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J/ApJS/209/29 MYStIX: MIR observations and catalogs (Kuhn+, 2013)
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Beginning of ReadMe :J/ApJS/209/29 MYStIX: Mid-IR observations and catalogs (Kuhn+, 2013)
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The Massive Young star-forming complex Study in Infrared and X-ray:
mid-infrared observations and catalogs.
Kuhn M.A., Povich M.S., Luhman K.L., Getman K.V., Busk H.A., Feigelson E.D.
<Astrophys. J. Suppl. Ser., 209, 29 (2013)>
=2013ApJS..209...29K
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ADC_Keywords: Photometry, infrared ; H II regions ; Clusters, open
Keywords: infrared: stars, methods: data analysis, planetary systems
protoplanetary disks, stars: pre-main sequence
Abstract:
Spitzer IRAC observations and stellar photometric catalogs are
presented for the Massive Young star-forming complex Study in the
Infrared and X-ray (MYStIX). MYStIX is a multiwavelength census of
young stellar members of 20 nearby (d<4kpc), Galactic, star-forming
regions that contain at least one O star. All regions have data
available from the Spitzer Space Telescope consisting of GLIMPSE or
other published catalogs for 11 regions and results of our own
photometric analysis of archival data for the remaining 9 regions.
This paper seeks to construct deep and reliable catalogs of sources
from the Spitzer images. Mid-infrared study of these regions faces
challenges of crowding and high nebulosity. Our new catalogs typically
contain fainter sources than existing Spitzer studies, which improves
the match rate to Chandra X-ray sources that are likely to be young
stars, but increases the possibility of spurious point-source
detections, especially peaks in the nebulosity. IRAC color-color
diagrams help distinguish spurious detections of nebular polycyclic
aromatic hydrocarbon emission from the infrared excess associated with
dusty disks around young stars. The distributions of sources on the
mid-infrared color-magnitude and color-color diagrams reflect
differences between MYStIX regions, including astrophysical effects
such as stellar ages and disk evolution.
Description:
The GLIMPSE survey is a Legacy Science Program of NASA's Spitzer Space
Telescope to study star formation in the disk of the Milky Way Galaxy.
It contains six MYStIX regions - the Lagoon Nebula, the Trifid Nebula,
NGC 6334, the Eagle Nebula, M 17, and NGC 6357 - within the 2deg
wide strip along the Galactic equator (GLIMPSE I and II data
releases). Furthermore, Spitzer images and photometry for RCW 38 and
NGC 3576 come from the Vela-Carina survey (Majewski et al.
2007sptz.prop40791M), using a similar observing strategy with
mosaicking and photometric analysis performed with the GLIMPSE
pipeline.
We obtained publicly available raw IRAC images from the Spitzer
Heritage Archive for nine MYStIX regions without GLIMPSE coverage.
The target list and details of the Astronomical Observation Requests
(AORs) are provided in Table 1. The camera spatial resolutions are
FWHM=1.6" to 1.9" from 3.6 to 8.0um.