Search for gamma-ray emission from star-forming galaxies with Fermi LAT

TL;DR

This study uses seven years of Fermi LAT data to search for gamma-ray emission from star-forming galaxies, finding no new detections but refining the understanding of their gamma-ray emission efficiency.

Contribution

It provides updated upper limits on gamma-ray fluxes from star-forming galaxies, confirming and refining the gamma-ray luminosity and infrared luminosity correlation.

Findings

No new gamma-ray detections from the sample galaxies.

Upper limits support the existing gamma-ray and infrared luminosity correlation.

Some galaxies are less efficient gamma-ray emitters than previously estimated.

Abstract

Recent studies have found a positive correlation between the star-formation rate of galaxies and their gamma-ray luminosity. Galaxies with a high star-formation rate are expected to produce a large amount of high-energy cosmic rays, which emit gamma-rays when interacting with the interstellar medium and radiation fields. We search for gamma-ray emission from a sample of galaxies within and beyond the Local Group with data from the LAT instrument onboard the Fermi satellite. We exclude recently detected galaxies (NGC 253, M82, NGC 4945, NGC 1068, NGC 2146, Arp 220) and use seven years of cumulative Pass 8 data from the LAT in the 100 MeV to 100 GeV range. No new detections are seen in the data and upper limits for the gamma- ray fluxes are calculated. The correlation between gamma-ray luminosity and infrared luminosity for galaxies obtained using our new upper limits is in agreement with a previously published correlation, but the new upper limits imply that some galaxies are not as efficient gamma-ray emitters as previously thought.