Accounting for the foreground contribution to the dust emission towards Kepler's supernova remnant |
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| Authors: | H. L. Gomez,L. Dunne,R. J. Ivison,E. M. Reynoso &dagger ,M. A. Thompson,B. Sibthorpe,S. A. Eales,T. M. DeLaney,S. Maddox, K. Isaak |
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| Affiliation: | School of Physics and Astronomy, University of Wales, Cardiff CF24 3YB;School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD;UK Astronomy Technology Centre, Royal Observatory Edinburgh, Blackford Hill, Edinburgh EH9 3HJ;Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh EH9 3HJ;Instituto de Astronomia y Física del Espacio (IAFE), CC 67, Suc. 28, 1428 Buenos Aires, Argentina;Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina;Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, College Lane, Hatfield AL10 9AB;MIT Kavli Institute, 77 Massachusetts Avenue, Room NE80-6079, Cambridge, MA 02139, USA |
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| Abstract: | 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 μm 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 , 12CO( J = 2–1) and 13CO( 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⊙ , 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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| Keywords: | Supernovae: Kepler ISM: submillimetre dust radio lines: ISM Galaxies: abundances submillimetre |
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