Outflow-related radio emission in radio-quiet quasars [PDF]
Monthly notices of the Royal Astronomical SocietyIn this work, we revisit the relationship between [O III] line width w90 (as the indicator of AGN outflow velocity) and the radio emission in RQQs by employing a large sample of Type I quasars (∼37, 000) selected from the Sloan Digital Sky Survey (SDSS)
Mai Liao +3 more
semanticscholar +1 more source
Decoding signatures of extra dimensions and estimating spin of quasars from the continuum spectrum [PDF]
Physical Review D, 2019 Continuum spectrum emitted by the accretion disk around quasars hold a wealth of information regarding the strong gravitational field produced by the massive central object.
Indrani Banerjee +2 more
semanticscholar +1 more source
An ALMA CO(2–1) Survey of Nearby Palomar–Green Quasars [PDF]
Astrophysical Journal Supplement Series, 2019 The properties of the molecular gas can shed light on the physical conditions of quasar host galaxies and the effect of feedback from accreting supermassive black holes.
J. Shangguan +4 more
semanticscholar +1 more source
Jet efficiencies and black hole spins in jetted quasars [PDF]
, 2020 The mechanisms responsible for the production of relativistic jets from supermassive black holes (SMBHs) accreting at near-Eddington rates are not well-understood.
Gustavo Soares, R. Nemmen
semanticscholar +1 more source
, 2020 In this work, we obtain measurements of the Hubble constant in the context of modified gravity theories. We set up our theoretical framework by considering viable cosmological $f(R)$ and $f(T)$ models, and we analyzed them through the use of geometrical ...
R. D’Agostino, Rafael C. Nunes
semanticscholar +1 more source
Observational properties of a general relativistic instability supernova from a primordial supermassive star [PDF]
, 2021 We present the expected observational properties of a general relativistic instability supernova (GRSN) from the 55,500 M⊙ primordial (Population III) star. Supermassive stars exceeding 104 M⊙ may exist in the early Universe.
T. Moriya +4 more
semanticscholar +1 more source
Current constraints on deviations from General Relativity using binning in redshift and scale [PDF]
Journal of Cosmology and Astroparticle Physics, 2020 We constrain deviations from general relativity (GR) including both redshift and scale dependencies in the modified gravity (MG) parameters. In particular, we employ the under-used binning approach and compare the results to functional forms.
C. Garcia-Quintero, M. Ishak, O. Ning
semanticscholar +1 more source
Detecting quasars at very high redshift with next generation X-ray telescopes [PDF]
Monthly Notices of the Royal Astronomical Society, 2008 18 pages, 11 Figures. Version accepted to MNRAS; extra data plotted, XEUS and Con-X sensitivities corrected and predictions amended ...
Rhook, Kirsty J., Haehnelt, Martin G.
openaire +2 more sources
THE NEXT GENERATION ATLAS OF QUASAR SPECTRAL ENERGY DISTRIBUTIONS FROM RADIO TO X-RAYS [PDF]
The Astrophysical Journal Supplement Series, 2011 We have produced the next generation of quasar spectral energy distributions (SEDs), essentially updating the work of Elvis et al. (1994) by using high-quality data obtained with several space and ground-based telescopes, including NASA's Great Observatories.
Shang, Zhaohui +16 more
openaire +3 more sources
Weak13CO in the Cloverleaf quasar: evidence for a young, early generation starburst [PDF]
Astronomy and Astrophysics, 2010 7 pages, 5 figures, accepted for publication in A&A (Main Journal)
Henkel, C. +4 more
openaire +3 more sources