Light Curves and Radio Structure of the 1999 September Transient Event in V4641 Sagittarii (=XTE J1819−254=SAX J1819.3−2525) (original) (raw)

RADIO DETECTION OF THE SUPERNOVA REMNANT RX J0852.024622

The X-ray source RX J0852.024622 has been recently proposed as a candidate for a young nearby supernova remnant on the basis of its X-ray (¸1.3 keV) morphology, inferred internal shock velocities, and the clear detection of 44Ti emission lines. In this Letter, we report its detection at radio wavelengths (2.4 and 1.42 GHz). The radio images match the X-ray morphology very well and show a limb-brightened source with some elongated features protruding from the outer shell. These features could be explosion fragments similar to those detected in the Vela supernova remnant. At radio frequencies the source appears to be nonthermal, with an index AaS » 20.3. This synchrotron emission seems to extend up to X-ray energies, implying the existence of very high energy electrons locally accelerated in the remnant.

THE ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 113 367408, 1997 December

2007

We summarize 5 years of continuous monitoring of accretion-powered pulsars with the Burst and Transient Source Experiment (BATSE) on the Compton Gamma Ray Observatory. Our 2070 keV observations have determined or rened the orbital parameters of 13 binaries, discovered ve new transient accreting pulsars, measured the pulsed ux history during outbursts of 12 transients (GRO J1744[28, 4U 0115]634, GRO J1750[27, GS 0834[430, 2S 1417[624, GRO J1948]32, EXO 2030]375, GRO J1008[57, A0535]26, GRO J2058]42, 4U 1145[619, and A1118[616), and also measured the accretion torque history during outbursts of six of those transients whose orbital parameters were also known. We have also continuously measured the pulsed ux and spin frequency for eight persistently accreting pulsars (Her X-1, Cen X-3, Vela X-1, OAO 1657[415, GX 301[2, 4U 1626[67, 4U 1538[52, and GX 1]4). Because of their continuity and uniformity over a long baseline, BATSE observations have provided new insights into the long-term be...