Other
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.352...43r&link_type=abstract
Nature (ISSN 0028-0836), vol. 352, July 4, 1991, p. 43-45. NSF-supported research.
Other
44
Gravitational Lenses, Hubble Constant, Quasars, Time Lag, Very Large Array (Vla), Gravitational Fields, Imaging Techniques, Light Curve, Red Shift
Scientific paper
The time delay for the double quasar is obtained by means of VLA observations, and the Hubble constant deduced from this method is compared to values obtained by other methods. The time delay considered is that between equivalent brightness variations in the two images, and 11 years of VLA observations contribute to the variation data. The time delay is 1.40 + or - 0.10 years, which corresponds to a higher value than calculated with optical measurement data. By considering the angular separation, the Hubble constant is found to be 46 + or - 14 (42 + or - 14) km/s/Mpc for a cosmic density parameter of 0 (1). The result is similar to the estimate by Rhee (1991), but the constant could equal 69 + or - 21 (63 +/- 21) km/s/Mpc if dark matter is present in the lensing galaxy. The scale of the universe is theorized to be known to approximately a factor of two because the results presented agree with various independent estimates.
Burke Bernard F.
Hewitt Jaqueline N.
Leh'ar Joseph
Roberts David H.
No associations
LandOfFree
The Hubble constant from VLA measurement of the time delay in the double quasar 0957 + 561 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Hubble constant from VLA measurement of the time delay in the double quasar 0957 + 561, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Hubble constant from VLA measurement of the time delay in the double quasar 0957 + 561 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-863529