Dr Siddharth Maharana: Publications

WALOP-South: A wide-field one-shot linear optical polarimeter for PASIPHAE survey

ArXiv 2102.09519 (2021)

Authors:

Siddharth Maharana, John A Kypriotakis, AN Ramaprakash, Pravin Khodade, Chaitanya Rajarshi, Bhushan S Joshi, Pravin Chordia, Ramya M Anche, Shrish Mishra, Dmitry Blinov, Hans Kristian Eriksen, Tuhin Ghosh, Eirik Gjerløw, Nikolaos Mandarakas, Georgia V Panopoulou, Vasiliki Pavlidou, Timothy J Pearson, Vincent Pelgrims, Stephen B Potter, Anthony CS Readhead, Raphail Skalidis, Konstantinos Tassis, Ingunn K Wehus

RoboPol: AGN polarimetric monitoring data

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 501:3 (2021) 3715-3726

Authors:

D Blinov, S Kiehlmann, V Pavlidou, GV Panopoulou, R Skalidis, E Angelakis, C Casadio, EN Einoder, T Hovatta, K Kokolakis, A Kougentakis, A Kus, N Kylafis, E Kyritsis, A Lalakos, I Liodakis, S Maharana, E Makrydopoulou, N Mandarakas, GM Maragkakis, I Myserlis, I Papadakis, G Paterakis, TJ Pearson, AN Ramaprakash, ACS Readhead, P Reig, A Słowikowska, K Tassis, K Xexakis, M Żejmo, JA Zensus

Abstract:

ABSTRACT We present uniformly reprocessed and re-calibrated data from the RoboPol programme of optopolarimetric monitoring of active galactic nuclei (AGNs), covering observations between 2013, when the instrument was commissioned, and 2017. In total, the data set presented in this paper includes 5068 observations of 222 AGN with Dec. > −25○. We describe the current version of the RoboPol pipeline that was used to process and calibrate the entire data set, and we make the data publicly available for use by the astronomical community. Average quantities summarizing optopolarimetric behaviour (average degree of polarization, polarization variability index) are also provided for each source we have observed and for the time interval we have followed it.

WALOP-South: A wide-field one-shot linear optical polarimeter for PASIPHAE survey

Ground-based and Airborne Instrumentation for Astronomy VIII SPIE (2020) 24-24

Authors:

Siddharth Maharana, John A Kypriotakis, Anamparambu N Ramaprakash, Pravin Khodade, Chaitanya V Rajarshi, Bhushan S Joshi, Pravin A Chordia, Ramya Anche, Shrish Mishra, Dmitry Blinov, Hans Kristian Eriksen, Tuhin Ghosh, Eirik Gjerløw, Nikolaos Mandarakas, Georgia V Panopoulou, Vasiliki Pavlidou, Timothy J Pearson, Vincent Pelgrims, Stephen Potter, Anthony CS Readhead, Raphail Skalidis, Konstantinos Tassis, Ingunn K Wehus

RoboPol: AGN polarimetric monitoring data

ArXiv 2012.00008 (2020)

Authors:

RoboPol: a four-channel optical imaging polarimeter

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 485:2 (2019) 2355-2366

Authors:

AN Ramaprakash, CV Rajarshi, HK Das, P Khodade, D Modi, G Panopoulou, S Maharana, D Blinov, E Angelakis, C Casadio, L Fuhrmann, T Hovatta, S Kiehlmann, OG King, N Kylafis, A Kougentakis, A Kus, A Mahabal, A Marecki, I Myserlis, G Paterakis, E Paleologou, I Liodakis, I Papadakis, I Papamastorakis, V Pavlidou, E Pazderski, TJ Pearson, ACS Readhead, P Reig, A Słowikowska, K Tassis, JA Zensus

Abstract:

ABSTRACT We present the design and performance of RoboPol, a four-channel optical polarimeter operating at the Skinakas Observatory in Crete, Greece. RoboPol is capable of measuring both relative linear Stokes parameters q and u (and the total intensity I) in one sky exposure. Though primarily used to measure the polarization of point sources in the R band, the instrument features additional filters (B, V, and I), enabling multiwavelength imaging polarimetry over a large field of view (13.6′ × 13.6′). We demonstrate the accuracy and stability of the instrument throughout its 5 yr of operation. Best performance is achieved within the central region of the field of view and in the R band. For such measurements the systematic uncertainty is below 0.1 per cent in fractional linear polarization, p (0.05 per cent maximum likelihood). Throughout all observing seasons the instrumental polarization varies within 0.1 per cent in p and within ∼1° in polarization angle.

51��