J/A+A/585/A78 All-sky near-infrared extinction map (Juvela+, 2016)
Near-infrared extinction with discretised stellar colours.
Juvela M., Montillaud J.
<Astron. Astrophys. 585, A78 (2016)>
=2016A&A...585A..78J 2016A&A...585A..78J (SIMBAD/NED BibCode)
ADC_Keywords: Interstellar medium ; Extinction
Keywords: ISM: clouds - dust, extinction - infrared: ISM -
methods: data analysis
Abstract:
Near-infrared (NIR) extinction remains one of the most reliable
methods of measuring the column density of dense interstellar clouds.
Extinction can be estimated using the reddening of the light of
background stars. Several methods exist (e.g., NICE, NICER, NICEST,
GNICER) to combine observations of several NIR bands into extinction
maps.
We present a new method of estimating extinction based on NIR
multiband observations and examine its performance.
Our basic method uses a discretised version of the distribution of
intrinsic stellar colours directly. The extinction of individual stars
and the average over a resolution element are estimated with Markov
chain Monte Carlo (MCMC) methods. Several variations of the basic
method are tested, and the results are compared to NICER calculations.
Description:
An all-sky extinction map in units of J-band extinction (magnitudes).
The map is given as a Healpix FITS file (NSIDE=4096, NESTED scheme) in
Galactic projection. The map has been created with the NICER method,
additionally using the information of local extinction gradients. The
resolution is FWHM=3.0-arcmin.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 65 1 Informations of fits file
fits/* . 1 Individual fits file
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- N Number of extinction map
8- 13 I6 Kibyte size Size of the fits file
15- 42 A28 --- FileName Name of the fits file in subdirectory fits
44- 65 A22 --- Title Title of the file
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Acknowledgements:
Mika Juvela, mika.juvela(at)helsinki.fi
(End) Patricia Vannier [CDS] 30-Oct-2015