AO 0235+16 is a distant BL Lac object. The analysis of the long-term radio andoptical light curves revealed a quasi-periodicity on about 5.7 yr. The nextoutburst is foreseen to peak around February--March 2004. Moreover, short-termvariability has been detected at radio and optical frequencies as well as in anarchival XMM observation. The aim of the present proposal is to study thissource variability on both long and short time scales in the radio, optical, UV,and X-ray bands, with the joint effort of the Whole Earth Blazar Telescope, theEffelsberg radio telescope, and XMM. This would allow to recognize correlationsand possible time delays between changes at different frequencies, and hence toput strong constraints to the theoretical models.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2004-01-18T19:06:29Z/2005-01-28T19:21:19Z
Version
17.56_20190403_1200
Mission Description
The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
European Space Agency, Dr CLAUDIA M. RAITERI, 2006, 'MULTIWAVELENGTH VARIABILITY OF THE BL LAC OBJECT AO 0235+16', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-cpdt38s
