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Herschel photometric observations of the nearby low metallicity irregular galaxy NGC 6822

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Abstract
We present the first Herschel PACS and SPIRE images of the low-metallicity galaxy NGC 6822 observed from 70 to 500 mu m and clearly resolve the H II regions with PACS and SPIRE. We find that the ratio 250/500 is dependent on the 24 mu m surface brightness in NGC 6822, which would locally link the heating processes of the coldest phases of dust in the ISM to the star formation activity. We model the SEDs of some regions H II regions and less active regions across the galaxy and find that the SEDs of H II regions show warmer ranges of dust temperatures. We derive very high dust masses when graphite is used in our model to describe carbon dust. Using amorphous carbon, instead, requires less dust mass to account for submm emission due to its lower emissivity properties. This indicates that SED models including Herschel constraints may require different dust properties than commonly used. The global G/D of NGC 6822 is finally estimated to be 186, using amorphous carbon.
Keywords
galaxies: photometry, STAR-FORMATION HISTORY, galaxies: dwarf, galaxies: ISM, LOCAL GROUP, INTERSTELLAR DUST, INFRARED-EMISSION, AMORPHOUS-CARBON, GRAPHITE, SPITZE

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Chicago
Galametz, M, SC Madden, F Galliano, S Hony, M Sauvage, M Pohlen, GJ Bendo, et al. 2010. “Herschel Photometric Observations of the Nearby Low Metallicity Irregular Galaxy NGC 6822.” Astronomy & Astrophysics 518.
APA
Galametz, M., Madden, S., Galliano, F., Hony, S., Sauvage, M., Pohlen, M., Bendo, G., et al. (2010). Herschel photometric observations of the nearby low metallicity irregular galaxy NGC 6822. ASTRONOMY & ASTROPHYSICS, 518.
Vancouver
1.
Galametz M, Madden S, Galliano F, Hony S, Sauvage M, Pohlen M, et al. Herschel photometric observations of the nearby low metallicity irregular galaxy NGC 6822. ASTRONOMY & ASTROPHYSICS. 2010;518.
MLA
Galametz, M, SC Madden, F Galliano, et al. “Herschel Photometric Observations of the Nearby Low Metallicity Irregular Galaxy NGC 6822.” ASTRONOMY & ASTROPHYSICS 518 (2010): n. pag. Print.
@article{1236810,
  abstract     = {We present the first Herschel PACS and SPIRE images of the low-metallicity galaxy NGC 6822 observed from 70 to 500 mu m and clearly resolve the H II regions with PACS and SPIRE. We find that the ratio 250/500 is dependent on the 24 mu m surface brightness in NGC 6822, which would locally link the heating processes of the coldest phases of dust in the ISM to the star formation activity. We model the SEDs of some regions H II regions and less active regions across the galaxy and find that the SEDs of H II regions show warmer ranges of dust temperatures. We derive very high dust masses when graphite is used in our model to describe carbon dust. Using amorphous carbon, instead, requires less dust mass to account for submm emission due to its lower emissivity properties. This indicates that SED models including Herschel constraints may require different dust properties than commonly used. The global G/D of NGC 6822 is finally estimated to be 186, using amorphous carbon.},
  articleno    = {L55},
  author       = {Galametz, M and Madden, SC and Galliano, F and Hony, S and Sauvage, M and Pohlen, M and Bendo, GJ and Auld, R and Baes, Maarten and Barlow, MJ 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 Davies, JI and Dwek, E and Eales, SA and Elbaz, D and Gear, WK and Glenn, J and Gomez, HL and Griffin, M and Isaak, KG and Levenson, LR and Lu, N 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 Rangwala, N and Rigby, EE and Roussel, H and Rykala, A and Sacchi, N and Schulz, B and Schirm, MRP and Smith, MWL and Spinoglio, L and Stevens, JA and Sundar, S and Symeonidis, M and Trichas, M and Vaccari, M and Vigroux, L and Wilson, CD and Wozniak, H and Wright, GS and Zeilinger, WW},
  issn         = {0004-6361},
  journal      = {ASTRONOMY \& ASTROPHYSICS},
  keyword      = {galaxies: photometry,STAR-FORMATION HISTORY,galaxies: dwarf,galaxies: ISM,LOCAL GROUP,INTERSTELLAR DUST,INFRARED-EMISSION,AMORPHOUS-CARBON,GRAPHITE,SPITZE},
  language     = {eng},
  pages        = {6},
  title        = {Herschel photometric observations of the nearby low metallicity irregular galaxy NGC 6822},
  url          = {http://dx.doi.org/10.1051/0004-6361/201014604},
  volume       = {518},
  year         = {2010},
}

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