ILT-TO @ Amsterdam 07.04.2017
IISM studies with the German stations of LOFAR
Caterina Tiburzi MPIfR @ Bonn – University of Bielefeld
J. Verbiest, S. Osłowski, A. Horneffer, J. Künsem ӧ ller, N. Porayko, A. Noutsos, L. Kuenkel, H. Jung, J. Donner, O. Wucknitz LOFAR
● “Superterp”, Exloo (the Netherlands) 24 stations – 48 HBA tiles/96 LBAs
● “Remote”, the Netherlands 14 stations – 48 HBA tiles/96 LBAs
● “International”, Germany, Poland, France, Sweden, UK(, Ireland) 12 stations, – 96 HBA tiles/96 LBAs
Credits: van Haarlem et al. 2013/ASTRON SE607 The GLOWing stations Onsala
DE609 Norderstedt
DE604 DE605 Bornim Jülich DE603 Tautenburg DE601 Effelsberg DE602 Unterweilenbach
6 stand alone Credits: www.astron.nl www.glowconsortium.de telescopes! Pulsar monitoring
● Weekly observations with HBA antennas across 6 German stations
● ~110 pulsars every week
● ~20 MSPs
● Continuously checking additional pulsars for detections
● 10 new detections + 5 marginal detections (non-regularly observed)
● ~60 non-detections so far
Computing resources
● Recording machines:
● 10 @ MPIfR
● GLOW cluster @ Jülich Supercomputing Centre
● Raw data are streamed to the recording machines and folded on the spot
● Folded data copied to spinning disks in the GLOW cluster (soon to a server in Bielefeld) and in a server at the MPIfR
● The Bonn data are archived on tapes
● Soon, the data archived in Bielefeld will be pre-processed to reduce the data volume
Superterp vs. German stations
Superterp German stations 48 HBAs per station 96 HBAs per station 24 phased-up stations 6 independent stations
● Effective area differs by approximatively a factor of 12 ● GLOW observes weekly, thanks to owner's time
The German stations are complementary to the Core, providing less sensitive observations, but with higher cadence
Core vs. German stations
Credits: Joris Verbiest, Bielefeld University Pulsar and interstellar medium
Pulsars are probes of the ionized part of the interstellar medium
DM Δ ∝ t 2 f Effects such as dispersion, us DM= n dl ∫pulsar e scattering, scintillation, Faraday n tro rotation, have an inverse lec t E ten dependence on observing on C frequency f
HIGH PRECISIONS AT LOW phase FREQUENCIES
Credits: http://astronomy.swin.edu.au/ Structure and turbulence of the IISM
Credits: Julian Donner, Bielefeld University Long-term variability of the IISM
PSRs J0700+6418, J1509+5531
Credits: Julian Donner, Bielefeld University Intra-day variability of the IISM
PSR J1509+5531
Credits: Julian Donner, Bielefeld University The smoking gun of an ESE?
PSR J1509+5531
Credits: Stefan Osłowski, Swinburne University The smoking gun of an ESE?
PSR J1509+5531
Credits: Stefan Osłowski, Swinburne University The smoking gun of an ESE?
PSR J1509+5531
Credits: Olaf Wucnitz, MPIfR The smoking gun of an ESE?
PSR J1509+5531
Credits: Olaf Wucnitz, MPIfR Scintillation parameters
PSR J0814+7429
Credits: Hauke Jung, Bielefeld University Scintillation parameters
PSR J0814+7429
Credits: Lars Künkel, Bielefeld University Scintillation parameters
PSR J0814+7429
Credits: Lars Künkel, Bielefeld University Scintillation arcs
PSR J1136+1551
Credits: Stefan Osłowski, Swinburne University Probing the Heliosphere
PSR J0034-0534
Credits: Aaron von Kamen, Bielefeld University Ionospheric correction
PSRs J0332+5434, J0332+5434, J1136+1551
Credits: Nataliya Porayko, MPIfR Ionospheric correction
EHRG CODG
Lorenzian Spectrum
ESAG UQRG
A2 S(f )= 2 f 0 (1+(f /f 0) )
10-9 10-8 10-7 10-6 10-5 10-4 10-3 10-2 10-1 100 101 102
Credits: Nataliya Porayko, MPIfR Summary
● Weekly pulsar monitoring ongoing with 6 German stations and the Swedish station
● 110 pulsars being monitored
● New computing facilities at the last commissioning stages
● A large variety of ongoing ISM/IPM studies, reaching an unprecedented level of measurement accuracy