no code implementations • 12 Jan 2021 • S. K. Ocker, J. M. Cordes, S. Chatterjee
We compare our analysis of the Milky Way halo with other galaxy haloes by placing limits on the scattering contributions from haloes intersecting the lines-of-sight to FRB 181112 and FRB 191108.
Astrophysics of Galaxies High Energy Astrophysical Phenomena
no code implementations • 19 Nov 2019 • K. Aggarwal, Z. Arzoumanian, P. T. Baker, A. Brazier, P. R. Brook, S. Burke-Spolaor, S. Chatterjee, J. M. Cordes, N. J. Cornish, F. Crawford, H. T. Cromartie, K. Crowter, M. DeCesar, P. B. Demorest, T. Dolch, J. A. Ellis, R. D. Ferdman, E. C. Ferrara, E. Fonseca, N. Garver-Daniels, P. Gentile, D. Good, J. S. Hazboun, A. M. Holgado, E. A. Huerta, K. Islo, R. Jennings, G. Jones, M. L. Jones, D. L. Kaplan, L. Z. Kelley, J. S. Key, M. T. Lam, T. J. W. Lazio, L. Levin, D. R. Lorimer, J. Luo, R. S. Lynch, D. R. Madison, M. A. McLaughlin, S. T. McWilliams, C. M. F. Mingarelli, C. Ng, D. J. Nice, T. T. Pennucci, N. S. Pol, S. M. Ransom, P. S. Ray, X. Siemens, J. Simon, R. Spiewak, I. H. Stairs, D. R. Stinebring, K. Stovall, J. K. Swiggum, S. R. Taylor, M. Vallisneri, R. Van Haasterer, S. J. Vigeland, C. A. Witt, W. W. Zhu
At a strain of $2. 5\times10^{-14}$, corresponding to the median upper limit as a function of source sky position, we set a limit on the rate of GW memory events at $<0. 4$ yr$^{-1}$.
High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology
no code implementations • 18 Mar 2019 • N. Pol, M. T. Lam, M. A. McLaughlin, T. J. W. Lazio, J. M. Cordes
This approach yields an integrated intergalactic DM of $\rm DM_{\rm IGM}(z = 1) = 940^{+8200}_{-200}$ pc cm$^{-3}$, with the large errors representative of the structure in the IGM.
High Energy Astrophysical Phenomena Cosmology and Nongalactic Astrophysics
no code implementations • 6 Mar 2019 • K. Gourdji, D. Michilli, L. G. Spitler, J. W. T. Hessels, A. Seymour, J. M. Cordes, S. Chatterjee
The bursts are generally detected in less than a third of the 580-MHz observing bandwidth, demonstrating that narrow-band FRB signals may be more common than previously thought.
High Energy Astrophysical Phenomena
no code implementations • 29 Jan 2019 • T. Eftekhari, E. Berger, B. Margalit, P. K. Blanchard, L. Patton, P. Demorest, P. K. G. Williams, S. Chatterjee, J. M. Cordes, R. Lunnan, B. D. Metzger, M. Nicholl
We present the detection of an unresolved radio source coincident with the position of the Type I superluminous supernova (SLSN) PTF10hgi ($z=0. 098$) about 7. 5 years post-explosion, with a flux density of $F_\nu(6\,\,{\rm GHz)}\approx 47. 3\ \mu Jy$ and a luminosity of $L_\nu(6\,\,{\rm GHz})\approx 1. 1\times 10^{28}$ erg s$^{-1}$ Hz$^{-1}$.
High Energy Astrophysical Phenomena
no code implementations • 18 Oct 2018 • P. R. Brook, A. Karastergiou, M. A. McLaughlin, M. T. Lam, Z. Arzoumanian, S. Chatterjee, J. M. Cordes, K. Crowter, M. DeCesar, P. B. Demorest, T. Dolch, J. A. Ellis, R. D. Ferdman, E. Ferrara, E. Fonseca, P. A. Gentile, G. Jones, M. L. Jones, T. J. W. Lazio, L. Levin, D. R. Lorimer, R. S. Lynch, C. Ng, D. J. Nice, T. T. Pennucci, S. M. Ransom, P. S. Ray, R. Spiewak, I. H. Stairs, D. R. Stinebring, K. Stovall, J. K. Swiggum, W. W. Zhu
The strongest evidence for long-timescale pulse profile changes is seen in PSRs B1937+21 and J1643-1224.
High Energy Astrophysical Phenomena
no code implementations • 21 Aug 2018 • D. R. Madison, J. M. Cordes, Z. Arzoumanian, S. Chatterjee, K. Crowter, M. E. DeCesar, P. B. Demorest, T. Dolch, J. A. Ellis, R. D. Ferdman, E. C. Ferrara, E. Fonseca, P. A. Gentile, G. Jones, M. L. Jones, M. T. Lam, L. Levin, D. R. Lorimer, R. S. Lynch, M. A. McLaughlin, C. M. F. Mingarelli, C. Ng, D. J. Nice, T. T. Pennucci, S. M. Ransom, P. S. Ray, R. Spiewak, I. H. Stairs, K. Stovall, J. K. Swiggum, W. Zhu
We filter out long time scale DM fluctuations attributable to structure in the interstellar medium and carry out a simultaneous analysis of all pulsars in our sample that can differentiate the correlated signature of the wind from signals unique to individual lines of sight.
Solar and Stellar Astrophysics
no code implementations • 11 Dec 2017 • M. T. Lam, J. A. Ellis, G. Grillo, M. L. Jones, J. S. Hazboun, P. R. Brook, J. E. Turner, S. Chatterjee, J. M. Cordes, T. J. W. Lazio, M. E. DeCesar, Z. Arzoumanian, H. Blumer, H. T. Cromartie, P. B. Demorest, T. Dolch, R. D. Ferdman, E. C. Ferrara, E. Fonseca, N. Garver-Daniels, P. A. Gentile, V. Gupta, D. R. Lorimer, R. S. Lynch, D. R. Madison, M. A. McLaughlin, C. Ng, D. J. Nice, T. T. Pennucci, S. M. Ransom, R. Spiewak, I. H. Stairs, D. R. Stinebring, K. Stovall, J. K. Swiggum, S. J. Vigeland, W. W. Zhu
The frequency dependence of radio pulse arrival times provides a probe of structures in the intervening media.
High Energy Astrophysical Phenomena
no code implementations • 6 Oct 2017 • M. T. Lam, M. A. McLaughlin, J. M. Cordes, S. Chatterjee, T. J. W. Lazio
We also find that arrival-time precision can be improved by increases in total bandwidth.
High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics
2 code implementations • 8 Jul 2002 • J. M. Cordes, T. J. W. Lazio
It (a) describes the distribution of the free electrons responsible for pulsar dispersion measures and thus can be used for estimating the distances to pulsars; (b) describes large-scale variations in the strength of fluctuations in electron density that underly interstellar scattering; (c) can be used to interpret interstellar scattering and scintillation observations of Galactic objects and of extragalactic objects, such as intrinsically compact AGNs and Gamma-ray burst afterglows; and (d) serves as a preliminary, smooth spatial model of the warm ionized component of the interstellar gas.
astro-ph