X-ray observations of low-power FR I radio galaxies

Details X-ray observations of low-power FR I radio galaxies X-ray observations of low-power FR I radio galaxies

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...348..437t&link_type=abstract

Astronomy and Astrophysics, v.348, p.437-445 (1999)

Astronomy and Astrophysics

Astrophysics

18

Galaxies: Active, Galaxies: Individual: 3C 78, Oh-342, Pk0620-52, Galaxies: Nuclei

Scientific paper

According to unified schemes for Active Galactic Nuclei, low-power, Fanaroff-Riley type I (FR I), radio galaxies are thought to be BL Lacs with their jets pointing at relatively large angles with respect to the line of sight. X-ray observations of FR I sources can test this scenario and constrain the presence of obscuring material around the nucleus. In this paper we discuss the X-ray properties of three FR I radio galaxies 3C 78, OH-342 and PKS 0620-52, observed with the BeppoSAX satellite in the 0.2-10 keV energy range. The narrow-field instruments on board BeppoSAX have detected extended thermal X-ray emission from a hot galactic corona (3C 78) and intracluster gas (OH-342 and PKS 0620-52). However, a detailed spectral analysis suggests that a non-thermal (likely nuclear) component can also significantly contribute to the total flux, especially in the case of 3C 78 and OH-342. This emission from the central region appears basically unabsorbed, in agreement with observations in other bands. The X-ray spectral luminosity of the nucleus of these three objects is correlated with the radio core luminosity, consistently with previous data on other FR I radio galaxies.

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