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J/AJ/122/1844       MSX and 2MASS cross-correlation in LMC      (Egan+, 2001)

MSX, 2MASS, and the Large Magellanic Cloud: a combined near- and mid-infrared view. Egan M.P., van Dyk S.D., Price S.D. <Astron. J. 122, 1844 (2001)> =2001AJ....122.1844E
ADC_Keywords: Magellanic Clouds ; Surveys ; Photometry, infrared Keywords: catalogs - galaxies: dwarf - galaxies: stellar content - infrared radiation - Local Group - Magellanic Clouds - stars: AGB and post-AGB - stars: carbon - stars: late-type - supergiants - surveys Abstract: The Large Magellanic Cloud (LMC) has been observed by the Midcourse Space Experiment (MSX) in the mid-infrared and the Two Micron All Sky Survey (2MASS) in the near-infrared. We have performed a cross-correlation of the 1806 MSX catalog sources and nearly 1.4 million 2MASS catalogued point and extended sources and find 1664 matches. Using the available color information, we identify a number of stellar populations and nebulae, including main-sequence stars, giant stars, red supergiants, carbon- and oxygen-rich asymptotic giant branch (AGB) stars, planetary nebulae, H II regions, and other dusty objects likely associated with early-type stars. A total of 731 of these sources have no previous identification. We compile a listing of all objects, which includes photometry and astrometry. The 8.3µm MSX sensitivity is the limiting factor for object detection: only the brighter red objects, specifically the red supergiants, AGB stars, planetary nebulae, and H II regions, are detected in the LMC. The remaining objects are likely in the Galactic foreground. The spatial distribution of the infrared LMC sources may contribute to understanding stellar formation and evolution and the overall galactic evolution. We demonstrate that a combined mid- and near-infrared photometric baseline provides a powerful means of identifying new objects in the LMC for future ground-based and space-based follow-up observations. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 89 1488 MSX sources in common with the 2MASS 2IDR table3.dat 89 176 MSX sources in common with the 2MASS unreleased regions table4.dat 78 142 MSX sources without 2MASS point source matches
See also: B/2mass : The 2MASS database (IPAC/UMass, 2000) V/98 : MSX Infrared Astrometric Catalog (Egan+ 1996) V/107 : MSX5C Infrared Point Source Catalog (Egan+ 1999) Table 1: SPIRIT III spectral bands -------------------------------------------------------------------------------- Band Active Isophotal 50% Peak Isophotal Abs. Photom LMC Survey columns lambda (um) intensity BW (um) accuracy (%) sens. (Jy) -------------------------------------------------------------------------------- A 8 8.28 6.8 -10.8 3.36 5 0.045 B1 2 4.29 4.22- 4.36 0.104 9 10. B2 2 4.35 4.24- 4.45 0.179 9 6. C 4 12.13 11.1 -13.2 1.72 3 0.6 D 4 14.65 13.5 -15.9 2.23 4 0.5 E 2 21.34 18.2 -25.1 6.24 6 1.1 Byte-by-byte Description of file: table2.dat table3.dat
Bytes Format Units Label Explanations
1- 4 I4 --- MSX The MSX number (G1) 6- 12 F7.4 deg RAdeg Right Ascension in decimal degrees (J2000) 14- 21 F8.4 deg DEdeg Declination in decimal degrees (J2000) 23- 27 F5.2 mag Jmag ? The J band magnitude 29- 33 F5.2 mag Hmag ? The H band magnitude 35- 39 F5.2 mag Kmag ? The Ks band magnitude 41- 45 F5.2 mag Amag The MSX A-band (8.3µm) magnitude 47- 53 A7 --- IRType The IR type 55- 67 A13 --- SType The SIMBAD type 69- 89 A21 --- SName The SIMBAD name
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 4 I4 --- MSX The MSX number (G1) 6- 12 F7.4 deg RAdeg Right Ascension in decimal degrees (J2000) 14- 21 F8.4 deg DEdeg Declination in decimal degrees (J2000) 23- 27 F5.3 mag Amag The MSX A-band (8.28µm) magnitude 29- 33 F5.3 mag Cmag ? The MSX C-band (12.13µm) magnitude 35- 39 F5.3 mag Dmag ? The MSX D-band (14.65µm) magnitude 41- 46 F6.3 mag Emag ? The MSX E-band (21.34µm) magnitude 48- 52 A5 --- SType The SIMBAD type 54- 71 A18 --- SName The SIMBAD name 73 I1 --- Note1 Number of MSX scan legs in which the source was detected (1) 75 I1 --- Note2 ? Source appearance code in MSX A-band coadded image (2) 77 I1 --- Note3 ? Source appearance code in the 2MASS images (3)
Note (1): This is a possible measure of the source's reliability. Note (2): Note on source appearance in MSX A-band coadded image: NULL = point source in MSX image; 2 = multiple/blended source at position; 3 = extended emission source at position; 4 = very low SNR source, possibly not real; and, 5 = no apparent emission. Note (3): Note on source appearance in the 2MASS images: NULL = source not seen in 2MASS images; 2 = extended 2MASS emission; 3 = very bright (saturated) 2MASS star; 4 = possible positional mismatch; and, 5 = possible faint emission at source position in 2MASS images.
Global notes: Note (G1): The MSX number is the original number of the record in the table "lmc.dat" in MSX (Cat. V/107) catalog, MSX LMC NNNN in Simbad.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 29-Jan-2002
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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