J/AJ/145/163 Catalog of stars in Sgr dwarf galaxy (Newby+, 2013)
A spatial characterization of the Sagittarius dwarf galaxy tidal tails.
Newby M., Cole N., Newberg H.J., Desell T., Magdon-Ismail M., Szymanski B.,
Varela C., Willett B., Yanny B.
<Astron. J., 145, 163 (2013)>
=2013AJ....145..163N 2013AJ....145..163N
ADC_Keywords: Photometry, SDSS ; Galactic pole, north ; Galactic pole, south
Keywords: catalogs - Galaxy: halo - Galaxy: structure - methods: data analysis -
methods: statistical
Abstract:
We measure the spatial density of F turnoff stars in the Sagittarius
dwarf tidal stream, from Sloan Digital Sky Survey data, using
statistical photometric parallax. We find a set of continuous,
consistent parameters that describe the leading Sgr stream's position,
direction, and width for 15 stripes in the north Galactic cap, and
three stripes in the south Galactic cap. We produce a catalog of stars
that has the density characteristics of the dominant leading Sgr tidal
stream that can be compared with simulations. We find that the width
of the leading (north) tidal tail is consistent with recent triaxial
and axisymmetric halo model simulations. The density along the stream
is roughly consistent with common disruption models in the north, but
possibly not in the south. We explore the possibility that one or more
of the dominant Sgr streams has been misidentified, and that one or
more of the "bifurcated" pieces is the real Sgr tidal tail, but we do
not reach definite conclusions. If two dwarf progenitors are assumed,
fits to the planes of the dominant and "bifurcated" tidal tails favor
an association of the Sgr dwarf spheroidal galaxy with the dominant
southern stream and the "bifurcated" stream in the north. In the north
Galactic cap, the best fit Hernquist density profile for the smooth
component of the stellar halo is oblate, with a flattening parameter
q=0.53, and a scale length of r0=6.73. The southern data for both
the tidal debris and the smooth component of the stellar halo do not
match the model fits to the north, although the stellar halo is still
overwhelmingly oblate. Finally, we verify that we can reproduce the
parameter fits on the asynchronous MilkyWay@home volunteer computing
platform.
Description:
Table5 include a sample set of stars that has the density
characteristics of the Sgr dwarf tidal stream. This table was
generated by asking, for each star in the input dataset, what the
probability is that it is in the Sgr stream, and selecting it with
that probability. Our data was queried from the Sloan Digital Sky
Survey (SDSS) photometric catalog, with data for the south Galactic
cap taken from the DR6 catalog (Adelman-McCarthy et al., 2007, cat.
II/282), and data for the north Galactic cap taken from the DR7
catalog (Abazajian et al., 2009, cat. II/294).
Objects:
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RA (ICRS) DE Designation(s)
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18 55 03.1 -30 28 42 SAGITTARIUS DWARF GALAXY = Sgr dSph
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 24 200396 Sagittarius star catalog
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See also:
V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
II/282 : The SDSS Photometric Catalog, Release 6 (Adelman-McCarthy+, 2007)
J/MNRAS/427/2647 : Sgr dSph stars spectral classification (McDonald+, 2012)
J/ApJ/756/74 : 2MASS view of Sgr dSph. VII. Kinematics (Frinchaboy+, 2012)
J/A+A/513/A62 : Sgr dSph VIMOS photometry and RVs (Giuffrida+, 2010)
J/A+A/465/815 : Abundances of Sgr dSph stars (Sbordone+, 2007)
J/A+A/464/201 : RGB stars in Sagittarius streams (Monaco+, 2007)
J/ApJ/670/346 : M giant stars in Sagittarius dwarf galaxy. V. (Chou+, 2007)
J/A+A/459/777 : X-ray sources in Sagittarius & Carina dSph (Cignoni+, 2006)
J/A+A/375/909 : RR Lyrae stars in the Sgr dwarf (Cseresnjes 2001)
J/A+A/357/871 : RR Lyrae stars in the Sgr dwarf galaxy (Cseresnjes+, 2000)
J/AJ/119/1760 : M54 and Sgr dSph VI photometry (Layden+, 2000)
J/AJ/119/777 : BVRI photometry of Sagittarius dwarf galaxy (Lee+, 2000)
J/A+A/330/453 : Sagittarius Dwarf Galaxy VI photometry (Marconi+, 1998)
J/AJ/113/634 : The survival of Sagittarius dwarf galaxy (Ibata+ 1997)
J/AJ/109/1086 : VI Photometry in M54 and Sgr Dwarf Galaxy (Sarajedini+ 1995)
J/AJ/110/1141 : Variables in the Sagittarius dSph (Mateo+ 1995)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg GLON Standard Galactic longitude (1)
11- 19 F9.5 deg GLAT Standard Galactic latitude (1)
21- 24 F4.1 mag gmag Dereddened SDSS g band magnitude (1)
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Note (1): This table contains star positions consistent with the density profile
of the Sagittarius Dwarf galaxy tidal stream as detected in the Sloan
Digital Sky Survey (SDSS) using stripes 9-23 from Data Release 7 (DR7;
Abazajian et al., 2009, cat. II/294)), and stripes 79, 82, and 86 from
DR6 (Adelman-McCarthy et al., 2007, cat. II/282).
IMPORTANT NOTE: These are NOT stars that are confirmed members of the
Sagittarius dwarf tidal stream, but rather, these are actual stars in SDSS
that are, as a whole, consistent with the density profile. Number of stars
in the North Galactic Cap (b>0): 158163. Number of stars in the South
Galactic Cap (b<0): 42233.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 02-Jun-2014