| Name | OT2_jvaillan_1 |
| Title | Differential Heating of Magnetically Aligned Dust Grains |
| URL | http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342250115&instrument_name=PACS&product_level=LEVEL0&compress=true |
| DOI | https://doi.org/10.5270/esa-f5p31k1 |
| Author | vaillancourt, j. |
| Description | The observations proposed here are designed to search for the effectof differential heating on asymmetric dust-grains aligned with respectto an interstellar magnetic-field and heated by a localized radiationsource. The grains are known to be asymmetric and aligned fromobservations of background starlight polarization. Modern theories ongrain alignment suggest that photons from stars embedded in theforeground cloud are a key ingredient of the physical mechanismresponsible for alignment. This theory predicts a relation between thegrain-alignment efficiency and the angle between the magnetic fieldand the direction to the aligning radiation-source. This effect hasbeen tentatively observed in a source with a very simple geometry: thealigning photons are primarily from a single localized source (i.e., asinge star) and the local magnetic-field direction is known to befairly uniform. Such a region also has consequences for thedistribution of grain heating. For example, asymmetric grains whoselargest cross-sections are normal to the incident stellar radiationwill reach warmer equilibrium temperatures compared to grains whoselargest cross-section is parallel to that direction. This should beobserved as an azimuthal dependence of the dust color-temperature. Aswe show in this proposal, such a dependence is hinted at in work usingIRAS data at 60 and 100 micron. If this effect is real then a strongersignal is expected using longer wavelength data. Here we propose tosearch for this signal using Herschel/PACS photometry at 100 and 160micron. |
| Publication | |
| Instrument | PACS_PacsPhoto_largeScan |
| Temporal Coverage | 2012-08-23T23:31:56Z/2012-08-24T01:37:07Z |
| 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 | 2013-02-24T00:35:08Z |
| Keywords | Herschel, HSC, submillimetre, far-infrared, HIFI, PACS, SPIRE |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, vaillancourt et al., 2013, 'Differential Heating of Magnetically Aligned Dust Grains', SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-f5p31k1 |