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
Quasars at All Cosmic Epochs [PDF]
, 2018 The last 50 years have seen a tremendous progress in the research on quasars. From a time when quasars were unforeseen oddities, we have come to a view that considers quasars as active galactic nuclei, with nuclear activity a coming-of-age experienced by
Ascensión del Olmo +7 more
core +1 more source
General multipoles and their implications for dark matter inference [PDF]
Monthly notices of the Royal Astronomical SocietyThe flux ratios of strongly lensed quasars have previously been used to infer the properties of dark matter. In these analyses it is crucial to separate the effect of the main lensing galaxy and the low-mass dark matter halo population.
J. Cohen +3 more
semanticscholar +1 more source
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
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
General Physical Properties of Gamma-Ray-emitting Narrow-line Seyfert 1 Galaxies [PDF]
Astrophysical Journal, 2019 We present the results of a detailed multiwavelength study of a sample of 16 narrow-line Seyfert 1 (NLSy1) galaxies known in γ-rays so far. This includes a focused X-ray spectral analysis, to compare them with a more general NLSy1 population, and a ...
V. Paliya +6 more
semanticscholar +1 more source
Probing the Environment of High-z Quasars Using the Proximity Effect in Projected Quasar Pairs [PDF]
Astrophysical Journal, 2018 We have used spectra of 181 projected quasar pairs at separations ≤1.5′ from the Sloan Digital Sky Survey Data Release 12 in the redshift range of 2.5–3.5 to probe the proximity regions of the foreground quasars. We study the proximity effect both in the
P. Jalan, H. Chand, R. Srianand
semanticscholar +1 more source
Modelling accretion disk winds in quasars
, 2014 Outflows are ubiquitous in active galactic nuclei (AGN). They can take the form of either dramatic radio jets, which extend vast distances into the inter-galactic medium, or of much smaller scale winds - whose existence can be inferred only indirectly ...
Nick Higginbottom +1 more
core +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