Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...637..711c&link_type=abstract
The Astrophysical Journal, Volume 637, Issue 2, pp. 711-716.
Astronomy and Astrophysics
Astronomy
1
Galaxies: Bl Lacertae Objects: General, Galaxies: Fundamental Parameters
Scientific paper
The 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 (αrx) and each of the luminosities (Lr, Lo, Lx), as well as the relation between the X-ray spectral index (αx) and the radio luminosity (Lr) for this sample. Our analysis results indicate that (1) plots of (αrx, Li) (i denotes r, o, or x) all exhibit the continuity of αrx (2) of 71 low-Lr RGB BL Lac objects (L5GHz<1025 W Hz-1), 24% have αrx steeper than 0.75, while 79% are distributed in the region 0.6<αrx<0.9 and have such a broad scatter in αrx that αrx can range from 0.55 to 0.8 for any given value of Lr; (3) of 60 low-Lr RGB BL Lac objects (with αx available), 20% have αx flatter than 1, and no correlation is present for Lr versus αx. In addition, no correlation is found between Lo and αrx 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 Lx versus αrx, which agrees with that reported by Mei et al., and (2) more importantly, αrx 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.
Chen Luo-En
Ma Liangping
Ren Ji-Yang
Xie G.-Zh.
Zhou B. S.
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