J/A+A/599/A109 Draco nebula Herschel 250um map (Miville-Deschenes+, 2017)
Structure formation in a colliding flow: The Herschel view of the Draco nebula.
Miville-Deschenes M.-A., Salome Q., Martin P.G., Joncas G., Blagrave K.,
Dassas K., Abergel A., Beelen A., Boulanger F., Lagache G., Lockman F.J.,
Marshall D.J.
<Astron. Astrophys. 599, A109 (2017)>
=2017A&A...599A.109M 2017A&A...599A.109M (SIMBAD/NED BibCode)
ADC_Keywords: Molecular clouds ; Photometry, millimetric/submm
Keywords: turbulence - methods: data analysis -
ISM: individual objects: Draco nebula - ISM: kinematics and dynamics -
ISM: structure - Galaxy: halo
Abstract:
The Draco nebula is a high Galactic latitude interstellar cloud
observed at velocities corresponding to the intermediate velocity
cloud regime. This nebula shows unusually strong CO emission and
remarkably high-contrast small-scale structures for such a diffuse
high Galactic latitude cloud. The 21cm emission of the Draco nebula
reveals that it is likely to have been formed by the collision of a
cloud entering the disk of the Milky Way. Such physical conditions are
ideal to study the formation of cold and dense gas in colliding flows
of diffuse and warm gas.
The objective of this study is to better understand the process of
structure formation in a colliding flow and to describe the ects of
matter entering the disk on the interstellar medium.
We conducted Herschel-SPIRE observations of the Draco nebula. The
clumpfind algorithm was used to identify and characterize the
small-scale structures of the cloud.
Description:
Draco was observed with Herschel PACS (110 and 170um) and SPIRE (250,
350 and 500um) as part of the open-time program "First steps toward
star formation: unveiling the atomic to molecular transition in the
diffuse interstellar medium" (P.I. M-A Miville-Deschenes). A field
of 3.85x3.85 was observed in parallel mode. Unfortunately, an error
occurred during the acquisition of the PACS data making them unusable.
Therefore, the results presented here are solely based on SPIRE data,
especially the 250um map that has the highest angular resolution.
Objects:
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RA (2000) DE Designation(s)
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16 52 +61.0 Draco nebula = NAME Draco Nebula
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 118 1 Informations on fits image
fits/* . 1 Fits image
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See also:
J/A+A/364/712 : BV photometry in Draco molecular cloud (Penprase+, 2000)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 23 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 34 I5 Kibyte size Size of FITS file
36- 64 A29 --- FileName Name of FITS file, in subdirectory fits
66-118 A53 --- Title Title of the FITS file
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Acknowledgements:
Marc-Antoine Miville-Deschenes, marc-antoine.miville-deschenes(at)ias.u-psud.fr
(End) Patricia Vannier [CDS] 07-Mar-2017