期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 397, 期 3, 页码 1621-1632出版社
WILEY-BLACKWELL PUBLISHING, INC
DOI: 10.1111/j.1365-2966.2009.15061.x
关键词
Supernovae: Kepler; ISM: submillimetre dust; radio lines: ISM; Galaxies: abundances; submillimetre
资金
- PIP-CONICET [114-200801-00428]
- UBACyT [X482, A023, ANPCYT-PICT-2007-00902]
- JCMT allocations [S07AU22, M07AU23]
- STFC [ST/F00298X/1, PP/D000920/1, ST/G002622/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/D000920/1, ST/F00298X/1, ST/G002622/1, PP/E001181/1] Funding Source: researchfish
Whether or not supernovae contribute significantly to the overall dust budget is a controversial subject. Submillimetre (sub-mm) observations, sensitive to cold dust, have shown an excess at 450 and 850 mu m in young remnants Cassiopeia A (Cas A) and Kepler. Some of the sub-mm emission from Cas A has been shown to be contaminated by unrelated material along the line of sight. In this paper, we explore the emission from material towards Kepler using sub-mm continuum imaging and spectroscopic observations of atomic and molecular gas, via H i, (12)CO(J = 2-1) and (13)CO(J = 2-1). We detect weak CO emission (peak T*(A) = 0.2-1 K, 1-2 km s(-1) full width at half-maximum) from diffuse, optically thin gas at the locations of some of the sub-mm clumps. The contribution to the sub-mm emission from foreground molecular and atomic clouds is negligible. The revised dust mass for Kepler's remnant is 0.1-1.2 M(circle dot), about half of the quoted values in the original study by Morgan et al., but still sufficient to explain the origin of dust at high redshifts.
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