Zobrazeno 1 - 10
of 617
pro vyhledávání: '"Alexander Kate"'
Autor:
Sears, Huei, Chornock, Ryan, Blanchard, Peter, Margutti, Raffaella, Villar, V. Ashley, Pierel, Justin, Vallely, Patrick J., Alexander, Kate D., Berger, Edo, Eftekhari, Tarraneh, Jacobson-Galan, Wynn V., Laskar, Tanmoy, LeBaron, Natalie, Metzger, Brian D., Milisavljevic, Dan
GRB 221009A is one of the brightest transients ever observed with the highest peak gamma-ray flux for a gamma-ray burst (GRB). A type Ic-BL supernova (SN), SN 2022xiw, was definitively detected in late-time JWST spectroscopy (t = 195 days, observer-f
Externí odkaz:
http://arxiv.org/abs/2412.02663
Autor:
Nayana, A. J., Margutti, Raffaella, Wiston, Eli, Chornock, Ryan, Campana, Sergio, Laskar, Tanmoy, Murase, Kohta, Krips, Melanie, Migliori, Giulia, Tsuna, Daichi, Alexander, Kate D., Chandra, Poonam, Bietenholz, Michael, Berger, Edo, Chevalier, Roger A., De Colle, Fabio, Dessart, Luc, Diesing, Rebecca, Grefenstette, Brian W., Jacobson-Galan, Wynn V., Maeda, Keiichi, Marcote, Benito, Matthews, David, Milisavljevic, Dan, Ray, Alak K., Reguitti, Andrea, Polzin, Ava
We present the results from our extensive hard-to-soft X-ray (NuSTAR, Swift-XRT, XMM-Newton, Chandra) and meter-to-mm wave radio (GMRT, VLA, NOEMA) monitoring campaign of the very nearby (d $=6.9$ Mpc) Type II SN2023ixf spanning $\approx$ 4--165 d po
Externí odkaz:
http://arxiv.org/abs/2411.02647
Autor:
Ibik, Adaeze L., Drout, Maria R., Margutti, Raffaela, Matthews, David, Villar, V. Ashley, Berger, Edo, Chornock, Ryan, Alexander, Kate D., Eftekhari, Tarraneh, Laskar, Tanmoy, Lunnan, Ragnhild, Foley, Ryan J., Jones, David, Milisavljevic, Dan, Rest, Armin, Scolnic, Daniel, Williams, Peter K. G.
Luminous interacting supernovae are a class of stellar explosions whose progenitors underwent vigorous mass loss in the years prior to core-collapse. While the mechanism by which this material is ejected is still debated, obtaining the full density p
Externí odkaz:
http://arxiv.org/abs/2410.15140
Autor:
Giustini, Margherita, Miniutti, Giovanni, Arcodia, Riccardo, Goodwin, Adelle, Alexander, Kate D., Chakraborty, Joheen, Buchner, Johannes, Kosec, Peter, Saxton, Richard, Bonetti, Matteo, Franchini, Alessia, Ryu, Taeho, Shu, Xinwen, Kara, Erin, Ponti, Gabriele, Quintin, Erwan, Vincentelli, Federico, Webb, Natalie, Kajava, Jari, von Fellenberg, Sebastiano D.
Publikováno v:
A&A 692, A15 (2024)
Quasi-periodic eruptions (QPEs) are an extreme X-ray variability phenomenon associated with low-mass supermassive black holes. First discovered in the nucleus of the galaxy GSN 069, they have been so far securely detected in five other galaxies, incl
Externí odkaz:
http://arxiv.org/abs/2409.01938
Autor:
Schroeder, Genevieve, Fong, Wen-fai, Kilpatrick, Charles D., Escorial, Alicia Rouco, Laskar, Tanmoy, Nugent, Anya E., Rastinejad, Jillian, Alexander, Kate D., Berger, Edo, Brink, Thomas G., Chornock, Ryan, de Bom, Clecio R., Dong, Yuxin, Eftekhari, Tarraneh, Filippenko, Alexei V., Fuentes-Carvajal, Celeste, Jacobson-Galan, Wynn V., Malkan, Matthew, Margutti, Raffaella, Pearson, Jeniveve, Rhodes, Lauren, Salinas, Ricardo, Sand, David J., Santana-Silva, Luidhy, Santos, Andre, Sears, Huei, Shrestha, Manisha, Smith, Nathan, Webb, Wayne, de Wet, Simon, Yang, Yi
We present multiwavelength observations of the Swift short $\gamma$-ray burst GRB 231117A, localized to an underlying galaxy at redshift $z = 0.257$ at a small projected offset ($\sim 2~$kpc). We uncover long-lived X-ray (Chandra) and radio/millimete
Externí odkaz:
http://arxiv.org/abs/2407.13822
Autor:
Christy, Collin T., Alexander, Kate D., Cendes, Yvette, Chornock, Ryan, Laskar, Tanmoy, Margutti, Raffaella, Berger, Edo, Bietenholz, Michael, Coppejans, Deanne, De Colle, Fabio, Eftekhari, Tarraneh, Holoien, Thomas W. -S., Matsumoto, Tatsuya, Miller-Jones, James C. A., Ramirez-Ruiz, Enrico, Saxton, Richard, van Velzen, Sjoert, Wieringa, Mark
We present detailed radio observations of the tidal disruption event (TDE) ASASSN-19bt/AT2019ahk, obtained with the Australia Telescope Compact Array (ATCA), the Atacama Large Millimeter/submillimeter Array (ALMA), and the MeerKAT radio telescopes, s
Externí odkaz:
http://arxiv.org/abs/2404.12431
Autor:
Guolo, Muryel, Pasham, Dheeraj R., Zajaček, Michal, Coughlin, Eric R., Gezari, Suvi, Suková, Petra, Wevers, Thomas, Witzany, Vojtěch, Tombesi, Francesco, van Velzen, Sjoert, Alexander, Kate D., Yao, Yuhan, Arcodia, Riccardo, Karas, Vladimır, Miller-Jones, James, Remillard, Ronald, Gendreau, Keith, Ferrara, Elizabeth C.
Publikováno v:
Nat Astron (2024)
Galactic nuclei showing recurrent phases of activity and quiescence have recently been discovered, with recurrence times as short as a few hours to a day -- known as quasi-periodic X-ray eruption (QPE) sources -- to as long as hundreds to a thousand
Externí odkaz:
http://arxiv.org/abs/2309.03011
Autor:
Blanchard, Peter K., Villar, V. Ashley, Chornock, Ryan, Laskar, Tanmoy, Li, Yijia, Leja, Joel, Pierel, Justin, Berger, Edo, Margutti, Raffaella, Alexander, Kate D., Barnes, Jennifer, Cendes, Yvette, Eftekhari, Tarraneh, Kasen, Daniel, LeBaron, Natalie, Metzger, Brian D., Page, James Muzerolle, Rest, Armin, Sears, Huei, Siegel, Daniel M., Yadavalli, S. Karthik
Identifying the astrophysical sites of the $r$-process, one of the primary mechanisms by which heavy elements are formed, is a key goal of modern astrophysics. The discovery of the brightest gamma-ray burst of all time, GRB 221009A, at a relatively n
Externí odkaz:
http://arxiv.org/abs/2308.14197
Autor:
Cendes, Yvette, Berger, Edo, Alexander, Kate D., Chornock, Ryan, Margutti, Raffaella, Metzger, Brian, Wieringa, Mark H., Bietenholz, Michael F., Hajela, Aprajita, Laskar, Tanmoy, Stroh, Michael C., Terreran, Giacomo
Publikováno v:
The Astrophysical Journal, Volume 971, Number 2, 2024
We present radio observations of 23 optically discovered tidal disruption events (TDEs) on timescales of 500-3200 days post discovery. We detect nine new TDEs that did not have detectable radio emission at earlier times, indicating a late-time bright
Externí odkaz:
http://arxiv.org/abs/2308.13595