X-ray intensity and spectral variations in the BL Lac sources H2155-304 and PKS0548-322
Creators
- 1. Tata Inst. of Fundamental Research, Bombay (India)
- 2. Jet Propulsion Lab., Pasadena, CA (USA)
Description
The results from the X-ray observations of two BL Lacertae objects, H2155-304 and PKS0548-322, are presented. The observations were carried out with the HEAO-1 A2 Low Energy Detectors, the High Resolution Imager and the Monitor Proportional Counter aboard the Einstein Observatory. Correlated X-ray intensity variations of approx. 20 per cent in the 0.15-3.5 keV energy band and approx. 40 per cent in the 1.5-10 keV energy band are observed in H2155-304 over a period of about 8 hr. A factor of 2 change in the intensity of PKS0548-322 in the 3.5-10 keV energy interval is also detected over a time interval of 1 hr. Variations in the X-ray intensity over a time-scale of months and the hardening of the spectrum with increasing intensity are seen in the HEAO-1 A2 data on H2155-304. (author)
Additional details
Publishing Information
- Journal Title
- Mon. Not. R. Astron. Soc.
- Journal Volume
- 227
- Journal Issue
- 2
- Series
- Mon. Not. R. Astron. Soc.
- Journal Page Range
- 525-534
- ISSN
- 0035-8711
- CODEN
- MNRAA
INIS
- Country of Publication
- United Kingdom
- Country of Input or Organization
- United Kingdom
- INIS RN
- 18092123
- Subject category
- S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- BL LACERTAE OBJECTS; COORDINATES; COSMIC X-RAY SOURCES; EXPERIMENTAL DATA; RADIATION FLUX; SOFT X RADIATION; VARIATIONS; X-RAY SPECTRA
- Descriptors DEC
- COSMIC RADIO SOURCES; COSMIC RAY SOURCES; DATA; ELECTROMAGNETIC RADIATION; INFORMATION; IONIZING RADIATIONS; NUMERICAL DATA; RADIATIONS; SPECTRA; X RADIATION