Krzysztof T. Chyży, Jagiellonian University, Kraków

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1 Krzysztof T. Chyży, Jagiellonian University, Kraków

2 Outline Magnetism KSP (MSKP) organisation, people, meetings, received grants Cosmic targets, submitted proposals What s new in cosmic magnetism Synergy with

3 MKSP webpages Public webpage (scientific goals): (Webmaster: Rainer Beck) WIKI page (internal): (Webmaster: Enno Middelberg)

4 Management Team (4) MKSP Organisation Rainer Beck (PI) James Anderson Ger de Bruyn Anna Scaife MPIfR Bonn MPIfR Bonn ASTRON Dwingeloo Dublin Institute for Advanced Studies Full members (15) Invest at least 20% of working time P. Alexander (Cambridge), M. Brentjens (Dwingeloo), K. Chyży (Kraków), R.J. Dettmar (Bochum), S. Duscha (Garching), T. Ensslin (Garching), A. Fletcher (Newcastle), J.Geisbusch (Cambridge), M. Haverkorn (Dwingeloo), G. Heald (Dwingeloo), M.Kuniyoshi (Bonn), E. Middelberg (Bochum), A. Noutsos (Bonn), W. Reich (Bonn), Th.Riller (Garching) Associated members (25) G. Bernardi (Dwingeloo), D. Bomans (Bochum), M. Brüggen (Bremen), E. Carretti (Sydney), R.Drzazga (Kraków), J. Eislöffel (Tautenburg), L. Feretti (Bologna), K.Ferriere (Toulouse), D.Green (Cambridge), V. Heesen (Hertfordshire), M. Hoeft (Tautenburg), M. Jamrozy (Kraków), J.Kim (Cambridge), U. Klein (Bonn), M. Kramer (Bonn), M. Krause (Garching), R. Laing (Garching), E. Orru (Innsbruck), R. Paladino (Innsbruck), R. Pizzo (Dwingeloo), J. Riley (Cambridge), M. Soida (Kraków), B. Stappers (Manchester), M. Urbanik (Kraków), M.Weżgowiec (Bochum).

5 Science Working Groups 1. Milky Way (chair: Haverkorn) in collaboration with the Survey KSP 2. Pulsar RMs and the Galactic magnetic field (chair: Noutsos) in collaboration with the Transients KSP 3. Nearby galaxies (chairs: Beck & Chyży) in collaboration with the Survey KSP 4. Giant radio galaxies (chair: de Bruyn) in collaboration with the Survey KSP 5. Intergalactic filaments (chair: Alexander) in collaboration with the Survey & EoR KSPs 6. Polarised stellar jets (chair: Eislöffel) in collaboration with the Transients KSP

6 Documents Tasks Scientific Project Plan (PI: R. Beck) see MKSP webpage MKSP Chapter for LOFAR Special Issue of "Experimental Astronomy", submitted Observations Commissioning (all full members) Polarisation and ionosphere calibration (PI: G. de Bruyn) Test observations with WSRT and GMRT (PI: T. Arshakian) Data storage (PI: E. Middelberg) Data analysis Polarisation pipeline and RM Synthesis (PI: Th. Riller) Source finding in 2D and 3D (PI: E. Middelberg / A. Scaife) Visualisation of RM data cubes (PI: G. Heald) Simulations Simulation of polarized and RM sky (PI: W. Reich) Modelling depolarisation effects (PI: A. Fletcher) Magnetic field pattern recognition (PI: R. Beck / R. Stepanov)

7 Meetings Last Workshops: Cambridge March 2009 Garching October 2009 Technical meeting May 2009 Next Workshop: Dwingeloo on April 2010 followed by 3 busy days" of LOFAR data reduction focused on polarised sources (details: Marijke Haverkorn)

8 Magnetism research got funding DFG Research Unit: "Magnetisation of Interstellar and Intergalactic Media: The Prospects of Low-Frequency Radio Observations" Institutions PIs Argelander-Institut fuer Astronomie der Universitaet Bonn Astronomisches Institut der Ruhr-Universitaet Bochum Astrophysikalisches Institut Potsdam Jacobs University Bremen Ludwig-Maximilians-Universitaet Muenchen Max-Planck-Institut fuer Astrophysik Garching Max-Planck-Institut fuer Radioastronomie Bonn Thueringer Landessternwarte Tautenburg R. Beck (Co-Speaker), D. Bomans, M. Brueggen, R.-J. Dettmar, D. Elstner, T. Ensslin, M. Hoeft, U. Klein (Speaker), H. Lesch, W. Reich Fellowships for 11 PhD students and for 2 Postdocs; (applications are still accepted); money for workshops, travel and visitors

9 Magnetism research got funding Netherlands Organization for Scientific Research: "LOFAR Galactic Magnetism" PI Marijke Haverkorn Money to expand processing and storage power for the MKSP tasks Fellowships for a PhD student this year Postdocs next year

10 Targets MKSP proposals LOFAR MKSP Project Proposal, PI Rainer Beck, partly Trier 1,2 Milky Way nearby galaxies intergalactic filaments giant radio galaxies Polarisation from Stellar Jets, PI Anna Scaife, observe 5 known YSOs Broadband imaging of the Galactic plane, PI Marijke Haverkorn, Trier 1 Low Frequency Properties of the Magnetized ISM in M33, PI Fatemeh Tabatabaei (LOFAR+Hershel) Commissioning proposals: Jupiter, stellar jets (circular pol.), Galaxy (Fan region, CTA-1), nearby galaxies, software and long baselines testing More details in Rainer's and James's talks!

11 Galactic magnetism Reich priv. com. foreground influence is expected in any direction at low frequencies mapping small scale variations of B in 3-d (PI + RM) determine global structure of B with ~1000 new pulsars

12 Nearby galaxies origin of magnetic fields field topology in outer disk and halo dynamical importance of B strength and structure of magnetic fields ejected to the intergalactic space by perturbed galaxies Beck 2007, NGC 6946 LOFAR observations: 60 gal at 200 MHz with (Trier 1), statistical studies 7 targets in detail at 150 MHz (deep mapping and RM grids, 100h per gal.), physical processes in detail 6 targets for deep observations together with (Trier 2)

13 Waller et al Nearby ringed galaxy NGC 4736 Early type Sab opt The large oval causing outer and inner Lindblad resonances => mass accumulation The outer ring very weak The inner ring well-defined zone of star formation No distinct spiral arms Circular gas motions 200 km/s Magnetic field? UV

14 NGC 4736 B + Hα RM VLA 8.4 GHz, Chyży & Buta (2008) Thermal-synchrotron separation needed detailed modelling of CR difussion from the starbursting ring, estimation of B RM synthesis needed (a cube of Q,U images in Faraday depth space) to identify multiple Faraday-layers, Faraday screens, the Milky Way (Rainer's talk)

15 Puzzling PI structures 1.4 GHz observations show characteristic modulations of polarised intensity with azimuth, PI minimum always on the receding major axis must be modelled together with Faraday effects to explain Braun et al. 2010, arxiv:

16 B modes Field topology: in thick-disk an axisymmetric spiral with an out-of-disk quadrupole in the upper halo a radially directed dipole field (seen in highly-inclined galaxies) LOFAR will see polarised signal from even larger heights unobscured by the disk plane, will these PI structures be observed?

17 M51 Fletcher et al. 2010, arxiv: A large part (around 75%) of the strong polarised signal from M51 comes from anisotropic random magnetic fields!

18 M51 field topology axisymmetric bisymmetric Different B components in disk and halo LOFAR can detect the structure in the outer halo and verify the model

19 Galaxy groups Magnetic enrichment of the IGM Tidal interactions > rapid star formation > outflows of magnetized plasma > supply B to IGM 3 galaxy groups to be observed with LOFAR (150 MHz, 100h) How B is carried from galaxies, modified by shocks and shearing flows? Stephan's Quintet VLA 4.8 GHz TP+PIV-vecs, Soida et al. in prep. Are CRs accelerated in such structures?

20 Probing IGM with giant radio galaxies LOFAR Observations of 10 GRG diffuse cocoons at high-z modelling IGM, determine density independently of other methods

21 Cat II proposals. Synergy with 1. Galaxy clusters with LOFAR, Marcus Brűggen et al. Polarisation studies of radio relics, magnetic fields in clusters, RM Synthesis. 2. Broadband imaging of the Galactic plane, Marijke Haverkorn et al. Usefulness of polarisation noted. 3. Exploitation of LOFAR surveys for observations of Nearby Galaxies, John Conway et al. Cat I proposals 1. Commissioning observations of nearby clusters, Marcus Brűggen et al. Polarisation studies of faint diffuse emission, RM Synthesis 2. Commissioning the field around supernova remnant CTA-1, Marijke Havercorn et al. Testing polarisation capabilities for extended emission from the SNR shell 3. Extended and polarized emission of two nearby galaxies, Beck, Conway et al. NGC 6946, NGC 4631

22 10. Exploitation of LOFAR surveys for observations of Nearby Galaxies Tier 1-60 galaxies at 200 MHz The polarization data reduction will be led by members of the MKSP. A. 37 galaxies from a complete volume limited sample of galaxies up to 11 Mpc known as the Spitzer Local Volume Legacy Survey (LVL, Kennicutt et al. 2007). Statistically unbiased sample of 258 local volume galaxies in which a full diversity of galaxy properties (masses, luminosities, star-forming activities, metallicities) are represented. 184 LVL galaxies with DEC> 0, selecting those with estimated 200MHz flux > 110mJy gives 37 targets. The whole sky-surveys information for all the other sample members - the first radio analysis of a complete sample of nearby galaxies. B. 23 galaxies up to 37 Mpc distance (Table 1) from the MKSP list which are not already included in A. The list was optimized for the best scientific output taking into account already available high-quality radio data at high radio frequencies e.g. IC342, NGC6946, NGC4414, NGC891, NGC5775. C. The whole Virgo Cluster of galaxies Tier 2-6 deep pointings to NG At all the survey frequencies (200, 120, 60, 30 MHz) - High sensitivity polarization observations (with MKSP)

23 Great help from PhD students Robert Drzazga and Wojciech Jurusik

24 Arguments for frequency bands (can we change something?) Tier 3 1 freq. compromise between survey speed and sensitivity for RM (George Heald)

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