| Name | 069251 |
| 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=0692510101 |
| DOI | https://doi.org/10.5270/esa-2vdpxi9 |
| Author | European Space Agency |
| Description | The Sloan Digital Sky Survey has recently discovered a remarkable group of virgul80 quasars at z=2.2-5.9 with extremely weak emission lines in their rest-frame UV spectra. We propose to extend our XMM-Newton observations of such sources and obtain imaging spectroscopy of four quasars of this class with a total exposure time of 165 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 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 | 2012-06-22T21:35:30Z/2012-10-24T16:35:29Z |
| 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 | 2013-11-16T00:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 2013, Weak Line Quasars At High Redshift: Extremely High Accretion Rate Sources, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-2vdpxi9 |