D. Carbone, P. Carroll, A. Dabbech, H. Garsden, A. van der Horst, A. Mints, R. Paladino, D. Rafferty, A. Rowlinson, A. Shulevski, J. Swinbank, S. van Velzen. http://www.lofar.org/wiki/doku.php?id=commissioning:source_finders
D. Carbone, P. Carroll, A. Dabbech, H. Garsden, A. van der Horst, A. Mints, R. Paladino, D. Rafferty, A. Rowlinson, A. Shulevski, J. Swinbank, S. van Velzen. http://www.lofar.org/wiki/doku.php?id=commissioning:source_finders Main aims • Identify the best settings for automatically running source finders in LOFAR/MSSS/TRAP pipelines • Report bugs and needs to developers and provide support to LOFAR users • LOFAR representative in the international radio source finding discussion
real LOFAR data • Presence of both testers and developers • Finding & fixing bugs • Evaluate the performance of the SF tools TO BE DONE • Test SF tools on reliable simulated LOFAR maps • Participate to the international campaign on SF by Hancock et al.
that are important to set for optimizing source finders? Detection threshold, Analysis threshold, False Detection Rate, RMS box and Adaptive RMS box, Margins or radius, Beam infos, De-blending and Extended sources detection i. Which source finders should we keep testing? We should focus our tests on PySE and PyBDSM.
introduce in theoretical error bars given by the source finder tools? The position errors are underestimated by PyBDSM and systematics errors have to be introduced. Better constrains will be put using simulated maps. ii. Which are the parameters that are important to set for optimizing source finders? Detection threshold, Analysis threshold, False Detection Rate, RMS box and Adaptive RMS box, Margins or radius, Beam infos, De-blending and Extended sources detection i. Which source finders should we keep testing? We should focus our tests on PySE and PyBDSM.
and strategy should we use in order to combine different catalogs? B. Scheers's method: the De Ruiter radius, taking into account position errors and thus preventing spurious source associations. CAVEAT: without appropriate systematic position errors very bright sources could be NOT associated.
and strategy should we use in order to combine different catalogs? B. Scheers's method: the De Ruiter radius, taking into account position errors and thus preventing spurious source associations. CAVEAT: without appropriate systematic position errors very bright sources could be NOT associated. v. Which source extraction and association strategy should we use for multi-band LOFAR catalogs? MSSS scripts and spectral module of PyBDSM being tested to make multi-band LOFAR catalogs. Could be implemented in PYSE if desirable.
visibilities of a true LOFAR MS to have the directional dependent gains already in place. – input simulated sources in the visibilities, centered on the pointing center of the original LOFAR MS, keeping the instrument table untouched. The simulated source must be in BBS format. – calibrate and image the obtained MS as a normal observation.
best settings for automatically running source finders • Report bugs to developers and provide support to LOFAR users Work done: • Tests on real LOFAR data • Evaluate the performance of the SF tools Work to be done: • Test SF tools on reliable simulated LOFAR maps