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J/ApJ/639/227 MSX IRDC candidate catalog (Simon+, 2006)
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catalog.dat
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Beginning of ReadMe :J/ApJ/639/227 MSX IRDC candidate catalog (Simon+, 2006)
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A catalog of Midcourse Space Experiment infrared dark cloud candidates.
Simon R., Jackson J.M., Rathborne J.M., Chambers E.T.
<Astrophys. J., 639, 227-236 (2006)>
=2006ApJ...639..227S
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ADC_Keywords: Molecular clouds ; Interstellar medium ; Infrared sources
Keywords: catalogs - dust, extinction - Galaxy: general - infrared: ISM -
ISM: clouds - ISM: structure
Abstract:
We use 8.3mum mid-infrared images acquired with the Midcourse Space
Experiment satellite to identify and catalog infrared dark clouds
(IRDCs) in the first and fourth quadrants of the Galactic plane.
Because IRDCs are seen as dark extinction features against the diffuse
Galactic infrared background, we identify them by first determining a
model background from the 8.3mum images and then searching for
regions of high decremental contrast with respect to this background.
IRDC candidates in our catalog are defined by contiguous regions
bounded by closed contours of a 2sigma decremental contrast
threshold. We identify 10,931 candidate IRDCs. For each IRDC, we also
catalog cores. These cores, defined as localized regions with at least
40% higher extinction than the cloud's average extinction, are found
by iteratively fitting two-dimensional elliptical Gaussian functions
to the contrast peaks. We identify 12,774 cores. The catalog contains
the position, angular size, orientation, area, peak contrast, peak
contrast signal-to-noise, and integrated contrast of the candidate
IRDCs and their cores.