| Full text | |
| Author(s): |
Tibbs, C. T.
[1]
;
Israel, F. P.
[2]
;
Laureijs, R. J.
[1]
;
Tauber, J. A.
[1]
;
Partridge, B.
[3]
;
Peel, M. W.
[4]
;
Fauvet, L.
[5]
Total Authors: 7
|
| Affiliation: | [1] European Space Res & Technol Ctr ESA ESTEC, Directorate Sci, Sci Support Off, Keplerlaan 1, NL-2201 AZ Noordwijk - Netherlands
[2] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden - Netherlands
[3] Haverford Coll, Dept Astron, Haverford, PA 19041 - USA
[4] Univ Sao Paulo, Inst Fis, Dept Fis Matemat, Rua Matao 1371, Sao Paulo - Brazil
[5] ARGANS Ltd, Tamar Sci Pk, Plymouth PL6 8BX, Devon - England
Total Affiliations: 5
|
| Document type: | Journal article |
| Source: | Monthly Notices of the Royal Astronomical Society; v. 477, n. 4, p. 4968-4980, JUL 2018. |
| Web of Science Citations: | 1 |
| Abstract | |
We have performed a comprehensive investigation of the global integrated flux density of M33 from radio to ultraviolet wavelengths, finding that the data between similar to 100 GHz and 3 THz are accurately described by a single modified blackbody curve with a dust temperature of T-dust = 21.67 +/- 0.30 K and an effective dust emissivity index of beta(eff) = 1.35 +/- 0.10, with no indication of an excess of emission at millimetre/submillimetre wavelengths. However, subdividing M33 into three radial annuli, we found that the global emission curve is highly degenerate with the constituent curves representing the subregions of M33. We also found gradients in T-dust and beta(eff) across the disc of M33, with both quantities decreasing with increasing radius. Comparing the M33 dust emissivity with that of other Local Group members, we find that M33 resembles the Magellanic Clouds rather than the larger galaxies, i.e. the Milky Way and M31. In the Local Group sample, we find a clear correlation between global dust emissivity and metallicity, with dust emissivity increasing with metallicity. A major aspect of this analysis is the investigation into the impact of fluctuations in the cosmic microwave background (CMB) on the integrated flux density spectrum of M33. We found that failing to account for these CMB fluctuations would result in a significant overestimate of T-dust by similar to 5K and an underestimate of beta(eff) by similar to 0.4. (AU) | |
| FAPESP's process: | 15/19936-1 - BINGO: an ultra-sensitive survey of hydrogen and radio continuum emission to measure the dark universe |
| Grantee: | Michael William Peel |
| Support Opportunities: | Research Grants - Young Investigators Grants |