J/A+A/609/A53 Tracing stars of MW dwarf galaxies: Sextans (Cicuendez+, 2018)
Tracing the stellar component of low surface brightness Milky Way dwarf galaxies
to their outskirts. I: Sextans.
Cicuendez L., Battaglia G., Irwin M., Bermejo-Climent J.R., McMonigal B.,
Bate N.F., Lewis G.F., Conn A.R., de Boer T.J.L., Gallart C., Guglielmo M.,
Ibata R., McConnachie A., Tolstoy E., Fernando N.
<Astron. Astrophys. 609, A53 (2018)>
=2018A&A...609A..53C 2018A&A...609A..53C (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Galaxies, photometry ; Photographic catalog ;
Spectroscopy ; Radial velocities ; Abundances, [Fe/H] ;
Equivalent widths
Keywords: galaxies: individual: Sextans dSph - galaxies: dwarf - Local Group -
galaxies: structure - galaxies: statistics - dark matter
Abstract:
We present a deep and very spatially extended CTIO/DECam g and r
photometric catalogue of point-sources (reaching out to
∼2 magnitudes below the oldest main-sequence turn-off and covering
∼20deg2) around the Sextans dwarf spheroidal galaxy, together with
another catalogue of literature spectroscopic measurements (Walker et
al., 2009, Cat. J/AJ/137/3100 and Battaglia et al., 2011, Cat.
J/MNRAS/411/1013) with updated membership probabilities.
Description:
The observations took place between March 18 and 23 2015 in visitor
mode with the instrument DECam on the 4m Blanco telescope at the CTIO
(PI: B. McMonigal). DECam is a widefield CCD imager containing 62
2048x4096 pixel CCDs, producing images with a field of view of
2.2-degrees at 0.263-arcsecond/pixel resolution.
We refer the reader to the associated manuscript for the complete
description of the observations, data reduction, target selection and
assigned membership probabilities.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 72 602019 CTIO/DECam g and r photometric Data
table6.dat 131 1595 MMFS + VLT/FLAMES spectroscopic data
--------------------------------------------------------------------------------
See also:
J/AJ/137/3100 : Radial velocities of 4 dSph galaxies (Walker+, 2009)
J/MNRAS/411/1013 : CaII triplet in Sextans dSph galaxy (Battaglia+, 2011)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- Seq [1/602019] Sequential number
8- 9 I2 h RAh Right ascension (J2000)
11- 12 I2 min RAm Right ascension (J2000)
14- 20 F7.4 s RAs Right ascension (J2000)
22 A1 --- DE- Declination sign (J2000)
23 I1 deg DEd Declination (J2000)
25- 26 I2 arcmin DEm Declination (J2000)
28- 33 F6.3 arcsec DEs Declination (J2000)
35- 40 F6.3 mag gmag Apparent g band magnitude in SDSS system
42- 46 F5.3 mag e_gmag Uncertainty in gmag
48- 49 I2 --- f_gmag [-3/-1] Morphological classification flag
in g band (1)
51- 56 F6.3 mag rmag Apparent r band magnitude in SDSS system
58- 62 F5.3 mag e_rmag Uncertainty in rmag
64- 65 I2 --- f_rmag [-3/-1] Morphological classification flag
in r band (1)
67- 72 F6.4 mag E(B-V) Reddening
--------------------------------------------------------------------------------
Note (1): Flags as follow:
-1 = almost certain star
-2 = probable star
-3 = star/compact galaxy
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq [1/1595] Sequential number
6- 7 I2 h RAh Right ascension (J2000)
9- 10 I2 min RAm Right ascension (J2000)
12- 16 F5.2 s RAs Right ascension (J2000)
18 A1 --- DE- Declination sign
19 I1 deg DEd Declination (J2000)
21- 22 I2 arcmin DEm Declination (J2000)
24- 27 F4.1 arcsec DEs Declination (J2000)
29- 34 F6.2 km/s HVB11 ? Heliocentric radial velocity in
Battaglia et al., 2011, J/MNRAS/411/1013
36- 39 F4.2 km/s e_HVB11 ? Uncertainty in HVB11
41- 46 F6.3 0.1nm EWMg ? Equivalent width of the MgI line
48- 55 F8.6 0.1nm e_EWMg ? Uncertainty in EWMg
57- 65 F9.6 0.1nm [Fe/H] ? Metallicity (1)
67- 74 F8.6 0.1nm e_[Fe/H] ? Error in [Fe/H] (lower value)
76- 83 F8.6 0.1nm E_[Fe/H] ? Error in [Fe/H] (upper value)
85 I1 --- MmbOB11 ? Probability membership in Battaglia et al.,
2011, J/MNRAS/411/1013
87- 94 F8.6 --- MmbNB11 ? Probability membership using
HVB11, EWMg, [Fe/H]
96-101 F6.1 km/s HVW09 ? Heliocentric radial velocity in
Walker et al., 2009, J/AJ/137/3100
103-105 F3.1 km/s e_HVW09 ? Uncertainty in HVW09
107-111 F5.2 0.1nm SigMg ? The ΣMg spectral index
113-116 F4.2 0.1nm e_SigMg ? Uncertainty in SigMg
118-122 F5.3 --- MmbOW09 ? Probability membership in Walker et al.,
2009, J/AJ/137/3100
124-131 F8.6 --- MmbNW09 ? Probability membership using HVW09, SigMg
--------------------------------------------------------------------------------
Note (1): derived adopting the calibration from Starkenburg et al.
(2010A&A...513A..34S 2010A&A...513A..34S)
--------------------------------------------------------------------------------
Acknowledgements:
Luis Cicuendez, cicuendez.salazar(at)gmail.com
(End) Patricia Vannier [CDS] 19-Sep-2017