gary
30-01-2019, 11:04 AM
Using data from the European Space Agency's X-ray space observatory,
XMM-Newton, researchers led by Guido Risaliti of Università di Firenze,
Italy, and Elisabeta Lusso of Durham University, UK, have pegged the
distances to thousands of distant quasars, thus enabling them to be used
as 'standard candles'.
ESA press release here :-
http://sci.esa.int/xmm-newton/61068-active-galaxies-point-to-new-physics-of-cosmic-expansion/
"Cosmological constraints from the Hubble diagram of quasars at high redshifts" by G. Risaliti & E. Lusso in Nature Astronomy (subscription required) :-
https://www.nature.com/articles/s41550-018-0657-z
XMM-Newton, researchers led by Guido Risaliti of Università di Firenze,
Italy, and Elisabeta Lusso of Durham University, UK, have pegged the
distances to thousands of distant quasars, thus enabling them to be used
as 'standard candles'.
ESA press release here :-
http://sci.esa.int/xmm-newton/61068-active-galaxies-point-to-new-physics-of-cosmic-expansion/
"Cosmological constraints from the Hubble diagram of quasars at high redshifts" by G. Risaliti & E. Lusso in Nature Astronomy (subscription required) :-
https://www.nature.com/articles/s41550-018-0657-z