The Compact Symmetric Radio Structure of the Peculiar Gamma-Ray Source PMN J1603-4904
Abstract
The Southern Hemisphere AGN monitoring program TANAMI, provides regular VLBI monitoring and multiwavelength coverage of extragalactic jets south of -30° declination. We focus on our latest results on the bright hard-spectrum gamma-ray source PMN J1603-4904. Our VLBI observations reveal a symmetric brightness distribution with the brightest, most compact component at the center of the emission region. Its broadband spectral energy distribution and other multiwavelength properties point to either a very atypical blazar or can be explained as a young radio galaxy with possible starburst contribution. The latter would make PMN J1603-4904 the first young radio galaxy detected in gamma-rays, so additional confirmation is sought. Our recent Suzaku and XMM observations detect a narrow iron line, which allows us a first measurement of the redshift of the system (z∼0.179) and to constrain the linear extent of the arcsec-scale structure to be smaller than ∼3kpc, which in the two-sided jet scenario is in agreement with the small linear scales known from young radio galaxies.
- Publication:
-
The X-ray Universe 2014
- Pub Date:
- July 2014
- Bibcode:
- 2014xru..confE.148M