ar X iv : a st ro - p h / 99 11 53 3 v 2 1 6 Ju n 20 00 The 1999 Hercules X - 1 Anomalous Low State

ar X iv : a st ro - p h / 99 11 53 3 v 1 3 0 N ov 1 99 9 The 1999 Hercules X - 1 Anomalous Low State

A failed main-on in the 35 d cycle of Her X-1 was observed with the Rossi X-ray Timing Explorer (RXTE ) on 1999 April 26. Exceptions to the normal 35 d cycle have been seen only twice before; in 1983 and again 1993. We present timing and spectral results of this latest Anomalous Low State (ALS) along with comparisons to the main-on and normal low states. Pulsations were observed in the 2.5-20 k...

ar X iv : a st ro - p h / 04 03 62 5 v 1 2 6 M ar 2 00 4 Fine - tuning the accretion disk clock in Hercules X - 1

RXTE ASM count rates from the X-ray pulsar Her X-1 began falling consistently during the late months of 2003. The source is undergoing another state transition similar to the anomalous low state of 1999. This new event has triggered observations from both space-and ground-based observatories. In order to aid data interpretation and telescope scheduling, and to facilitate the phase-connection of...

ar X iv : a st ro - p h / 99 11 43 8 v 1 2 3 N ov 1 99 9 H 2 molecules and cold clouds in cooling flow clusters †

ar X iv : a st ro - p h / 06 07 53 9 v 1 2 4 Ju l 2 00 6 CLUSTERS AND THE COSMIC WEB : Identifying the location of filaments

ar X iv : a st ro - p h / 99 06 25 1 v 1 1 5 Ju n 19 99 Inflow and outflows in NGC 2992 / 3

We present observational evidences for inflow and outflows in the interacting system Arp 245 (NGC 2992/3).