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- Discovery of Pulsed $\gamma$-rays from PSR J0034-0534 with the Fermi LAT: A Case for Co-located Radio and $\gamma$-ray Emission Regions doi link

Author(s): A. Abdo A., Ballet J., Bellazzini R., Bregeon J., Bruel P., M. Casandjian J., Cognard I., Cohen-Tanugi J., Desvignes G., Dumora D., Farnier C., J. Fegan S., A. Grenier I., Grondin M.-H., Guillemot L., Guiriec Sylvain, Horan D., Knodlseder J., Lemoine-Goumard M., Lott B., Nuss E., Parent D., Pelassa V., Pierbattista M., Piron F., Reposeur T., D. Scargle J., Sgro C., A. Smith D., Starck J.-L.

(Article) Published: The Astrophysical Journal / The Astrophysical Journal Letters, vol. 712 p.957-963 (2010)
Links openAccess full text : arxiv


Ref HAL: in2p3-00475596_v1
Ref Arxiv: 1002.2607
DOI: 10.1088/0004-637X/712/2/957
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
45 citations
Abstract:

Millisecond pulsars (MSPs) have been firmly established as a class of gamma-ray emitters via the detection of pulsations above 0.1 GeV from eight MSPs by the Fermi Large Area Telescope (LAT). Using thirteen months of LAT data significant gamma-ray pulsations at the radio period have been detected from the MSP PSR J0034-0534, making it the ninth clear MSP detection by the LAT. The gamma-ray light curve shows two peaks separated by 0.274$\pm$0.015 in phase which are very nearly aligned with the radio peaks, a phenomenon seen only in the Crab pulsar until now. The $\geq$0.1 GeV spectrum of this pulsar is well fit by an exponentially cutoff power law with a cutoff energy of 1.8$\pm 0.6\pm$0.1 GeV and a photon index of 1.5$\pm 0.2\pm$0.1, first errors are statistical and second are systematic. The near-alignment of the radio and gamma-ray peaks strongly suggests that the radio and gamma-ray emission regions are co-located and both are the result of caustic formation.



Comments: 20 pages, 3 figures, 2 tables. Accepted for publication in ApJ