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 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:
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RA (2000) DE Designation(s)
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00 42 44.3 +41 16 09 M31 = NGC 224
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
maps.dat 74 4 FITS maps list
maps/* . 4 FITS maps
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Byte-by-byte Description of file: maps.dat
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Bytes Format Units Label Explanations
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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
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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