Skip to main content

Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript.

Pulsar Nulling Phenomena

Abstract

DURING an investigation of the short-term behaviour of the radiation coming from pulsars during strong bursts, several objects were found to exhibit pulse nulling phenomena. This was first noted on analogue records of the pulsar radiation intensity where the pen deflexions are a rough measure of the pulse energy. PSR's 0834 + 06, 1133 + 16, 1237 + 25 and 1929 + 10 were found suddenly to miss from one to ten pulses at various times, termed “nulls”, during otherwise very strong and steady bursts. A null means that the pulse energy decreased by a factor of ten or more over one or two pulse periods and then increased just as sharply after the null. The nulls can be divided into two types according to their duration and their spacing. Type I nulls are the most prominent with a width between three and ten pulses and recur with spacings of about fifty pulses. Type II nulls have a width of only one or two pulses and recur with spacings of three to ten pulses. Pulse sequences from 1133 + 16 and 1237 + 25 and possibly 0834 + 06 contain the Type I nulls while sequences from all four objects contain Type II nulls. A quick look at the spacings of these nulls suggests that they may recur periodically and hence contribute to responses at characteristic periods in pulse energy fluctuation power spectra. This possibility has been reported indirectly by Sutton et al.1 and Hesse2 for the Type II nulls in 0834 + 06 and directly by Lang3 for Type I nulls in 1133 + 16 and 1237 + 25.

Access options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

References

  1. 1

    Sutton, J. M., Staelin, D. H., Price, R. M., and Weimer, R., Astrophys. J. Lett., 159, L89 (1970).

    ADS  Article  Google Scholar 

  2. 2

    Hesse, K. H., Nature, 225, 837 (1970).

    ADS  CAS  Article  Google Scholar 

  3. 3

    Lang, K. R., Astrophys. J. Lett. (in the press).

  4. 4

    Lang, K. R., Astrophys. J. Lett., 158, L175 (1969).

    ADS  Article  Google Scholar 

  5. 5

    Gold, T., Nature, 218, 731 (1968).

    ADS  Article  Google Scholar 

Download references

Author information

Affiliations

Authors

Rights and permissions

Reprints and Permissions

About this article

Cite this article

BACKER, D. Pulsar Nulling Phenomena. Nature 228, 42–43 (1970). https://doi.org/10.1038/228042a0

Download citation

Further reading

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.

Search

Quick links

Nature Briefing

Sign up for the Nature Briefing newsletter — what matters in science, free to your inbox daily.

Get the most important science stories of the day, free in your inbox. Sign up for Nature Briefing