J/A+A/549/A63 GMASS photometry (Kurk+, 2013)
GMASS ultradeep spectroscopy of galaxies at z∼2.
VII. Sample selection and spectroscopy.
Kurk J., Cimatti A., Daddi E., Mignoli M., Pozzetti L., Dickinson M.,
Bolzonella M., Zamorani G., Cassata P., Rodighiero G., Franceschini A.,
Renzini A., Rosati P., Halliday C., Berta S.
<Astron. Astrophys. 549, A63 (2013)>
=2013A&A...549A..63K 2013A&A...549A..63K
ADC_Keywords: Galaxies, photometry ; Redshifts ; Spectroscopy
Keywords: galaxies: distances and redshifts - galaxies: evolution -
galaxies: formation - galaxies: fundamental parameters -
galaxies: high-redshift
Abstract:
We designed a spectroscopic observing campaign of a sample of both
massive, quiescent and star-forming galaxies at z>1.4, called Galaxy
Mass Assembly ultra-deep Spectroscopic Survey (GMASS). To determine
redshifts and physical properties, such as metallicity, dust content,
dynamical masses, and star formation history, we performed ultra-deep
spectroscopy with the red-sensitive optical spectrograph FORS2 at the
VLT. Our sample consists of objects, within the CDFS/GOODS area,
detected at 4.5 micron, to be sensitive to stellar mass rather than
star formation intensity. The spectroscopic targets were selected with
a photometric redshift constraint (z>1.4) and magnitude constraints
(B(AB)<26, I(AB)<26.5), which should ensure that these are faint,
distant, and fairly massive galaxies. Up to 30 hours of spectroscopy
of 174 spectroscopic targets and 70 additional objects enabled us to
determine 210 redshifts, of which 145 are at z>1.4. We publicly
release the redshifts and reduced spectra.
Description:
Properties of objects observed in the GMASS masks, including the GMASS
identification number, coordinates, photometry in four bands,
redshifts determined from spectroscopy, average S/N per pixel in
spectrum, photometric normalisation factor to obtain imaging flux,
sample of which the target is part and mask(s) in which the target was
observed.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 149 239 Properties of objects observed in the GMASS masks
fits/* . 329 FITS spectra
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Description of files: fits/*
The fits files containing one-dimensional spectrum obtained for
a certain object in a single mask are formatted as Gxxxx_cn.fits where
G: GMASS
xxxx: object number (see table A1)
c: mask color; b for blue (300V grism), r for red (300I grism)
n: mask number; from 1 to 6
Objects observed in multiple masks occur multiple times.
The fits files containing co-added one-dimensional spectra of those
objects observed in multiple masks are formatted as
Gxxxx_cc.fits (for objects observed in two masks) or
Gxxxx_ccc.fits (for objects observed in three masks).
Two fits files contain de-redshifted spectra
composed of galaxies observed in blue (300V grism) or red (300I grism)
masks, respectively. The spectra are shown in Fig. 7 of the paper.
The file names are formatted as Gcompc.fits where
G: GMASS
comp: composite spectrum
c: mask color; b for blue (300V grism), r for red (300I grism)
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- GMASS GMASS identification number
6 I1 h RAh Right ascension (J2000.0)
8- 9 I2 min RAm Right ascension (J2000.0)
11- 15 F5.2 s RAs Right ascension (J2000.0)
17 A1 --- DE- Declination sign (J2000.0)
18- 19 I2 deg DEd Declination (J2000.0)
21- 22 I2 arcmin DEm Declination (J2000.0)
24- 27 F4.1 arcsec DEs Declination (J2000.0)
29- 33 F5.2 mag B435 ?=- AB magnitude in ACS B(435nm) band
35- 38 F4.2 mag e_B435 ?=- AB magnitude rms uncertainty on B435
40- 44 F5.2 mag i775 ?=- AB magnitude in ACS i(775nm) band
46- 49 F4.2 mag e_i775 ?=- AB magnitude rms uncertainty on i775
51- 55 F5.2 mag Ksmag ?=- AB magnitude in ISAAC Ks band
57- 60 F4.2 mag e_Ksmag ?=- AB magnitude rms uncertainty on Ksmag
62- 66 F5.2 mag [4.5] ?=- AB magnitude in Spitzer/IRAC 4.5um band
68- 71 F4.2 mag e_[4.5] ?=- AB magnitude rms uncertainty on [4.5]
73- 78 F6.4 --- zsp ?=- Spectroscopic redshift
80- 85 F6.4 --- e_zsp ?=- Spectroscopic redshift error
87- 88 I2 --- q_zsp [-1/1] Quality of spectroscopic redshift:
1=good, 0=plausible, -1=guess or no redshift
90- 95 F6.1 --- S/N ?=- Mean signal-to-noise per pixel in spectrum
97-100 F4.1 --- Norm Normalisation needed to obtain imaging flux
102-106 A5 --- Sample Sample(s) to which target belongs (Table 1)
108-112 A5 --- Mask Mask(s) in which target was observed
(Table 2) (2)
114-121 A8 --- File1 Name of the first fits spectrum in
subdirectory fits
123-130 A8 --- File2 Name of the second fits spectrum in
subdirectory fits
132-139 A8 --- File3 Name of the third fits spectrum in
subdirectory fits
141-149 A9 --- File4 Name of the fits multi-spectra, if more than
one, in subdirectory fits
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Note (2): Mask number as follows:
1 = r band
2 = b band
3 = b band
4 = b band
5 = r band
6 = r band
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Acknowledgements:
Jaron Kurk, Max Planck Institute for Extraterrestrial Physic,
kurk(at)mpe.mpg.de
References:
Halliday et al., Paper I 2008A&A...479..417H 2008A&A...479..417H
Cimatti et al., Paper II 2008A&A...482...21C 2008A&A...482...21C
Cimatti et al., Paper III 2008A&A...483L..39C 2008A&A...483L..39C
Noll et al., Paper IV 2009A&A...499...69N 2009A&A...499...69N
Kurk et al., Paper V 2009A&A...504..331K 2009A&A...504..331K
Talia et al., Paper VI 2012A&A...539A..61T 2012A&A...539A..61T
(End) Jaron Kurk [Max Planck Inst.], Patricia Vannier [CDS] 15-Oct-2012