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J/MNRAS/436/413 VISTA Sgr dSph ZJKs photometry (McDonald+, 2013)
The following files can be converted to FITS (extension .fit or fit.gz)
table1.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/MNRAS/436/413
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Beginning of ReadMe :J/MNRAS/436/413 VISTA ZJKs photometry of Sgr dSph (McDonald+, 2013)
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VISTA's view of the Sagittarius dwarf spheroidal galaxy and southern
Galactic bulge.
McDonald I., Zijlstra A.A., Sloan G.C., Kerins E.J., Lagadec E.,
Minniti D., Santucho M.V., Gurovich S., Dominguez Romero M.J.L.
<Mon. Not. R. Astron. Soc., 436, 413-429 (2013)>
=2013MNRAS.436..413M
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ADC_Keywords: Galaxies, nearby ; Milky Way ; Photometry, infrared
Keywords: stars: AGB and post-AGB - stars: evolution -
stars: fundamental parameters - stars: late type - Galaxy: bulge -
galaxies: individual: Sgr dSph
Abstract:
We present the deepest near-infrared (ZJKs) photometry yet
obtained of the Sagittarius dwarf spheroidal (Sgr dSph), using Visible
and Infrared Survey Telescope for Astronomy (VISTA) to survey 11
square degrees centred on its core. We list locations and ZJKs-band
magnitudes for over 2.9 million sources in the field. We discuss the
isolation of the Sgr dSph from the foreground and Galactic Bulge
populations, identify the Sgr dSph's horizontal branch in the
near-infrared for the first time and map the density of the galaxy's
stars. We present isochrones for the Sgr dSph and Bulge populations.
These are consistent with the previously reported properties of the
Sgr dSph core: namely that it is dominated by a population between
[Fe/H] -1dex and solar, with a significant [alpha/Fe] versus [Fe/H]
gradient. While strong contamination from the Galactic Bulge prevents
accurate measurement of the (Galactic) north side of the Sgr dSph, the
dwarf galaxy can be well approximated by a roughly ovaloid projection
of characteristic size 4degx2deg, beyond which the projected
stellar density is less than half that of the region surrounding the
core. The galaxy's major axis is perpendicular to the Galactic Plane,
as in previous studies. We find slight evidence to confirm a
metallicity gradient in the Sgr dSph and use isochrones to fit a
distance of 24.3+/-2.3kpc. We were unable to fully constrain the
metallicity distribution of the Sgr dSph due to the Bulge
contamination and strong correlation of [alpha/Fe] with metallicity;
however, we find that metal-poor stars ([Fe/H]< -1) make up < 29% of
the Sgr dSph's upper red giant branch population. The Bulge population
is best fitted by a younger population with [Fe/H] approx 0 and
[alpha/Fe] approx 0 or slightly higher. We find no evidence for a
split, peanut- or X-shaped Bulge population in this line of sight
(l=5.6+/- 1deg, b=-14.1+/- 3deg).
Description:
The VISTA Infrared Camera (VIRCAM) surveyed the core of the Sgr dSph
over 16 nights between 2012 April 06 and 2012 June 07. VIRCAM consists
of 16 imaging chips which create a pawprint that must be moved around
the sky to create a contiguous imaging tile of around 1.5 square
degrees.
The simultaneous ZJKs-band images allowed for a relatively simple
merging procedure. Objects identified in different filters were simply
grouped by finding the nearest J- and Ks-band neighbour to each Z-band
detection.