J/ApJS/253/4 SuperBoRG: search HST parallel imaging data (Morishita, 2021)
SuperBoRG: search for the brightest of reionizing galaxies and quasars in
HST parallel imaging data.
Morishita T.
<Astrophys. J. Suppl. Ser., 253, 4-4 (2021)>
=2021ApJS..253....4M 2021ApJS..253....4M (SIMBAD/NED BibCode)
ADC_Keywords: Photometry, HST; Surveys
Keywords: High-redshift galaxies; Astronomy data reduction; Quasars; Galaxies
Abstract:
The Hubble Space Telescope (HST) has been providing tremendous survey
efficiency via its pure-parallel mode by observing another field in
parallel with the primary instrument in operation for the primary
observation. In this study, we present a new archival project,
SuperBoRG, which aims at compiling data taken in extragalactic
parallel programs of HST with the Wide Field Camera 3 in the past
decade, including pure-parallel (BoRG, HIPPIES, and COS-GTO) and
coordinated-parallel (CLASH and RELICS) programs. The total effective
area reaches ∼0.41deg2 from 4.1Ms, or 47days, of observing time,
which is the largest collection of optical-to-near-infrared imaging
data of HST for extragalactic science. We reduce all data in a
consistent manner with an updated version of our data reduction
pipeline, including a new sky background subtraction step. When
available, imaging data from the Spitzer Space Telescope are also
included in photometric analyses. The data set consists of 316
independent sight lines and is highly effective for identification of
high-z luminous sources (MUV≲-20mag) at z∼7-12, helping to minimize
the effects of cosmic variance. As a demonstration, we present three
new z≳7 source candidates, including one luminous galaxy candidate at
zphot∼10.4 with MUV~-21.9mag; the best-fit spectral energy
distribution implies a large amount of stellar mass (logM*/M☉∼10)
and moderate dust attenuation (AV∼1.4mag), though the possibility of
it being a low-z interloper cannot be completely rejected (∼23%) with
the current data set. The data set presented in this study is also
suited for intermediate- and low-z science cases.
Description:
In this SuperBoRG project, we collect HST fields from both pure-parallel
and coordinated-parallel programs. The data is available via MAST at
doi:10.17909/t9-m7tx-qb86.
The Brightest of Reionizing Galaxies survey (BoRG) is a series of
pure-parallel imaging programs initiated in 2009
(Trenti+ 2011ApJ...727L..39T 2011ApJ...727L..39T ; 2012ApJ...746...55T 2012ApJ...746...55T and
Bradley+ 2012ApJ...760..108B 2012ApJ...760..108B). These programs were designed to search
for luminous galaxies in the epoch of reionization, namely at z≳7;
thus, the observations were designed to efficiently identify high-z
objects via the Lyman break technique at a medium depth exposure with
WFC3-UVIS and IR filters. Since its initiation, multiple programs have
been awarded (Cycles 17, 19, 22, and 25; PIDs 11700, 12752, 13767, and
15212), and the total number of HST orbits collected in all of the
BoRG programs reaches ∼1400. See Section 2.1.1.
The Hubble Infrared Pure Parallel Imaging Extragalactic Survey
(HIPPIES) is also a series of pure-parallel imaging surveys carried
out in Cycles 17 and 18 (PIDs 11702 and 12286). See Section 2.1.2.
A part of the COS-GTO programs contains parallel imaging observations
with WFC3 (PIDs 11519, 11520, 11524, 11528, 11530, 11533, 11534,
11541, 12036, 12024, and 12025). See Section 2.1.3.
Besides the pure-parallel programs described above, we also include
data sets from two coordinated-parallel programs spanning multiple
fields: CLASH (PID 12065; Postman+ 2012, J/ApJS/199/25) and RELICS
(PID 14096; Coe+ 2019, J/ApJ/888/85). See Section 2.2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 112 316 Limiting magnitudes for the SuperBORG fields
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/AJ/120/2747 : HDF-South WFPC2 observations (Casertano+, 2000)
J/AJ/132/926 : Galaxies in the Hubble Ultra Deep Field (Coe+, 2006)
J/MNRAS/418/2074 : Robust sample of galaxies at 6.0<z<8.7 (Mclure+, 2011)
J/ApJS/199/25 : CLASH sources for MACS1149.6+2223 (Postman+, 2012)
J/ApJS/203/24 : Structural param. of galaxies in CANDELS (van der Wel+, 2012)
J/MNRAS/427/1666 : Massive galaxies in CANDELS-UDS field (Bruce+, 2012)
J/MNRAS/440/2810 : Galaxy luminosity function at z ≃ 7 (Bowler+, 2014)
J/ApJ/788/77 : MW L/T/M-dwarfs identified in BoRG survey (Holwerda+, 2014)
J/ApJ/803/34 : z∼4-10 galaxies from HST legacy fields (Bouwens+, 2015)
J/ApJ/810/71 : UV mag of candidate galaxies at 3~<z~<8.5 (Finkelstein+, 2015)
J/ApJ/812/114 : Grism Lens-Amplified Survey from Space. I. (Treu+, 2015)
J/A+A/590/A31 : ASTRODEEP Frontier Fields Catalogues (Merlin+, 2016)
J/ApJS/224/33 : CLASH-VLT: the FF cluster MACS J0416.1-2403 (Balestra+, 2016)
J/ApJ/835/254 : GLASS. IX. Data from HFF & GLASS (Morishita+, 2017)
J/A+A/619/A136 : VLT/X-SHOOTER spectrum of COLA1 (Matthee+, 2018)
J/ApJ/884/85 : RELICS: Reionization Lensing Cluster Survey (Coe+, 2019)
http://www.stsci.edu/~tmorishita/superborg/ : SuperBoRG home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- Survey Survey identifier
17- 25 A9 --- Field Field identifier (HHMM+DDMM)
27- 35 E9.4 deg RAdeg Right Ascension in decimal degrees (J2000)
37- 46 E10.4 deg DEdeg Declination in decimal degrees (J2000)
48- 52 F5.2 mag F350LP [24.5/28]? HST/WFC3 F350LP band
5σ-limiting magnitude
54- 58 F5.2 mag F600LP [25.2/27.3]? HST/WFC3 F600LP band
5σ-limiting magnitude
60- 64 F5.2 mag F606W [25.8/28.3]? HST/WFC3 F606W band
5σ-limiting magnitude
66- 70 F5.2 mag F814W [24.5/26.6]? HST/WFC3 F814W band
5σ-limiting magnitude
72- 76 F5.2 mag F098M [25.2/28.2]? HST/WFC3 F098M band
5σ-limiting magnitude
78- 82 F5.2 mag F105W [24/27.7]? HST/WFC3 F105W band
5σ-limiting magnitude
84- 88 F5.2 mag F125W [24/28.1]? HST/WFC3 F125W band
5σ-limiting magnitude
90- 94 F5.2 mag F140W [24.1/27.5]? HST/WFC3 F140W band
5σ-limiting magnitude
96- 100 F5.2 mag F160W [23.9/27.6] HST/WFC3 F160W band
5σ-limiting magnitude
102- 106 F5.2 mag IRAC1 [22.8/24.4]? Spitzer/IRAC 3.6 micron band
5σ-limiting magnitude
108- 112 F5.2 mag IRAC2 [22.8/24.4]? Spitzer/IRAC 4.5 micron band
5σ-limiting magnitude
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 28-Apr-2021