|The Conditions of Isolated Dark Clouds with Signs of On Going H2 Formation
|We propose to map three nearby isolated dark clouds, CB 45, B227, and L1574 with SPIRE. They are carefully selected based on their intriguing morphology of displacement between CO, 2MASS extinction, atomic gas traced HI Narrow self-absorption (HINSA),which is a unique tracer of cold atomic gas INSIDE molecular clouds. SPIRE maps will provide crucial dust emission information for quantifying dust column density, dust temperature and dust properties. SPIRE will provide much higher resolution than 2MASS extinction and is capable of tracing relatively diffuse dust structure missed by 2MASS. Combining HINSA, molecular gas, extinction, and dust emission data, we will have an unprecedented comprehensive data set for understanding the transition from atomic to molecular ISM. The spacial information and high sensitivity provided by SPIRE will enable us to construct time dependent H2 formation model for realistic clouds. Such a model will provide quantitive answers, for the first time, to fundamental questions in star formation, such as How molecular are molecular clouds? and What is the age of a dark cloud?.
|A study of the starless dark cloud LDN 1570: Distance, dust properties, and magnetic field geometry . Eswaraiah C. et al. . Astronomy & Astrophysics, Volume 556, id.A65, 17 pp. . 556 . 10.1051/0004-6361/201220603 . 2013A&A...556A..65E ,
|Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
|Publisher And Registrant
|European Space Agency
|European Space Agency, 2012, OT1_dli_2, SPG v14.1.0. https://doi.org/10.5270/esa-dfpc9ff