Zobrazeno 1 - 10
of 33
pro vyhledávání: '"Michael R. S. Hawkins"'
Autor:
Michael R. S. Hawkins
This paper reviews the question of whether the wide separation double quasar Q2138-431 is a gravitational lens. From early work, the two quasar images are known to have almost identical spectra and redshifts, but no lensing galaxy has so far been det
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f140a387ec750ebd0f0deb739fb2d663
http://arxiv.org/abs/2104.02454
http://arxiv.org/abs/2104.02454
Autor:
Michael R. S. Hawkins
The aim of this paper is to provide a plausible explanation for the large amplitude microlensing events observed in the cluster lensed quasar system SDSS J1004+4112. The microlensed quasar images appear to lie well clear of the stellar population of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cc36540ba818e8df8e46f79a107e5f8d
http://arxiv.org/abs/2010.15007
http://arxiv.org/abs/2010.15007
Autor:
Michael R. S. Hawkins
The aim of this paper is to investigate the claim that stars in the lensing galaxy of a gravitationally lensed quasar system can always account for the observed microlensing of the individual quasar images. A small sample of gravitationally lensed qu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5c9264f65e1c44f65a41417e12376439
http://arxiv.org/abs/2001.07633
http://arxiv.org/abs/2001.07633
Autor:
Michael R. S. Hawkins
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 504:2390-2390
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d99e96154bde8c513ef83fac21f3f44b
https://doi.org/10.1093/mnras/stab1104
https://doi.org/10.1093/mnras/stab1104
Autor:
Michael R. S. Hawkins
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 415:2744-2757
The aim of this paper is to present the case that stellar mass primordial black holes make up the dark matter component of the Universe. A near critical density of compact bodies implies that most lines of sight will be gravitationally microlensed, a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2f484c9bfb1db84323b26443579a1a20
https://doi.org/10.1111/j.1365-2966.2011.18890.x
https://doi.org/10.1111/j.1365-2966.2011.18890.x
Publikováno v:
Journal of Cosmology and Astroparticle Physics. 2018:041-041
Making use of definitive new lattice computations of the Standard Model thermodynamics during the quantum chromodynamic (QCD) phase transition, we calculate the enhancement in the mass distribution of primordial black holes (PBHs) due to the softenin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1a62dd9a21d25fb77b0fb9198a3d70c8
https://doi.org/10.1088/1475-7516/2018/08/041
https://doi.org/10.1088/1475-7516/2018/08/041
Autor:
Michael R. S. Hawkins
The motivation for this paper is to review the limits set on the MACHO content of the Galactic halo by microlensing experiments in the direction of the Large Magellanic Cloud. This has been prompted by recent measurements of the Galactic rotation cur
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7eba67ec358d3293bdfcef6f26c0a58c
Autor:
Michael R. S. Hawkins
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 344:492-500
The study of quasar variability has long been seen as a way to understanding the structure of the central engine of active galactic nuclei, and as a means of verifying the morphology of the standard model. Much work has already been done on the stati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::556e04b7b49126d702889ea3c98558c9
https://doi.org/10.1046/j.1365-8711.2003.06828.x
https://doi.org/10.1046/j.1365-8711.2003.06828.x
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 330:378-382
Dark matter in the Universe consisting of macroscopic objects such as primordial black holes may cause gravitational lensing of distant objects. The magnification associated with lensing will lead to additional scatter in the received flux from stand
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::24cc226c548e42f559d375d0baaa86d5
https://doi.org/10.1046/j.1365-8711.2002.05061.x
https://doi.org/10.1046/j.1365-8711.2002.05061.x
Autor:
Michael R. S. Hawkins
Publikováno v:
International Astronomical Union Colloquium. 184:351-356
In this paper results from a monitoring programme of a large sample of quasars comprising regular yearly observations over a period of 23 years are presented. Structure functions of the light curves are calculated and compared with predictions for mo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f9f580038c064bfc52da0e2887600ef4
https://doi.org/10.1017/s0252921100031006
https://doi.org/10.1017/s0252921100031006