Abstract
SEVERAL recent papers1–3 have drawn attention to the interesting properties of the radio source VRO 42 22 01 and its optical counterpart BL Lac. In particular. Andrew et al.4 have reported the results of monitoring the intensity of this source at 6,630 and 10,630 MHz since December 1967, and point out particularly rapid changes in intensity at both frequencies. Seilstad and Yip5 found variations at 8,300 and 9,600 MHz, and also reported a flux density at 1,420 MHz measured in November 1968 of 4.2 flux units (1 flux unit = 10−26 W m−2 Hz−1), a value considerably below the 6.9 and 7.3 flux units reported for 1964 (ref. 6) and 1965 (ref. 7) respectively.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on SpringerLink
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
MacLeod, J. M., and Andrew, B. H., Astrophys. Lett., 1, 243 (1968).
Schmitt, J. L., Nature, 218, 663 (1968).
Dupuy, D., Schmitt, J., McClure, R., Van den Bergh, S., and Racine, R., Astrophys. J. Lett., 156, L135 (1969).
Andrew, B. H., MacLeod, J. M., Locke, J. L., Medd, W. T., and Purton, C. R., Nature, 223, 598 (1969).
Seilstad, G. A., and Yip, K. B., Nature, 222, 967 (1969).
Gait, J. A., and Kennedy, J. E. D., Astron. J., 73, 135 (1968).
Williams, P. J. S., and Stewart, P., Mon. Not. Roy. Astro. Soc., 135, 319 (1967).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
GOWER, J. Flux Density Variation in VRO 42 22 01 at 1,420 M Hz. Nature 224, 569–570 (1969). https://doi.org/10.1038/224569b0
Received:
Issue date:
DOI: https://doi.org/10.1038/224569b0
