2014ApJ...785..108B


Query : 2014ApJ...785..108B

2014ApJ...785..108B - Astrophys. J., 785, 108 (2014/April-3)

Spitzer ultra faint SUrvey program (SURFS UP). I. An overview.

BRADAC M., RYAN R., CASERTANO S., HUANG K.-H., LEMAUX B.C., SCHRABBACK T., GONZALEZ A.H., ALLEN S., CAIN B., GLADDERS M., HALL N., HILDEBRANDT H., HINZ J., VON DER LINDEN A., LUBIN L., TREU T. and ZARITSKY D.

Abstract (from CDS):

Spitzer UltRa Faint SUrvey Program is a joint Spitzer and Hubble Space Telescope Exploration Science program using 10 galaxy clusters as cosmic telescopes to study z ≳ 7 galaxies at intrinsically lower luminosities, enabled by gravitational lensing, than blank field surveys of the same exposure time. Our main goal is to measure stellar masses and ages of these galaxies, which are the most likely sources of the ionizing photons that drive reionization. Accurate knowledge of the star formation density and star formation history at this epoch is necessary to determine whether these galaxies indeed reionized the universe. Determination of the stellar masses and ages requires measuring rest-frame optical light, which only Spitzer can probe for sources at z ≳ 7, for a large enough sample of typical galaxies. Our program consists of 550 hr of Spitzer/IRAC imaging covering 10 galaxy clusters with very well-known mass distributions, making them extremely precise cosmic telescopes. We combine our data with archival observations to obtain mosaics with ∼30 hr exposure time in both 3.6 µm and 4.5 µm in the central 4'x4' field and ∼15 hr in the flanking fields. This results in 3σ sensitivity limits of ∼26.6 and ∼26.2 AB magnitudes for the central field in the IRAC 3.6 and 4.5 µm bands, respectively. To illustrate the survey strategy and characteristics we introduce the sample, present the details of the data reduction and demonstrate that these data are sufficient for in-depth studies of z ≳ 7 sources (using a z = 9.5 galaxy behind MACS J1149.5+2223 as an example). For the first cluster of the survey (the Bullet Cluster) we have released all high-level data mosaics and IRAC empirical point-spread function models. In the future we plan to release these data products for the entire survey.

Abstract Copyright:

Journal keyword(s): dark ages, reionization, first stars - galaxies: clusters: individual - galaxies: high-redshift - gravitational lensing: strong

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1384 0
2 ClG 0451-03 ClG 04 54 10.9 -03 01 07     20.0     ~ 334 0
3 ClG 0657-56 ClG 06 58 29.6 -55 56 39           ~ 839 1
4 B3 0714+378 Rad 07 17 36.50 +37 45 23.0           ~ 169 2
5 ClG J0717+3745 ClG 07 17 36.50 +37 45 23.0           ~ 387 0
6 ClG J0744+3927 ClG 07 44 52.5 +39 27 30           ~ 166 0
7 MCS J1149.5+2223 ClG 11 49 35.8 +22 23 55           ~ 351 0
8 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4374 2
9 NAME SHAPLEY-CENTAURUS CL SCG 13 06.0 -33 04           ~ 531 0
10 ClG J1347-1145 ClG 13 47 33.5 -11 45 42           ~ 491 0
11 ClG J1423+2404 ClG 14 23 47.7 +24 04 40           ~ 184 0
12 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 784 1
13 ClG J2129-0741 ClG 21 29 26.0 -07 41 28           ~ 144 0
14 RXC J2214.9-1400 ClG 22 14 57.3 -14 00 12           ~ 74 0
15 RCS J2327-0204 ClG 23 27 27.60 -02 04 37.4           ~ 32 0

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2021.07.31-10:58:47

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