We propose XMM-Newton/EPIC observations of J0741+2520 (35 ks) and J1639+4340 (24ks), two extremely optically luminous (Mi < -29) and moderately radio-loudquasars at high redshift (z>4). Exploratory Chandra snapshots show these objectshave larger hardness ratios than is typical for similar RLQs. We will obtainhigh-quality X-ray spectra to determine whether the spectral hardness is due toheavy intrinsic absorption or to an anomalously flat power law slope. The formeroutcome could indicate these are young quasars engaged in the process ofclearing absorbing material from near the nucleus, while the latter outcomewould require either a jet-dominated X-ray spectrum despite moderate radio-loudness or else modified disk/coronal accretion structure at high luminosity.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2013-08-02T21:41:47Z/2014-03-31T20:34:36Z
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 Brendan Miller, 2015, 'Testing for intrinsic absorption in X-ray hard comma moderately radio-loud comma z>4 RLQs', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-qu8r6on
