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J/MNRAS/460/1131   Selection function of Milky Way field stars (Stonkute+, 2016)

The Gaia-ESO Survey: the selection function of the Milky Way field stars. Stonkute E., Koposov S.E., Howes L.M., Feltzing S., Worley C.C., Gilmore G., Ruchti G.R., Kordopatis G., Randich S., Zwitter T., Bensby T., Bragaglia A., Smiljanic R., Costado M.T., Tautvaisiene G., Casey A.R., Korn A.J., Lanzafame A.C., Pancino E., Franciosini E., Hourihane A., Jofre P., Lardo C., Lewis J., Magrini L., Monaco L., Morbidelli L., Sacco G.G., Sbordone L. <Mon. Not. R. Astron. Soc., 460, 1131-1146 (2016)> =2016MNRAS.460.1131S (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Surveys ; Populations, stellar Keywords: techniques: spectroscopic - surveys - stars: general - Galaxy: evolution Abstract: The Gaia-ESO Survey was designed to target all major Galactic components (i.e. bulge, thin and thick discs, halo and clusters), with the goal of constraining the chemical and dynamical evolution of the Milky Way. This paper presents the methodology and considerations that drive the selection of the targeted, allocated and successfully observed Milky Way field stars. The detailed understanding of the survey construction, specifically the influence of target selection criteria on observed Milky Way field stars is required in order to analyse and interpret the survey data correctly. We present the target selection process for the Milky Way field stars observed with Very Large Telescope/Fibre Large Array Multi Element Spectrograph and provide the weights that characterize the survey target selection. The weights can be used to account for the selection effects in the Gaia-ESO Survey data for scientific studies. We provide a couple of simple examples to highlight the necessity of including such information in studies of the stellar populations in the Milky Way. Description: The observations are conducted with the FLAMES (Pasquini et al., 2002Msngr.110....1P) at the Very Large Telescope (VLT) array operated by the European Southern Observatory on Cerro Paranal, Chile. FLAMES is a fibre facility of the VLT and is mounted at the Nasmyth A platform of the second Unit Telescope of VLT. In this paper, we present the Gaia-ESO Survey selection function only for the Milky Way field stars observed with the GIRAFFE and UVES spectrographs at VLT, not including the bulge. All targets were selected according to their colours and magnitudes, using photometry from the VISTA Hemisphere Survey (VHS; McMahon et al. 2013Msngr.154...35M) and the Two Micron All-Sky Survey (2MASS; Skrutskie et al., 2006, Cat. VII/233). Selected potential target lists were generated at the Cambridge Astronomy Survey Unit (CASU) centre. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 226 330 Main parameters and weights of the targeted and allocated Milky Way fields table5.dat 84 7888 CMD weights of successfully observed stars with GIRAFFE in iDR4 table6.dat 71 1367 CMD weights of successfully observed stars with UVES in iDR4
See also: J/A+A/598/A5 : Gaia-ESO Survey iDR4 calibrators (Pancino+, 2017) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 20 A20 --- Field GES Milky Way field name from CASU (GES_FLD) 22- 23 I2 h RAh Right ascension of GES Milky Way field centre (J2000) 25- 26 I2 min RAm Right ascension of GES Milky Way field centre (J2000) 28- 33 F6.3 s RAs Right ascension of GES Milky Way field centre (J2000) 35 A1 --- DE- Declination sign of GES Milky Way field centre (J2000) 36- 37 I2 deg DEd Declination of GES Milky Way field centre (J2000) 39- 40 I2 arcmin DEm Declination of GES Milky Way field centre (J2000) 42- 46 F5.2 arcsec DEs Declination of GES Milky Way field centre (J2000) 48- 52 F5.3 mag E(B-V) Galactic dust extinction median value measured from the Schlegel, Finkbeiner & Davis (1998ApJ...500..525S) maps 54- 58 F5.3 --- DG ?=- Right-edge limit of second priority targets for GIRAFFE (ΔG) 60- 64 F5.3 --- DU ?=- Right-edge limit of second priority targets for UVES (ΔU) 66- 70 F5.3 --- WTFbG ?=- Weight of blue box for GIRAFFE (1) 72- 76 F5.3 --- WTFb1G ?=- Weight of blue box with J1 for GIRAFFE (1) 78- 82 F5.3 --- WTFb2G ?=- Weight of blue box with J2 for GIRAFFE (1) 84- 88 F5.3 --- WTFb3G ?=- Weight of blue box with J3 for GIRAFFE (1) 90- 94 F5.3 --- WTFb4G ?=- Weight of blue box with J4 for GIRAFFE (1) 96-100 F5.3 --- WTFrG ?=- Weight of red box for GIRAFFE (1) 102-106 F5.3 --- WTFeG ?=- Weight of extra red box for GIRAFFE (1) 108-112 F5.3 --- WATbG ?=- Weight of blue box for GIRAFFE (2) 114-118 F5.3 --- WATb1G ?=- Weight of blue box with J1 for GIRAFFE (2) 120-124 F5.3 --- WATb2G ?=- Weight of blue box with J2 for GIRAFFE (2) 126-130 F5.3 --- WATb3G ?=- Weight of blue box with J3 for GIRAFFE (2) 132-136 F5.3 --- WATb4G ?=- Weight of blue box with J4 for GIRAFFE (2) 138-142 F5.3 --- WATrG ?=- Weight of red box for GIRAFFE (2) 144-148 F5.3 --- WATeG ?=- Weight of extra box for GIRAFFE (2) 150-154 F5.3 --- WTFbU ?=- Weight of blue box for UVES (1) 156-160 F5.3 --- WTFb1U ?=- Weight of blue box with J1 for UVES (1) 162-166 F5.3 --- WTFb2U ?=- Weight of blue box with J2 for UVES (1) 168-172 F5.3 --- WTFb3U ?=- Weight of blue box with J3 for UVES (1) 174-178 F5.3 --- WTFb4U ?=- Weight of blue box with J4 for UVES (1) 180-184 F5.3 --- WTFeU ?=- Weight of extra box for UVES (1) 186-190 F5.3 --- WATbU ?=- Weight of blue box for UVES (2) 192-196 F5.3 --- WATb1U ?=- Weight of blue box with J1 for UVES (2) 198-202 F5.3 --- WATb2U ?=- Weight of blue box with J2 for UVES (2) 204-208 F5.3 --- WATb3U ?=- Weight of blue box with J3 for UVES (2) 210-214 F5.3 --- WATb4U ?=- Weight of blue box with J4 for UVES (2) 216-220 F5.3 --- WATeU ?=- Weight of extra box for UVES (2) 222-226 F5.3 % BlueFract Approximate fraction of targets in the blue versus the red box
Note (1): where targeted star counts are versus star counts in 1°FoV. Note (2): where allocated star counts are versus targeted star counts.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 16 A16 --- CName CNAME (HHMMSSss+DDMMSSs, J2000) 18- 37 A20 --- Field GES field (GES_FLD) 39- 46 F8.4 deg RAdeg Right ascension (J2000) 48- 55 F8.4 deg DEdeg Declination (J2000) 57- 65 F9.7 --- WOFG Weight of a successfully observed target in each CMD bin 67- 75 F9.7 --- WTotG Total Weight 77- 84 A8 --- Box Box (Blue or Red/Blue)
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 16 A16 --- CName CNAME (HHMMSSss+DDMMSSs, J2000) 18- 37 A20 --- Field GES field (GES_FLD) 39- 46 F8.4 deg RAdeg Right ascension (J2000) 48- 55 F8.4 deg DEdeg Declination (J2000) 57- 63 F7.5 --- WOFU Weight of a successfully observed target in each CMD bin 65- 71 F7.5 --- WTotU Total Weight
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 06-Oct-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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