J/ApJ/860/65 MegaCam survey of outer halo satellites. I. (Munoz+, 2018)
A MegaCam survey of outer halo satellites.
I. Description of the Survey.
Munoz R.R., Cote P., Santana F.A., Geha M., Simon J.D., Oyarzun G.A.,
Stetson P.B., Djorgovski S.G.
<Astrophys. J., 860, 65-65 (2018)>
=2018ApJ...860...65M 2018ApJ...860...65M (SIMBAD/NED BibCode)
ADC_Keywords: Photometry, SDSS; Galaxies, optical
Keywords: galaxies: dwarf; galaxies: fundamental parameters
galaxies: photometry; Galaxy: halo; globular clusters: general
Local Group
Abstract:
We describe a deep, systematic imaging study of satellites in the
outer halo of the Milky Way. Our sample consists of 58 stellar
overdensities --i.e., substructures classified as either globular
clusters, classical dwarf galaxies, or ultra-faint dwarf galaxies-that
are located at Galactocentric distances of RGC≥25kpc (outer halo)
and out to ∼400kpc. This includes 44 objects for which we have
acquired deep, wide-field, g- and r-band imaging with the MegaCam
mosaic cameras on the 3.6m Canada-France-Hawaii Telescope and the 6.5m
Magellan-Clay telescope. These data are supplemented by archival
imaging, or published gr photometry, for an additional 14 objects,
most of which were discovered recently in the Dark Energy Survey
(DES). We describe the scientific motivation for our survey, including
sample selection, observing strategy, data reduction pipeline,
calibration procedures, and the depth and precision of the photometry.
The typical 5σ point-source limiting magnitudes for our MegaCam
imaging-which collectively covers an area of ∼52deg2 --are
glim∼25.6 and rlim∼25.3 AB mag. These limits are comparable to
those from the coadded DES images and are roughly a half-magnitude
deeper than will be reached in a single visit with the Large Synoptic
Survey Telescope. Our photometric catalog thus provides the deepest
and most uniform photometric database of Milky Way satellites
available for the foreseeable future. In other papers in this series,
we have used these data to explore the blue straggler populations in
these objects, their density distributions, star formation histories,
scaling relations, and possible foreground structures.
Description:
Our primary sample is composed of 44 objects for which we have
acquired deep, wide-field (0.16-4deg2) gr imaging. Observations for
northern hemisphere objects were carried out using the MegaCam
instrument on the 3.6m CFHT in 2009 and 2010-A. In the south,
observations were made using the mosaic camera --also named Megacam--
on the 6.5m Magellan II-Clay telescope in 2010 and 2011-A.
This sample has been supplemented with published photometry, or
photometry derived from archival imaging, for 14 objects discovered
between 2010 and 2015. See Section 4.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 139 44 Basic parameters for outer halo objects:
primary sample
table2.dat 133 14 Basic parameters for outer halo objects:
secondary sample
table5.dat 80 2697979 Photometry of individual objects
for the primary sample
refs.dat 100 42 References
--------------------------------------------------------------------------------
See also:
VII/202 : Globular Clusters in the Milky Way (Harris, 1997)
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
J/AJ/109/218 : Catalogue of globular cluster profiles (Trager+ 1995)
J/ApJS/161/304 : Star clusters in Milky Way and satellites (McLaughlin+, 2005)
J/A+A/466/181 : BVI photometry of Whiting 1 (Carraro+, 2007)
J/ApJ/670/346 : M giant stars in Sagittarius dwarf galaxy. V. (Chou+, 2007)
J/ApJ/684/1143 : BHB candidates in the Milky Way (Xue+, 2008)
J/MNRAS/397/1748 : Spectroscopic study of Segue 2 (Belokurov+, 2009)
J/ApJ/743/167 : Radial velocities and membership in Pal 13 (Bradford+, 2011)
J/AJ/144/4 : Dwarf galaxies in the Local Group (McConnachie+, 2012)
J/ApJ/803/63 : gr photometry of stars in Kim 2 (Kim+, 2015)
J/ApJ/808/95 : Spectroscopy of Reticulum II (Simon+, 2015)
J/AJ/154/199 : SMASH: Survey of MAgellanic Stellar History (Nidever+, 2017)
Byte-by-byte Description of file: table[12].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Seq [1/44] Running sequence number
4- 16 A13 --- Name Object name
18- 49 A32 --- OName Other name(s)
51- 58 F8.4 deg RAdeg Right ascension (J2000)
60- 67 F8.4 deg DEdeg Declination (J2000)
69- 76 F8.4 deg GLON Galactic longitude
78- 85 F8.4 deg GLAT Galactic latitude
87- 91 F5.3 mag E(B-V) [0.007/1.1] Reddening from
Schlafly & Finkbeiner (2011ApJ...737..103S 2011ApJ...737..103S)
93- 97 F5.1 kpc Rsun [19.8/417] Heliocentric distance
99-103 F5.1 kpc Rgc [19.2/422.1] Galactocentric distance
105-110 F6.1 kpc X [-256/85] X coordinate (1)
112-117 F6.1 kpc Y [-222/122] Y coordinate (1)
119-124 F6.1 kpc Z [-298/288] Z coordinate (1)
126-133 A8 --- Ref Discovery reference(s) (see refs.dat file)
135-139 A5 --- ID Internal identifier as in Table 5;
column added by CDS
--------------------------------------------------------------------------------
Note (1): Cartesian coordinates in a Galactocentric frame, Equation (1):
X = R☉cos.b.cos.l-X☉
Y = R☉cos.b.sin.l
Z = R☉sin.b
where X☉=8.5kpc is our adopted distance to the Galactic center,
and R☉ is the heliocentric distance to each object, so
RGC=(X2+Y2+Z2)0.5 is the distance to the Galactic center.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- ID Stellar overdensity internal identifier
6 A1 --- m_ID Component on ID ("s" or "n") (1)
7- 12 I6 --- Seq [1/454940] Star identification number
within the stellar overdensity
14- 23 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
25- 34 F10.6 deg DEdeg Declination in decimal degrees (J2000)
36- 42 F7.4 mag gmag [13.4/30.3] Calibrated g-band AB magnitude (2)
44- 49 F6.4 mag e_gmag [0.0004/9] Uncertainty in gmag
51- 57 F7.4 mag rmag [12.4/28.6] Calibrated r-band AB magnitude (2)
59- 64 F6.4 mag e_rmag [0.0004/10] Uncertainty in rmag
66- 72 F7.4 --- chi DAOPHOT chi parameter
74- 80 F7.4 --- sharp DAOPHOT sharp parameter
--------------------------------------------------------------------------------
Note (1): Objects observed both at CFHT and CLAY include an "n" for north
or "s" for south.
Note (2): Uncorrected for extinction.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: refs.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Ref Reference code
4- 22 A19 --- BibCode Bibcode of the reference
24- 51 A28 --- Auth Author's name(s)
53-100 A48 --- Comm Comment
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
Munoz et al. Paper I. 2018ApJ...860...65M 2018ApJ...860...65M This Catalog
Santana et al. Paper II. 2013ApJ...774..106S 2013ApJ...774..106S
Munoz et al. Paper III. 2018ApJ...860...66M 2018ApJ...860...66M
Carballo-Bello et al. Paper IV. 2015ApJ...805...51C 2015ApJ...805...51C
Santana et al. Paper VI. 2016ApJ...829...86S 2016ApJ...829...86S
Marchi-Lasch et al. Paper VII. 2019ApJ...874...29M 2019ApJ...874...29M
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 02-Jul-2019