J/PAZh/38/108 3D interstellar extinct. map within nearest kpc (Gontcharov, 2012)
3D interstellar extinction map within the nearest kiloparsec.
Gontcharov G.A.
<Pis'ma Astron. Zh. 38, 108 (2012)>
=2012PAZh...38..108G 2012PAZh...38..108G (SIMBAD/NED BibCode)
=2012AstL...38...87G 2012AstL...38...87G
ADC_Keywords: Extinction ; Interstellar medium ; Milky Way ; Reddening
Keywords: Galactic solar neighborhood -
characteristics and properties of the Milky Way Galaxy -
interstellar medium - nebulae in the Milky Way
Abstract:
The product of the previously constructed 3D maps of stellar reddening
(Gontcharov, 2010AstL...36..584G 2010AstL...36..584G, Cat. J/PAZh/36/615) and Rv
variations (Gontcharov, 2012AstL...38...12G 2012AstL...38...12G, J/PAZh/38/15) has allowed
us to produce a 3D interstellar extinction map within the nearest
kiloparsec from the Sun with a spatial resolution of 100pc and an
accuracy of 0.2m. This map is compared with the 2D reddening map by
Schlegel et al. (1998ApJ...500..525S 1998ApJ...500..525S), the 3D extinction map at high
latitudes by Jones et al. (2011AJ....142...44J 2011AJ....142...44J), and the analytical 3D
extinction models by Arenou et al. (1992A&A...258..104A 1992A&A...258..104A) and
Gontcharov (2009AstL...35..780G 2009AstL...35..780G). In all cases, we have found good
agreement and show that there are no systematic errors in the new map
everywhere except the direction toward the Galactic center. We have
found that the map by Schlegel et al. (1998ApJ...500..525S 1998ApJ...500..525S) reaches
saturation near the Galactic equator at E(B-V)>0.8m, has a zero-point
error and systematic errors gradually increasing with reddening, and
among the analytical models those that take into account the
extinction in the Gould Belt are more accurate. Our extinction map
shows that it is determined by reddening variations at low latitudes
and Rv variations at high ones. This naturally explains the
contradictory data on the correlation or anticorrelation between
reddening and Rv available in the literature. There is a correlation
in a thin layer near the Galactic equator, because both reddening and
Rv here increase toward the Galactic center. There is an
anticorrelation outside this layer, because higher values of Rv
correspond to lower reddening at high and middle latitudes. Systematic
differences in sizes and other properties of the dust grains in
different parts of the Galaxy manifest themselves in this way. The
largest structures within the nearest kiloparsec, including the Local
Bubble, the Gould Belt, the Great Tunnel, the Scorpius, Perseus,
Orion, and other complexes, have manifested themselves in the
constructed map.
Also the data of the Rv from Gontcharov (2012AstL...38...12G 2012AstL...38...12G, Cat.
J/PAZh/38/15) and E(B-V) from Gontcharov (2010AstL...36..584G 2010AstL...36..584G, Cat.
J/PAZh/36/615) 3D maps are added. The error of the E(B-V) is 0.04mag.
The error of the Rv is about 0.2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
mapxyzav.dat 36 630109 E(B-V), Rv and Av tabulated as a function of
X, Y, Z coordinates
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See also:
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/PAZh/36/615 : Three-dimensional reddening map for stars from 2MASS
photometry: The method and the first results (Gontcharov, 2010)
J/PAZh/38/15 : Total-to-selective extinction ratio within 700pc
(Gontcharov, 2012)
J/PAZh/38/776 : Complete sample of OB stars within 350pc (Gontcharov, 2012)
Byte-by-byte Description of file: mapxyzav.dat
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Bytes Format Units Label Explanations
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1- 5 I5 pc X [-1200,1200] X rectangular galactic coordinate
7- 11 I5 pc Y [-1200,1200] Y rectangular galactic coordinate
13- 16 I4 pc Z [-600,600] Z rectangular galactic coordinate
18- 23 F6.3 mag E(B-V) [-0.007,0.845] E(B-V) reddening (1)
25- 29 F5.3 --- Rv [1.776,5.461] Rv total-to-selective extinction
ratio (2)
31- 36 F6.3 mag Av [-0.025,2.620] Av interstellar extinction (3)
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Note (1): The E(B-V) are taken from the paper 2010AstL...36..584G 2010AstL...36..584G for nearly
a space of 2400pc along X, 2400pc along Y and 1200pc along Z centered at the
Sun and presented as the values for the cubes of 20x20x20pc. It should be
interpolated between the centres of the cubes.
Note (2): The Rv are calculated in the paper 2012AstL...38...12G 2012AstL...38...12G for nearly a
sphere of radius 700pc around the Sun and presented as the values for the
cubes of 100x100x100pc. Outside the sphere the value Rv=3.1 is accepted.
It have been and should be interpolated between the centres of the cubes.
Note (3): The Av are calculated in this paper for nearly a space of 2400pc
along X, 2400pc along Y and 1200pc along Z centered at the Sun and presented
as the values for the cubes of 20x20x20pc. It should be interpolated between
the centres of the cubes.
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Acknowledgements:
George Gontcharov, georgegontcharov(at)yahoo.com
History:
* 08-Jul-2016: First on-line table
* 15-Sep-2016: Corrected table from author
(End) George Gontcharov [Pulkovo Obs.], Patricia Vannier [CDS] 15-Sep-2016