A dataset provided by the European Space Agency

Name 076074
Title Weak Line Quasars at High Redshift: Extremely High Accretion Rate Sources?


DOI https://doi.org/10.5270/esa-8viqc0l
Author Prof Ohad Shemmer
Description The Sloan Digital Sky Survey has discovered a remarkable group of virgul100 quasars
with extremely weak emission lines in their rest-frame optical-UV spectra. We
propose to extend our XMM-Newton observations of such sources and obtain imaging
spectroscopy of five quasars of this class with a total exposure time of 102 ks,
providing virgul1000 photons per source. This will enable an accurate measurement of
the hard-X-ray photon index required for a robust determination of the accretion
rate in each source. Steep spectral slopes will indicate that high accretion
rates may be responsible for the intrinsic weakness of the optical-UV emission
lines. The proposed observations will yield crucial insights about the accretion
process and broad emission line formation in all active galactic nuclei.
Publication No observations found associated with the current proposal
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2015-06-10T07:53:36Z/2015-10-15T20:25:52Z
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 2016-11-02T23:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Prof Ohad Shemmer, 2016, 076074, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-8viqc0l