dc.contributor.author | Dijkstra, Mark | |
dc.contributor.author | Loeb, Abraham | |
dc.date.accessioned | 2019-09-26T15:01:29Z | |
dc.date.issued | 2009 | |
dc.identifier.citation | Dijkstra, Mark, and Abraham Loeb. 2009. “Upper Limit on Dimming of Cosmological Sources by Intergalactic Grey Dust from the Soft X-Ray Background.” Monthly Notices of the Royal Astronomical Society 397 (4): 1976–81. https://doi.org/10.1111/j.1365-2966.2009.15102.x. | |
dc.identifier.issn | 0035-8711 | |
dc.identifier.issn | 1365-2966 | |
dc.identifier.uri | http://nrs.harvard.edu/urn-3:HUL.InstRepos:41412190 | * |
dc.description.abstract | Active galactic nuclei (AGN) produce a dominant fraction (F(AGN) similar to 80 per cent) of the soft X-ray background (SXB) at photon energies 0.5 < E < 2 keV. If dust pervaded throughout the intergalactic medium, its scattering opacity would have produced diffuse X-ray haloes around AGN. Taking account of known galaxies and galaxy clusters, only a fraction F(halo) less than or similar to 10 per cent of the SXB can be in the form of diffuse X-ray haloes around AGN. We therefore limit the intergalactic opacity to optical/infrared photons from large dust grains, with radii in the range a = 0.2-2.0 mu m, to a level tau(GD) less than or similar to 0.15(F(halo)/10 per cent)(F(AGN)/80 per cent)(-1) to a redshift z similar to 1. Our results are only weakly dependent on the grain size distribution in this size range or the redshift evolution of the intergalactic dust. Stacking X-ray images of AGN can be used to improve our constraints and diminish the importance of dust as a source of systematic uncertainty for future supernova surveys which aim to improve the precision on measuring the redshift evolution of the dark energy equation-of-state. | |
dc.language.iso | en_US | |
dc.publisher | Oxford University Press | |
dash.license | LAA | |
dc.title | Upper limit on dimming of cosmological sources by intergalactic grey dust from the soft X-ray background | |
dc.type | Journal Article | |
dc.description.version | Version of Record | |
dc.relation.journal | Monthly Notices of the Royal Astronomical Society | |
dash.depositing.author | Loeb, Abraham::e022a3952362350ac8a0138f128a8be7::600 | |
dc.date.available | 2019-09-26T15:01:29Z | |
dash.workflow.comments | 1Science Serial ID 66367 | |
dc.identifier.doi | 10.1111/j.1365-2966.2009.15102.x | |
dash.source.volume | 397;4 | |
dash.source.page | 1976-1981 | |