J/ApJ/697/1410 Lyman break galaxies at z∼1.8-2.8 (Ly+, 2009)
Lyman break galaxies at z ∼ 1.8-2.8: GALEX/NUV imaging of the Subaru Deep Field.
Ly C., Malkan M.A., Treu T., Woo J.-H., Currie T., Hayashi M.,
Kashikawa N., Motohara K., Shimasaku K., Yoshida M.
<Astrophys. J., 697, 1410-1432 (2009)>
=2009ApJ...697.1410L 2009ApJ...697.1410L
ADC_Keywords: Galaxies, photometry ; Redshifts ; Spectroscopy
Keywords: galaxies: evolution - galaxies: high-redshift - galaxies: luminosity
function, mass function - galaxies: photometry
Abstract:
A photometric sample of ∼8000 V<25.3 candidate Lyman break galaxies
(LBGs) has been selected by combining Subaru/Suprime-Cam BVRCi'z'
optical data with deep GALEX/NUV imaging of the Subaru Deep Field.
Follow-up spectroscopy confirmed 24 LBGs at 1.5≲z≲2.7. Among the
optical spectra, 12 have Lyα emission with rest-frame equivalent
widths of ∼5-60Å. The success rate for identifying LBGs as
NUV-dropouts at 1.5<z<2.7 is 86%. The rest-frame UV (1700Å)
luminosity function (LF) is constructed from the photometric sample
with corrections for stellar contamination and z<1.5 interlopers
(lower limits). The LF is 1.7±0.1 (1.4±0.1 with a hard upper limit
on stellar contamination) times higher than those of z∼2 BXs and z∼3
LBGs.
Description:
The Subaru Deep Field (SDF; Kashikawa et al. 2004PASJ...56.1011K 2004PASJ...56.1011K),
centered at RA=13h24m38.9s, DE=+27°29'25.9", is a deep wide-field
(857.5arcmin2) extragalactic survey with optical data obtained from
Suprime-Cam mounted on the Subaru Telescope. It was imaged with GALEX
in the NUV(1750-2750Å) between 2005 March 10 and 2007 May 29
(GI1-065) with a total integration time of 138176s.
The Keck Low-Resolution Imaging and Spectrograph (LRIS) was used to
target candidate LBGs in multislit mode on 2007 January 23-25.
Spectra of NUV-dropouts from the final photometric catalog were
obtained with the multifiber optical spectrograph Hectospec on the
6.5m MMT on 2008 March 13 and April 10, 11, and 14.
Spectra of BzKs were obtained on 2007 May 3-4 with Subaru using the
Multi-Object Infrared Camera and Spectrograph (MOIRCS).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 130 75 Properties of spectroscopically targeted
NUV-dropouts and BzKs
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See also:
B/subaru : Log of Subaru Prime Focus Camera Exposures (ADAC NAOJ, 2007)
J/MNRAS/401/1521 : Stellar masses of Lyman break galaxies at z∼3 (Magdis+,
2010)
J/MNRAS/380/986 : Lyman-break galaxies from GALEX (Burgarella+, 2007)
J/ApJ/657/738 : SDF galaxies multi-photometry (Ly+, 2007)
J/PASJ/58/313 : Lyα emitters in the SUBARU Deep Field (Shimasaku+,
2006)
J/PASJ/57/165 : Lyα emitters in the SUBARU Deep Field (Taniguchi+,
2005)
J/ApJ/592/728 : Lyman break galaxies at redshift z∼3 (Steidel+, 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Sample Sample (1)
7- 13 A7 --- B-ID B-band catalog from SExtractor
identification (2)
15- 32 A18 --- Name SDF name (HHMMSS.s+DDMMSS.ss; J2000)
34 A1 --- l_NUV-B Limit flag on NUV-B
35- 39 F5.3 mag NUV-B NUV-B band color index
41- 46 F6.3 mag B-V B-V color index
48 A1 --- l_NUV Limit flag on NUV
49- 54 F6.3 mag NUV GALEX NUV AB magnitude
56- 61 F6.3 mag Bmag Subaru B-band AB magnitude
63- 68 F6.3 mag Vmag Subaru V-band AB magnitude
70- 75 F6.3 mag Rcmag Subaru Rc band AB magnitude
77- 82 F6.3 mag i'mag Subaru i'-band AB magnitude
84- 89 F6.3 mag z'mag Subaru z'-band AB magnitude
91- 97 F7.4 --- z ? Cross-correlated redshift
99 A1 --- f_z [d] low S/N (3)
101-105 F5.2 --- R ? Cross-correlation signal to noise
107-116 A10 --- Temp Template yielding the highest R value (4)
118-122 F5.1 zW/m2 F(Lya) ? Lyα line flux (in units of
10-18erg/s/cm2 = 10-21W/m2)
123 A1 --- f_F(Lya) [c] Flag on F(Lya) (5)
125-129 F5.2 0.1nm EW0 ? Lyα equivalent width
130 A1 --- f_EW0 [c] u,nusual Lyα profile (5)
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Note (1): Sample as follows:
ELS = With emission lines
ALS = Absorption line systems
Z>1.5 = z>1.5 interlopers and stars
Amb = Ambiguous NUV-dropouts
Und = Undetected NUV-dropouts
Note (2): Identified sources are based on an R>3.0 criterion (exceptions
are AGNs, stars, and those with emission lines). The character
following the ID number corresponds to the spectrograph used:
"H" = Hectospec, "L" = LRIS, "M" = MOIRCS.
Note (3): d = The values reported here correspond to the best cross-correlated
results, but may be wrong due to the low S/N of the spectra.
Note (4):
* the values 1 to 4 correspond to the four spectra of Steidel et al.
(2003, Cat. J/ApJ/592/728) from strongest Lyα absorption to
emission;
* the values 5 and 6 refer to the Shapley et al. (2003ApJ...588...65S 2003ApJ...588...65S)
composite and cB58 spectra (spectra of MS 1512-cB58 from Pettini et al.
2000ApJ...528...96P 2000ApJ...528...96P), respectively.
* the value 7 corresponds to the rest-frame NUV spectra from Savaglio
et al. (2004ApJ...602...51S 2004ApJ...602...51S), and "AGN" refers to a SDSS QSO template.
* For interlopers, the six SDSS composite spectra presented in Yip et al.
(2004AJ....128..585Y 2004AJ....128..585Y) correspond to [1] to [6] from strongest
absorption-line to strongest emission-line systems. [7], [8],
and [9] correspond to the rvsao templates "femtemp," "EA," and
"eatemp," respectively.
Note (5):
c = As discussed in the Appendix, this source shows an unusual Lyα
profile, so the reported flux and rest-frame EW excluded the blue
excess by deblending in IRAF splot.
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Nomenclature Notes:
Table 1: galaxies are <[LMT2009] SDF JHHMMSS.s+DDMMSS.ss> in Simbad.
History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 31-May-2011