期刊
ASTRONOMY & ASTROPHYSICS
卷 518, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201014580
关键词
galaxies: dwarf; dust, extinction; evolution
资金
- CSA (Canada)
- NAOC (China)
- CEA (France)
- ASI (Italy)
- MCINN (Spain)
- Stockholm Observatory (Sweden)
- STFC (UK)
- NASA (USA)
- BMVIT (Austria)
- ESA-PRODEX (Belgium)
- DLR (Germany)
- CICT (Spain)
- CNES (France)
- CNRS (France)
- MCT (Spain)
- STFC [PP/E001173/1, ST/G002630/1, ST/F00267X/1, ST/F002858/1, ST/H001530/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F00267X/1, ST/G002630/1, PP/E001181/1, ST/F002858/1, PP/E001173/1] Funding Source: researchfish
- UK Space Agency [ST/G003874/1] Funding Source: researchfish
We present Herschel SPIRE and PACS photometeric observations of the low metallicity (Z similar to 0.35 Z(circle dot)) nearby dwarf galaxy, NGC 1705, in six wavelength bands as part of the Dwarf Galaxy Survey guaranteed time Herschel key program. We confirm the presence of two dominant circumnuclear IR-bright regions surrounding the central super star cluster that had been previously noted at mid-IR wavelengths and in the sub-mm by LABOCA. On constructing a global spectral energy distribution using the SPIRE and PACS photometry, in conjunction with archival IR measurements, we note the presence of an excess at sub-mm wavelengths. This excess suggests the presence of a signipcant cold dust component within NGC 1705 and was modeled as an additional cold component in the SED. Although alternative explanations for the sub-mm excess beyond 350 mu m, such as changes to the dust emissivity cannot be ruled out, the most likely explanation for the observed submillimetre excess is that of an additional cold dust component.
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