|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'501'711
Articles rated: 2609
20 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
High-frequency radio properties of sources in the Fermi-LAT 1-year Point Source Catalogue | | Elizabeth K. Mahony
; Elaine M. Sadler
; Tara Murphy
; Ronald D. Ekers
; Philip G. Edwards
; Marcella Massardi
; | | Date: |
24 Mar 2010 | | Abstract: | The high-frequency radio sky, like the gamma-ray sky surveyed by the Fermi
satellite, is dominated by flat-spectrum radio quasars and BL-Lac objects at
bright flux levels. To investigate the relationship between radio and gamma-ray
emission in extragalactic sources, we have crossmatched the Australia Telescope
20 GHz survey catalogue (AT20G; Murphy et al. 2010) with the Fermi-LAT 1-year
Point Source Catalogue (1FGL; Abdo et al. 2010a). The 6.0 sr of sky covered by
both catalogues (delta<0 deg, |b|<1.5 deg) contains 5890 AT20G radio sources
and 604 1FGL gamma-ray sources. The AT20G source positions are accurate to
within ~1 arcsec and, after excluding known Galactic sources, 43% of Fermi 1FGL
sources have an AT20G source within the 95% Fermi confidence ellipse. Monte
Carlo tests imply that at least 95% of these matches are genuine associations.
Only five gamma-ray sources (1% of the Fermi catalogue) have more than one
AT20G counterpart in the Fermi error box. The AT20G matches also generally
support the AGN associations made by Abdo et al. (2010b).
We find a trend of increasing gamma-ray flux density with 20 GHz radio flux
density. The Fermi detection rate of AT20G sources is close to 100% for the
brightest 20 GHz sources, decreasing to 20% at 1 Jy and roughly 1% at 100 mJy.
Eight of the matched AT20G sources have no association listed in 1FGL and are
presented here as potential gamma-ray AGN for the first time. We also identify
an alternative AGN counterpart to one 1FGL source. The percentage of Fermi
sources with AT20G detections decreases towards the Galactic plane, suggesting
that the 1FGL catalogue contains at least 50 Galactic gamma-ray sources in the
southern hemisphere that have yet to be identified. | | Source: | arXiv, 1003.4580 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER