J/A+A/563/A142 UGR photometry of LBG candidates at z∼3 (Boutsia+, 2014)
Deep R-band counts of z∼3 Lyman-break galaxy candidates with the LBT.
Boutsia K., Grazian A., Giallongo E., Castellano M., Pentericci L.,
Fontana A., Fiore F., Gallozzi S., Cusano F., Paris D., Speziali R.,
Testa V.
<Astron. Astrophys. 563, A142 (2014)>
=2014A&A...563A.142B 2014A&A...563A.142B
ADC_Keywords: Galaxy catalogs ; Galaxies, photometry ; Galaxies, optical
Keywords: surveys - catalogs - galaxies: high-redshift - galaxies: photometry -
ultraviolet: galaxies
Abstract:
We present a deep multi wavelength imaging survey (UGR) in 3 different
fields, Q0933, Q1623 and COSMOS, for a total area of ∼1500arcmin2
The data were obtained with the Large Binocular Camera on the Large
Binocular Telescope.
To select our LBG candidates we adopt the well established and widely
used color selection criterion (U-G vs. G-R). One of the main
advantages of our survey is that it has a wider dynamic color range
for U drop-out selection compared to previous studies. This allows us
to fully exploit the depth of our R band images, obtaining a robust
sample with few interlopers. In addition, for 2 of our fields we have
spectroscopic redshift information that is necessary to better
estimate the completeness of our sample and interloper fraction.
Our limiting magnitudes reach 27.0(AB) in the R band (5σ) and
28.6(AB) in the U band (1σ). This dataset was used to derive
Lyman Break Galaxy candidates at z∼3. We obtained a catalog with a
total of 12264 sources down to the 50% completeness magnitude limit in
the R band for each field. We find a surface density of ∼3 LBG
candidates arcmin-2 down to R=25.5, where completeness is ≥95% for
all 3 fields. This number is higher than the original studies, but
consistent with more recent samples.
Description:
The following multiwavelength catalogs provide photometric information
for 12264 Lyman Break Galaxy candidates identified through the UGR
color-color selection criterion in three separate fields: Q1623,
COSMOS and Q0933. Photometry has been obtained with the Large
Binocular Camera on LBT. More specifically, we provide the LBG
candidates catalog in each field, down to the 50% completeness limit
in the R band. The magnitudes presented have been calculated using the
R-band as the detection image and for the other two bands (G and U),
we report the corrected aperture magnitudes, derived in dual-mode
photometry. For each magnitude we also report the associated error.
Negative magnitude values indicate upper limits at 1σ. For the
R-band, where the sources were detected, we also present S/N estimate,
the measured fwhm in arcsecs and the morphological class attributed to
the source by SExtractor, with values closer to zero indicating an
extended morphology.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 82 5451 Multiwavelength catalog of Lyman Break Galaxy
candidates in the Q1623 field
tablea2.dat 82 4069 Multiwavelength catalog of Lyman Break Galaxy
candidates in the COSMOS field
tablea3.dat 82 2744 Multiwavelength catalog of Lyman Break Galaxy
candidates in the Q0933 field
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See also:
J/ApJ/519/1 : Lyman-break galaxies at z≳4 (Steidel+, 1999)
J/ApJ/592/728 : Lyman break galaxies at redshift z∼3 (Steidel+, 2003)
J/ApJ/697/1410 : Lyman break galaxies at z∼1.8-2.8 (Ly+, 2009)
J/ApJ/703/2033 : Lyman-break galaxies (LBG) in the HUDF (Rafelski+, 2009)
J/ApJ/736/48 : Lyman break galaxies at z∼3 in HUDF (Rafelski+, 2011)
J/MNRAS/380/986 : Lyman-break galaxies from GALEX (Burgarella+, 2007)
J/MNRAS/401/1521 : Stellar masses of Lyman break galaxies at z∼3 (Magdis+ 2010)
J/MNRAS/414/28 : VLT Lyman-break galaxy redshift survey. II. (Crighton+ 2011)
Byte-by-byte Description of file: tablea1.dat tablea2.dat tablea3.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq Record number within the original table
7- 18 F12.8 deg RAdeg Right Ascension, in decimal degrees (J2000)
20- 30 F11.8 deg DEdeg Declination, in decimal degrees (J2000)
32- 36 F5.2 mag Rmag R band magnitude, AB system
38- 41 F4.2 mag e_Rmag R band magnitude error
43- 48 F6.2 --- SNR Signal/noise ratio in R band magnitude
measurement
50 A1 --- l_Umag [-] Limit flag on Umag (upper limit)
51- 55 F5.2 mag Umag U band magnitude, AB system
57- 60 F4.2 mag e_Umag U band magnitude error
62- 66 F5.2 mag Gmag G band magnitude, AB system
68- 71 F4.2 mag e_Gmag G band magnitude error
73- 77 F5.2 arcsec FWHM Estimated FWHM of the source
79- 82 F4.2 --- S/G [0/1] Star/galaxy classification,
stellarity index (1=stellar)
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Acknowledgements:
Konstantina Boutsia, konstantina.boutsia(at)oa-roma.inaf.it
(End) Konstantina Boutsia [INAF-OAR, Italy], Patricia Vannier [CDS] 20-Nov-2013