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

M. Galametz; S.C. Madden; F. Galliano; S. Hony; M. Sauvage; M. Pohlen; G.J. Bendo; R. Auld; M. Baes; M.J. Barlow; J.J. Bock; A. Boselli; M. Bradford; V. Buat; N. Castro-Rodríguez; P. Chanial; S. Charlot; L. Ciesla; D.L. Clements; A. Cooray; D. Cormier; Luca Cortese; J.I. Davies; E. Dwek; S.A. Eales; D. Elbaz; W.K. Gear; J. Glenn; H.L. Gomez; M. Griffin; K.G. Isaak; L.R. Levenson; N. Lu; B. O'Halloran; K. Okumura; S. Oliver; M.J. Page; P. Panuzzo; A. Papageorgiou; T.J. Parkin; I. Pérez-Fournon; N. Rangwala; E.E. Rigby; H. Roussel; A. Rykala; N. Sacchi; B. Schulz; M.R.P. Schirm; M.W.L. Smith; L. Spinoglio; J.A. Stevens; S. Sundar; M. Symeonidis; M. Trichas; M. Vaccari; L. Vigroux; C.D. Wilson; H. Wozniak; G.S. Wright; W.W. Zeilinger

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

M. Galametz, S.C. Madden, F. Galliano, S. Hony, M. Sauvage, M. Pohlen, G.J. Bendo, R. Auld, M. Baes, M.J. Barlow, J.J. Bock, A. Boselli, M. Bradford, V. Buat, N. Castro-Rodríguez, P. Chanial, S. Charlot, L. Ciesla, D.L. Clements, A. CoorayD. Cormier, Luca Cortese, J.I. Davies, E. Dwek, S.A. Eales, D. Elbaz, W.K. Gear, J. Glenn, H.L. Gomez, M. Griffin, K.G. Isaak, L.R. Levenson, N. Lu, B. O'Halloran, K. Okumura, S. Oliver, M.J. Page, P. Panuzzo, A. Papageorgiou, T.J. Parkin, I. Pérez-Fournon, N. Rangwala, E.E. Rigby, H. Roussel, A. Rykala, N. Sacchi, B. Schulz, M.R.P. Schirm, M.W.L. Smith, L. Spinoglio, J.A. Stevens, S. Sundar, M. Symeonidis, M. Trichas, M. Vaccari, L. Vigroux, C.D. Wilson, H. Wozniak, G.S. Wright, W.W. Zeilinger

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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 μm and clearly resolve the H ii regions with PACS and SPIRE. We find that the ratio 250/500 is dependent on the 24 μm 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. © 2010 ESO.

Original language	English
Pages (from-to)	6
Journal	Astronomy and Astrophysics
Volume	518
Issue number	4
Publication status	Published - 2010

Cite this

Galametz, M., Madden, S. C., Galliano, F., Hony, S., Sauvage, M., Pohlen, M., Bendo, G. J., Auld, R., Baes, M., Barlow, M. J., Bock, J. J., Boselli, A., Bradford, M., Buat, V., Castro-Rodríguez, N., Chanial, P., Charlot, S., Ciesla, L., Clements, D. L., ... Zeilinger, W. W. (2010). Herschel photometric observations of the nearby low metallicity irregular galaxy NGC 6822. Astronomy and Astrophysics, 518(4), 6.

@article{9ceaa6cb81784d72940013d10d4de543,

title = "Herschel photometric observations of the nearby low metallicity irregular galaxy NGC 6822",

abstract = "We present the first Herschel PACS and SPIRE images of the low-metallicity galaxy NGC 6822 observed from 70 to 500 μm and clearly resolve the H ii regions with PACS and SPIRE. We find that the ratio 250/500 is dependent on the 24 μm 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. {\textcopyright} 2010 ESO.",

author = "M. Galametz and S.C. Madden and F. Galliano and S. Hony and M. Sauvage and M. Pohlen and G.J. Bendo and R. Auld and M. Baes and M.J. Barlow and J.J. Bock and A. Boselli and M. Bradford and V. Buat and N. Castro-Rodr{\'i}guez and P. Chanial and S. Charlot and L. Ciesla and D.L. Clements and A. Cooray and D. Cormier and Luca Cortese and J.I. Davies and E. Dwek and S.A. Eales and D. Elbaz and W.K. Gear and J. Glenn and H.L. Gomez and M. Griffin and K.G. Isaak and L.R. Levenson and N. Lu and B. O'Halloran and K. Okumura and S. Oliver and M.J. Page and P. Panuzzo and A. Papageorgiou and T.J. Parkin and I. P{\'e}rez-Fournon and N. Rangwala and E.E. Rigby and H. Roussel and A. Rykala and N. Sacchi and B. Schulz and M.R.P. Schirm and M.W.L. Smith and L. Spinoglio and J.A. Stevens and S. Sundar and M. Symeonidis and M. Trichas and M. Vaccari and L. Vigroux and C.D. Wilson and H. Wozniak and G.S. Wright and W.W. Zeilinger",

year = "2010",

language = "English",

volume = "518",

pages = "6",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

publisher = "EDP SCIENCES S A",

number = "4",

}

Galametz, M, Madden, SC, Galliano, F, Hony, S, Sauvage, M, Pohlen, M, Bendo, GJ, Auld, R, Baes, M, Barlow, MJ, Bock, JJ, Boselli, A, Bradford, M, Buat, V, Castro-Rodríguez, N, Chanial, P, Charlot, S, Ciesla, L, Clements, DL, Cooray, A, Cormier, D, Cortese, L, Davies, JI, Dwek, E, Eales, SA, Elbaz, D, Gear, WK, Glenn, J, Gomez, HL, Griffin, M, Isaak, KG, Levenson, LR, Lu, N, O'Halloran, B, Okumura, K, Oliver, S, Page, MJ, Panuzzo, P, Papageorgiou, A, Parkin, TJ, Pérez-Fournon, I, Rangwala, N, Rigby, EE, Roussel, H, Rykala, A, Sacchi, N, Schulz, B, Schirm, MRP, Smith, MWL, Spinoglio, L, Stevens, JA, Sundar, S, Symeonidis, M, Trichas, M, Vaccari, M, Vigroux, L, Wilson, CD, Wozniak, H, Wright, GS & Zeilinger, WW 2010, 'Herschel photometric observations of the nearby low metallicity irregular galaxy NGC 6822', Astronomy and Astrophysics, vol. 518, no. 4, pp. 6.

TY - JOUR

T1 - Herschel photometric observations of the nearby low metallicity irregular galaxy NGC 6822

AU - Galametz, M.

AU - Madden, S.C.

AU - Galliano, F.

AU - Hony, S.

AU - Sauvage, M.

AU - Pohlen, M.

AU - Bendo, G.J.

AU - Auld, R.

AU - Baes, M.

AU - Barlow, M.J.

AU - Bock, J.J.

AU - Boselli, A.

AU - Bradford, M.

AU - Buat, V.

AU - Castro-Rodríguez, N.

AU - Chanial, P.

AU - Charlot, S.

AU - Ciesla, L.

AU - Clements, D.L.

AU - Cooray, A.

AU - Cormier, D.

AU - Cortese, Luca

AU - Davies, J.I.

AU - Dwek, E.

AU - Eales, S.A.

AU - Elbaz, D.

AU - Gear, W.K.

AU - Glenn, J.

AU - Gomez, H.L.

AU - Griffin, M.

AU - Isaak, K.G.

AU - Levenson, L.R.

AU - Lu, N.

AU - O'Halloran, B.

AU - Okumura, K.

AU - Oliver, S.

AU - Page, M.J.

AU - Panuzzo, P.

AU - Papageorgiou, A.

AU - Parkin, T.J.

AU - Pérez-Fournon, I.

AU - Rangwala, N.

AU - Rigby, E.E.

AU - Roussel, H.

AU - Rykala, A.

AU - Sacchi, N.

AU - Schulz, B.

AU - Schirm, M.R.P.

AU - Smith, M.W.L.

AU - Spinoglio, L.

AU - Stevens, J.A.

AU - Sundar, S.

AU - Symeonidis, M.

AU - Trichas, M.

AU - Vaccari, M.

AU - Vigroux, L.

AU - Wilson, C.D.

AU - Wozniak, H.

AU - Wright, G.S.

AU - Zeilinger, W.W.

PY - 2010

Y1 - 2010

N2 - We present the first Herschel PACS and SPIRE images of the low-metallicity galaxy NGC 6822 observed from 70 to 500 μm and clearly resolve the H ii regions with PACS and SPIRE. We find that the ratio 250/500 is dependent on the 24 μm 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. © 2010 ESO.

AB - We present the first Herschel PACS and SPIRE images of the low-metallicity galaxy NGC 6822 observed from 70 to 500 μm and clearly resolve the H ii regions with PACS and SPIRE. We find that the ratio 250/500 is dependent on the 24 μm 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. © 2010 ESO.

M3 - Article

VL - 518

SP - 6

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

SN - 0004-6361

IS - 4

ER -

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

Abstract

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