no code implementations • 8 Mar 2021 • A. Ridolfi, T. Gautam, P. C. C. Freire, S. M. Ransom, S. J. Buchner, A. Possenti, V. Venkatraman Krishnan, M. Bailes, M. Kramer, B. W. Stappers, F. Abbate, E. D. Barr, M. Burgay, F. Camilo, A. Corongiu, A. Jameson, P. V. Padmanabh, L. Vleeschower, D. J. Champion, M. Geyer, A. Karastergiou, R. Karuppusamy, A. Parthasarathy, D. J. Reardon, M. Serylak, R. M. Shannon, R. Spiewak
The other three new binary pulsars (NGC 6624G, M62G, and Ter 5 an) are in wider ($> 0. 7$ days) orbits, with companions that are likely to be white dwarfs or neutron stars.
High Energy Astrophysical Phenomena
1 code implementation • 21 Jan 2021 • C. M. Fromm, Y. Mizuno, Z. Younsi, H. Olivares, O. Porth, M. De Laurentis, H. Falcke, M. Kramer, L. Rezzolla
We investigate the capability of an advanced EHT concept, including an orbiting space antenna, to image and distinguish different spacetimes around Sgr A*.
High Energy Astrophysical Phenomena Astrophysics of Galaxies General Relativity and Quantum Cosmology
no code implementations • 21 Jan 2021 • A. Parthasarathy, M. Bailes, R. M. Shannon, W. van Straten, S. Oslowski, S. Johnston, R. Spiewak, D. J. Reardon, M. Kramer, V. Venkatraman Krishnan, T. T. Pennucici, F. Abbate, S. Buchner, F. Camilo, D. J. Champion, M. Geyer, B. Hugo, A. Jameson, A. Karastergiou, M. J. Keith, M. Serylak
Using the exceptional sensitivity of MeerKAT, we explored this on the bright millisecond pulsar PSR J0437--4715 by exploring the DM of literally every pulse.
High Energy Astrophysical Phenomena
no code implementations • 21 Dec 2020 • C. Tiburzi, G. M. Shaifullah, C. G. Bassa, P. Zucca, J. P. W. Verbiest, N. K. Porayko, E. van der Wateren, R. A. Fallows, R. A. Main, G. H. Janssen, J. M. Anderson, A-. S. Bak Nielsen, J. Y. Donner, E. F. Keane, J. Künsemöller, S. Osłowski, J-. M. Grießmeier, M. Serylak, M. Brüggen, B. Ciardi, R. -J. Dettmar, M. Hoeft, M. Kramer, G. Mann, C. Vocks
In a previous paper we studied the Solar-wind (SW) models used in pulsar timing to mitigate the excess of DM annually induced by the SW, and found these to be insufficient for high-precision pulsar timing.
High Energy Astrophysical Phenomena
no code implementations • 8 Aug 2020 • M. Cruces, L. G. Spitler, P. Scholz, R. Lynch, A. Seymour, J. W. T. Hessels, C. Gouiffès, G. H. Hilmarsson, M. Kramer, S. Munjal
We model the bursts cumulative energy distribution, with energies from ${\sim}10^{38}$-$10^{39}$ erg, and find that it is well described by a power-law with slope of $\gamma=-1. 1\pm 0. 2$.
High Energy Astrophysical Phenomena Solar and Stellar Astrophysics
no code implementations • 24 Mar 2020 • S. Beurthey, N. Böhmer, P. Brun, A. Caldwell, L. Chevalier, C. Diaconu, G. Dvali, P. Freire, E. Garutti, C. Gooch, A. Hambarzumjan, S. Heyminck, F. Hubaut, J. Jochum, P. Karst, S. Khan, D. Kittlinger, S. Knirck, M. Kramer, C. Krieger, T. Lasserre, C. Lee, X. Li, A. Lindner, B. Majorovits, M. Matysek, S. Martens, E. Öz, P. Pataguppi, P. Pralavorio, G. Raffelt, J. Redondo, O. Reimann, A. Ringwald, N. Roch, K. Saikawa, J. Schaffran, A. Schmidt, J. Schütte-Engel, A. Sedlak, F. Steffen, L. Shtembari, C. Strandhagen, D. Strom, G. Wieching
In this report we present the status of the MAgnetized Disk and Mirror Axion eXperiment (MADMAX), the first dielectric haloscope for the direct search of dark matter axions in the mass range of 40 to 400 $\mu$eV.
Instrumentation and Detectors High Energy Physics - Experiment
1 code implementation • 9 Oct 2019 • V. Morello, E. F. Keane, T. Enoto, S. Guillot, W. C. G. Ho, A. Jameson, M. Kramer, B. W. Stappers, M. Bailes, E. D. Barr, S. Bhandari, M. Caleb, C. M. L. Flynn, F. Jankowski, S. Johnston, W. van Straten, Z. Arzoumanian, S. Bogdanov, K. C. Gendreau, C. Malacaria, P. S. Ray, R. A. Remillard
We report the discovery of PSR J2251$-$3711, a radio pulsar with a spin period of 12. 1 seconds, the second longest currently known.
High Energy Astrophysical Phenomena
no code implementations • 5 Feb 2019 • L. J. M. Houben, L. G. Spitler, S. ter Veen, J. P. Rachen, H. Falcke, M. Kramer
A significant variation was observed in the burst repeat rate R at L-band.
High Energy Astrophysical Phenomena
1 code implementation • 18 Jan 2019 • S. Issaoun, M. D. Johnson, L. Blackburn, C. D. Brinkerink, M. Mościbrodzka, A. Chael, C. Goddi, I. Martí-Vidal, J. Wagner, S. S. Doeleman, H. Falcke, T. P. Krichbaum, K. Akiyama, U. Bach, K. L. Bouman, G. C. Bower, A. Broderick, I. Cho, G. Crew, J. Dexter, V. Fish, R. Gold, J. L. Gómez, K. Hada, A. Hernández-Gómez, M. Janßen, M. Kino, M. Kramer, L. Loinard, R. -S. Lu, S. Markoff, D. P. Marrone, L. D. Matthews, J. M. Moran, C. Müller, F. Roelofs, E. Ros, H. Rottmann, S. Sanchez, R. P. J. Tilanus, P. de Vicente, M. Wielgus, J. A. Zensus, G. -Y. Zhao
Our long-baseline detections to ALMA also provide new constraints on the scattering of Sgr A*, and we show that refractive scattering effects are likely to be weak for images of Sgr A* at 1. 3 mm with the Event Horizon Telescope.
High Energy Astrophysical Phenomena
1 code implementation • 12 Nov 2018 • V. Morello, E. D. Barr, S. Cooper, M. Bailes, S. Bates, N. D. R. Bhat, M. Burgay, S. Burke-Spolaor, A. D. Cameron, D. J. Champion, R. P. Eatough, C. M. L. Flynn, A. Jameson, S. Johnston, M. J. Keith, E. F. Keane, M. Kramer, L. Levin, C. Ng, E. Petroff, A. Possenti, B. W. Stappers, W. van Straten, C. Tiburzi
We have also introduced an outlier detection algorithm for efficient radio-frequency interference (RFI) mitigation on folded data, a new approach that enabled the discovery of pulsars previously masked by RFI.
Instrumentation and Methods for Astrophysics High Energy Astrophysical Phenomena
1 code implementation • 14 Jun 2017 • E. F. Keane, E. D. Barr, A. Jameson, V. Morello, M. Caleb, S. Bhandari, E. Petroff, A. Possenti, M. Burgay, C. Tiburzi, M. Bailes, N. D. R. Bhat, S. Burke-Spolaor, R. P. Eatough, C. Flynn, F. Jankowski, S. Johnston, M. Kramer, L. Levin, C. Ng, W. van Straten, V. Venkatraman Krishnan
We report on the observational setup, data analysis, multi-wavelength/messenger connections, survey sensitivities to pulsars and fast radio bursts and the impact of radio frequency interference.
Instrumentation and Methods for Astrophysics High Energy Astrophysical Phenomena
1 code implementation • 30 Jun 2010 • M. J. Keith, A. Jameson, W. van Straten, M. Bailes, S. Johnston, M. Kramer, A. Possenti, S. D. Bates, N. D. R. Bhat, M. Burgay, S. Burke-Spolaor, N. D'Amico, L. Levin, P. L. McMahon, S. Milia, B. W. Stappers
Installation of a digital backend allows us to record 400 MHz of bandwidth for each beam, split into 1024 channels and sampled every 64 us.
High Energy Astrophysical Phenomena Solar and Stellar Astrophysics
