期刊
ASTROPHYSICAL JOURNAL
卷 734, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/734/1/54
关键词
ISM: individual objects (Crab Nebula); ISM: supernova remnants; radiation mechanisms: non-thermal
资金
- INSU/CNRS (France)
- MPG (Germany)
- IGN (Spain)
- NSF [AST-0705185, AST-1020981]
- NASA [APRA 04-0055-149]
We present results of 2 mm observations of the Crab Nebula, obtained using the Goddard-IRAM Superconducting 2 Millimeter Observer (GISMO) bolometer camera on the IRAM 30 m telescope. Additional 3.3 mm observations with the MUSTANG bolometer array on the Green Bank Telescope are also presented. The integrated 2 mm flux density of the Crab Nebula provides no evidence for the emergence of a second synchrotron component that has been proposed. It is consistent with the radio power-law spectrum, extrapolated up to a break frequency of log(nu(b) [GHz]) = 2.84 +/- 0.29 or nu(b) = 695(-336)(+651) GHz. The Crab Nebula is well resolved by the similar to 16 ''.7 beam (FWHM) of GISMO. Comparison to radio data at comparable spatial resolution enables us to confirm significant spatial variation of the spectral index between 21 cm and 2 mm. The main effect is a spectral flattening in the inner region of the Crab Nebula, correlated with the toroidal structure at the center of the nebula that is prominent in the near-IR through X-ray regime.
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