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NIR/Optical Counterparts of Hotspots in Radio Galaxies
K. -H. Mack, M. A. Prieto, G. Brunetti +1
We present new high spatial resolution VLT and VLA observations of a sample of nine low-power (P_{1.4 GHz} < 10^{25} W/Hz) radio hotspots. Infrared/optical emission is definitely d…
Are young radio sources in equipartition?
M. Orienti, D. Dallacasa
The knowledge of physical conditions in young radio sources is important for defining the framework of models describing radio source evolution. We investigate whether young radio…
Constraining the nature of High Frequency Peakers. II. Polarization properties
M. Orienti, D. Dallacasa
Aims: The ``bright'' High Frequency Peakers (HFPs) sample is a mixture of blazars and intrinsically small and young radio sources. We investigate the polarimetric characteristics o…
Radio spectrum evolution and magnetic field in extreme GPS radio sources. The case of RXJ1459+3337
M. Orienti, D. Dallacasa
Aims: The knowledge of the properties of the youngest radio sources is very important in order to trace the earliest phase of the evolution of the radio emission. RXJ1459+3337, wit…
Constraining the nature of High Frequency Peakers. I. The spectral variability
M. Orienti, D. Dallacasa, C. Stanghellini
We investigate the spectral characteristics of 51 candidate High Frequency Peakers (HFPs), from the ``bright'' HFP sample, in order to determine the nature of each object, and to o…
Constraining the spectral age of very asymmetric CSOs
M. Orienti, D. Dallacasa, C. Stanghellini
We constrain the spectral ages for two very asymmetric Compact Symmetric Objects (CSO) from the B3-VLA-CSS sample, and we investigate the role of the ambient medium potentially abl…
HI Absorption in High-Frequency Peaker Galaxies
M. Orienti, R. Morganti, D. Dallacasa
WSRT observations have been used to investigate the presence of neutral hydrogen in extremely young radio galaxies. These objects were selected from a sample of High-Frequency Peak…
VLBA images of High Frequency Peakers
M. Orienti, D. Dallacasa, S. Tinti +1
We propose a morphological classification based on the parsec scale structure of fifty-one High Frequency Peakers (HFPs) from the ``bright'' HFP sample. VLBA images at two adjacent…
Spitzer 24 micron imaging of Faint Radio Sources in the FLSv: a new radio-loud, Mid-IR/optically obscured population?
M. Orienti, M. A. Garrett, C. Reynolds +1
Data from the Spitzer Space Telescope (the First Look Survey - FLS) have recently been made public. We have compared the 24 micron images with very deep WSRT 1.4 GHz observations (…