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Pregled bibliografske jedinice broj: 766678

Studying Galactic interstellar turbulence through fluctuations in synchrotron emission. First LOFAR Galactic foreground detection

Iacobelli, M.; Haverkorn, M.; Orrú, E.; Pizzo, R. F.; Anderson, J.; Beck, R.; Bell, M. R.; Bonafede, A.; Chyzy, K.; Dettmar, R.- J. et al.
Studying Galactic interstellar turbulence through fluctuations in synchrotron emission. First LOFAR Galactic foreground detection // Astronomy and astrophysics, 558 (2013), A72-1 doi:10.1051/0004-6361/201322013 (međunarodna recenzija, članak, znanstveni)

CROSBI ID: 766678 Za ispravke kontaktirajte CROSBI podršku putem web obrasca

Naslov
Studying Galactic interstellar turbulence through fluctuations in synchrotron emission. First LOFAR Galactic foreground detection

Autori
Iacobelli, M. ; Haverkorn, M. ; Orrú, E. ; Pizzo, R. F. ; Anderson, J. ; Beck, R. ; Bell, M. R. ; Bonafede, A. ; Chyzy, K. ; Dettmar, R.- J. ; Enßlin, T. A. ; Heald, G. ; Horellou, C. ; Horneffer, A. ; Jurusik, W. ; Junklewitz, H. ; Kuniyoshi, M. ; Mulcahy, D. D. ; Paladino, R. ; Reich, W. ; Scaife, A. ; Sobey, C. ; Sotomayor-Beltran, C. ; Alexov, A. ; Asgekar, A. ; Avruch, I. M. ; Bell, M. E. ; van Bemmel, I. ; Bentum, M. J. ; Bernardi, G. ; Best, P. ; Bırzan, L. ; Breitling, F. ; Broderick, J. ; Brouw, W. N. ; Brüggen, M. ; Butcher, H. R. ; Ciardi, B. ; Conway, J. E. ; de Gasperin, F. ; de Geus, E. ; Duscha, S. ; Eislöffel, J. ; Engels, D. ; Falcke, H. ; Fallows, R. A. ; Ferrari, C. ; Frieswijk, W. ; Garrett, M. A. ; Grießmeier, J. ; Gunst, A. W. ; Hamaker, J. P. ; Hassall, T. E. ; Hessels, J. W. T. ; Hoeft, M. ; Hörandel, J. ; Jelić, Vibor ; Karastergiou, A. ; Kondratiev, V. I. ; Koopmans, L. V. E. ; Kramer, M. ; Kuper, G. ; van Leeuwen, J. ; Macario, G. ; Mann, G. ; McKean, J. P. ; Munk, H. ; Pandey- Pommier, M. ; Polatidis, A. G. ; Röttgering, H. ; Schwarz, D. ; Sluman, J. ; Smirnov, O. ; Stappers, B. W. ; Steinmetz, M. ; Tagger, M. ; Tang, Y. ; Tasse, C. ; Toribio, C. ; Vermeulen, R. ; Vocks, C. ; Vogt, C. ; van Weeren, R. J. ; Wise, M. W. ; Wucknitz, O. ; Yatawatta, S. ; Zarka, P. ; Zensus, A.

Izvornik
Astronomy and astrophysics (0004-6361) 558 (2013); A72-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
ISM: general; ISM: magnetic fields; ISM: structure; radio continuum: general; radio continuum: ISM; techniques: interferometric

Sažetak
The characteristic outer scale of turbulence (i.e. the scale at which the dominant source of turbulence injects energy to the interstellar medium) and the ratio of the random to ordered components of the magnetic field are key parameters to characterise magnetic turbulence in the interstellar gas, which affects the propagation of cosmic rays within the Galaxy. We provide new constraints to those two parameters. We use the LOw Frequency ARray (LOFAR) to image the diffuse continuum emission in the Fan region at (l, b) ~ (137.0°, +7.0°) at 80'' × 70'' resolution in the range [146, 174] MHz. We detect multi-scale fluctuations in the Galactic synchrotron emission and compute their power spectrum. Applying theoretical estimates and derivations from the literature for the first time, we derive the outer scale of turbulence and the ratio of random to ordered magnetic field from the characteristics of these fluctuations. We obtain the deepest image of the Fan region to date and find diffuse continuum emission within the primary beam. The power spectrum displays a power law behaviour for scales between 100 and 8 arcmin with a slope α = -1.84 ± 0.19. We find an upper limit of ~20 pc for the outer scale of the magnetic interstellar turbulence toward the Fan region, which is in agreement with previous estimates in literature. We also find a variation of the ratio of random to ordered field as a function of Galactic coordinates, supporting different turbulent regimes. We present the first LOFAR detection and imaging of the Galactic diffuse synchrotron emission around 160 MHz from the highly polarized Fan region. The power spectrum of the foreground synchrotron fluctuations is approximately a power law with a slope α ≈ -1.84 up to angular multipoles of ≲1300, corresponding to an angular scale of ~8 arcmin. We use power spectra fluctuations from LOFAR as well as earlier GMRT and WSRT observations to constrain the outer scale of turbulence (Lout) of the Galactic synchrotron foreground, finding a range of plausible values of 10-20 pc. Then, we use this information to deduce lower limits of the ratio of ordered to random magnetic field strength. These are found to be 0.3, 0.3, and 0.5 for the LOFAR, WSRT and GMRT fields considered respectively. Both these constraints are in agreement with previous estimates.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA

Profili:

Avatar Url Vibor Jelić (autor)

Poveznice na cjeloviti tekst rada:

doi arxiv.org www.aanda.org dx.doi.org

Citiraj ovu publikaciju:

Iacobelli, M.; Haverkorn, M.; Orrú, E.; Pizzo, R. F.; Anderson, J.; Beck, R.; Bell, M. R.; Bonafede, A.; Chyzy, K.; Dettmar, R.- J. et al.
Studying Galactic interstellar turbulence through fluctuations in synchrotron emission. First LOFAR Galactic foreground detection // Astronomy and astrophysics, 558 (2013), A72-1 doi:10.1051/0004-6361/201322013 (međunarodna recenzija, članak, znanstveni)
Iacobelli, M., Haverkorn, M., Orrú, E., Pizzo, R., Anderson, J., Beck, R., Bell, M., Bonafede, A., Chyzy, K. & Dettmar, R. (2013) Studying Galactic interstellar turbulence through fluctuations in synchrotron emission. First LOFAR Galactic foreground detection. Astronomy and astrophysics, 558, A72-1 doi:10.1051/0004-6361/201322013.
@article{article, author = {Iacobelli, M. and Haverkorn, M. and Orr\'{u}, E. and Pizzo, R. F. and Anderson, J. and Beck, R. and Bell, M. R. and Bonafede, A. and Chyzy, K. and Dettmar, R.- J. and Enßlin, T. A. and Heald, G. and Horellou, C. and Horneffer, A. and Jurusik, W. and Junklewitz, H. and Kuniyoshi, M. and Mulcahy, D. D. and Paladino, R. and Reich, W. and Scaife, A. and Sobey, C. and Sotomayor-Beltran, C. and Alexov, A. and Asgekar, A. and Avruch, I. M. and Bell, M. E. and van Bemmel, I. and Bentum, M. J. and Bernardi, G. and Best, P. and B\irzan, L. and Breitling, F. and Broderick, J. and Brouw, W. N. and Br\"{u}ggen, M. and Butcher, H. R. and Ciardi, B. and Conway, J. E. and de Gasperin, F. and de Geus, E. and Duscha, S. and Eisl\"{o}ffel, J. and Engels, D. and Falcke, H. and Fallows, R. A. and Ferrari, C. and Frieswijk, W. and Garrett, M. A. and Grießmeier, J. and Gunst, A. W. and Hamaker, J. P. and Hassall, T. E. and Hessels, J. W. T. and Hoeft, M. and H\"{o}randel, J. and Jeli\'{c}, Vibor and Karastergiou, A. and Kondratiev, V. I. and Koopmans, L. V. E. and Kramer, M. and Kuper, G. and van Leeuwen, J. and Macario, G. and Mann, G. and McKean, J. P. and Munk, H. and Pandey- Pommier, M. and Polatidis, A. G. and R\"{o}ttgering, H. and Schwarz, D. and Sluman, J. and Smirnov, O. and Stappers, B. W. and Steinmetz, M. and Tagger, M. and Tang, Y. and Tasse, C. and Toribio, C. and Vermeulen, R. and Vocks, C. and Vogt, C. and van Weeren, R. J. and Wise, M. W. and Wucknitz, O. and Yatawatta, S. and Zarka, P. and Zensus, A.}, year = {2013}, pages = {A72-1-A72-13}, DOI = {10.1051/0004-6361/201322013}, keywords = {ISM: general, ISM: magnetic fields, ISM: structure, radio continuum: general, radio continuum: ISM, techniques: interferometric}, journal = {Astronomy and astrophysics}, doi = {10.1051/0004-6361/201322013}, volume = {558}, issn = {0004-6361}, title = {Studying Galactic interstellar turbulence through fluctuations in synchrotron emission. First LOFAR Galactic foreground detection}, keyword = {ISM: general, ISM: magnetic fields, ISM: structure, radio continuum: general, radio continuum: ISM, techniques: interferometric} }
@article{article, author = {Iacobelli, M. and Haverkorn, M. and Orr\'{u}, E. and Pizzo, R. F. and Anderson, J. and Beck, R. and Bell, M. R. and Bonafede, A. and Chyzy, K. and Dettmar, R.- J. and Enßlin, T. A. and Heald, G. and Horellou, C. and Horneffer, A. and Jurusik, W. and Junklewitz, H. and Kuniyoshi, M. and Mulcahy, D. D. and Paladino, R. and Reich, W. and Scaife, A. and Sobey, C. and Sotomayor-Beltran, C. and Alexov, A. and Asgekar, A. and Avruch, I. M. and Bell, M. E. and van Bemmel, I. and Bentum, M. J. and Bernardi, G. and Best, P. and B\irzan, L. and Breitling, F. and Broderick, J. and Brouw, W. N. and Br\"{u}ggen, M. and Butcher, H. R. and Ciardi, B. and Conway, J. E. and de Gasperin, F. and de Geus, E. and Duscha, S. and Eisl\"{o}ffel, J. and Engels, D. and Falcke, H. and Fallows, R. A. and Ferrari, C. and Frieswijk, W. and Garrett, M. A. and Grießmeier, J. and Gunst, A. W. and Hamaker, J. P. and Hassall, T. E. and Hessels, J. W. T. and Hoeft, M. and H\"{o}randel, J. and Jeli\'{c}, Vibor and Karastergiou, A. and Kondratiev, V. I. and Koopmans, L. V. E. and Kramer, M. and Kuper, G. and van Leeuwen, J. and Macario, G. and Mann, G. and McKean, J. P. and Munk, H. and Pandey- Pommier, M. and Polatidis, A. G. and R\"{o}ttgering, H. and Schwarz, D. and Sluman, J. and Smirnov, O. and Stappers, B. W. and Steinmetz, M. and Tagger, M. and Tang, Y. and Tasse, C. and Toribio, C. and Vermeulen, R. and Vocks, C. and Vogt, C. and van Weeren, R. J. and Wise, M. W. and Wucknitz, O. and Yatawatta, S. and Zarka, P. and Zensus, A.}, year = {2013}, pages = {A72-1-A72-13}, DOI = {10.1051/0004-6361/201322013}, keywords = {ISM: general, ISM: magnetic fields, ISM: structure, radio continuum: general, radio continuum: ISM, techniques: interferometric}, journal = {Astronomy and astrophysics}, doi = {10.1051/0004-6361/201322013}, volume = {558}, issn = {0004-6361}, title = {Studying Galactic interstellar turbulence through fluctuations in synchrotron emission. First LOFAR Galactic foreground detection}, keyword = {ISM: general, ISM: magnetic fields, ISM: structure, radio continuum: general, radio continuum: ISM, techniques: interferometric} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus

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