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Fifteen Months of Pulsar Astronomy

Published online by Cambridge University Press:  25 April 2016

V. Radhakrishnan
V. Radhakrishnan*
Affiliation:
Division of Radiophysics, CSIRO, Sydney
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Extract

Towards the end of February 1968 the astronomical world was staggered by a paper from the Milliard Radio Observatory at Cambridge announcing the discovery of an astonishing periodic phenomenon. The characteristics of the pulsating radio source—or pulsar as it came to be called—involved a fantastic multiplicity of time-scales. The duration of the individual events was measured in tens of milliseconds, the repetition rate was of the order of a second, the pulse amplitude showed drastic variations over times of seconds, minutes, hours and even months and, lastly, the stability of the basic periodicity indicated a time-scale of millions of years. A series of pulses from CP 1919, the first pulsar, is shown in Figure 1, and one notices here both the regularity of the pulses and the variation in their amplitude with time. When the individual pulses were observed on an expanded time-scale it was found that the pulses were made up of sub-pulses (Figure 2) and that there was considerable structure even down to a millisecond time-scale.

Type
Invited Papers
Information
Publications of the Astronomical Society of Australia , Volume 1 , Issue 6 , September 1969 , pp. 254 - 263
Copyright
Copyright © Astronomical Society of Australia 1969

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References

1 Hewish, A., Bell, S. J., Pilkington, J. D. H., Scott, P. F. and Collins, R. A., Nature, 217, 709 (1968).Google Scholar
2 Davies, J. G., Horton, P. W., Lyne, A. G., Rickett, B. J. and Smith, F. G., Nature, 217, 910 (1968).Google Scholar
3 Drake, F. D., Science, 160, 416 (1968).Google Scholar
4 Robinson, B. J., Cooper, B. F. C., Gardner, F. F., Wielebinski, R. and Landecker, T. L., Nature, 218, 1143 (1968).Google Scholar
5 Oppenheimer, J. R. and Volkhoff, G., Phys. Rev., 55, 374 (1939).CrossRefGoogle Scholar
6 Chiu, H. Y., ‘Quasi-Stellar objects and gravitational collapse’, p. 408, University of Chicago Press, Chicago 1965.Google Scholar
7 Mills, B. Y., Proc. ASA, 1, 176 (1969).Google Scholar
8 Vaughan, A. E., Large, M. I. and Wielebinski, R., Nature, 222, 963 (1969).Google Scholar
9 Large, M. I., Vaughan, A. E. and Wielebinski, R., Astrophys. Lett., 3, 123 (1969).Google Scholar
10 Hamilton, P. A., reported at ASA meeting, Hobart, May 1969.Google Scholar
11 Abies, J. G., reported at ASA meeting, Hobart, May 1969.Google Scholar
12 Lovelace, R. V. E., Sutton, J. M. and Salpeter, E. E., Nature, 222, 231 (1969).Google Scholar
13 Woltjer, L., Ap. J., 152, L179 (1968).Google Scholar
14 Large, M. I., Vaughan, A. E. and Mills, B. Y., Nature, 220, 340 (1968).CrossRefGoogle Scholar
15 Thorne, K. S. and Ipser, J. R., Ap. J. Lett., 152, L71 (1968).CrossRefGoogle Scholar
16 Skilling, J., Nature, 218, 923 (1968).CrossRefGoogle Scholar
17 Ostriker, J. P. and Tassoul, J. L., Nature, 219, 577 (1968).Google Scholar
18 Bailey, J. A., and Mackay, C. D., Nature, 218, 129 (1968).CrossRefGoogle Scholar
19 Kristian, J., Ap. J., 154, L99 (1968).Google Scholar
20 Ostriker, J., Nature, 217, 1227 (1968).CrossRefGoogle Scholar
21 Staelin, D. H. and Reifenstein, E. C. III, IAU Circ, No. 2110 (1968).Google Scholar
22 Lovelace, R. V. E., Sutton, J. M. and Craft, H. D. Jr., IAU Circ, No. 2113 (1968).Google Scholar
23 Radhakrishnan, V. and Murray, J., Proc. ASA, 1, 215 (1969).Google Scholar
24 Mebold, U., Beitr. Z. Radio Astronomie, 1, No. 4 (1969).Google Scholar
25 Clark, B. G., Ap. J., 142, 1398 (1965).Google Scholar
26 Shuter, W. L. H. and Verschuur, G. L., MNRAS, 127, 387 (1964).Google Scholar
27 Rohlfs, K., Grewing, M. and Mebold, U., Preprint, Astronomical Institute of Bonn (1969).Google Scholar
28 Shuter, W. L. H., Venugopal, V. R. and Mohoney, M. J., Nature, 220, 356 (1968).Google Scholar
29 de Jager, G., Lyne, A. G., Pointon, L. and Ponsonby, J. E. B., Nature, 220, 128 (1968).Google Scholar
30 Guelin, M., Guibert, J., Huchtmeier, W. and Weliachew, L., Nature, 221, 249 (1969).Google Scholar
31 Gordon, C. P., Gordon, K. J. and Shalloway, A. M., Nature, 222, 129 (1969).Google Scholar
32 Hjellming, R. M., Gordon, C. P. and Gordon, K. J., Preprint, National Radio Astronomy Observatory (1969).Google Scholar
33 Manchester, R. N., Murray, J. D. and Radhakrishnan, V., in preparation.Google Scholar
34 Trimble, V., A.J., 73, 535 (1968).CrossRefGoogle Scholar
35 Milne, D. K., Aust. J. Phys., 21, 201 (1968).Google Scholar
36 Komesaroff, M. M., Morris, D. and Cooke, D. J., in preparation.Google Scholar
37 Davidson, K. and Terzian, Y., Nature, 221, 729 (1969).CrossRefGoogle Scholar
38 Scheuer, P. A. G., Nature, 218, 920 (1968).Google Scholar
39 Komesaroff, M. M., McCulloch, P. M., Hamilton, P. A. and Cooke, D. J., Nature, 220, 358 (1968).Google Scholar
40 Slee, O. B., Komesaroff, M. M. and McCulloch, P. M., Nature, 219, 342 (1968).Google Scholar
41 Conklin, E. K., Howard, H. T., Craft, H. D. Jr., and Cornelia, J. M., Nature, 219, 1239 (1968).Google Scholar
42 Salpeter, E. E., Nature, 221, 31 (1969).Google Scholar
43 Rickett, B. J., Nature, 221, 158 (1969).CrossRefGoogle Scholar
44 Lyne, A. G. and Smith, F. G., Nature, 218, 124 (1968).Google Scholar
45 Smith, F. G., Nature, 218, 325 (1968).Google Scholar
46 Smith, F. G., Nature, 220, 891 (1968).Google Scholar
47 Staelin, D. H. and Reifenstein, E. C., Ap. J., 156, L121 (1969).Google Scholar
48 Roger, R. S. and Shuter, W. L. H., Nature, 218, 1036 (1968).CrossRefGoogle Scholar
49 Goldstein, S. J. Jr., and Meisel, D. D., Science, 163, 810 (1969).Google Scholar
50 Radhakrishnan, V., Cooke, D. J., Komesaroff, M. M. and Morris, D., Nature, 221, 443 (1969).Google Scholar
51 Radhakrishnan, V. and Cooke, D. J., Astrophys. Lett., 3, 225 (1969).Google Scholar
52 Ekers, R. D., Lecqueux, J., Moffet, A. T. and Seielstad, G. A., Ap. J., 156, L21 (1969).Google Scholar
53 Verschuur, G. L., Preprint, National Radio Astronomy Observatory (1969).Google Scholar
54 Verschuur, G. L., Ap. J., 155, L155 (1969).Google Scholar
55 Seielstad, G. A., Morris, D. and Radhakrishnan, V., Ap., J. 140, 53 (1964).CrossRefGoogle Scholar
56 Drake, F. D. and Craft, H. D. Jr., Nature, 220, 231 (1968).CrossRefGoogle Scholar
57 Slee, O. B., Proc. ASA, 1, 223 (1969).Google Scholar
58 Slee, O. B., personal communication.Google Scholar
59 Maran, S. P. and Cameron, A. G. W., “Progress report on pulsars’, private circular, 1969.Google Scholar
60 Gold, T., Nature, 218, 731 (1968).Google Scholar
61 Eastlund, B. J., Nature, 220, 1293 (1968).Google Scholar
62 Pacini, F., Nature, 219, 145 (1968).Google Scholar
63 Richards, D., IAU Circ, No. 2114 (1968).Google Scholar
64 Gold, T., Nature, 221, 25 (1969).Google Scholar
65 Finzi, A. and Wolf, R. A., Ap. J., 155, L107 (1969).Google Scholar
66 Wheeler, J., Ann. Rev. Astron. Astrophys., 4, 423 (1966).CrossRefGoogle Scholar
67 Pacini, F., Nature, 216, 567 (1967).Google Scholar
68 Mayall, N. U., Science, 137, 91 (1962).Google Scholar
69 Shklovsky, I. S., ‘Cosmic radio waves’, pp. 271–341, Harvard University Press, Cambridge, Mass. 1960.Google Scholar
70 Cocke, W. J., Disney, M. J. and Taylor, D. J., Nature, 221, 525 (1969).Google Scholar
71 Nather, R. E., Warner, B. and MacFarlane, M., Nature, 221, 527 (1969).Google Scholar
72 Lynds, R., Maran, S. P. and Trumbo, D. E., Ap. J., 155, L121 (1969).CrossRefGoogle Scholar
73 Warner, B., Nather, R. E. and MacFarlane, M., Nature, 222, 233 (1969).Google Scholar
74 Wampler, E. J., Scargle, J. D. and Miller, J. S., Contributions from the Lick Observatory, No. 303 (1969).Google Scholar
75 Oke, J. B., Ap. J., 156, 491 (1969).Google Scholar
76 Lynds, R., Preprint, Kitt Peak National Observatory (1969).Google Scholar
77 Neugebauer, G., Becklin, E. E., Kristian, J., Leighton, R. B., Snellen, G. and Westphal, J. A., Ap. J., 156, L115 (1969).Google Scholar
78 Fritz, G., Henry, R. C, Meekins, J. F., Chubb, T. A. and Friedman, H., IAU Circ, No. 2141 (1969).Google Scholar
79 Bradt, H., Rappaport, S., Mayer, W., Nather, R. E., Warner, B., MacFarlane, M. and Kristian, J., Nature, 222, 728 (1969).Google Scholar
80 Fishman, G. J., Harnden, F. R. Jr., and Haymes, R. C., Ap. J., 156, L107 (1969).Google Scholar
81 Goldreich, P., Proc. ASA, 1, 227 (1969).Google Scholar
82 Gunn, J. E. and Ostriker, J. P., Nature, 221, 454 (1969).Google Scholar
83 Deutsch, A., Annales d’ Astrophysique, 18, 1 (1955).Google Scholar
84 Gunn, J. E. and Ostriker, J. P., Preprint, Princeton University Observatory (1969).Google Scholar
85 Cole, T. W., Nature, 221, 29 (1969).Google Scholar
86 Davies, J. G., Hunt, G. C. and Smith, F. G., Nature, 221, 27 (1969).Google Scholar
87 Grewing, M. and Priester, W., Astronomical Institute of Bonn (1969).Google Scholar
88 Pacini, F. and Salpeter, E. E., Nature, 218, 733 (1968).Google Scholar
89 Reichley, P. E. and Downs, G. S., Nature, 222, 229 (1969).Google Scholar
90 Radhakrishnan, V. and Manchester, R. N., Nature, 222, 228 (1969).Google Scholar
91 Cocconi, G., Preprint, CERN, Geneva 1969.Google Scholar
92 Feldman, P. A., Silk, J. I. and Schwartz, R. A., Preprint, Institute of Theoretical Astronomy, Cambridge 1969.Google Scholar
93 Cameron, A. G. W. and Greenstein, G. S., Nature, 222, 863 (1969).Google Scholar
94 Chandrasekhar, S., private communication.Google Scholar
95 Clark, R. R. and Smith, F. G., Nature, 221, 724 (1969).Google Scholar
96 Bohm-Viterse, E., Ap. J., 156, L131 (1969).CrossRefGoogle Scholar
97 Craft, H. D. Jr., Cornelia, J. M. and Drake, F. D., Nature, 218, 1122 (1968).Google Scholar
98 Ekers, R. D. and Moffet, A. T., Nature, 220, 756 (1968).CrossRefGoogle Scholar
99 Downs, G. S., Morris, G. A. and Reichley, P. E., Nature, 222, 1257 (1969).Google Scholar
100 Lang, K. R. and Bosque, B., IAU Circ, No. 2137 (1969).Google Scholar
101 Large, M. I., Vaughan, A. E. and Wielebinski, R., Preprint, Cornell-Sydney University Astronomy Centre.Google Scholar
102 Cole, T. W., Nature, 223, 487 (1969).Google Scholar