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Analysis of the solar radio burst of 1993-10-02
Chin. Asrron. Asrrophys.
Vol. 21, No. 4, pp. 501-504, 1997 0 1997 Elsevier Science B.V. All rights reserved Printed in Great Britain. 02751062/97 $32.00 + 0.00 PII: SO2751062(97)00067-2
ACTA
ABSTRACTS OF OTHER PAPERS IN ASTRONOMICA SINICA 38/2 (1007) AND
ACTA ASTROPHYSICA SINICA 17/3 (1007) (Asterisks mark papers published originally in English) Horizon and the question whether galaxies receding faster than light are observable T. Kiang Dunsink Observatory, Dublin 15, Ireland If we define recession velocity as the derivative of the instantaneous (proper) distance with respect to the rmiversal time (both implicit in any non-static model that obeys the Cosmological Principle) then the title question is independent of ‘horizon”; rather, it depends on the specific form of the expansion. For the steady-state model, the answer is “no”; for all three types of the big bang model, the answer is “yes”. In particular, and more explicitly, for the k = 0 model, all galaxies with redshifts greater than 1.25 were receding fast than c at the time of emission. The widespread notion that the answer should be “no” in all cases “because such galaxies are outside our horizon” arises from the mistaken idea that recession velocity has to be defined by the relativistic Doppler shift formula and may also be due to a confusion between the cosmological and black hole situations. (AApS 1997, 17, 225-238. Full English
version
was published
in CAA 1997, 21/l,
l-18),
*Long-time variation of the correlation properties of gamma-ray bursts Institute
of High Energy
Physics,
Chinese
Academy
of Sciences,
Beijing
Li Ti-pei
100039
Systematic variations of correlation properties between different parameters of gammaray bursts are revealed from analysing the Third BATSE (3B) -y-ray burst catalog. The correlation coefficient between the burst fluence and duration was increasing with time from 1991 April to 1994 September. The correlation coefficient between the hardness and duration did not show noticeable variation for longer bursts, but was evidently increasing with time for short bursts.
(AApS
1997, 17, 256-262)
Yang Guo, Li chun-sheng, Qin Analysis of the solar radio burst of 1003-10-02 Zhi-hai & Fu Qi-jun Department of Astronomy, Nanjing University, Nanjing 210008 We confirm that some of the bursts that occurred on 1993-10-02, UT0739.5-0.45.0 at frequencies 2840-2545 MHz were microwave Type-III bursts. These bursts were produced by a bunch of relativistic electrons and moved at speeds up to 1.0 x 10’ m/s. The brightness temperature of the burst was about 10” K, and the source region had a temperature of 3x 1O’K and a size of 3.4x 10’ km. (AApS 1997, 17, 304-314) The tracking motion of the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) Su Ding-qiang & Wang Ya-nan Nanjing Astronomical Instruments Research
Center,
CAS,
Nanjing
210042
501
Vol. 21, No. 4, pp. 501-504, 1997 0 1997 Elsevier Science B.V. All rights reserved Printed in Great Britain. 02751062/97 $32.00 + 0.00 PII: SO2751062(97)00067-2
ACTA
ABSTRACTS OF OTHER PAPERS IN ASTRONOMICA SINICA 38/2 (1007) AND
ACTA ASTROPHYSICA SINICA 17/3 (1007) (Asterisks mark papers published originally in English) Horizon and the question whether galaxies receding faster than light are observable T. Kiang Dunsink Observatory, Dublin 15, Ireland If we define recession velocity as the derivative of the instantaneous (proper) distance with respect to the rmiversal time (both implicit in any non-static model that obeys the Cosmological Principle) then the title question is independent of ‘horizon”; rather, it depends on the specific form of the expansion. For the steady-state model, the answer is “no”; for all three types of the big bang model, the answer is “yes”. In particular, and more explicitly, for the k = 0 model, all galaxies with redshifts greater than 1.25 were receding fast than c at the time of emission. The widespread notion that the answer should be “no” in all cases “because such galaxies are outside our horizon” arises from the mistaken idea that recession velocity has to be defined by the relativistic Doppler shift formula and may also be due to a confusion between the cosmological and black hole situations. (AApS 1997, 17, 225-238. Full English
version
was published
in CAA 1997, 21/l,
l-18),
*Long-time variation of the correlation properties of gamma-ray bursts Institute
of High Energy
Physics,
Chinese
Academy
of Sciences,
Beijing
Li Ti-pei
100039
Systematic variations of correlation properties between different parameters of gammaray bursts are revealed from analysing the Third BATSE (3B) -y-ray burst catalog. The correlation coefficient between the burst fluence and duration was increasing with time from 1991 April to 1994 September. The correlation coefficient between the hardness and duration did not show noticeable variation for longer bursts, but was evidently increasing with time for short bursts.
(AApS
1997, 17, 256-262)
Yang Guo, Li chun-sheng, Qin Analysis of the solar radio burst of 1003-10-02 Zhi-hai & Fu Qi-jun Department of Astronomy, Nanjing University, Nanjing 210008 We confirm that some of the bursts that occurred on 1993-10-02, UT0739.5-0.45.0 at frequencies 2840-2545 MHz were microwave Type-III bursts. These bursts were produced by a bunch of relativistic electrons and moved at speeds up to 1.0 x 10’ m/s. The brightness temperature of the burst was about 10” K, and the source region had a temperature of 3x 1O’K and a size of 3.4x 10’ km. (AApS 1997, 17, 304-314) The tracking motion of the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) Su Ding-qiang & Wang Ya-nan Nanjing Astronomical Instruments Research
Center,
CAS,
Nanjing
210042
501