200 research outputs found
Low State of the X-ray Burster SLX 1732-304 in the Globular Cluster Terzan 1 According to RXTE Data
Observations of the X-ray burster SLX 1732-304 in the globular cluster Terzan
1 with the PCA/RXTE instrument in April 1997 are presented. The source was in a
low state; its flux in the standard X-ray band was half the flux recorded by
the ART-P/Granat telescope also during its low state. At the same time, its
spectrum was softer than the ART-P spectrum; it was well described by a power
law with a photon index of 2.3 without any evidence of a high-energy cutoff.Comment: 8 pages, 3 figures. Accepted to publication in Astronomy Letter
Optical Identifications of Five INTEGRAL Hard X-ray Sources in the Galactic Plane Region
The results of optical identifications of five hard X-ray sources in the
Galactic plane region from the INTEGRAL all-sky survey are presented. The X-ray
data on one source (IGRJ20216+4359) are published for the first time. The
optical observations were performed with 1.5-m RTT-150 telescope (TUBITAK
National Observatory, Antalya, Turkey) and 6-m BTA telescope (Special
Astrophysical Observatory, Nizhny Arkhyz, Russia). A blazar, three Seyfert
galaxies, and a high-mass X-ray binary are among the identified sources.Comment: 7 pages, 10 figures, Astronomy Letters, v. 34, p. 65
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