Polarimetric Monitoring of AGN at Millimeter Wavelengths

Description of the POLAMI program

POLAMI is a long-term program to monitor the polarimetric properties (Stokes I, Q, U, and V) of a sample of around 40 bright active galactic nuclei (AGN) at 3.5 and 1.3 millimeter wavelengths with the IRAM 30m Telescope near Granada, Spain. The program has been kept running since October 2006 and it currently time samples with a goal cadence of ~2 weeks. The XPOL polarimetric observing setup has been routinely used as described in Thum et al. (2008) since the start of the program.

Data obtained by the POLAMI collaboration are combined with other IRAM 30m projects approved by the IRAM program committee as well as other survey and target-of-opportunity projects, and the results are presented here. Therefore, the POLAMI database includes measurements of over 200 AGN. Most of these sources were observed in the single-epoch surveys published in Agudo et al. (2010; 2014). 

First series of POLAMI papers

A series of 3 papers have just been published in MNRAS. In the first paper of this series (POLAMI Paper I) we present the results of the first 8 years of POLAMI observations, we provide detailed information about the observing program, the most intensively monitored source sample of ~40 sources, the data reduction and calibration, and we demonstrate the quality of our data by showing the results obtained for the main calibrators. The data obtained from the science targets, as well as the analysis and astrophysical implications of their circular polarisation properties and of their total flux and linear polarisation variability are shown in POLAMI Paper II, and Paper III, respectively. Detailed studies of specific sources and discussions of statistical aspects of our sample, like correlations with optical, gamma-ray, and millimetre VLBI data will be presented in separate publications, currently in preparation.