Is 4C+29.48 a gamma-ray source?
  The Fermi Large Area Telescope revealed that the extragalactic gamma-ray sky
is dominated by blazars, active galactic nuclei (AGN) whose jet is seen at very
small angle to the line of sight. To associate and then classify the gamma-ray
sources, data have been collected from lower frequency surveys and
observations. The gamma-ray source 3FGL J1323.0+2942 is associated with the
radio source 4C+29.48 and classified as a blazar of unknown type, lacking
optical spectrum and redshift. The higher-resolution radio data showed that
4C+29.48 comprises three bright radio-emitting features located within a
~1'-diameter area. We (re-)analyzed archival Very Large Array and unpublished
very long baseline interferometry (VLBI) observations conducted by the Very
Long Baseline Array and the European VLBI Network of 4C+29.48. We also
collected data form optical, infrared and X-ray surveys. The northernmost
complex of 4C+29.48 contains a blazar with a high brightness temperature
compact core and a steep-spectrum jet feature. The blazar is positionally
coincident with an optical source at a redshift of 1.142. Its mid-infrared
colors also support its association with a gamma-ray emitting blazar. The two
other radio complexes have steep radio spectra and do not have optical or
infrared counterparts in currently available surveys. Based on the radio
morphology, they are unlikely to be related to the blazar. We discuss the
possibilities whether the two radio features are lobes of a radio galaxy, or
gravitationally lensed images of a background source. We propose to associate
3FGL J1323.0+2942 in subsequent versions of the Fermi catalog with the blazar
residing in northernmost complex. We suggest naming this source J1323+2941A to
avoid misinterpretation arising from the fact that the coordinates of the
currently listed radio counterpart 4C+29.48 is closer to a most probably
unrelated radio source. (abridged)
