J/A+A/587/A106 Perseus dust optical depth and column density maps (Zari+, 2016)
Herschel-Planck dust optical depth and column density maps. II. Perseus.
Zari E., Lombardi M., Alves J., Lada C., Bouy H.
<Astron. Astrophys. 587, A106 (2016)>
=2016A&A...587A.106Z 2016A&A...587A.106Z (SIMBAD/NED BibCode)
ADC_Keywords: Interstellar medium ; Molecular clouds ; YSOs ;
Photometry, infrared
Keywords: ISM: clouds - dust, extinction -
ISM: individual objects: Perseus molecular cloud -
methods: data analysis - ISM: structure
Abstract:
We present optical depth and temperature maps of the Perseus molecular
cloud, obtained combining dust emission data from the Herschel and
Planck satellites and 2MASS/NIR dust extinction maps. The maps have a
resolution of 36∼arcsec in the Herschel regions, and of 5∼arcmin
elsewhere. The dynamic range of the optical depth map ranges from
1x10-2mag up to 20mag in the equivalent K band extinction. We also
evaluate the ratio between the SI2.2µ extinction coefficient and
the SI850µ opacity. The value we obtain is close to the one found
in the Orion B molecular cloud. We show that the cumulative and the
differential area function of the data (which is proportional to the
probability distribution function of the cloud column density) follow
power laws with index respectively ~=-2, and ~=-3. We use WISE data to
improve current YSO catalogs based mostly on Spitzer data and we build
an up-to-date selection of Class I/0 objects. Using this selection, we
evaluate the local Schmidt law,
ΣYSO∝Σgas_β, showing that
β=2.4±0.6. Finally, we show that the area-extinction relation
is important for determining the star formation rate in the cloud,
which is in agreement with other recent works.
Description:
We present optical depth and temperature maps of the Perseus Molecular
Cloud, created combining Planck and Herschel data.
The maps were obtained using Herschel SPIRE 250um, SPIRE 350um, SPIRE
500um, and, where available, PACS 160um data. The file
planckherschelfit.fits reports the results of a full SED fit (with
free parameters the optical depth and the temperature), at the SPIRE
500um resolution (36-arcsec). The file planckherschelfit2-a.fits
uses the temperature from planckherschelfit.fits and the flux at
SPIRE 250um to infer the optical depth with a resolution of 18 arcsec.
Finally, the catalogue of Class I/0 protostars reports WISE magnitudes
for the sources used to estimate the Schmidt law.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablec1.dat 72 138 Catalog of the protostars used to determine
the Schmidt law
list.dat 197 2 List of fits files
fits/* . 2 Individual fits files
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See also:
J/ApJ/674/336 : Spitzer observations of NGC 1333 (Gutermuth+, 2008)
J/ApJS/181/321 : Properties of Spitzer c2d dark clouds (Evans+, 2009)
J/ApJS/184/18 : Spitzer survey of young stellar clusters (Gutermuth+, 2009)
J/AJ/150/40 : The Spitzer c2d survey of clouds. XII. Perseus (Young+, 2015)
J/A+A/566/A45 : Orion optical-depth and column-density maps (Lombardi+, 2014)
Byte-by-byte Description of file: tablec1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.7 deg RAdeg Right ascension (J2000)
12- 21 F10.7 deg DEdeg Declination (J2000)
23- 27 F5.2 mag W1 ? WISE magnitude at 3.4um
29- 32 F4.2 mag e_W1 ? Error on WISE magnitude at 3.4um
34- 38 F5.2 mag W2 ? WISE magnitude at 4.6um
40- 43 F4.2 mag e_W2 ? Error on WISE magnitude at 4.6um
45- 49 F5.2 mag W3 ? WISE magnitude at 12um
51- 54 F4.2 mag e_W3 ? Error on WISE magnitude at 12um
56- 60 F5.2 mag W4 ? WISE magnitude at 22um
62- 66 F5.3 mag e_W4 ? Error on WISE magnitude at 22um
68- 72 A5 -- Ref References to Spitzer catalogs (1)
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Note (1): References as follows:
Y15 = Young et al. (2015, Cat. J/AJ/150/40)
G09 = Gutermuth et al. (2009, Cat. J/ApJS/184/18)
GMM09 = Gutermuth et al. (2008, Cat. J/ApJ/674/336)
E09 = Evans et al. (2009, Cat. J/ApJS/181/321)
S14 = Sadavoy et al. (2014ApJ...787L..18S 2014ApJ...787L..18S)
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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 A1 --- --- [G]
2- 10 F9.5 deg GLON Galactic longitude
11- 19 F9.5 deg GLAT Galactic latitude
21- 24 I4 --- Nx Number of pixels along X-axis
26- 29 I4 --- Ny Number of pixels along Y-axis
31 I1 --- Nz Number of slices
33- 38 I6 Kibyte size Size of fits file
40- 66 A27 --- FileName Name of the fits file in subdirectory fits
68-197 A130 --- Title Title of the file
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Acknowledgements:
Eleonora Zari, zariem(at)strw.leidenuniv.nl
References:
Lombardi et al., Paper I 2014A&A...566A..45L 2014A&A...566A..45L, Cat. J/A+A/566/A45
(End) E. Zari [Leiden Univ., the Netherlands], P. Vannier [CDS] 14-Dec-2015