M Lyutikov
M Lyutikov
We show that intensity-dependent depolarization of single pulses may be due to the nonlinear decay of the "upper" ordinary (O) mode into an unpolarized extraordinary mode and a backward-propagating wave. The decay occurs in the innermost pa...
VM Kaspi,D Chakrabarty,J Steinberger
VM Kaspi
We report on long-term X-ray timing of two anomalous X-ray pulsars, 1RXS J170849.0-400910 and 1E 2259+586, using the Rossi X-Ray Timing Explorer. In monthly observations made over 1.4 and 2.6 yr for the two pulsars, respectively, we have ob...
A Gruzinov
A Gruzinov
The optical afterglows of the gamma-ray bursts can be strongly polarized, in principle up to tens of percents, if (1) the afterglow is synchrotron radiation from an ultrarelativistic blast, (2) the blast is beamed during the afterglow phase...
TeV Observations of Markarian 501 with the Milagrito Water Cerenkov Detector [0.03%]
TeV能量观测MARKARIAN 501的Milagrito水切伦科夫探测器
R Atkins,W Benbow,D Berley et al.
R Atkins et al.
The Milagrito water Cerenkov detector near Los Alamos, New Mexico, was operated as a sky monitor at energies of a few TeV between 1997 February and 1998 May, including the period of the strong, long-lasting 1997 flare of Markarian 501. Mila...
Evidence for an Additional Heat Source in the Warm Ionized Medium of Galaxies [0.03%]
银河系中Warm离子介质的额外热源证据
RJ Reynolds,LM Haffner,SL Tufte
RJ Reynolds
Spatial variations of the [S ii]/Halpha and [N ii]/Halpha line intensity ratios observed in the gaseous halo of the Milky Way and other galaxies are inconsistent with pure photoionization models. They appear to require a supplemental heatin...
Observational Test of Environmental Effects on the Local Group Dwarf Spheroidal Galaxies [0.03%]
环境对本地矮椭球星系影响的观测检验
N Tamura,H Hirashita
N Tamura
In this Letter, we examine whether tidal forces exerted by the Galaxy or M31 have an influence on the Local Group dwarf spheroidal galaxies (dSph's) that are their companions. We focus on the surface brightness profiles of the dSph's, espec...
YM Pihlström,RC Vermeulen,GB Taylor et al.
YM Pihlström et al.
The search for H i absorption in strong compact steep-spectrum sources is a natural way to probe the neutral gas contents in young radio sources. In turn, this may provide information about the evolution of powerful radio sources. The recen...
A Highly Doppler Blueshifted Fe-K Emission Line in the High-Redshift QSO PKS 2149-306 [0.03%]
一种高多普勒蓝移Fe-K发射线在高红移类QSOPKS 2149-306中被发现
T Yaqoob,IM George,K Nandra et al.
T Yaqoob et al.
We report the results from an ASCA observation of the high-luminosity, radio-loud quasar PKS 2149-306 (redshift 2.345), covering the approximately 1.7-30 keV band in the quasar frame. We find the source to have a luminosity approximately 6x...
A Songaila,EM Hu,LL Cowie et al.
A Songaila et al.
We report new limits on the Gunn-Peterson effect at a redshift near 5 using spectroscopic observations of the z=5 Sloan Digital Sky Survey quasar, J033829.31+002156.3, made with the Low Resolution Imaging Spectrometer (LRIS) and the High-Re...
N Benítez,JL Sanz
N Benítez
A correlation between the surface density of foreground galaxies tracing the large-scale structure and the position of distant galaxies and quasars is expected from the magnification bias effect. We show that this foreground-background corr...