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J/A+A/507/283    Colors and extinction across the disk of M31  (Montalto+, 2009)

Properties of M31. I. Dust. Basic properties and a discussion on age-dependent dust heating. Montalto M., Seitz S., Riffeser A., Hopp U., Lee C.-H., Schoenrich R. <Astron. Astrophys. 507, 283 (2009)> =2009A&A...507..283M
ADC_Keywords: Galaxies, photometry ; Photometry, CCD Keywords: dust - extinction Abstract: We present the results of a study of the dust properties in M31. We analyzed Spitzer Space Telescope, GALEX, and SDSS images constraining some basic properties of the dust in M31: (i) the mass of the dust; (ii) the mean intensity of the radiation field heating the dust; (iii) the abundance of Polycyclic Aromatic Hydrocarbon (PAH) particles. We also studied which stellar populations are most likely responsible for the dust heating in M31 analyzing optical and infrared colors and comparing our observations with models which account for the age-dependent dust heating. We found that in most of the regions analyzed stars at least a few Gyr old are the major dust heaters. We then derived the extinction map across the disk of M31. Description: This dataset includes the results presented in Fig.14 and Fig.17 of the paper. The images of Fig.14 represent: the Far Ultravioet minus SDSS i-band color map in AB magnitudes (fuv_i.fits), the Total Infrared to Far Ultraviolet logarithmic ratio map (Log10(TIR/FUV), tir_fuv.fits), and the Far Ultraviolet extinction map in magnitudes (afuv.fits). All these maps have resolution of 40arcsec/pix correspondent to 670pc/pix along the plane of M31 and only regions with S/N>1 that met the selection criteria presented in Sec.2 of the paper are presented. The image of Fig.17 (ebv.fits) represents the E(B-V) map we obtained with the extrapolation procedure described at the end of the paper. In this map all the regions analyzed are shown, independently of the S/N and the selection criteria. The resolution is 6arcsec/pix correspondent to 100pc/pix along the plane of M31. All images have the WCS system included. Coordinates are in the J2000 epoch. Objects: ------------------------------------------ RA (2000) DE Designation(s) ------------------------------------------ 00 42 44.3 +41 16 09 M31 = NGC 224 ------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file maps.dat 74 4 FITS maps list maps/* 0 4 FITS maps
Byte-by-byte Description of file: maps.dat
Bytes Format Units Label Explanations
1- 12 A12 --- FileName Name of the FITS file, in "maps" subdirectory 15- 23 F9.5 deg RAdeg Right Ascension of center, degrees (J2000) 24- 32 F9.5 deg DEdeg Declination of center, degrees (J2000) 34- 35 I2 arcsec/pix Scale Map resolution 37- 74 A38 --- Title Title of the file
Acknowledgements: Marco Montalto, montalto(at)usm.uni-muenchen.de History: * 09-Jul-2009: Original version, from Marco Montalto * 12-Jan-2010: added maps.dat
(End) Marco Montalto [USM/MPE, Germany], Patricia Vannier [CDS] 09-Jul-2009
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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