Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992eocm.rept..229x&link_type=abstract
In ESA, Environment Observation and Climate Modelling Through International Space Projects. Space Sciences with Particular Empha
Astronomy and Astrophysics
Astronomy
1
Bl Lacertae Objects, Correlation Coefficients, Doppler Effect, Hubble Diagram, Radio Sources (Astronomy), X Ray Sources, Correction, Plasma Jets, Red Shift, Relativistic Plasmas
Scientific paper
Based on the orientation of relativistic jets of BL Lac objects, the observed apparent magnitude of 32 radio selected, and some of 43 X-ray selected BL Lac objects were corrected for Doppler effect. The corrected magnitude shows just as good a correlation with the correlational coefficient as previous results, which imply that the redshifts of BL Lac objects are cosmological. Other results obtained are: the uncorrected X-ray selected BL Lac objects fit the Hubble diagram well although their magnitudes were corrected because of the lack of relevant parameters; consistent with the fact that the X-ray selected BL Lac objects have jets with randomly oriented directions; the results show the average redshift z = 0.23 for X-ray selected BL Lac objects, and z = 0.57 for radio selected ones; four out of five BL Lac objects whose redshifts are very uncertain fit the Hubble diagram well.
Joseph Wang C.-C.
Liu Keh-Fei
Xie G.-Zh.
Zhang Ying Hui
Zhu Yaming
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