VLA Observations of Single Pulses from the Galactic Center Magnetar

Abstract

We present the results of a 7-12 GHz phased-array study of the Galactic center magnetar J1745-2900 with the Karl G. Jansky Very Large Array (VLA). Using data from two 6.5 hour observations from September 2014, we find that the average profile is comprised of several distinct components at these epochs and is stable over $\sim$day timescales and $\sim$GHz frequencies. Comparison with additional phased VLA data at 8.7 GHz shows significant profile changes on longer timescales. The average profile at 7-12 GHz is dominated by the jitter of relatively narrow pulses. The pulses in each of the four main profile components seen in September 2014 are uncorrelated in phase and amplitude, though there is a small but significant correlation in the occurrence of pulses in two of the profile components. Using the brightest pulses, we measure the dispersion and scattering parameters of J1745-2900. A joint fit of 38 pulses gives a 10 GHz pulse broadening time of ${\tau }_{\mathrm{sc},10}=0.09\pm 0.03\mathrm{ms}$ and a dispersion measure of $\mathrm{DM}=1760_{-1.3}^{+2.4}{\mathrm{pc}\mathrm{cm}}^{-3}$. Both of these results are consistent with previous measurements, which suggests that the scattering and dispersion measure of J1745-2900 may be stable on timescales of several years.

arXiv comment20 pages, 10 figures, published in ApJ

References in corpus (31)

• emcee: The MCMC Hammer
• The NumPy array: a structure for efficient numerical computation
• DSPSR: Digital Signal Processing Software for Pulsar Astronomy
• A strong magnetic field around the supermassive black hole at the centre of the Galaxy
• Transient pulsed radio emission from a magnetar
• 1E 1547.0-5408: a radio-emitting magnetar with a rotation period of 2 seconds
• A Radio-loud Magnetar in X-ray Quiescence
• Determination of the geometry of the PSR B1913+16 system by geodetic precession
• Limitations in timing precision due to single-pulse shape variability in millisecond pulsars
• The magnetar XTE J1810-197: variations in torque, radio flux density and pulse profile morphology
• Radio properties of the magnetar near Sagittarius A* from observations with the Australia Telescope Compact Array
• Evolution of the Magnetic Field Structure of the Crab Pulsar
• Hyperstrong Radio-Wave Scattering in the Galactic Center. II. A Likelihood Analysis of Free Electrons in the Galactic Center
• Frequency-Dependent Dispersion Measures and Implications for Pulsar Timing
• Polarized radio emission from a magnetar
• Radio emission evolution, polarimetry and multifrequency single pulse analysis of the radio magnetar PSR J1622-4950
• The Angular Broadening of the Galactic Center Pulsar SGR J1745-29: A New Constraint on the Scattering Medium
• Pulse Broadening Measurements from the Galactic Center Pulsar J1745--2900
• Timing and Flux Evolution of the Galactic Center Magnetar SGR J1745-2900
• The Proper Motion of the Galactic Center Pulsar Relative to Sagittarius A*
• Multi-frequency integrated profiles of pulsars
• Simultaneous multifrequency radio observations of the Galactic Centre magnetar SGR J1745-2900
• Interstellar gas within $\sim 10$ pc of Sgr A${}^{\ast }$
• Large magnetic field variations towards the Galactic Centre magnetar, PSR J1745-2900
• The High-Density Ionized Gas in the Central Parsec of the Galaxy
• Detection of the magnetar SGR J1745-2900 up to 291 GHz with evidence of polarized millimetre emission
• Pulse Morphology of the Galactic Center Magnetar PSR J1745-2900
• Single-pulse radio observations of the Galactic Center magnetar PSR J1745-2900
• Frequency dependence of pulse width for 150 radio normal pulsars
• Simultaneous Multi-band Radio & X-ray Observations of the Galactic Center Magnetar SGR 1745$-$2900
• Single-pulse observations of the Galactic Center magnetar PSR J1745$-$2900 at 3.1 GHz

Cited by in corpus (8)

• The FRB 20121102A November rain in 2018 observed with the Arecibo Telescope
• The Breakthrough Listen Search For Intelligent Life Near the Galactic Center I
• Quasi-periodic sub-pulse structure as a unifying feature for radio-emitting neutron stars
• An 86-GHz search for Pulsars in the Galactic Center with the Atacama Large Millimeter/submillimeter Array
• Submillimeter pulsations from the magnetar XTE J1810-197
• Multi-frequency radio observations of the radio-loud magnetar XTE J1810-197
• $4-8\mathrm{GHz}$ Spectro-temporal Emission from the Galactic Center Magnetar $\mathrm{PSR}J1745-2900$
• High-cadence monitoring of the emission properties of magnetar XTE J1810-197 with the Stockert radio telescope