Zobrazeno 1 - 10
of 194
pro vyhledávání: '"Hoefer, C."'
Autor:
Brackenhoff, S. A., Mevius, M., Koopmans, L. V. E., Offringa, A., Ceccotti, E., Chege, J. K., Gehlot, B. K., Ghosh, S., Höfer, C., Mertens, F. G., Munshi, S., Zaroubi, S.
The turbulent ionosphere causes phase shifts to incoming radio waves on a broad range of temporal and spatial scales. When an interferometer is not sufficiently calibrated for the direction-dependent ionospheric effects, the time-varying phase shifts
Externí odkaz:
http://arxiv.org/abs/2407.20220
Autor:
Chege, J. K., Koopmans, L. V. E., Offringa, A. R., Gehlot, B. K., Brackenhoff, S. A., Ceccotti, E., Ghosh, S., Höfer, C., Mertens, F. G., Mevius, M., Munshi, S.
Current radio interferometers output multi-petabyte-scale volumes of data per year making the storage, transfer, and processing of this data a sizeable challenge. This challenge is expected to grow with the next-generation telescopes such as the Squa
Externí odkaz:
http://arxiv.org/abs/2407.11557
Autor:
Munshi, S., Mertens, F. G., Koopmans, L. V. E., Offringa, A. R., Ceccotti, E., Brackenhoff, S. A., Chege, J. K., Gehlot, B. K., Ghosh, S., Höfer, C., Mevius, M.
One of the main obstacles preventing the detection of the redshifted 21-cm signal from neutral hydrogen in the early Universe is the astrophysical foreground emission, which is several orders of magnitude brighter than the signal. The foregrounds, du
Externí odkaz:
http://arxiv.org/abs/2407.10686
Autor:
Munshi, S., Mertens, F. G., Koopmans, L. V. E., Offringa, A. R., Semelin, B., Aubert, D., Barkana, R., Bracco, A., Brackenhoff, S. A., Cecconi, B., Ceccotti, E., Corbel, S., Fialkov, A., Gehlot, B. K., Ghara, R., Girard, J. N., Grießmeier, J. M., Höfer, C., Hothi, I., Mériot, R., Mevius, M., Ocvirk, P., Shaw, A. K., Theureau, G., Yatawatta, S., Zarka, P., Zaroubi, S.
Publikováno v:
A&A 681, A62 (2024)
The redshifted 21 cm signal from neutral hydrogen is a direct probe of the physics of the early universe and has been an important science driver of many present and upcoming radio interferometers. In this study we use a single night of observations
Externí odkaz:
http://arxiv.org/abs/2311.05364
Autor:
Gehlot, B. K., Koopmans, L. V. E., Brackenhoff, S. A., Ceccotti, E., Ghosh, S., Höfer, C., Mertens, F. G., Mevius, M., Munshi, S., Offringa, A. R., Pandey, V. N., Rowlinson, A., Shulevski, A., Wijers, R. A. M. J., Yatawatta, S., Zaroubi, S.
Publikováno v:
A&A 681, A71 (2024)
Measurement of the redshifted 21-cm signal of neutral hydrogen from the Cosmic Dawn (CD) and Epoch of Reionisation (EoR) promises to unveil a wealth of information about the astrophysical processes during the first billion years of evolution of the u
Externí odkaz:
http://arxiv.org/abs/2311.03023
Autor:
Collaboration, CHIME/Pulsar, Amiri, M., Bandura, K. M., Boyle, P. J., Brar, C., Cliche, J. F., Crowter, K., Cubranic, D., Demorest, P. B., Denman, N. T., Dobbs, M., Dong, F. Q., Fandino, M., Fonseca, E., Good, D. C., Halpern, M., Hill, A. S., Höfer, C., Kaspi, V. M., Landecker, T. L., Leung, C., Lin, H. -H., Luo, J., Masui, K. W., McKee, J. W., Mena-Parra, J., Meyers, B. W., Michilli, D., Naidu, A., Newburgh, L., Ng, C., Patel, C., Pinsonneault-Marotte, T., Ransom, S. M., Renard, A., Scholz, P., Shaw, J. R., Sikora, A. E., Stairs, I. H., Tan, C. M., Tendulkar, S. P., Tretyakov, I., Vanderlinde, K., Wang, H., Wang, X.
We present the design, implementation and performance of a digital backend constructed for the Canadian Hydrogen Intensity Mapping Experiment (CHIME) that uses accelerated computing to observe radio pulsars and transient radio sources. When operating
Externí odkaz:
http://arxiv.org/abs/2008.05681
Autor:
Collaboration, The CHIME/FRB, Andersen, B. C., Bandura, K. M., Bhardwaj, M., Bij, A., Boyce, M. M., Boyle, P. J., Brar, C., Cassanelli, T., Chawla, P., Chen, T., Cliche, J. -F., Cook, A., Cubranic, D., Curtin, A. P., Denman, N. T., Dobbs, M., Dong, F. Q., Fandino, M., Fonseca, E., Gaensler, B. M., Giri, U., Good, D. C., Halpern, M., Hill, A. S., Hinshaw, G. F., Höfer, C., Josephy, A., Kania, J. W., Kaspi, V. M., Landecker, T. L., Leung, C., Li, D. Z., Lin, H. -H., Masui, K. W., Mckinven, R., Mena-Parra, J., Merryfield, M., Meyers, B. W., Michilli, D., Milutinovic, N., Mirhosseini, A., Münchmeyer, M., Naidu, A., Newburgh, L. B., Ng, C., Patel, C., Pen, U. -L., Pinsonneault-Marotte, T., Pleunis, Z., Quine, B. M., Rafiei-Ravandi, M., Rahman, M., Ransom, S. M., Renard, A., Sanghavi, P., Scholz, P., Shaw, J. R., Shin, K., Siegel, S. R., Singh, S., Smegal, R. J., Smith, K. M., Stairs, I. H., Tan, C. M., Tendulkar, S. P., Tretyakov, I., Vanderlinde, K., Wang, H., Wulf, D., Zwaniga, A. V.
Magnetars are highly magnetized young neutron stars that occasionally produce enormous bursts and flares of X-rays and gamma-rays. Of the approximately thirty magnetars currently known in our Galaxy and Magellanic Clouds, five have exhibited transien
Externí odkaz:
http://arxiv.org/abs/2005.10324
Autor:
Collaboration, The CHIME/FRB, Amiri, M., Andersen, B. C., Bandura, K. M., Bhardwaj, M., Boyle, P. J., Brar, C., Chawla, P., Chen, T., Cliche, J. F., Cubranic, D., Deng, M., Denman, N. T., Dobbs, M., Dong, F. Q., Fandino, M., Fonseca, E., Gaensler, B. M., Giri, U., Good, D. C., Halpern, M., Hessels, J. W. T., Hill, A. S., Höfer, C., Josephy, A., Kania, J. W., Karuppusamy, R., Kaspi, V. M., Keimpema, A., Kirsten, F., Landecker, T. L., Lang, D. A., Leung, C., Li, D. Z., Lin, H. -H., Marcote, B., Masui, K. W., Mckinven, R., Mena-Parra, J., Merryfield, M., Michilli, D., Milutinovic, N., Mirhosseini, A., Naidu, A., Newburgh, L. B., Ng, C., Nimmo, K., Paragi, Z., Patel, C., Pen, U. -L., Pinsonneault-Marotte, T., Pleunis, Z., Rafiei-Ravandi, M., Rahman, M., Ransom, S. M., Renard, A., Sanghavi, P., Scholz, P., Shaw, J. R., Shin, K., Siegel, S. R., Singh, S., Smegal, R. J., Smith, K. M., Stairs, I. H., Tendulkar, S. P., Tretyakov, I., Vanderlinde, K., Wang, H., Wang, X., Wulf, D., Yadav, P., Zwaniga, A. V.
Publikováno v:
Nature, Volume 582, page 351--355 (2020)
Fast radio bursts (FRBs) are bright, millisecond-duration radio transients originating from extragalactic distances. Their origin is unknown. Some FRB sources emit repeat bursts, ruling out cataclysmic origins for those events. Despite searches for p
Externí odkaz:
http://arxiv.org/abs/2001.10275
Autor:
Collaboration, The CHIME/FRB, Andersen, B. C., Bandura, K., Bhardwaj, M., Boubel, P., Boyce, M. M., Boyle, P. J., Brar, C., Cassanelli, T., Chawla, P., Cubranic, D., Deng, M., Dobbs, M., Fandino, M., Fonseca, E., Gaensler, B. M., Gilbert, A. J., Giri, U., Good, D. C., Halpern, M., Hill, A. S., Hinshaw, G., Höfer, C., Josephy, A., Kaspi, V. M., Kothes, R., Landecker, T. L., Lang, D. A., Li, D. Z., Lin, H. -H., Masui, K. W., Mena-Parra, J., Merryfield, M., Mckinven, R., Michilli, D., Milutinovic, N., Naidu, A., Newburgh, L. B., Ng, C., Patel, C., Pen, U., Pinsonneault-Marotte, T., Pleunis, Z., Rafiei-Ravandi, M., Rahman, M., Ransom, S. M., Renard, A., Scholz, P., Siegel, S. R., Singh, S., Smith, K. M., Stairs, I. H., Tendulkar, S. P., Tretyakov, I., Vanderlinde, K., Yadav, P., Zwaniga, A. V.
We report on the discovery of eight repeating fast radio burst (FRB) sources found using the Canadian Hydrogen Intensity Mapping Experiment (CHIME) telescope. These sources span a dispersion measure (DM) range of 103.5 to 1281 pc cm$^{-3}$. They disp
Externí odkaz:
http://arxiv.org/abs/1908.03507
Autor:
Collaboration, CHIME/FRB, Amiri, Mandana, Bandura, Kevin, Bhardwaj, Mohit, Boubel, Paula, Boyce, Michelle M., Boyle, Patrick J., Brar, Charanjot, Burhanpurkar, Maya, Chawla, Pragya, Cliche, Jean F., Cubranic, Davor, Deng, Meiling, Denman, Nolan, Dobbs, Matthew, Fandino, M., Fonseca, Emmanuel, Gaensler, Bryan M., Gilbert, Adam J., Giri, Utkarsh, Good, Deborah C., Halpern, Mark, Hanna, David, Hill, Alexander S., Hinshaw, Gary, Höfer, C., Josephy, Alexander, Kaspi, Victoria M., Landecker, Thomas L., Lang, Dustin A., Masui, Kiyoshi W., Mckinven, Ryan, Mena-Parra, Juan, Merryfield, Marcus, Milutinovic, Nikola, Moatti, Charles, Naidu, Arun, Newburgh, Laura B., Ng, Cherry, Patel, Chitrang, Pen, Ue-Li, Pinsonneault-Marotte, Tristan, Pleunis, Ziggy, Rafiei-Ravandi, Masoud, Ransom, Scott M., Renard, Andre, Scholz, Paul, Shaw, J. R., Siegel, Seth R., Smith, Kendrick M., Stairs, Ingrid H., Tendulkar, Shriharsh P., Tretyakov, Ian, Vanderlinde, Keith, Yadav, Prateek
Fast radio bursts (FRBs) are highly dispersed millisecond-duration radio flashes likely arriving from far outside the Milky Way galaxy. This phenomenon was discovered at radio frequencies near 1.4 GHz and to date has been observed in one case at as h
Externí odkaz:
http://arxiv.org/abs/1901.04524