Tibbs, C. T. and Flagey, N. and Paladini, R. and Compiègne, M. and Shenoy, S. and Carey, S. and Noriega-Crespo, A. and Dickinson, C. and Ali-Haïmoud, Y. and Casassus, S. and Cleary, K. and Davies, R. D. and Davis, R. J. and Hirata, C. M. and Watson, R. A. (2011) Spitzer characterization of dust in an anomalous emission region: the Perseus cloud. Monthly Notices of the Royal Astronomical Society, 418 (3). pp. 1889-1900. ISSN 0035-8711 http://resolver.caltech.edu/CaltechAUTHORS:20120217-113352431
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Anomalous microwave emission is known to exist in the Perseus cloud. One of the most promising candidates to explain this excess of emission is electric dipole radiation from rapidly rotating very small dust grains, commonly referred to as spinning dust. Photometric data obtained with the Spitzer Space Telescope have been reprocessed and used in conjunction with the dust emission model dustem to characterize the properties of the dust within the cloud. This analysis has allowed us to constrain spatial variations in the strength of the interstellar radiation field (χ_(ISRF)), the mass abundances of the polycyclic aromatic hydrocarbons (PAHs) and the very small grains (VSGs) relative to the big grains (Y_(PAH) and Y_(VSG)), the column density of hydrogen (N_H) and the equilibrium dust temperature (T_(dust)). The parameter maps of Y_(PAH), Y_(VSG) and χ_(ISRF) are the first of their kind to be produced for the Perseus cloud, and we used these maps to investigate the physical conditions in which anomalous emission is observed. We find that in regions of anomalous emission the strength of the ISRF, and consequently the equilibrium temperature of the dust, is enhanced while there is no significant variation in the abundances of the PAHs and the VSGs or the column density of hydrogen. We interpret these results as an indication that the enhancement in χ_(ISRF) might be affecting the properties of the small stochastically heated dust grains resulting in an increase in the spinning dust emission observed at 33 GHz. This is the first time that such an investigation has been performed, and we believe that this type of analysis creates a new perspective in the field of anomalous emission studies, and represents a powerful new tool for constraining spinning dust models.
|Additional Information:||© 2011 The Authors. Monthly Notices of the Royal Astronomical Society © 2011 RAS. Accepted 2011 August 9. Received 2011 July 21; in original form 2011 June 8. Article first published online: 29 Sep 2011. We thank the anonymous referee for their careful reading of this paper and for providing useful comments. This work is based in part on archival data obtained with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. Support for this work was provided by an award issued by JPL/Caltech. This work has been done within the framework of a NASA/ADP ROSES-2009 grant, no. 09-ADP09-0059. CD acknowledges support from an STFC Advanced Fellowship and an ERC IRG grant under the FP7. SC acknowledges support from FONDECYT grant 1100221, and from the Chilean Center for Astrophysics FONDAP 15010003.|
|Subject Keywords:||radiation mechanisms: general; ISM: abundances; dust, extinction; ISM: individual objects: Perseus cloud, IC 348; infrared: ISM|
|Official Citation:||Tibbs, C. T., Flagey, N., Paladini, R., Compiègne, M., Shenoy, S., Carey, S., Noriega-Crespo, A., Dickinson, C., Ali-Haïmoud, Y., Casassus, S., Cleary, K., Davies, R. D., Davis, R. J., Hirata, C. M. and Watson, R. A. (2011), Spitzer characterization of dust in an anomalous emission region: the Perseus cloud. Monthly Notices of the Royal Astronomical Society, 418: 1889–1900. doi: 10.1111/j.1365-2966.2011.19605.x|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||17 Feb 2012 19:49|
|Last Modified:||17 Sep 2012 19:20|
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