Zobrazeno 1 - 10
of 40
pro vyhledávání: '"Lommen, Andrea N."'
Autor:
Katsuda, Satoru, Enoto, Teruaki, Lommen, Andrea N., Mori, Koji, Motizuki, Yuko, Nakajima, Motoki, Ruhl, Nathaniel C., Sato, Kosuke, Stober, Gunter, Tashiro, Makoto S., Terada, Yukikatsu, Wood, Kent S.
We present long-term density trends of the Earth's upper atmosphere at altitudes between 71 and 116 km, based on atmospheric occultations of the Crab Nebula observed with X-ray astronomy satellites, ASCA, RXTE, Suzaku, NuSTAR, and Hitomi. The combina
Externí odkaz:
http://arxiv.org/abs/2302.05335
Autor:
Hazboun, Jeffrey S., Crump, Jack, Lommen, Andrea N., Montano, Sergio, Berry, Samantha J. H., Zeldes, Jesse, Teng, Elizabeth, Ray, Paul S., Kerr, Matthew, Arzoumanian, Zaven, Bogdanov, Slavko, Deneva, Julia, Lewandowska, Natalia, Markwardt, Craig B., Ransom, Scott, Enoto, Teruaki, Wood, Kent S., Gendreau, Keith C., Howe, David A., Parthasarathy, Aditya
We have used X-ray data from the Neutron Star Interior Composition Explorer (NICER) to search for long time-scale, correlated variations ("red noise") in the pulse times of arrival from the millisecond pulsars PSR J1824$-$2452A and PSR B1937+21. Thes
Externí odkaz:
http://arxiv.org/abs/2112.02160
Pulsar Timing Arrays (PTAs) are collections of well-timed millisecond pulsars that are being used as detectors of gravitational waves (GWs). Given current sensitivity, projected improvements in PTAs and the predicted strength of the GW signals, the d
Externí odkaz:
http://arxiv.org/abs/1510.09084
Autor:
Lommen, Andrea N., Demorest, Paul
We describe the procedure, nuances, issues, and choices involved in creating times-of-arrival (TOAs), residuals and error bars from a set of radio pulsar timing data. We discuss the issue of mis-matched templates, the problem that wide- bandwidth bac
Externí odkaz:
http://arxiv.org/abs/1309.1767
Autor:
Lommen, Andrea N.
Pulsar timing now has a rich history in placing limits on the stochastic background of gravitational waves, and we plan soon to reach the sensitivity where we can detect, not just place limits on, the stochastic background. However, the capability of
Externí odkaz:
http://arxiv.org/abs/1112.2158
Publikováno v:
Astrophys.J.730:17,2011
Pulsar Timing Arrays (PTAs) use high accuracy timing of a collection of low timing noise pulsars to search for gravitational waves in the microhertz to nanohertz frequency band. The sensitivity of such a PTA depends on (a) the direction of the gravit
Externí odkaz:
http://arxiv.org/abs/1005.5163
Autor:
Finn, Lee Samuel, Lommen, Andrea N.
Publikováno v:
Astrophys.J.718:1400-1415,2010
Efforts to detect gravitational waves by timing an array of pulsars have focused traditionally on stationary gravitational waves: e.g., stochastic or periodic signals. Gravitational wave bursts --- signals whose duration is much shorter than the obse
Externí odkaz:
http://arxiv.org/abs/1004.3499
Autor:
Lommen, Andrea N., Kipphorn, Richard A., Nice, David J., Splaver, Eric M., Stairs, Ingrid H., Backer, Donald C.
Publikováno v:
Astrophys.J. 642 (2006) 1012-1017
We report the parallax and proper motion of millisecond pulsar J0030+0451, one of thirteen known isolated millisecond pulsars in the disk of the Galaxy. We obtained more than 6 years of monthly data from the 305 m Arecibo telescope at 430 MHz and 141
Externí odkaz:
http://arxiv.org/abs/astro-ph/0601521
Publikováno v:
Astrophys.J. 620 (2005) 405-415
We report on 12 years of observations of PSR J1713+0747, a pulsar in a 68-day orbit with a white dwarf. Pulse times of arrival were measured with uncertainties as small as 200 ns. The timing data yielded measurements of the relativistic Shapiro delay
Externí odkaz:
http://arxiv.org/abs/astro-ph/0410488
Autor:
Lommen, Andrea N., Backer, Donald C.
Publikováno v:
Astrophys.J. 562 (2001) 297-302
Pulsar timing measurements can be used to detect gravitational radiation from massive black hole binaries. The ~106d quasi-periodic flux variations in Sagittarius A* at radio wavelengths reported by Zhao, Bower, & Goss (2001) may be due to binarity o
Externí odkaz:
http://arxiv.org/abs/astro-ph/0107470