Rubina Kotak QUB Martin Ward Durham lofar org
Rubina Kotak (QUB), Martin Ward (Durham) lofar. org Synergies between PS 1 -transients KPs and the LOFARtransients KSP
PS 1 – LOFAR transients Focus here is on complementarity / possible exchange of information of transient events (only) between PS 1 and LOFAR. Mo. U between LOFAR continuum surveys (LOFAR Surveys Key Science Projects) and PS 1 SC well under way => not discussed here.
Transient science with PS 1+LOFAR ü Large collecting area + field-of-view ü Both deep and wide (“all accessible sky”) surveys ü Timescales: LOFAR: nano sec – years PS 1: hours - years ü Substantial overlap in (known) types of transients e. g. jet sources (AGN, GRBs, microquasars etc. ), SNe, flare stars, planets etc. ü Potential to find rare / new types of transients
Possible first step: Ingest catalogue of LOFAR transients into e. g. QUB transient classifier (positional info. + flux density + epoch) Correlation with catalogues of known sources e. g. SDSS, NED (Probabilistic classification already being done for finding PS 1 candidate SNe) Known / new optical counterpart VO event? Provide catalogue of upper limits? Classification of transients from combined information
Example of a joint project: highly variable extragalactic transients/flares these are likely to be quite rare events, but no all-sky statistics available yet…
Jet Physics: constraining the models • About 40 AGN, mostly Blazars, are detected at Te. V energies, eg. using Whipple, CAT, HEGRA, H. E. S. S, MAGIC and VERITAS • Some spectacular cases eg. PKS 2155 -30 which has significant variability on minutes – cannot be ct light crossing distance across BH • Fundamental information about origin and evolution of jets with gamma > 50 (link with GRBs) • LOFAR (radio) plus Pan. STARRS (optical) plus Te. V, gives SED needed to unravel the problem
Co. Compact Source Variabilityt
Co. SED of Blazar during a flare (see recent review by Aller, Hughes and Aller 2010)t. A
SEDs of Te. V detected Blazars
Open Issues • Any flexibility in observing / strategy? e. g. co-ordination of selected fields targeted? (Note: PS 1 fields + observing strategy ~ fixed for various KPs) • Relevant timescales (need for quasi-synchronization? ) • Mechanism (and format) for exchange of information – who triggers who to focus on interesting events? • Follow-up observations on medium sized telescopes (To. O programmes)
- Slides: 10