New Upper Limits on Intergalactic Infrared Radiation from High-Energy Astrophysics

Details New Upper Limits on Intergalactic Infrared Radiation from High-Energy Astrophysics New Upper Limits on Intergalactic Infrared Radiation from High-Energy Astrophysics

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...415l..71s&link_type=abstract

Astrophysical Journal Letters v.415, p.L71

Astronomy and Astrophysics

Astronomy

79

Galaxies: Quasars: General, Galaxies: Quasars: Individual Name: Markarian 421, Gamma Rays: Theory, Infrared: General

Scientific paper

Following our previously proposed technique, we have used the recent γ-ray observations of Mrk 421 obtained by the Whipple Observatory team and the EGRET experiment on Compton Gamma-Ray Observatory as a probe to place significant constraints on the intergalactic infrared energy density. Our 2 σ upper limits are ~10^-8^ W m^-2^ sr^-1^ for the 1-5 micron range. These constraints are much better than those obtained by direct measurements. They rule out more exotic mechanisms for producing a large intergalactic IR flux and are consistent with radiation produced by stars in normal galaxies.

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