| Proposal ID | 086521 |
| Title | Shedding light on the X-ray weakness of the most luminous quasars |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0865210401 |
| DOI | https://doi.org/10.57780/esa-citsu3t |
| Principal Investigator, PI | Dr Luca Zappacosta |
| Abstract | In our WISE/SDSS-selected sample of hyperluminous (Lbol > 10^47 erg/s) quasars(WISSH) we are finding a sizable fraction of sources with strongly blueshiftedCIV emission lines (v_civ < -2000 km/s) and up to 1.5 dex lower X-ray luminosity(L_X) compared to that reported for normal quasars. Based on a sub-sample of 13sources, we find that L_X and v_civ significantly correlate. No relation isfound at other bands. Furthermore, at low L_X, our constraints on Gamma and N_Hare insufficient to verify a dependence on v_CIV. We propose for XMMobservations to perform a complete X-ray coverage for the remaining 9 WISSH QSOswith measured v_civ. These will allow a refined investigation enabling us todiscriminate between competing models for the origin of these sources. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2020-11-24T16:40:14Z/2021-01-07T19:22:33Z |
| Version | 18.02_20200221_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. |
| Creator Contact | https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk |
| Date Published | 2022-01-31T00:00:00Z |
| Last Update | 2026-03-04 |
| Keywords | "luminous quasars", "XMM", "xray weakness", "quasars wissh", "sub sample", "shedding light", "2000 km", "hyperluminous lbol", "normal quasars", "wissh qsos", "low l_x", "complete xray coverage", "sizable fraction", "SDSS", "refined investigation" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Luca Zappacosta, 2022, 'Shedding light on the X-ray weakness of the most luminous quasars', 18.02_20200221_1200, European Space Agency, https://doi.org/10.57780/esa-citsu3t |