THE RADIO-2 mm SPECTRAL INDEX OF THE CRAB NEBULA MEASURED WITH GISMO

被引：14

作者：

Arendt, R. G. ^{[1
,11
]}

George, J. V. ^{[2
]}

Staguhn, J. G. ^{[1
,2
,3
]}

Benford, D. J. ^{[1
]}

Devlin, M. J. ^{[4
]}

Dicker, S. R. ^{[4
]}

Fixsen, D. J. ^{[1
,2
]}

Irwin, K. D. ^{[5
]}

Jhabvala, C. A. ^{[1
]}

Korngut, P. M. ^{[4
]}

Kovacs, A. ^{[6
]}

Maher, S. F. ^{[1
,7
]}

Mason, B. S. ^{[8
]}

Miller, T. M. ^{[1
]}

Moseley, S. H. ^{[1
]}

Navarro, S. ^{[9
]}

Sievers, A. ^{[9
]}

Sievers, J. L. ^{[10
]}

Sharp, E. ^{[1
,12
]}

Wollack, E. J. ^{[1
]}

机构：

[1] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[2] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[3] Johns Hopkins Univ, Henry A Rowland Dept Phys & Astron, Baltimore, MD 21218 USA

[4] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA

[5] NIST Quantum Devices Grp, Boulder, CO 80305 USA

[6] Univ Minnesota, Dept Astron, Minneapolis, MN 55414 USA

[7] Sci Syst & Applicat Inc, Lanham, MD 20706 USA

[8] Natl Radio Astron Observ, Charlottesville, VA 22903 USA

[9] Inst Radioastron Milimetr IRAM, Granada 18012, Spain

[10] Univ Toronto, Canadian Inst Theoret Astrophys, Toronto, ON M5S 3H8, Canada

[11] Univ Maryland Baltimore Cty, CRESST, Baltimore, MD 21250 USA

[12] Global Sci & Technol Inc, Greenbelt, MD 20770 USA

来源：

ASTROPHYSICAL JOURNAL | 2011年 / 734卷 / 01期

关键词：

ISM: individual objects (Crab Nebula); ISM: supernova remnants; radiation mechanisms: non-thermal; PROBE WMAP OBSERVATIONS; PULSAR WIND NEBULAE; INFRARED OBSERVATIONS; TELESCOPE; CALIBRATION; MILLIMETER; EVOLUTION; EMISSION; WISPS; DUST;

D O I：

10.1088/0004-637X/734/1/54

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：7

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