V/151 VANDELS High-Redshift Galaxy Evolution (McLure+, 2017)
VANDELS High-Redshift Galaxy Evolution: Spectroscopic and Photometric
Redshifts in the CANDELS UDS and CDFS Fields
McLure R., Pentericci L., VANDELS Team
<The Messenger, vol. 167, 31-35 (2017)>
=2017Msngr.167...31M 2017Msngr.167...31M
=2017yCat.5151....0M 2017yCat.5151....0M
ADC_Keywords: Surveys ; Photometry, SDSS ; Photometry, infrared ; Redshifts
Mission_Name: ESO
Abstract:
VANDELS is a new ESO spectroscopic Public Survey targeting the
high-redshift Universe. Exploiting the red sensitivity of the
refurbished VIMOS spectrograph, the survey is obtaining ultra-deep
optical spectroscopy of around 2100 galaxies in the redshift interval
1.0<z<7.0, with 85% of its targets selected to be at z≥3. The
fundamental aim of the survey is to provide the high signal-to-noise
spectra necessary to measure key physical properties such as stellar
population ages, metallicities and outflow velocities from detailed
absorption-line studies. By targeting two extragalactic survey fields
with superb multi-wavelength imaging data, VANDELS will produce a
unique legacy dataset for exploring the physics underpinning
high-redshift galaxy evolution.
Description:
This is the first data release (DR1) of the VANDELS survey, an ESO
public spectroscopy survey targeting the high-redshift Universe. The
VANDELS survey uses the VIMOS spectrograph on ESO's VLT to obtain
ultra-deep, medium resolution, optical spectra of galaxies within the
UKIDSS Ultra Deep Survey (UDS) and Chandra Deep Field South (CDFS)
survey fields (0.2 sq. degree total area). Using robust photometric
redshift pre-selection, VANDELS is targeting ∼2100 galaxies in the
redshift interval 1.0<z<7.0, with 85% of its targets selected to be at
z≥3. In addition, VANDELS is targeting a substantial number of
passive galaxies in the redshift interval 1.0<z<2.5. Exploiting the
red sensitivity of the refurbished VIMOS spectrograph, the survey is
obtaining ultra-deep optical spectroscopy with the VIMOS MR grism and
GG475 order-sorting filter, which covers the wavelength range
4800-10000Å at a dispersion of 2.5Å/pix and a spectral resolution
of R∼600. Each galaxy receives between a minimum of 20-hours and a
maximum of 80-hours of on-source integration time. The fundamental aim
of the survey is to provide the high signal-to-noise spectra necessary
to measure key physical properties such as stellar population ages,
metallicities and outflow velocities from detailed absorption-line
studies. By targeting two extra-galactic survey fields with superb
multi-wavelength imaging data, VANDELS is designed to produce a unique
legacy dataset for exploring the physics underpinning high-redshift
galaxy evolution.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
cdfs.dat 162 415 VANDELS CDFS field
uds.dat 162 464 VANDELS UDS field
--------------------------------------------------------------------------------
See also:
II/253 : Chandra Deep Field South: multi-colour data (Wolf+, 2008)
J/A+A/377/442 : Chandra Deep Field South: R-band photometry (Wolf+, 2001)
II/258 : Hubble Ultra Deep Field Catalog (UDF) (STScI, 2004)
J/AJ/132/1729 : Hubble Ultra Deep Field BVI-dropout sources (Beckwith+, 2006)
Byte-by-byte Description of file: cdfs.dat uds.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 A19 --- Id VANDELS object name (id) (1)
21- 29 F9.5 deg RAdeg Right ascension (J2000) (alpha)
31- 39 F9.5 deg DEdeg Declination (J2000) (delta)
41- 47 F7.4 mg imag ? i (AB) selection magnitude (i_AB)
49- 60 A12 --- iFilt i (AB) selection magnitude filter (i_FILTER)(2)
62- 68 F7.4 mg zmag ? z (AB) selection magnitude (z_AB)
70- 79 A10 --- zFilt z (AB) selection magnitude filter (z_FILTER)(3)
81- 87 F7.4 mg Hmag ? H (AB) selection magnitude (H_AB)
89- 97 A9 --- HFilt H (AB) selection magnitude filter (H_FILTER)(4)
99-104 I6 s Schedtime Total requested exposure time (t_schedtime)
106-119 F14.7 s Exptime Current total exposure time (t_exptime)
121-127 F7.5 --- zph Photometric redshift (zphot)
129-134 F6.4 --- zsp ? Spectroscopic redshift (zspec)
136-137 I2 --- q_zsp ? Spectroscopic redshift quality flag (zflg) (5)
139-162 A24 --- FileName FITS file name of the original spectrum
(FILENAME)
--------------------------------------------------------------------------------
Note (1): VANDELSCDFSNNNNNN for CDFS field, VANDELSUDSNNNNNN for UDF field.
Note (2): HST_F775W and SUBARU_IA738 for CDFS field, SUBARU_i' for UDF field.
Note (3): HST_F850LP for CDFS field, SUBARU_z' for CDFS field.
Note (4): HST_F160W and VISTA_H for CDFS field,
HST_F160W and WFCAM_H for UDF field.
Note (5): Spectroscopic redshift quality flag as follows:
0 = no redshift could be assigned
1 = 50% probability to be correct
2 = 75% probability to be correct
3 = 95% probability to be correct
4 = 100% probability to be correct
9 = spectrum with a single emission line. The redshift given is the most
probable given the observed continuum, it has a >80% probability to
be correct
14 = 100% probability to be correct from AGN spectrum
--------------------------------------------------------------------------------
History:
Copied at http://www.eso.org/qi/catalog/show/212
(End) Patricia Vannier [CDS] 21-Nov-2017