Herschel-SPIRE observations of the Polaris flare : structure of the diffuse interstellar medium at the sub-parsec scale

M. -A. Miville-Deschênes 1 P. G. Martin 2 A. Abergel 3 J. -P. Bernard F. Boulanger 3 G. Lagache 3 L. D. Anderson 4 P. André 5 H. Arab J. -P. Baluteau 4 K. Blagrave S. Bontemps 6, 7, 8, 9 M. Cohen M. Compiegne P. Cox E. Dartois 3 G. Davis 10 R. Emery T. Fulton C. Gry 4 E. Habart 3 M. Huang 11 C. Joblin 12 S. C. Jones J. Kirk 13 T. Lim 14 S. Madden 15 G. Makiwa A. Menshchikov S. Molinari 16 H. Moseley F. Motte 17, 18 D. A. Naylor K. Okumura D. Pinheiro Gocalvez E. Polehampton J. A. Rodón D. Russei P. Saraceno 16 N. Schneider 17 S. Sidher L. Spencer B. Swinyard D. Ward-Thompson 19 G. J. White 20 A. Zavagno 4, 21
Abstract : We present a power spectrum analysis of the Herschel-SPIRE observations of the Polaris flare, a high Galactic latitude cirrus cloud midway between the diffuse and molecular phases. The SPIRE images of the Polaris flare reveal for the first time the structure of the diffuse interstellar medium down to 0.01 parsec over a 10 square degrees region. These exceptional observations highlight the highly filamentary and clumpy structure of the interstellar medium even in diffuse regions of the map. The power spectrum analysis shows that the structure of the interstellar medium is well described by a single power law with an exponent of -2.7 +- 0.1 at all scales from 30" to 8 degrees. That the power spectrum slope of the dust emission is constant down to the SPIRE angular resolution is an indication that the inertial range of turbulence extends down to the 0.01 pc scale. The power spectrum analysis also allows the identification of a Poissonian component at sub-arcminute scales in agreement with predictions of the cosmic infrared background level at SPIRE wavelengths. Finally, the comparison of the SPIRE and IRAS 100 micron data of the Polaris flare clearly assesses the capability of SPIRE in maping diffuse emission over large areas.
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https://hal.archives-ouvertes.fr/hal-00523050
Contributeur : Marie-Paule Pomies <>
Soumis le : lundi 4 octobre 2010 - 12:18:28
Dernière modification le : vendredi 28 avril 2017 - 01:01:39

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M. -A. Miville-Deschênes, P. G. Martin, A. Abergel, J. -P. Bernard, F. Boulanger, et al.. Herschel-SPIRE observations of the Polaris flare : structure of the diffuse interstellar medium at the sub-parsec scale. Astronomy and Astrophysics - A&A, EDP Sciences, 2010, 518, pp.L104. <10.1051/0004-6361/201014678>. <hal-00523050>

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