Radio spectral index study of the SNRs OA184 and VRO42.05.01

	Radio spectral index study of the SNRs OA184 and VRO42.05.01
	Leahy, D ; Tian, W
刊名	ASTRONOMY & ASTROPHYSICS
	2005-09-01
卷号	440 期号:3 页码:929-936
关键词	ISM : supervona remnants ISM : structure
英文摘要	New images of the Supernova Remnants (SNRs) OA184 and VRO42.05.01 are presented at 408 MHz and 1420 MHz, from the Canadian Galactic Plane Survey (CGPS) data. The SNRs' flux densities at both 408 MHz and 1420 MHz are found and corrected for flux densities from compact sources within the SNRs. The integrated flux density based spectral indices (S-nu proportional to nu(-alpha)) are 0.25 +/- 0.03 for OA184 and 0.36 +/- 0.06 for VRO42.05.01. These agree with the respective T - T plot spectral indexes of 0.23 +/- 0.06 and 0.36 +/- 0.03. OA184' s spectral index is smaller than previously published values. The older flux density values of OA184 from lower resolution data include contributions from a non-SNR ridge emission region and from compact sources within OA184. Subtracting these contributions results in a spectral index of 0.32 +/- 0.06 ( 38 MHz to 2695 MHz) or 0.28 +/- 0.06 ( 408 MHz to 2695 MHz). Correction of published flux densities for compact sources for VRO. 42.05.01 results in a spectral index of 0.32 +/- 0.05 for 38 MHz to 2695 MHz. We also find spatial variations of spectral index. For OA184 a varies from 0.1 to 0.3 ( with errors similar or equal to 0.1). For VRO42.05.01, the shell region has alpha = 0.31 and the wing region has alpha = 0.47 ( with errors similar or equal to 0.03).
收录类别	SCI
语种	英语
WOS记录号	WOS:000231689300015
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/6993]
专题	国家天文台_光学天文研究部
作者单位	1.Univ Calgary, Dept Phys & Astron, Calgary, AB T2N 1N4, Canada 2.CAS, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Leahy, D,Tian, W. Radio spectral index study of the SNRs OA184 and VRO42.05.01[J]. ASTRONOMY & ASTROPHYSICS,2005,440(3):929-936.
APA	Leahy, D,&Tian, W.(2005).Radio spectral index study of the SNRs OA184 and VRO42.05.01.ASTRONOMY & ASTROPHYSICS,440(3),929-936.
MLA	Leahy, D,et al."Radio spectral index study of the SNRs OA184 and VRO42.05.01".ASTRONOMY & ASTROPHYSICS 440.3(2005):929-936.