A Multiwavelength Study of the Extreme AGN J2310-437

Abstract

We present new X-ray, radio, and optical data for the unusual galaxy/cluster system J2310-437. Our results confirm the presence of an active nucleus, and suggest an interpretation as an anomalous BL Lac object of bulk relativistic Doppler factor < 2, with an optically deficient radio-to-X-ray spectrum. The radio, optical, and soft X-ray flux densities could lie along a single power-law function, lacking the curvature typical of BL Lac objects. Compared with other known sources that may have comparable multifrequency spectra, J2310-437 is the most extreme. Its low isotropic optical/UV radiation is consistent with the intensity of external photons governing the electron spectral break through Compton cooling; in this source the external photon density would be too low to produce a spectral break below the X-ray.

arXiv comment19 pages, including 10 figures, using emulateapj.sty and apjfonts.sty. To appear in the ApJ

References in corpus (4)

• Radio-loud Active Galaxies in the Northern ROSAT All-Sky Survey III: New Spectroscopic Identifications from the RGB BL Lac Survey
• Dynamics of the radio galaxy 3C449
• E 0336-248 : A New BL Lac Object Found by an Old Einstein
• Optical Spectroscopy of the unusual galaxy J2310-43

Cited by in corpus (9)

• The Extended Chandra Deep Field-South Survey: Optical spectroscopy of faint X-ray sources with the VLT and Keck
• XMM-Newton observations expose AGN in apparently normal galaxies
• Spectroscopic identification of ten faint hard X-ray sources discovered by Chandra
• X-ray observations of low-power radio galaxies from the B2 catalogue
• A Multiwavelength Spectral and Polarimetric Study of the Jet of 3C 264
• Separating the BL Lac and Cluster X-ray Emissions in Abell 689 with Chandra
• The Knotty Question of the Jet of PKS B1421-490
• The Gaseous Environments of Radio Galaxies
• Unmasking the Active Galactic Nucleus in PKS J2310-437