A dataset provided by the European Space Agency

Name 074335
Title Weak Line Quasars at High Redshift: Extremely High Accretion Rate Sources?
URL

https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0743350501

DOI https://doi.org/10.5270/esa-8avt4we
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 six quasars of this class with a total exposure time of 128 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 lead to new 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 2014-08-08T19:35:14Z/2014-08-09T06:25:14Z
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 2015-08-25T22:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2015-08-25T22:00:00Z, 074335, 17.56_20190403_1200. https://doi.org/10.5270/esa-8avt4we