Spectral Indices of the Radio Sources

YUAN Yu-hai; LI Juan

Astronomical Research and Technology > 2007 > 4(1): 11-20.

YUAN Yu-hai, LI Juan. Spectral Indices of the Radio Sources[J]. Astronomical Research and Technology, 2007, 4(1): 11-20.

Citation:

YUAN Yu-hai, LI Juan. Spectral Indices of the Radio Sources[J]. Astronomical Research and Technology, 2007, 4(1): 11-20.

Citation:

YUAN Yu-hai, LI Juan. Spectral Indices of the Radio Sources[J]. Astronomical Research and Technology, 2007, 4(1): 11-20.

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Spectral Indices of the Radio Sources

Center for Astrophysics, Guangzhou University, Guangzhou 510006, China

Funds: This work is supported by the National 973 project (NKBRSF G19990754);the National Science Fund for Distinguished YoungScholars (10125313);the Fundfor Top Scholars of Guangdong Provience (Q02114);This research has made use of data fromthe University of Michigan Radio Astronomy Observatory which has been supported by the University of Michigan and the National Science Foundation

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Received Date: March 27, 2006
Revised Date: May 12, 2006
Published Date: January 14, 2007

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Abstract

Abstract

In this paper, 162 radio sources, including 47 BL Lacs, 21 galaxies and 94 flat spectral radio quasars (FSRQs) are studied.All sources were extracted from the University of Michigan Radio Astronomy Observatory (UMRAO)database observed by the 26-meter Michigan Radio Telescope.Most of the sources were observed at three bands 4.8GHz, 8GHz and 14.5GHz.The average flux densities of the three subclasses are calculated and the weighted average spectral index (α_wei), α_BL=0.08±0.28, α_GAL=-0.91±0.32, α_FSRQ=-0.14±0.4 are obtained.Some radio properties are discussed in this paper, including the spectral index, the relation between the flux and the redshift, the relation between the flux and the spectral index.
- AGN,
- radio sources,
- FSRQs,
- BL Lacertae objects

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