A dataset provided by the European Space Agency

Name 050279
Title A Search for Synchrotron X-ray Emission From Radio Quasars


DOI https://doi.org/10.5270/esa-rszcus8
Author European Space Agency
Description We propose to observe four radio quasars with unusually high X-ray/radio core
flux ratios. Such high values point to a synchrotron origin of their X-rays and
this we wish to confirm. So far only low-power blazars, the BL Lacs, were known
to have jets with synchrotron emission reaching energies as high as X-rays.
Recently, synchrotron X-rays have been convincingly detected in one radio
quasar, with suggestive evidence in four more. Establishing the existence of a
large population of such sources is vital for our understanding of jet physics.
In particular it will challenge the ..blazar sequence., a scenario which
advocates that the frequency of the synchrotron emission peak in radio quasars
is lower than that in BL Lacs since the particles in their jets suffer more severe Compton cooling.
Publication No observations found associated with the current proposal
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2007-06-05T17:34:46Z/2008-03-05T03:52:14Z
Version 17.56_20190403_1200
Mission Description The European Space Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's 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 Earth's 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.
Creator Contact https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk
Date Published 2009-04-03T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2009, A Search For Synchrotron X-Ray Emission From Radio Quasars, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-rszcus8