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; L. 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; Jason Stevens; S. Sundar; M. Symeonidis; M. Trichas; M. Vaccari; L. Vigroux; C. D. Wilson; H. Wozniak; G. S. Wright; W. W. Zeilinger

doi:10.1051/0004-6361/201014604

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, L. 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, Jason 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.

Original language	English
Article number	L55
Number of pages	6
Journal	Astronomy and Astrophysics
Volume	518
DOIs	https://doi.org/10.1051/0004-6361/201014604
Publication status	Published - 1 Jul 2010

Keywords

galaxies: ISM, galaxies: dwarf, galaxies: photometry

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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, Article L55. https://doi.org/10.1051/0004-6361/201014604

@article{c2cf790a60f7438e813b5dc5acf0f384,

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.",

keywords = "galaxies: ISM, galaxies: dwarf, galaxies: photometry",

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

year = "2010",

month = jul,

day = "1",

doi = "10.1051/0004-6361/201014604",

language = "English",

volume = "518",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

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, J, 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, L55. https://doi.org/10.1051/0004-6361/201014604

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, L.

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, Jason

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 - 2010/7/1

Y1 - 2010/7/1

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.

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.

KW - galaxies: ISM, galaxies: dwarf, galaxies: photometry

U2 - 10.1051/0004-6361/201014604

DO - 10.1051/0004-6361/201014604

M3 - Article

SN - 0004-6361

VL - 518

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - L55

ER -

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

Abstract

Keywords

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