Zobrazeno 1 - 10
of 105
pro vyhledávání: '"P. K. G. Williams"'
Autor:
Y. Dong, T. Eftekhari, W. Fong, S. Bhandari, E. Berger, O. S. Ould-Boukattine, J. W. T. Hessels, N. Sridhar, A. Reines, B. Margalit, J. Darling, A. C. Gordon, J. E. Greene, C. D. Kilpatrick, B. Marcote, B. D. Metzger, K. Nimmo, A. E. Nugent, Z. Paragi, P. K. G. Williams
Publikováno v:
The Astrophysical Journal, Vol 973, Iss 2, p 133 (2024)
We present 1–12 GHz Karl G. Jansky Very Large Array observations of nine off-nuclear persistent radio sources (PRSs) in nearby ( z ≲ 0.055) dwarf galaxies, along with high-resolution European VLBI Network observations for one of them at 1.7 GHz.
Externí odkaz:
https://doaj.org/article/2934cd9b41cf4de7ba597e58c1beafcc
Publikováno v:
The Astronomical Journal, Vol 168, Iss 3, p 127 (2024)
We present results from a search for radio emission in 77 stellar systems hosting 140 exoplanets, predominantly within 17.5 pc using the Very Large Array (VLA) at 4–8 GHz. This is the largest and most sensitive search to date for radio emission in
Externí odkaz:
https://doaj.org/article/70e6f5187e7e414ba195059e9d017dbd
Autor:
Zhilei Xu, Honggeun Kim, Jacqueline N. Hewitt, Kai-Feng Chen, Nicholas S. Kern, Eleanor Rath, Ruby Byrne, Adélie Gorce, Robert Pascua, Zachary E. Martinot, Joshua S. Dillon, Bryna J. Hazelton, Adrian Liu, Miguel F. Morales, Zara Abdurashidova, Tyrone Adams, James E. Aguirre, Paul Alexander, Zaki S. Ali, Rushelle Baartman, Yanga Balfour, Adam P. Beardsley, Gianni Bernardi, Tashalee S. Billings, Judd D. Bowman, Richard F. Bradley, Philip Bull, Jacob Burba, Steven Carey, Chris L. Carilli, Carina Cheng, David R. DeBoer, Eloy de Lera Acedo, Matt Dexter, Nico Eksteen, John Ely, Aaron Ewall-Wice, Nicolas Fagnoni, Randall Fritz, Steven R. Furlanetto, Kingsley Gale-Sides, Brian Glendenning, Deepthi Gorthi, Bradley Greig, Jasper Grobbelaar, Ziyaad Halday, Jack Hickish, Daniel C. Jacobs, Austin Julius, MacCalvin Kariseb, Joshua Kerrigan, Piyanat Kittiwisit, Saul A. Kohn, Matthew Kolopanis, Adam Lanman, Paul La Plante, Anita Loots, David Harold Edward MacMahon, Lourence Malan, Cresshim Malgas, Keith Malgas, Bradley Marero, Andrei Mesinger, Mathakane Molewa, Tshegofalang Mosiane, Steven G. Murray, Abraham R. Neben, Bojan Nikolic, Hans Nuwegeld, Aaron R. Parsons, Nipanjana Patra, Samantha Pieterse, Nima Razavi-Ghods, James Robnett, Kathryn Rosie, Peter Sims, Craig Smith, Hilton Swarts, Jianrong Tan, Nithyanandan Thyagarajan, Pieter van Wyngaarden, Peter K. G. Williams, Haoxuan Zheng, HERA Collaboration
Publikováno v:
The Astrophysical Journal, Vol 971, Iss 1, p 16 (2024)
The key to detecting neutral hydrogen during the epoch of reionization (EoR) is to separate the cosmological signal from the dominating foreground radiation. We developed direct optimal mapping (DOM) to map interferometric visibilities; it contains o
Externí odkaz:
https://doaj.org/article/1a882c9d538c4f4fa5c2e99826bf43d8
Millimeter Observations of the Type II SN 2023ixf: Constraints on the Proximate Circumstellar Medium
Autor:
Edo Berger, Garrett K. Keating, Raffaella Margutti, Keiichi Maeda, Kate D. Alexander, Yvette Cendes, Tarraneh Eftekhari, Mark Gurwell, Daichi Hiramatsu, Anna Y. Q. Ho, Tanmoy Laskar, Ramprasad Rao, Peter K. G. Williams
Publikováno v:
The Astrophysical Journal Letters, Vol 951, Iss 2, p L31 (2023)
We present 1.3 mm (230 GHz) observations of the recent and nearby Type II supernova, SN 2023ixf, obtained with the Submillimeter Array (SMA) at 2.6–18.6 days after explosion. The observations were obtained as part the SMA Large Program, POETS (Purs
Externí odkaz:
https://doaj.org/article/a29d752f3c61408eba53368280b903ad
Autor:
Tanmoy Laskar, Kate D. Alexander, Raffaella Margutti, Tarraneh Eftekhari, Ryan Chornock, Edo Berger, Yvette Cendes, Anne Duerr, Daniel A. Perley, Maria Edvige Ravasio, Ryo Yamazaki, Eliot H. Ayache, Thomas Barclay, Rodolfo Barniol Duran, Shivani Bhandari, Daniel Brethauer, Collin T. Christy, Deanne L. Coppejans, Paul Duffell, Wen-fai Fong, Andreja Gomboc, Cristiano Guidorzi, Jamie A. Kennea, Shiho Kobayashi, Andrew Levan, Andrei P. Lobanov, Brian D. Metzger, Eduardo Ros, Genevieve Schroeder, P. K. G. Williams
Publikováno v:
The Astrophysical Journal Letters, Vol 946, Iss 1, p L23 (2023)
GRB 221009A ( z = 0.151) is one of the closest known long γ -ray bursts (GRBs). Its extreme brightness across all electromagnetic wavelengths provides an unprecedented opportunity to study a member of this still-mysterious class of transients in exq
Externí odkaz:
https://doaj.org/article/a685bea0c1264ca0ba1b4cab5853f084
Autor:
Ava Polzin, Raffaella Margutti, Deanne L. Coppejans, Katie Auchettl, Kim L. Page, Georgios Vasilopoulos, Joe S. Bright, Paolo Esposito, Peter K. G. Williams, Koji Mukai, Edo Berger
Publikováno v:
The Astrophysical Journal, Vol 959, Iss 2, p 75 (2023)
We present a detailed compilation and analysis of the X-ray phase space of low- to intermediate-redshift (0 ≤ z ≤ 1) transients that consolidates observed light curves (and theory where necessary) for a large variety of classes of transient/varia
Externí odkaz:
https://doaj.org/article/7af8d65a387b41ee8edaa6d7af8db53b
Autor:
The HERA Collaboration: Zara Abdurashidova, Tyrone Adams, James E. Aguirre, Paul Alexander, Zaki S. Ali, Rushelle Baartman, Yanga Balfour, Rennan Barkana, Adam P. Beardsley, Gianni Bernardi, Tashalee S. Billings, Judd D. Bowman, Richard F. Bradley, Daniela Breitman, Philip Bull, Jacob Burba, Steve Carey, Chris L. Carilli, Carina Cheng, Samir Choudhuri, David R. DeBoer, Eloy de Lera Acedo, Matt Dexter, Joshua S. Dillon, John Ely, Aaron Ewall-Wice, Nicolas Fagnoni, Anastasia Fialkov, Randall Fritz, Steven R. Furlanetto, Kingsley Gale-Sides, Hugh Garsden, Brian Glendenning, Adélie Gorce, Deepthi Gorthi, Bradley Greig, Jasper Grobbelaar, Ziyaad Halday, Bryna J. Hazelton, Stefan Heimersheim, Jacqueline N. Hewitt, Jack Hickish, Daniel C. Jacobs, Austin Julius, Nicholas S. Kern, Joshua Kerrigan, Piyanat Kittiwisit, Saul A. Kohn, Matthew Kolopanis, Adam Lanman, Paul La Plante, David Lewis, Adrian Liu, Anita Loots, Yin-Zhe Ma, David H. E. MacMahon, Lourence Malan, Keith Malgas, Cresshim Malgas, Matthys Maree, Bradley Marero, Zachary E. Martinot, Lisa McBride, Andrei Mesinger, Jordan Mirocha, Mathakane Molewa, Miguel F. Morales, Tshegofalang Mosiane, Julian B. Muñoz, Steven G. Murray, Vighnesh Nagpal, Abraham R. Neben, Bojan Nikolic, Chuneeta D. Nunhokee, Hans Nuwegeld, Aaron R. Parsons, Robert Pascua, Nipanjana Patra, Samantha Pieterse, Yuxiang Qin, Nima Razavi-Ghods, James Robnett, Kathryn Rosie, Mario G. Santos, Peter Sims, Saurabh Singh, Craig Smith, Hilton Swarts, Jianrong Tan, Nithyanandan Thyagarajan, Michael J. Wilensky, Peter K. G. Williams, Pieter van Wyngaarden, Haoxuan Zheng
Publikováno v:
The Astrophysical Journal, Vol 945, Iss 2, p 124 (2023)
We report the most sensitive upper limits to date on the 21 cm epoch of reionization power spectrum using 94 nights of observing with Phase I of the Hydrogen Epoch of Reionization Array (HERA). Using similar analysis techniques as in previously repor
Externí odkaz:
https://doaj.org/article/ccbac6f812eb4a529df00c97b35f91cd
Autor:
T. Eftekhari, E. Berger, B. D. Metzger, T. Laskar, V. A. Villar, K. D. Alexander, G. P. Holder, J. D. Vieira, N. Whitehorn, P. K. G. Williams
Publikováno v:
The Astrophysical Journal, 935, 1-19
The Astrophysical Journal, 935, 1, pp. 1-19
The Astrophysical Journal, 935, 1, pp. 1-19
The next generation of wide-field cosmic microwave background (CMB) surveys are uniquely poised to open a new window for time-domain astronomy in the millimeter band. Here we explore the discovery phase space for extragalactic transients with near-te
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8d6953abc7188227d9528d38a84e8e06
http://arxiv.org/abs/2110.05494
http://arxiv.org/abs/2110.05494
We present the first systematic search for GHz frequency radio emission from directly imaged exoplanets using Very Large Array (VLA) observations of sufficient angular resolution to separate the planets from their host stars. We obtained results for
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fd2b820a5df46634bda5232aa9666588
http://arxiv.org/abs/2106.14994
http://arxiv.org/abs/2106.14994
Autor:
K. D. Alexander, G. Schroeder, K. Paterson, W. Fong, P. Cowperthwaite, S. Gomez, B. Margalit, R. Margutti, E. Berger, P. Blanchard, R. Chornock, T. Eftekhari, T. Laskar, B. D. Metzger, M. Nicholl, V. A. Villar, P. K. G. Williams
GW190814 was a compact object binary coalescence detected in gravitational waves by Advanced LIGO and Advanced Virgo that garnered exceptional community interest due to its excellent localization and the uncertain nature of the binary's lighter-mass
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9de552a858a17566921ca4572266011a