J/A+A/562/A66 GIRAFFE Inner Bulge Survey (GIBS). I. (Zoccali+, 2014)
The GIRAFFE Inner Bulge Survey (GIBS).
I. Survey Description and a kinematical map of the Milky Way bulge.
Zoccali M., Gonzalez O.A., Vasquez S., Hill V., Rejkuba M., Valenti E.,
Renzini A., Rojas-Arriagada A., Martinez-Valpuesta I., Babusiaux C.,
Brown T., Minniti D., McWilliam A.
<Astron. Astrophys. 562, A66 (2014)>
=2014A&A...562A..66Z 2014A&A...562A..66Z
ADC_Keywords: Milky Way ; Radial velocities
Keywords: Galaxy: bulge - Galaxy: structure - Galaxy: evolution -
Galaxy: formation - Galaxy: kinematics and dynamics
Abstract:
The Galactic bulge is a massive, old component of the Milky Way. It is
known to host a bar, and it has recently been demonstrated to have a
pronounced boxy/peanut structure in its outer region. Several
independent studies suggest the presence of more than one stellar
populations in the bulge, with different origins and a relative
fraction changing across the bulge area.
This is the first of a series of papers presenting the results of the
Giraffe Inner Bulge Survey, carried out at the ESO-VLT with the
multifibre spectrograph FLAMES. Spectra of ∼5000 red clump giants in
24 bulge fields have been obtained at resolution R=6500, in the
infrared Calcium triplet wavelength region at ∼8500Å. They are used
to derive radial velocities and metallicities, based on new
calibration specifically devised for this project. Radial velocities
for another ∼1200 bulge red clump giants, obtained from similar
archive data, have been added to the sample. Higher resolution spectra
have been obtained for ∼450 additional stars at latitude b=-3.5, with
the aim of investigating chemical abundance patterns variations with
longitude, across the inner bulge. In total we present here radial
velocities for 6494 red clump stars.
We present here the target selection criteria, observing strategy and
the catalogue with radial velocity measurements for all the target
stars.
Description:
Spectra for the selected targets have been collected with the GIRAFFE
spectrograph fed by MEDUSA fibres (in some cases the observations were
taken in the combined UVES+MEDUSA mode) of the FLAMES multi-fibre
instrument at the ESO Very Large Telescope, between May 2011 and
September 2012. Observations were carried out in service mode under
programme 187.B-0909(A) and 187.B-0909(B), PI: Zoccali.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 95 31 Observed fields, number of target stars and main
characteristics of the spectra
table2.dat 77 6392 Coordinates and radial velocities for all the
program stars
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See also:
J/AJ/110/2788 : JHK photometry for Galactic bulge stars (Tiede+ 1995)
J/MNRAS/348/1439 : OGLE II Galactic center proper motions (Sumi+, 2004)
J/A+A/458/113 : BVRIc phot. towards inner Galactic Bulge (Santiago+, 2006)
J/ApJ/721/L28 : OGLE-III red clump stars in Galactic Bulge (Nataf+, 2010)
J/A+A/534/A91 : Galactic Bulge Valinhos Observatory Catalog (Teixeira+ 2011)
J/A+A/555/A91 : Kinematics and photometry of red clump stars (Vasquez+ 2013)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1 A1 --- f_Field [OA] Observed or Additional fields
3- 13 A11 --- Field Field name
14 A1 --- n_Field [a*] Note on Field (1)
17- 18 I2 h RAh Right ascension (J2000)
20- 21 I2 min RAm Right ascension (J2000)
23- 27 F5.2 s RAs Right ascension (J2000)
29 A1 --- DE- Declination sign (J2000)
30- 31 I2 deg DEd Declination (J2000)
33- 34 I2 arcmin DEm Declination (J2000)
36- 39 F4.1 arcsec DEs Declination (J2000)
41- 48 F8.4 deg GLON Galactic longitude
50- 56 F7.4 deg GLAT Galactic latitude
58- 61 A4 --- Setup Setup
63- 67 I5 --- R ? Spectral resolution (λ/Δλ)
69- 72 I4 0.1nm lam1 [6120/8206]? Wavelength coverage
73 A1 --- --- [-]
74- 77 I4 0.1nm lam2 [6405/9400]? Wavelength coverage
79- 81 I3 --- Ns1 Number of stars observed with GIRAFFE
83- 84 I2 --- Ns2 ? Number of stars observed with UVES
86- 90 I5 s Texp Exposure time/star
91 A1 --- --- [/]
92- 95 I4 s Texp2 ? Exposure time/star
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Note (1): Notes as follows:
* = Baade's window
a = These are the spectra, from GIRAFFE@VLT + IMACS@Magellan,
discussed in Vasquez et al. (2013, Cat. J/A+A/555/A91).
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Field Field name
12- 16 A5 --- --- [GIBS_]
17- 20 A4 --- GIBS Star designation (GIBS_NNNN)
22- 23 I2 h RAh Right ascension (J2000)
25- 26 I2 min RAm Right ascension (J2000)
28- 32 F5.2 s RAs Right ascension (J2000)
34 A1 --- DE- Declination sign (J2000)
35- 36 I2 deg DEd Declination (J2000)
38- 39 I2 arcmin DEm Declination (J2000)
41- 45 F5.2 arcsec DEs Declination (J2000)
47- 55 F9.5 deg GLON Galactic longitude
57- 64 F8.5 deg GLAT Galactic latitude
66- 71 F6.1 km/s RV ?=999.0 Radial velocity
73- 77 F5.1 km/s e_RV ?=999.0 rms uncertainty on RV
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Acknowledgements:
Manuela Zoccali, mzoccali(at)astro.puc.cl
(End) Patricia Vannier [CDS] 16-Jan-2014