A dataset provided by the European Space Agency

Name: THE HIGH-ENERGY CUT-OFF IN HIGH-Z QSOS: A FIRST CUT
Published: 2019-01-12T23:00:00Z

Proposal ID	079564
Title	THE HIGH-ENERGY CUT-OFF IN HIGH-Z QSOS: A FIRST CUT
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0795640101
DOI	https://doi.org/10.5270/esa-dc2hedv
Principal Investigator, PI	Dr Giorgio Lanzuisi
Abstract	We propose NuSTAR observations of two among the X-ray brightest (F 0.5-10 > 510^-13 ergs s^-1 cm^-2, L 2-10 > 10^45 ergs s^-1) radio-quiet QSOs at z > 1.8,complemented by a joint, short XMM-Newton exposure for one of them. Our totaltime request is 250ks with NuSTAR and 30ks with XMM-Newton. By looking atrest-frame energies up to ~ 200-300 keV, our goal is to measure unambiguouslythe presence of spectral cut-offs at rest-frame energies as high as E c=500 keV.This is not possible for targets in the local Universe, where NuSTAR is justsensitive to E c < 250 keV. Our sample is unique and will allow unprecedentedmeasurements of E c in distant AGN with such X-ray luminosities. Our programwill prove for the first time whether there is a physical limit to the temperature of AGN.
Publications	NuSTAR Measurement of Coronal Temperature in Two Luminous High-redshift Quasars \|Lanzuisi G. Gilli R. et al. \| ApJ \| 875-20 \| 2019 \| 2019ApJ...875L..20L \| http://ui.adsabs.harvard.edu/#abs/2019ApJ...875L..20L Classification of 4XMM-DR9 sources by machine learning \|Zhang Yanxia Zhao Yongheng \| MNRAS \| 503-5263 \| 2021 \| 2021MNRAS.503.5263Z \| http://ui.adsabs.harvard.edu/#abs/2021MNRAS.503.5263Z Exploring X-Ray Properties of Low-metallicity Dwarf Galaxies \|Cann Jenna M. Weaver Kimberly A. et al. \| ApJ \| 961-178 \| 2024 \| 2024ApJ...961..178C \| http://ui.adsabs.harvard.edu/#abs/2024ApJ...961..178C The XMM-Newton Line Emission Analysis Program (X-LEAP). I. Emission-line Survey of O VII O VIII and Fe L-shell Transitions \|Pan Zeyang Qu Zhijie et al. \| ApJS \| 271-62 \| 2024 \| 2024ApJS..271...62P \| http://ui.adsabs.harvard.edu/#abs/2024ApJS..271...62P
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2017-12-29T06:48:16Z/2017-12-29T17:21:36Z
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.
Creator Contact	https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk
Date Published	2019-01-12T23:00:00Z
Last Update	2025-01-27
Keywords	"physical limit", "XMM", "energy cut", "xray brightest", "xmm newton", "XMM-Newton", "spectral cut offs", "local universe", "rest frame energies", "z qsos", "NuSTAR", "xray luminosities", "total time", "radio quiet qsos", "distant agn"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Giorgio Lanzuisi, 2019, 'THE HIGH-ENERGY CUT-OFF IN HIGH-Z QSOS: A FIRST CUT', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-dc2hedv