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On the origin of M81 group extended dust emission

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Abstract
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 an order of a few arcmin scales, the far-infrared (Herschel 250 mu m) emission correlates spatially very well with a particular narrow-velocity (2-3 km s(-1)) 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. Ultraviolet 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 arcmin scales and that at smaller scales there can be quite large dust-temperature variations.
Keywords
LATITUDE, STAR-FORMATION, HYDROGEN, CIRRUS, dust, extinction, galaxies: evolution, galaxies: individual: M81, INFRARED-EMISSION, NEARBY GALAXY SURVEY

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Chicago
Davies, JI, CD Wilson, R Auld, Maarten Baes, MJ Barlow, GJ Bendo, JJ Bock, et al. 2010. “On the Origin of M81 Group Extended Dust Emission.” Monthly Notices of the Royal Astronomical Society 409 (1): 102–108.
APA
Davies, JI, Wilson, C., Auld, R., Baes, M., Barlow, M., Bendo, G., Bock, J., et al. (2010). On the origin of M81 group extended dust emission. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 409(1), 102–108.
Vancouver
1.
Davies J, Wilson C, Auld R, Baes M, Barlow M, Bendo G, et al. On the origin of M81 group extended dust emission. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 2010;409(1):102–8.
MLA
Davies, JI, CD Wilson, R Auld, et al. “On the Origin of M81 Group Extended Dust Emission.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 409.1 (2010): 102–108. Print.
@article{1236005,
  abstract     = {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 an order of a few arcmin scales, the far-infrared (Herschel 250 mu m) emission correlates spatially very well with a particular narrow-velocity (2-3 km s(-1)) 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. Ultraviolet 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 arcmin scales and that at smaller scales there can be quite large dust-temperature variations.},
  author       = {Davies, JI and Wilson, CD and Auld, R and Baes, Maarten and Barlow, MJ and Bendo, GJ and Bock, JJ and Boselli, A and Bradford, M and Buat, V and Castro-Rodriguez, N and Chanial, P and Charlot, S and Ciesla, L and Clements, DL and Cooray, A and Cormier, D and Cortese, L and Dwek, E and Eales, SA and Elbaz, D and Galametz, M and Galliano, F and Gear, WK and Glenn, J and Gomez, HL and Griffin, M and Hony, S and Isaak, KG and Levenson, LR and Lu, N and Madden, S and O'Halloran, B and Okumura, K and Oliver, S and Page, MJ and Panuzzo, P and Papageorgiou, A and Parkin, TJ and Perez-Fournon, I and Pohlen, M and Rangwala, N and Rigby, EE and Roussel, H and Rykala, A and Sacchi, N and Sauvage, M and Schulz, B and Schirm, MRP and Smith, MWL and Spinoglio, L and Stevens, JA and Srinivasan, S and Symeonidis, M and Trichas, M and Vaccari, M and Vigroux, L and Wozniak, H and Wright, GS and Zeilinger, WW},
  issn         = {0035-8711},
  journal      = {MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY},
  keyword      = {LATITUDE,STAR-FORMATION,HYDROGEN,CIRRUS,dust,extinction,galaxies: evolution,galaxies: individual: M81,INFRARED-EMISSION,NEARBY GALAXY SURVEY},
  language     = {eng},
  number       = {1},
  pages        = {102--108},
  title        = {On the origin of M81 group extended dust emission},
  url          = {http://dx.doi.org/10.1111/j.1365-2966.2010.17774.x},
  volume       = {409},
  year         = {2010},
}

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