DETECTION AND FLUX DENSITY MEASUREMENTS OF THE MILLISECOND PULSAR J2145–0750 BELOW 100 MHz
J. DowellDepartment of Physics and Astronomy, University of New Mexico, Albuquerque, NM 87131, USA; [email protected]P. S. RaySpace Science Division, Naval Research Laboratory, Washington, DC 20375, USAG. B. TaylorDepartment of Physics and Astronomy, University of New Mexico, Albuquerque, NM 87131, USA; [email protected]J. N. BlytheSchool of Physics, Georgia Institute of Technology, Atlanta, GA 3033, USAT. ClarkeU.S. Naval Research Laboratory, Washington, DC 20375, USAJ. CraigDepartment of Physics and Astronomy, University of New Mexico, Albuquerque, NM 87131, USA; [email protected]S. W. EllingsonBradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA 24061, USAJ. F. HelmboldtU.S. Naval Research Laboratory, Washington, DC 20375, USAP. A. HenningDepartment of Physics and Astronomy, University of New Mexico, Albuquerque, NM 87131, USA; [email protected]T. J. W. LazioJet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USAF. SchinzelDepartment of Physics and Astronomy, University of New Mexico, Albuquerque, NM 87131, USA; [email protected]K. StovallC. N. WolfeBradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA 24061, USA
2013en
ABI
Аннотация
We present flux density measurements and pulse profiles for the millisecond pulsar PSR J2145-0750 spanning 37 to 81 MHz using data obtained from the first station of the Long Wavelength Array. These measurements represent the lowest frequency detection of pulsed emission from a millisecond pulsar to date. We find that the pulse profile is similar to that observed at 102 MHz. We also find that the flux density spectrum between ~40 MHz to 5 GHz is suggestive of a break and may be better fit by a model that includes spectral curvature with a rollover around 730 MHz rather than a single power law.
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