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Excess optical enhancement observed with arcons for early Crab giant pulses

Strader, M. J. and Johnson, M. D. and Mazin, B. A. and Spiro Jaeger, G. V. and Gwinn, C. R. and Meeker, S. R. and Szypryt, P. and van Eyken, J. C. and Marsden, D. and O'Brien, K. and Walter, A. B. and Ulbricht, G. and Stoughton, C. and Bumble, B. (2013) Excess optical enhancement observed with arcons for early Crab giant pulses. Astrophysical Journal Letters, 779 (1). Art. No. L12. ISSN 2041-8205. http://resolver.caltech.edu/CaltechAUTHORS:STRAapjl2013

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Abstract

We observe an extraordinary link in the Crab pulsar between the enhancement of an optical pulse and the timing of the corresponding giant radio pulse. At optical through infrared wavelengths, our observations use the high time resolution of ARray Camera for Optical to Near-IR Spectrophotometry, a unique superconducting energy-resolving photon-counting array at the Palomar 200 inch telescope. At radio wavelengths, we observe with the Robert C. Byrd Green Bank Telescope and the Green Bank Ultimate Pulsar Processing Instrument backend. We see an 11.3% ± 2.5% increase in peak optical flux for pulses that have an accompanying giant radio pulse arriving near the peak of the optical main pulse, in contrast to a 3.2% ± 0.5% increase when an accompanying giant radio pulse arrives soon after the optical peak. We also observe that the peak of the optical main pulse is 2.8% ± 0.8% enhanced when there is a giant radio pulse accompanying the optical interpulse. We observe no statistically significant spectral differences between optical pulses accompanied by and not accompanied by giant radio pulses. Our results extend previous observations of optical-radio correlation to the time and spectral domains. Our refined temporal correlation suggests that optical and radio emission are indeed causally linked, and the lack of spectral differences suggests that the same mechanism is responsible for all optical emission.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/2041-8205/779/1/L12DOIArticle
http://iopscience.iop.org/article/10.1088/2041-8205/779/1/L12PublisherArticle
http://arxiv.org/abs/1309.3270arXivDiscussion Paper
Additional Information:© 2013 The American Astronomical Society. Received 2013 September 10. Accepted 2013 November 8. Published 2013 November 26. The MKID detectors used in this work were developed under NASA grant NNX11AD55G. The MKID digital readout was partially developed under NASA grant NNX10AF58G. S.R.M. was supported by a NASA Office of the Chief Technologist's Space Technology Research Fellowship, NASA grant NNX11AN29H. This work was partially supported by the Keck Institute for Space Studies. C.G., M.J., and G.V.S.J. thank the U.S. National Science Foundation for financial support for this work (AST-1008865). Fermilab is operated by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the United States Department of Energy. The authors would like to thank Shri Kulkarni, Director of the Caltech Optical Observatories, and Tom Prince for facilitating this project, and would like to thank Paul Demorest for his assistance with the GBT observations. Also, the authors thank Jason Eastman for fruitful correspondence. The authors thank the referee for a careful reading and for several helpful comments. Facilities: GBT (GUPPI) - Green Bank Telescope, Hale - Palomar Observatory's 5.1m Hale Telescope
Group:Keck Institute for Space Studies
Funders:
Funding AgencyGrant Number
NASANNX11AD55G
NASANNX10AF58G
NASA Office of the Chief Technologist's Space Technology Research FellowshipNNX11AN29H
Keck Institute for Space Studies (KISS)UNSPECIFIED
NSFAST-1008865
Department of Energy (DOE)DE-AC02-07CH11359
Subject Keywords:pulsars: general; pulsars: individual (Crab: PSR B0531+21) ; stars: neutron
Record Number:CaltechAUTHORS:STRAapjl2013
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:STRAapjl2013
Official Citation:M. J. Strader et al 2013 ApJ 779 L12
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:65114
Collection:CaltechAUTHORS
Deposited By: Colette Connor
Deposited On:09 Mar 2016 19:23
Last Modified:09 Mar 2016 22:30

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