Zobrazeno 1 - 10
of 108
pro vyhledávání: '"Majid, Walid A."'
Autor:
Burdge, Kevin B., Marsh, Thomas R., Fuller, Jim, Bellm, Eric C., Caiazzo, Ilaria, Chakrabarty, Deepto, Coughlin, Michael W., De, Kishalay, Dhillon, V. S., Graham, Matthew J., guez-Gil, Pablo Rodrí, Jaodand, Amruta D., Kaplan, David L., Kara, Erin, Kong, Albert K. H., Kulkarni, S. R., Li, Kwan-Lok, Littlefair, S. P., Majid, Walid A., Mróz, Przemek, Pearlman, Aaron B., Phinney, E. S., van Roestel, Jan, Simcoe, Robert A., Andreoni, Igor, Drake, Andrew J., Dekany, Richard G., Duev, Dmitry A., Kool, Erik C., Mahabal, Ashish A., Medford, Michael S., Riddle, Reed, Prince, Thomas A.
Publikováno v:
Nature 605, 41-45 (2022)
Over a dozen millisecond pulsars are ablating low-mass companions in close binary systems. In the original "black widow", the 8-hour orbital period eclipsing pulsar PSR J1959+2048 (PSR B1957+20), high energy emission originating from the pulsar is ir
Externí odkaz:
http://arxiv.org/abs/2205.02278
Autor:
Enoto, Teruaki, Ng, Mason, Hu, Chin-ping, Guver, Tolga, Jaisawal, Gaurava K., O'Connor, Brendan, Gogus, Ersin, Lien, Amy, Kisaka, Shota, Wadiasingh, Zorawar, Majid, Walid A., Pearlman, Aaron B., Arzoumanian, Zaven, Bansal, Karishma, Blumer, Harsha, Chakrabarty, Deepto, Gendreau, Keith, Ho, Wynn C. G., Kouveliotou, Chryssa, Ray, Paul S., Strohmayer, Tod E., Younes, George, Palmer, David M., Sakamoto, Takanori, Akahori, Takuya, Eie, Sujin
The soft gamma-ray repeater Swift J1555.2-5402 was discovered by means of a 12-ms duration short burst detected with Swift BAT on 2021 June 3. Then 1.6 hours after the first burst detection, NICER started daily monitoring of this X-ray source for a m
Externí odkaz:
http://arxiv.org/abs/2108.02939
Autor:
Majid, Walid A., Pearlman, Aaron B., Prince, Thomas A., Wharton, Robert S., Naudet, Charles J., Bansal, Karishma, Bhardwaj, Mohit, Tendulkar, Shriharsh P.
Publikováno v:
ApJL 919, L6 (2021)
We present the detection of a bright radio burst at radio frequencies between 2.2--2.3 GHz with the NASA Deep Space Network (DSN) 70 m dish (DSS-63) in Madrid, Spain from FRB~20200120E. This repeating fast radio burst (FRB) was recently discovered by
Externí odkaz:
http://arxiv.org/abs/2105.10987
Autor:
Enoto, Teruaki, Terasawa, Toshio, Kisaka, Shota, Hu, Chin-Ping, Guillot, Sebastien, Lewandowska, Natalia, Malacaria, Christian, Ray, Paul S., Ho, Wynn C. G., Harding, Alice K., Okajima, Takashi, Arzoumanian, Zaven, Gendreau, Keith C., Wadiasingh, Zorawar, Markwardt, Craig B., Soong, Yang, Kenyon, Steve, Bogdanov, Slavko, Majid, Walid A., Güver, Tolga, Jaisawal, Gaurava K., Foster, Rick, Murata, Yasuhiro, Takeuchi, Hiroshi, Takefuji, Kazuhiro, Sekido, Mamoru, Yonekura, Yoshinori, Misawa, Hiroaki, Tsuchiya, Fuminori, Aoki, Takahiko, Tokumaru, Munetoshi, Honma, Mareki, Kameya, Osamu, Oyama, Tomoaki, Asano, Katsuaki, Shibata, Shinpei, Tanaka, Shuta J.
Giant radio pulses (GRPs) are sporadic bursts emitted by some pulsars, lasting a few microseconds. GRPs are hundreds to thousands of times brighter than regular pulses from these sources. The only GRP-associated emission outside radio wavelengths is
Externí odkaz:
http://arxiv.org/abs/2104.03492
Autor:
Pearlman, Aaron B., Majid, Walid A., Prince, Thomas A., Nimmo, Kenzie, Hessels, Jason W. T., Naudet, Charles J., Kocz, Jonathon
The spectra of fast radio bursts (FRBs) encode valuable information about the source's local environment, underlying emission mechanism(s), and the intervening media along the line of sight. We present results from a long-term multiwavelength radio m
Externí odkaz:
http://arxiv.org/abs/2009.13559
Autor:
Younes, George, Guver, Tolga, Kouveliotou, Chryssa, Baring, Matthew G., Hu, Chin-Ping, Wadiasingh, Zorawar, Begicarslan, Beste, Enoto, Teruaki, Gogus, Ersin, Lin, Lin, Harding, Alice K., van der Horst, Alexander J., Majid, Walid A., Guillot, Sebastien, Malacaria, Christian
We report on NICER observations of the Magnetar SGR~1935+2154, covering its 2020 burst storm and long-term persistent emission evolution up to $\sim90$ days post outburst. During the first 1120~seconds taken on April 28 00:40:58 UTC we detect over 21
Externí odkaz:
http://arxiv.org/abs/2009.07886
Autor:
Hu, Chin-Ping, Begicarslan, Beste, Guver, Tolga, Enoto, Teruaki, Younes, George, Sakamoto, Takanori, Ray, Paul S., Strohmayer, Tod E., Guillot, Sebastien, Arzoumanian, Zaven, Palmer, David M., Gendreau, Keith C., Malacaria, C., Wadiasingh, Zorawar, Jaisawal, Gaurava K., Majid, Walid A.
We report on the hard X-ray burst and the first ~100 days NICER monitoring of the soft X-ray temporal and spectral evolution of the newly-discovered magnetar Swift J1818.0-1607. The burst properties are typical of magnetars with a duration of $T_{90}
Externí odkaz:
http://arxiv.org/abs/2009.00231
Autor:
Pearlman, Aaron B., Majid, Walid A., Prince, Thomas A., Ray, Paul S., Kocz, Jonathon, Horiuchi, Shinji, Naudet, Charles J., Güver, Tolga, Enoto, Teruaki, Arzoumanian, Zaven, Gendreau, Keith C., Ho, Wynn C. G.
Magnetars are young, rotating neutron stars that possess larger magnetic fields ($B$ $\approx$ $10^{13}$-$10^{15}$ G) and longer rotational periods ($P$ $\approx$ 1-12 s) than ordinary pulsars. In contrast to rotation-powered pulsars, magnetar emissi
Externí odkaz:
http://arxiv.org/abs/2005.08410
Autor:
Majid, Walid A., Pearlman, Aaron B., Nimmo, Kenzie, Hessels, Jason W. T., Prince, Thomas A., Naudet, Charles J., Kocz, Jonathon, Horiuchi, Shinji
Publikováno v:
ApJL 897, L4 (2020)
The spectra of repeating fast radio bursts (FRBs) are complex and time-variable, sometimes peaking within the observing band and showing a fractional emission bandwidth of about 10-30%. These spectral features may provide insight into the emission me
Externí odkaz:
http://arxiv.org/abs/2004.06845
Autor:
Guver, Tolga, Gogus, Ersin, Vurgun, Eda, Enoto, Teruaki, Gendreau, Keith C., Sakamoto, Takanori, Gotthelf, Eric V., Arzoumanian, Zaven, Guillot, Sebastien, Jaisawal, Gaurava K., Malacaria, Christian, Majid, Walid A.
We present the earliest available soft X-ray observations of XTE J1810-187, the prototypical transient magnetar, obtained 75--84 days after its 2018 outburst with the Neutron Star Interior Composition Explorer (NICER). Using a series of observations
Externí odkaz:
http://arxiv.org/abs/1905.04440