Mathematics – Logic
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pnaoc...2..209x&link_type=abstract
Astronomical Research and Technology. Publications of National Astronomical Observatories of China (ISSN 1672-7673), Vol. 2, No.
Mathematics
Logic
Agn, Gamma-Ray-Loud-Cosmology, Observation-Cosmology, Redshift-Hubble Diagram
Scientific paper
In this work, we compile a sample which contains 71 GeV Gamma-ray-loud Active Galactic Nuclei (AGNs) (14 BL Lacs and 57 FSRQs), 53 FR I radio galaxies and 63 FR II radio galaxies. We make a nonlinear least-square fit to this sample, and find that the best fit value of the Hubble constant is H0=71.5±3.8 km s-1Mpc-1 with a reduced χ ~= 2.46 by assuming Mv = -23.0 and accepting q0 = 1.0, and the corresponding regression line has a correlation index R ~= 0.78. The best fit value of H0 = 71.5±3.8 km s-1Mpc-1 is in well agreement with H0 = 72±8 km s-1 obtained by the Hubble Space Telescope Key Project. Our results show that the GeV Gamma-ray emissions of AGNs can be used as cosmological standard candles indeed.
Du Lei-Ming
Liu Hong-Tao
Xie Zhao-Hua
Zhang Xiong
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