2010A&A...518L..55G

Query : 2010A&A...518L..55G

2010A&A...518L..55G - Astronomy and Astrophysics, volume 518, L55-55 (2010/7-2)

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

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-RODRIGUEZ N., CHANIAL P., CHARLOT S., CIESLA L., CLEMENTS D.L., COORAY A., CORMIER D., CORTESE L., DAVIES J.I., DWEK E., EALES S.A., ELBAZ D., GEAR W.K., GLENN J., GOMEZ H.L., GRIFFIN M., ISAAK K.G., LEVENSON L.R., LU N., O'HALLORAN B., OKUMURA K., OLIVER S., PAGE M.J., PANUZZO P., PAPAGEORGIOU A., PARKIN T.J., PEREZ-FOURNON I., RANGWALA N., RIGBY E.E., ROUSSEL H., RYKALA A., SACCHI N., SCHULZ B., SCHIRM M.R.P., SMITH M.W.L., SPINOGLIO L., STEVENS J.A., SUNDAR S., SYMEONIDIS M., TRICHAS M., VACCARI M., VIGROUX L., WILSON C.D., WOZNIAK H., WRIGHT G.S. and ZEILINGER W.W.

Abstract (from CDS):

We present the first Herschel PACS and SPIRE images of the low-metallicity galaxy NGC 6822 observed from 70 to 500µm and clearly resolve the HII regions with PACS and SPIRE. We find that the ratio 250/500 is dependent on the 24µm 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 HII regions and less active regions across the galaxy and find that the SEDs of HII 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.

Abstract Copyright: ∼

Journal keyword(s): galaxies: ISM - galaxies: dwarf - galaxies: photometry

Simbad objects: 7

goto Full paper

goto View the references in ADS

Number of rows : 7
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7066 0
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17434 0
3 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4450 3
4 [H25] V HII 19 44 52.84 -14 43 09.8           ~ 64 0
5 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1562 0
6 KD D26 HII 19 45 05.2 -14 43 13           ~ 52 0
7 NAME Local Group GrG ~ ~           ~ 8391 0

To bookmark this query, right click on this link: simbad:objects in 2010A&A...518L..55G and select 'bookmark this link' or equivalent in the popup menu