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K. Helgason

19 papers hereh-index 14488 citations26 works total

Matching runs newest-first, so older work may not be attached to this profile yet.

author position
  • first author6
  • middle author7
  • last author3

Across the 16 of 19 papers where every author was matched, so the position is known.

fields
  • astro-ph.CO15
  • astro-ph.GA2
  • astro-ph.HE2

identity via Semantic Scholar / OpenAlex

activity
20122019
most citedA new measurement of the Hubble constant and matter content of the Universe using extragalactic background light γ-ray attenuation

90 citations · 577 across the 19 of their papers we have counts for

collaborators
Showing 2012Show all

3 papers · 1 filter

astro-ph.CO2012★ 53 cited

Reconstructing the γ-ray Photon Optical Depth of the Universe to z~4 from Multiwavelength Galaxy Survey Data

Kari Helgason, Alexander Kashlinsky

We reconstruct γ-ray opacity of the Universe out to z<3-4 using an extensive library of 342 observed galaxy luminosity function surveys extending to high redshifts. We cover the wh…

astro-ph.CO2012

Can the Near-IR Fluctuations Arise from Known Galaxy Populations?

Kari Helgason, Massimo Ricotti, Alexander Kashlinsky

Spatial Fluctuations in the Cosmic Infrared Background have now been measured out to sub-degree scales showing a strong clustering signal from unresolved sources. We attempt to exp…

astro-ph.CO2012★ 85 cited

Reconstructing the Near-IR Background Fluctuations from known Galaxy Populations using Multiband Measurements of Luminosity Functions

Kari Helgason, Massimo Ricotti, Alexander Kashlinsky

We model fluctuations in the Cosmic Infrared Background (CIB) arising from known galaxy populations using 233 measured UV, optical and NIR luminosity functions (LF) from a variety…

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Not affiliated with arXiv. Researcher data from Semantic Scholar (ODC-BY) and OpenAlex.