On the origin of M81 group extended dust emission
| Autor: | Bernhard Schulz, L. Spinoglio, Maud Galametz, Andreas Papageorgiou, Jason Glenn, Jonathan Ivor Davies, Marc Sauvage, N. Lu, Matthew Joseph Griffin, Eli Dwek, Robbie Richard Auld, D. Elbaz, Seb Oliver, M. J. Barlow, Herve Wozniak, Laure Ciesla, B. O'Halloran, L. R. Levenson, Ismael Perez-Fournon, Alessandro Boselli, A. Rykala, M. Bradford, M. Trichas, Christine D. Wilson, Frédéric Galliano, Walter Kieran Gear, Naseem Rangwala, George J. Bendo, Maximilien R. P. Schirm, Maarten Baes, Mat Page, A. Cooray, Jamie Stevens, Mattia Vaccari, Koryo Okumura, N. Sacchi, Sundar Srinivasan, T. J. Parkin, Diane Cormier, Suzanne C. Madden, Pasquale Panuzzo, N. Castro-Rodriguez, V. Buat, E. E. Rigby, Michael Pohlen, Kate Gudrun Isaak, M. Symeonidis, Matthew Smith, Helene Roussel, David L. Clements, Luca Cortese, L. Vigroux, James J. Bock, Stephane Charlot, Sacha Hony, Gillian S. Wright, Haley Louise Gomez, Pierre Chanial, Stephen Anthony Eales, Werner W. Zeilinger |
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| Rok vydání: | 2010 |
| Předmět: |
Physics
Infrared Astrophysics::High Energy Astrophysical Phenomena Astronomy and Astrophysics Minute of arc Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Galaxy Wavelength Space and Planetary Science Group (periodic table) Cirrus Optical emission spectroscopy Astrophysics::Galaxy Astrophysics Dust emission |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 409:102-108 |
| ISSN: | 0035-8711 |
| Popis: | Galactic cirrus emission at far-infrared wavelengths affects many extragalactic observations. Separating this emission from that associated with extragalactic objects is both important and difficult. In this paper we discuss a particular case, the M81 group, and the identification of diffuse structures prominent in the infrared, but also detected at optical wavelengths. The origin of these structures has previously been controversial, ranging from them being the result of a past interaction between M81 and M82 or due to more local Galactic emission. We show that over of order a few arcminute scales the far-infrared (Herschel 250 &\mu&m) emission correlates spatially very well with a particular narrow velocity (2-3 km/s) component of the Galactic HI. We find no evidence that any of the far-infrared emission associated with these features actually originates in the M81 group. Thus we infer that the associated diffuse optical emission must be due to galactic light back scattered off dust in our galaxy. Ultra-violet observations pick out young stellar associations around M81, but no detectable far-infrared emission. We consider in detail one of the Galactic cirrus features, finding that the far-infrared HI relation breaks down below arc minute scales and that at smaller scales there can be quite large dust temperature variations. |
| Databáze: | OpenAIRE |
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