jy deg^(-2) that corresponds to 104^(+27)_(-30)% of the
extragalactic background light (EBL) measured by COBE observations. These
results suggest that the major 1.2 mm EBL contributors are sources with >~0.01
mJy, and that very faint 1.2 mm sources with <~ 0.01 mJy contribute negligibly
to the EBL with the possible flattening and/or truncation of number counts in
this very faint flux regime. To understand the physical origin of our faint
ALMA sources, we measure the galaxy bias bg by the counts-in-cells technique
under the assumption that the sources reside at z~2.5, and place a stringent
upper limit of bg<4.1 that is not similar to bg values of massive DRGs and SMGs
but comparable to those of UV-bright sBzKs and LBGs. Moreover, in optical and
near-infrared (NIR) deep fields, we identify optical-NIR counterparts for 54%
of our faint ALMA sources, majority of which have luminosities and colors same
as sBzKs and LBGs. We thus conclude that about a half of our faint ALMA sources
are dust-poor high-z galaxies as known as sBzKs and LBGs in optical studies. | Source: | arXiv, 1505.3523 | Services: | Forum | Review | PDF | Favorites |
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