Issue |
A&A
Volume 518, July-August 2010
Herschel: the first science highlights
|
|
---|---|---|
Article Number | L87 | |
Number of page(s) | 4 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361/201014537 | |
Published online | 16 July 2010 |
Letter to the Editor
Dust-temperature of an isolated star-forming cloud: Herschel observations of the Bok globule CB244*
1
Max-Planck-Institut für Astronomie,
Königstuhl 17, 69117 Heidelberg, Germany e-mail: stutz@mpia.de
2
Department of Astronomy and Steward Observatory,
University of Arizona, 933 North Cherry Avenue,
Tucson, AZ 85721, USA
3
LERMA & UMR 8112 du CNRS, Observatoire de Paris,
61 Av. de l'Observatoire, 75014 Paris, France
4
Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot,
IRFU/Service d'Astrophysique, C.E. Saclay, Orme des
Merisiers, 91191 Gif-sur-Yvette, France
Received:
29
March
2010
Accepted:
15
April
2010
We present Herschel observations of the isolated,
low-mass star-forming Bok globule CB244. It contains two cold
sources, a low-mass Class 0 protostar and a starless core, which is
likely to be prestellar in nature, separated by 90
(~18 000 AU). The Herschel data sample the peak of the
Planck spectrum for these sources, and are therefore ideal for
dust-temperature and column density modeling. With these data and
a near-IR extinction map, the MIPS 70 μm mosaic, the SCUBA
850 μm map, and the IRAM 1.3 mm map, we model the
dust-temperature and column density of CB 244 and present the first
measured dust-temperature map of an entire star-forming molecular
cloud. We find that the column-averaged dust-temperature near the
protostar is ~17.7 K, while for the starless core it is
~10.6 K, and that the effect of external heating causes the
cloud dust-temperature to rise to ~17 K where the hydrogen
column density drops below 1021 cm-2. The total hydrogen
mass of CB 244 (assuming a distance of 200 pc) is 15±5
.
The mass of the protostellar core is 1.6±0.1
and the mass
of the starless core is 5±2
, indicating that ~45% of
the mass in the globule is participating in the star-formation
process.
Key words: ISM: individual objects: CB244 / infrared: ISM / dust, extinction / ISM: clouds / submillimeter: ISM / stars: formation
© ESO, 2010
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.