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The first evidence for three-dimensional spin-velocity alignment in pulsars
Jumei Yao, Weiwei Zhu, Richard N. Manchester +11
More than 50 years after the discovery of pulsars and confirmation of their association with supernova explosions, the origin of the initial spin and velocity of pulsars remains la…
Detection of pulses from the Vela pulsar at millimeter wavelengths with phased ALMA
Kuo Liu, Andre Young, Robert Wharton +20
We report on the first detection of pulsed radio emission from a radio pulsar with the ALMA telescope. The detection was made in the Band-3 frequency range (85-101 GHz) using ALMA…
CMB foreground measurements through broad-band radio spectro-polarimetry: prospects of the SKA-MPG telescope
Aritra Basu, Dominik J. Schwarz, Hans-Rainer Klöckner +4
Precise measurement of the foreground synchrotron emission, which contaminates the faint polarized cosmic microwave background radiation (CMB), is a major challenge for the next-ge…
Micro-arcsecond structure of Sagittarius A* revealed by high-sensitivity 86 GHz VLBI observations
Christiaan D. Brinkerink, Cornelia Müller, Heino D. Falcke +21
The compact radio source Sagittarius~A (Sgr~A)in the Galactic Center is the primary supermassive black hole candidate. General relativistic magnetohydrodynamical (GRMHD) si…
The Scattering and Intrinsic Structure of Sagittarius A* at Radio Wavelengths
Michael D. Johnson, Ramesh Narayan, Dimitrios Psaltis +12
Radio images of the Galactic Center supermassive black hole, Sagittarius A* (Sgr A*), are dominated by interstellar scattering. Previous studies of Sgr A* have adopted an anisotrop…
The Current Ability to Test Theories of Gravity with Black Hole Shadows
Yosuke Mizuno, Ziri Younsi, Christian M. Fromm +6
Our Galactic Center, Sagittarius A* (Sgr A*), is believed to harbour a supermassive black hole (BH), as suggested by observations tracking individual orbiting stars. Upcoming sub-m…
Radio light curve of the galaxy possibly associated with FRB150418
S. Johnston, E. F. Keane, S. Bhandari +13
We present observations made with the Australia Telescope Compact Array (ATCA), the Jansky Very Large Array (JVLA) and the Giant Metre-Wave Telescope of the radio source within the…
Asymmetric structure in Sgr A* at 3mm from closure phase measurements with VLBA, GBT and LMT
Christiaan D. Brinkerink, Cornelia Müller, Heino Falcke +19
We present the results of a closure phase analysis of 3 mm very long baseline interferometry (VLBI) measurements performed on Sagittarius A* (Sgr A*). We have analyzed observations…
Optical and radio astrometry of the galaxy associated with FRB150418
C. G. Bassa, R. Beswick, S. J. Tingay +10
A fading radio source, coincident in time and position with the fast radio burst FRB150418, has been associated with the galaxy WISE J071634.59-190039.2. Subsequent observations of…
RadioAstron Studies of the Nearby, Turbulent Interstellar Plasma With the Longest Space-Ground Interferometer Baseline
T. V. Smirnova, V. I. Shishov, M. V. Popov +14
RadioAstron space-ground VLBI observations of the pulsar B0950+08, conducted with the 10-m space radio telescope in conjunction with the Arecibo 300-m telescope and Westerbork Synt…
The Angular Broadening of the Galactic Center Pulsar SGR J1745-29: A New Constraint on the Scattering Medium
Geoffrey C. Bower, Adam Deller, Paul Demorest +6
The pulsed radio emission from the Galactic Center (GC) magnetar SGR J1745-29 probes the turbulent, magnetized plasma of the GC hyperstrong scattering screen through both angular a…
Pulsar Spin-Velocity Alignment: Kinematic Ages, Birth Periods and Braking Indices
Aristeidis Noutsos, Dominic Schnitzeler, Evan Keane +2
This paper presents a detailed investigation of the dependence of pulsar spin-velocity alignment, which has been observed for a sample of 58 pulsars, on pulsar age. At first, our s…
Pulsar Spin--Velocity Alignment: Further Results and Discussion
Aristeidis Noutsos, Michael Kramer, Paul Carr +1
The reported alignment between the projected spin-axes and proper motion directions of pulsars is revisited in the light of new data from Jodrell Bank and Effelsberg. The present i…
The relativistic pulsar-white dwarf binary PSR J1738+0333 II. The most stringent test of scalar-tensor gravity
Paulo C. C. Freire, Norbert Wex, Gilles Esposito-Farèse +7
(abridged) We report the results of a 10-year timing campaign on PSR J1738+0333, a 5.85-ms pulsar in a low-eccentricity 8.5-hour orbit with a low-mass white dwarf companion (...) T…
The Double Pulsar Eclipses I: Phenomenology and Multi-frequency Analysis
R. P. Breton, V. M. Kaspi, M. A. McLaughlin +7
The double pulsar PSR J0737-3039A/B displays short, 30 s eclipses that arise around conjunction when the radio waves emitted by pulsar A are absorbed as they propagate through the…
Evidence for gravitational quadrupole moment variations in the companion of PSR J2051-0827
K. Lazaridis, J. P. W. Verbiest, T. M. Tauris +11
We have conducted radio timing observations of the eclipsing millisecond binary pulsar J2051-0827 with the European Pulsar Timing Array network of telescopes and the Parkes radio t…
Radio and Gamma-Ray Constraints on the Emission Geometry and Birthplace of PSR J2043+2740
A. Noutsos, A. A. Abdo, M. Ackermann +146
We report on the first year of Fermi gamma-ray observations of pulsed high-energy emission from the old PSR J2043+2740. The study of the gamma-ray efficiency of such old pulsars gi…
Relativistic spin-precession in binary pulsars
Michael Kramer
After the first prediction to expect geodetic precession in binary pulsars in 1974, made immediately after the discovery of a pulsar with a companion, the effects of relativistic s…
Switched magnetospheric regulation of pulsar spin-down
Andrew Lyne, George Hobbs, Michael Kramer +2
Pulsars are famed for their rotational clock-like stability and their highly-repeatable pulse shapes. However, it has long been known that there are unexplained deviations (often t…
Precision timing of PSR J1012+5307 and strong-field GR tests
Kosmas Lazaridis, Norbert Wex, Axel Jessner +10
We report on the high precision timing analysis of the pulsar-white dwarf binary PSR J1012+5307. Using 15 years of multi-telescope data from the European Pulsar Timing Array (EPTA)…
Generic tests of the existence of the gravitational dipole radiation and the variation of the gravitational constant
K. Lazaridis, N. Wex, A. Jessner +10
We present results from the high precision timing analysis of the pulsar-white dwarf (WD) binary PSR J1012+5307 using 15 years of multi-telescope data. Observations were performed…
Discovery of three new pulsars in a 610 MHz pulsar survey with the GMRT
B. C. Joshi, M. A. McLaughlin, A. G. Lyne +6
We report on the discovery of three new pulsars in the first blind survey of the north Galactic plane (45 degrees < l < 135 degrees; |b| < 1 degrees with the Giant Meterwave Radio…