| Name | OT2_jkauff01_3 |
| Title | Maddalena.s Cloud: A unique Laboratory for Early Evolutionary Stages of massive GMCs? |
| URL | http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342250790&instrument_name=SPIRE/PACS parallel&product_level=LEVEL0&compress=true |
| DOI | https://doi.org/10.5270/esa-vdtvtic |
| Author | kauffmann, j. |
| Description | We propose to establish the evolutionary state of Maddalena.s Cloud. This region is regularly discussed as a prototype for a giant molecular cloud (GMC) in an early phase of its life. This suggestion is based on the fact that this region of about 3x10^5 M_sun is entirely devoid of embedded massive stars. Thus, this region potentially presents an ideal site to study the initial conditions for the evolution towards clouds like Orion A. This is not entirely clear, though: it has also been argued that this cloud might be at the end of its life, and is now dispersing after being stirred up by previous star formation. We therefore propose to execute two complementary experiments to establish the cloud.s evolutionary status. Both will use wide-field parallel mode SPIRE-PACS dust emission maps. First, we will obtain the first reliable estimates for the mass of the cloud and its clumps to revise the --- presently very uncertain --- virial analysis on which suggestions for cloud dispersal are based. Second, we will search for deeply embedded young stellar objects (YSOs): if these very young (class 0-I) YSOs exist throughout the cloud, it would be hard to argue that this is a cloud in which star formation is ending. Depending on these experiments, our data will then be used to constrain the physical conditions in the early life of massive GMCs. Certainly, the properties of this cloud are unique: we only expect to find about 6 such massive clouds without O stars within 2.2kpc from sun. This is the only cloud of this sort we presently know, and so our observations will have a significant legacy value for studies of star formation. |
| Publication | Rethinking a Mysterious Molecular Cloud . Imara N. et al. . The Astrophysical Journal, Volume 803, Issue 1, article id. 38, 14 pp. (2015). . 803 . 10.1088/0004-637X/803/1/38 . 2015ApJ...803...38I , Galactocentric variation of the gas-to-dust ratio and its relation with metallicity . Giannetti A. et al. . Astronomy & Astrophysics, Volume 606, id.L12, 14 pp. . 606 . 10.1051/0004-6361/201731728 . 2017A&A...606L..12G , Infrared Excess of a Large OB Star Sample . Deng Dingshan et al. . The Astrophysical Journal . null . null . 2022ApJ...935..175D , Understanding star formation in molecular clouds. I. Effects of line-of-sight contamination on the column density structure . Schneider N. et al. . Astronomy & Astrophysics, Volume 575, id.A79, 17 pp. . 575 . 10.1051/0004-6361/201423569 . 2015A&A...575A..79S , New Debris Disks in Nearby Young Moving Groups . Moór A. et al. . The Astrophysical Journal, Volume 826, Issue 2, article id. 123, 16 pp. (2016). . 826 . 10.3847/0004-637X/826/2/123 . 2016ApJ...826..123M , |
| Instrument | SPIRE/PACS parallel_SpirePacsParallel_ |
| Temporal Coverage | 2012-09-09T17:20:11Z/2012-10-15T12:05:43Z |
| Version | SPG v14.2.0 |
| Mission Description | 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. |
| Creator Contact | https://support.cosmos.esa.int/h®erschel/ |
| Date Published | 2013-04-15T09:15:54Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 2013-04-15T09:15:54Z, OT2_jkauff01_3, SPG v14.2.0. https://doi.org/10.5270/esa-vdtvtic |