XMM-Newton Large Programme Details



PROPOSAL OVERVIEW
Proposal Title High-redshift quasars: Cosmology and Physics
Proposal Category Active Galactic Nuclei, Quasars, BL-Lac Objects and Tidal Disruption Events
Proposal Type LARGE PROGRAM
Proposal Id 084497
Number of Observations 19
Total exposure time (ks) 1377

PI DETAILS
PI Dr Elisabeta Lusso
Institute Durham University
Country UNITED KINGDOM

CO-INVESTIGATORS
Name Country
G. Risaliti ITALY
E. Nardini ITALY
M. Elvis UNITED STATES
C. Vignali ITALY
R. Gilli ITALY
S. Bisogni ITALY
F. Salvestrini ITALY

ABSTRACT
The non-linear X-ray/UV relation in quasars can be used to build a Hubble diagram and test cosmological models at high redshift. To this aim, we were awarded an XMM LP to observe 30 bright quasars at z~3. We found a tighter-than- expected X-ray/UV relation, implying that pointed observations can greatly reduce the uncertainties in the determination of quasar distances, and a new population of X-ray weak quasars that represents ~30% of the z~3 sample. We propose an extensive survey of bright, radio-quiet, SDSS quasars at z~4 with the goals of (1) detecting a 4sigma deviation from the LambdaCDM model using this z~4 sample alone, (2) measuring the X-ray weak fraction of quasars for the first time at z~4 and its evolution with time.

PAPERS
Authors marked in red are (co-)investigators in the proposal

Classification of papers are:
- CLASS 1:   papers that present specific XMM-Newton observations
- CLASS 2: papers that refer to published XMM-Newton results with complementary observations, follow-up analysis, or theoretical analysis
- CLASS 3: further deliveries which resulted from the program and which are made available to the community (e.g. source catalogues, processed images or spectra in public data base)
- CLASS 4: comments and suggestions from PI


There are no papers associated to this proposal