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Properties of low radio luminosity RGB BL LAC objects
Chen LE(陈洛恩)1,2,3; Xie GZ(谢光中)1; Ren, JY4; Zhou SB(周曙白)1,3,4; Ma L(马力)1,3,5; Chen, LE (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
Contribution Rank第1完成单位
Indexed BySCI
KeywordBl Lacertae Objects : General Galaxies : Fundamental Parameters
AbstractThe ROSAT All-Sky Survey-Green Bank (RGB) BL Lac object sample presented by Laurent-Muehleisen et al. includes not only interesting intermediate but also extreme HBL and LBL sources. These unique characteristics make it possible to unambiguously address the question of how HBLs and LBLs are related. In this paper, we study the relations between the radio-X-ray spectral index (alpha(rx)) and each of the luminosities (L-r, L-o, L-x), as well as the relation between the X-ray spectral index ( alpha x) and the radio luminosity ( Lr) for this sample. Our analysis results indicate that (1) plots of (alpha(rx), L-i) ( i denotes r, o, or x) all exhibit the continuity of alpha(rx); ( 2) of 71 low-L-r RGB BL Lac objects (L-5 GHz < 10(25) W Hz(-1)), 24% have alpha(rx) steeper than 0.75, while 79% are distributed in the region 0: 6 < alpha(rx) < 0: 9 and have such a broad scatter in alpha(rx) that alpha(rx) can range from 0.55 to 0.8 for any given value of Lr; ( 3) of 60 low-Lr RGB BL Lac objects ( with alpha(x) available), 20% have alpha(x) flatter than 1, and no correlation is present for alpha(x) versus alpha(x). In addition, no correlation is found between L-o and alpha(rx) for the RGB BL Lac sample. These characteristics seem inconsistent with those derived from the earlier classic combined surveys. From our analysis, however, we also found that (1) there is a significant anticorrelation for L-x versus alpha(rx), which agrees with that reported by Mei et al., and ( 2) more importantly, alpha(rx) is well correlated with Lr, which is consistent with the result expected in the blazar sequence but in contradiction with that derived from the DXRBS sample. All of these seemingly odd results show the importance of sampling enough parameter space in order to obtain an unbiased view or model of blazar properties.
Subject AreaAstronomy & Astrophysics
Archive Date2006-02-26
WOS IDWOS:000235131600014
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
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Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorChen, LE (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
Affiliation1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, China
2.Department of Physics, Yuxi Normal College, Yuxi 653100, China
3.Graduate School of the Chinese Academy of Sciences, Beijing, China
4.Department of Physics, Yunnan University, Kunming 650091, China
5.Physics Department, Yunnan Normal University, Kunming 650091, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Chen LE,Xie GZ,Ren, JY,et al. Properties of low radio luminosity RGB BL LAC objects[J]. ASTROPHYSICAL JOURNAL,2006,637(2):711-716.
APA Chen LE,Xie GZ,Ren, JY,Zhou SB,Ma L,&Chen, LE .(2006).Properties of low radio luminosity RGB BL LAC objects.ASTROPHYSICAL JOURNAL,637(2),711-716.
MLA Chen LE,et al."Properties of low radio luminosity RGB BL LAC objects".ASTROPHYSICAL JOURNAL 637.2(2006):711-716.
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