We present an algorithm for the simultaneous measurement of a pulse time-of-arrival (TOA) and dispersion measure (DM) from folded wideband pulsar data. We extend the prescription from Taylor (1992) to accommodate a general two-dimensional template "portrait", the alignment of which can be used to measure a pulse phase and DM. We show that there is a dedispersion reference frequency that removes the covariance between these two quantities, and note that the recovered pulse profile scaling amplitudes can provide useful information. We experiment with pulse modeling by using a Gaussian-component scheme that allows for independent component evolution with frequency, a "fiducial component", and the inclusion of scattering. We showcase the algorithm using our publicly available code on three years of wideband data from the bright millisecond pulsar J1824-2452A (M28A) from the Green Bank Telescope, and a suite of Monte Carlo analyses validates the algorithm. By using a simple model portrait of M28A we obtain DM trends comparable to those measured by more standard methods, with improved TOA and DM precisions by factors of a few. Measurements from our algorithm will yield precisions at least as good as those from traditional techniques, but is prone to fewer systematic effects and is without ad hoc parameters. A broad application of this new method for dispersion measure tracking with modern large-bandwidth observing systems should improve the timing residuals for pulsar timing array experiments, like the North American Nanohertz Observatory for Gravitational Waves.
Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Liebniz Universität Hannover（马克斯·普朗克引力物理学研究所（爱因斯坦研究所），莱布尼茨汉诺威大学）；School of Physics, Indian Institute of Science Education and Research Thiruvananthapuram（印度科学教育与研究学院特里凡得琅物理学院）；Joint Astronomy Programme, Department of Physics, Indian Institute of Science（印度科学学院物理学院联合天文学项目）；Vrije Universiteit Brussel（布鲁塞尔自由大学）；Raman Research Institute（拉曼研究所）；The Institute of Mathematical Sciences（数学科学研究所）；Homi Bhabha National Institute（霍米·巴巴国立研究所）；Department of Astronomy, Astrophysics, and Space Engineering, Indian Institute of Technology Indore（印度理工学院印多尔分校天文、天体物理与空间工程系）
Frequency- and phase-resolved polarimetry of millisecond pulsars and its application to timing
Monash University（莫纳什大学）；OzGrav: The ARC Centre of Excellence for Gravitational Wave Discovery（ARC引力波发现卓越中心）；Australia Telescope National Facility, CSIRO（澳大利亚国家望远镜设施，CSIRO）；Xinjiang Astronomical Observatory, Chinese Academy of Sciences（中国科学院新疆天文台）；Max Planck Institute for Gravitational Physics (Albert Einstein Institute)（马克斯·普朗克引力物理学研究所（爱因斯坦研究所））；Leibniz Universität Hannover（汉诺威莱布尼茨大学）；Hunan Normal University（湖南师范大学）
