D. Moffett

Publications (5)0 Total impact

• Conference Proceeding: Observed X-ray/Radio Correlation in the Vela Pulsar

  A Lommen, J Donovan, C Gwinn, Z Arzoumanian, A Harding, M Strickman, R Dodson, P McCulloch, D Moffett
  40 Years of Pulsars: Millisecond Pulsars, Magnetars and More; 02/2008
• Source

  Available from: arxiv.org

  Article: Correlation between X-Ray Light-Curve Shape and Radio Arrival Time in the Vela Pulsar

  A. Lommen, J. Donovan, C. Gwinn, Z. Arzoumanian, A. Harding, M. Strickman, R. Dodson, P. McCulloch, D. Moffett
  [show abstract] [hide abstract]
  ABSTRACT: We report the results of simultaneous observations of the Vela pulsar in X-rays and radio from the RXTE satellite and the Mount Pleasant Radio Observatory in Tasmania. We sought correlations between Vela's X-ray emission and radio arrival times on a pulse-by-pulse basis. At a confidence level of 99.8% we have found significantly higher flux density in Vela's main X-ray peak during radio pulses that arrived early. This excess flux shifts to the "trough" following the second X-ray peak during radio pulses that arrive later. Our results suggest that the mechanism producing the radio pulses is intimately connected to the mechanism producing X-rays. Current models using resonant absorption of radio emission in the outer magnetosphere as a cause of the X-ray emission are explored as a possible explanation for the correlation.
  apj. 03/2007; 657:436-440.
• Source

  Available from: arxiv.org

  Article: Correlations between pulsed X-ray flux and radio arrival time in the Vela pulsar

  A. N. Lommen, J. Donovan, C. Gwinn, Z. Arzoumanian, A. Harding, M. Strickman, R. Dodson, P. McCulloch, D. Moffett
  [show abstract] [hide abstract]
  ABSTRACT: We report the results of simultaneous observations of the Vela pulsar in X-rays and radio from the RXTE satellite and the Mount Pleasant Radio Observatory in Tasmania. We sought correlations between the Vela's X-ray and radio flux densities and radio arrival times on a pulse by pulse basis. We found significantly higher flux density in Vela's main X-ray peak during radio pulses that arrived early. This excess flux shifts to the 'trough' following the 2nd X-ray peak during radio pulses that arrive later. We suggest that the mechanism producing the radio pulses is intimately connected to the mechanism producing X-rays. Current models using resonant absorption in the outer magnetosphere as a cause of the radio emission, and less directly of the X-ray emission, are explored as a possible explanation for the correlation.
  02/2007;
• Source

  Available from: articles.adsabs.harvard.edu

  Conference Proceeding: Correlations Between X-ray and Radio Pulses in Vela

  J Donovan, A Lommen, Z Arzoumanian, A Harding, M Strickman, C Gwinn, R Dodson, P McCulloch, D Moffett
  Young Neutron Stars and Their Environments; 01/2004
• Conference Proceeding: Simultaneous RXTE and Radio Observations of the VELA Pulsar: Searching for Correlations

  M Strickman, C Gwinn, D Moffett, R Dodson, P McCulloch, A Harding
  AAS/High Energy Astrophysics Division #4; 04/1999