2016A&A...596A..75S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.09CEST06:00:51

2016A&A...596A..75S - Astronomy and Astrophysics, volume 596A, 75-75 (2016/12-1)

Characterizing elusive, faint dusty star-forming galaxies: a lensed, optically undetected ALMA galaxy at z∼ 3.3.

SANTINI P., CASTELLANO M., FONTANA A., MERLIN E., MAIOLINO R., MASON C., MIGNANO A., PILO S., AMORIN R., BERTA S., BOURNE N., CALURA F., DADDI E., ELBAZ D., GRAZIAN A., MAGLIOCCHETTI M., MICHALOWSKI M.J., PENTERICCI L., POZZI F., RODIGHIERO G., SCHREIBER C. and VALIANTE R.

Abstract (from CDS):

We present the serendipitous ALMA detection of a faint submillimeter galaxy (SMG) lensed by a foreground z∼1 galaxy. By optimizing the source detection to deblend the system, we accurately build the full spectral energy distribution of the distant galaxy from the I814 band to radio wavelengths. It is extremely red, with a I-K colour larger than 2.5. We estimate a photometric redshift of 3.28 and determine the physical parameters. The distant galaxy turns out to be magnified by the foreground lens by a factor of ∼1.5, which implies an intrinsic Ks-band magnitude of ∼24.5, a submillimeter flux at 870µm of ∼2.5mJy and a SFR of ∼150-300M/yr, depending on the adopted tracer. These values place our source towards the faint end of the distribution of observed SMGs, and in particular among the still few faint SMGs with a fully characterized spectral energy distribution, which allows us not only to accurately estimate its redshift, but also to measure its stellar mass and other physical properties. The galaxy studied in this work is a representative of the population of faint SMGs, of which only few objects are known to date, that are undetected in optical and therefore are not typically accounted for when measuring the cosmic star formation history (SFH). This faint galaxy population thus likely represents an important and missing piece in our understanding of the cosmic SFH. Its observation and characterization is of major importance to achieve a solid picture of galaxy evolution.

Abstract Copyright: © ESO, 2016

Journal keyword(s): galaxies: evolution - galaxies: fundamental parameters - galaxies: high-redshift - galaxies: photometry - submillimeter: galaxies - cosmology: observations

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1281 0
2 QSO B0823+033 BLL 08 25 50.33835429 +03 09 24.5200730   17.81 17.23 16.91   ~ 293 1
3 COSMOS 2593935 G 10 01 38.463 +02 37 34.98 24.26 24.02 23.48 23.18 22.59 ~ 8 0
4 EQ J100138.5+023736.7 G 10 01 38.5470 +02 37 36.700           ~ 1 0
5 QSO J1008+0621 BLL 10 08 00.81616 +06 21 21.2158 17.61 17.17 17.85 16.73   ~ 80 1
6 4C -01.21 QSO 10 10 51.6662737794 -02 00 19.580777388   18.99 18.63 19.1   ~ 67 1
7 QSO B1034-293 QSO 10 37 16.07973476 -29 34 02.8133345   16.46 16.46 17.54   ~ 269 1
8 4C 01.28 BLL 10 58 29.60520747 +01 33 58.8237691   18.74 18.28 16.68   ~ 645 2

    Equat.    Gal    SGal    Ecl

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2020.07.09-06:00:51

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