Cross‐Correlation Spectropolarimetry in Single‐Dish Radio Astronomy

Crosscorrelation Spectropolarimetry in Single-dish Radio Astronomy

Modern digital correlators permit the simultaneous measurement of all four Stokes parameters using auto and crosscorrelation. We briefly outline the fundamental requirements and some practical details of performing such measurements and refer to two additional papers that provide overview and cover calibration issues in detail. Subject headings: polarization — instrumentation: polarimeters — te...

Radio Frequency Interference Mitigation in Radio Astronomy

Uv Spectropolarimetry of Narrow-line Radio Galaxies

We present the results of UV spectropolarimetry (λrest ≃ 2000 − 3000Å) and far-UV spectroscopy (λrest ≃ 1500 − 2000Å) of two low-redshift narrow-line radio galaxies (NLRGs) taken with the Faint Object Spectrograph onboard the Hubble Space Telescope (HST). Spectropolarimetry of several NLRGs has shown that, by the presence of broad permitted lines in polarized flux spectrum, they have hidden qua...

Radio Astronomy with RASDR2

The RASDR design team is releasing a software-defined receiver (SDR) for radio astronomy called RASDR2 7 . The receiver consists of two high-density circuit boards -a wide-band femtocell 8 chip on the front end analog interface MyriadRF board 9 linked to a DigiRed digitization and function control board -coupled to a computer via either a USB2 or USB3 interface. RASDRViewer software runs in a W...

National Radio Astronomy Observatory

Measurements of microwave attenuation at room temperature and 4.2 K have been performed on some conductors commonly used in receiver input circuits. The reduction in loss on cooling is substantial, particularly for copper and plated gold, both of which showed a factor of 3 loss reduction. Copper passivated with benzotriazole shows the same loss as without passivation. The residual resistivity r...