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| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 10334naa a2201441 4500 | |
| 001 | oai:research.chalmers.se:d2da5d47-6ed6-44c0-a98b-379a2bb8c77c | |
| 003 | SwePub | |
| 008 | 171007s2013 | |||||||||||000 ||eng| | |
| 024 | 7 | a https://doi.org/10.1051/0004-6361/2012210012 DOI |
| 024 | 7 | a https://research.chalmers.se/publication/1764922 URI |
| 040 | a (SwePub)cth | |
| 041 | a engb eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a art2 swepub-publicationtype |
| 072 | 7 | a ref2 swepub-contenttype |
| 100 | 1 | a Asgekar, A.u Shell Technology Center4 aut |
| 245 | 1 0 | a LOFAR detections of low-frequency radio recombination lines towards Cassiopeia A |
| 264 | c 2013-02-28 | |
| 264 | 1 | b EDP Sciences,c 2013 |
| 338 | a electronic2 rdacarrier | |
| 520 | a Cassiopeia A was observed using the low-band antennas of the LOw Frequency ARray (LOFAR) with high spectral resolution. This allowed a search for radio recombination lines (RRLs) along the line-of-sight to this source. Five carbon alpha RRLs were detected in absorption between 40 and 50 MHz with a signal-to-noise ratio of >5 from two independent LOFAR data sets. The derived line velocities (v(LSR) similar to -50 km s(-1)) and integrated optical depths (similar to 13 s(-1)) of the RRLs in our spectra, extracted over the whole supernova remnant, are consistent within each LOFAR data set and with those previously reported. For the first time, we are able to extract spectra against the brightest hotspot of the remnant at frequencies below 330 MHz. These spectra show significantly higher (15-80 percent) integrated optical depths, indicating that there is small-scale angular structure of the order of similar to 1 pc in the absorbing gas distribution over the face of the remnant. We also place an upper limit of 3 x 10(-4) on the peak optical depths of hydrogen and helium RRLs. These results demonstrate that LOFAR has the desired spectral stability and sensitivity to study faint recombination lines in the decameter band. | |
| 650 | 7 | a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe |
| 650 | 7 | a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng |
| 653 | a ISM: individual objects: Cassiopeia A | |
| 653 | a Radio lines: ISM | |
| 653 | a ISM: clouds | |
| 700 | 1 | a Oonk, J. B. R.u Universiteit Leiden (UL),Leiden University (UL)4 aut |
| 700 | 1 | a Yatawatta, S.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a van Weeren, R. J.u Universiteit Leiden (UL),Leiden University (UL)4 aut |
| 700 | 1 | a McKean, J. P.u Rijksuniversiteit Groningen,University of Groningen4 aut |
| 700 | 1 | a White, G.u Open University4 aut |
| 700 | 1 | a Jackson, N.u University of Manchester4 aut |
| 700 | 1 | a Anderson, J.u Technische Universität Berlin4 aut |
| 700 | 1 | a Avruch, I. M.u Rijksuniversiteit Groningen,University of Groningen4 aut |
| 700 | 1 | a Batejat, Fabien,d 1979u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)em1fabat |
| 700 | 1 | a Beck, R.u Max-Planck Institut für Radioastronomie,Max-Planck Institute for Radio Astronomy4 aut |
| 700 | 1 | a Bell, M. E.u University of Technology Sydney4 aut |
| 700 | 1 | a Bell, M. R.u Max-Planck-Institut für Astrophysik,Max Planck Institute for Astrophysics4 aut |
| 700 | 1 | a van Bemmel, I.u Joint Institute for VLBI in Europe (JIVE)4 aut |
| 700 | 1 | a Bentum, M. J.u Universiteit Twente,University of Twente4 aut |
| 700 | 1 | a Bernardi, G.u Istituto di Radioastronomia4 aut |
| 700 | 1 | a Best, P.u University of Edinburgh4 aut |
| 700 | 1 | a Birzan, L.u Universität Hamburg,University of Hamburg4 aut |
| 700 | 1 | a Bonafede, A.u Istituto di Radioastronomia4 aut |
| 700 | 1 | a Braun, R.u SKA Organisation4 aut |
| 700 | 1 | a Breitling, F.u Leibniz-Institut Für Astrophysik Potsdam,Leibniz Institute for Astrophysics Potsdam4 aut |
| 700 | 1 | a van de Brink, R. H.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Broderick, J.u Curtin University4 aut |
| 700 | 1 | a Brouw, W. N.u Rijksuniversiteit Groningen,University of Groningen4 aut |
| 700 | 1 | a Brüggen, M.u Universität Hamburg,University of Hamburg4 aut |
| 700 | 1 | a Butcher, H. R.u Australian National University4 aut |
| 700 | 1 | a van Cappellen, W.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Ciardi, B.u Max-Planck-Institut für Astrophysik,Max Planck Institute for Astrophysics4 aut |
| 700 | 1 | a Conway, John,d 1963u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)jconway |
| 700 | 1 | a De Gasperin, F.u Universität Hamburg,University of Hamburg4 aut |
| 700 | 1 | a de Geus, E.4 aut |
| 700 | 1 | a de Jong, A.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a de Vos, M.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Duscha, S.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Eisloffel, J.u Thüringer Landessternwarte Tautenburg4 aut |
| 700 | 1 | a Falcke, H.u Max-Planck Institut für Radioastronomie,Max-Planck Institute for Radio Astronomy4 aut |
| 700 | 1 | a Fallows, R. A.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Ferrari, C.u Observatoire de la Cote d'Azur4 aut |
| 700 | 1 | a Frieswijk, W.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Garrett, M. A.u Universiteit Leiden (UL),Leiden University (UL)4 aut |
| 700 | 1 | a Griessmeier, J. M.u Universite d'Orleans,University of Orléans4 aut |
| 700 | 1 | a Grit, T.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Gunst, A. W.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Hassall, T. E.u University of Southampton4 aut |
| 700 | 1 | a Heald, G.u Commonwealth Scientific and Industrial Research Organisation (CSIRO)4 aut |
| 700 | 1 | a Hessels, J. W. T.u Universiteit Van Amsterdam,University of Amsterdam4 aut |
| 700 | 1 | a Hoeft, M.u Thüringer Landessternwarte Tautenburg4 aut |
| 700 | 1 | a Iacobelli, M.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Intema, H.u Curtin University4 aut |
| 700 | 1 | a Juette, E.u Ruhr-Universität Bochum4 aut |
| 700 | 1 | a Karastergiou, A.u University Of Oxford4 aut |
| 700 | 1 | a Kohler, J.u Max-Planck Institut für Radioastronomie,Max-Planck Institute for Radio Astronomy4 aut |
| 700 | 1 | a Kondratiev, V. I.u Russian Academy of Sciences4 aut |
| 700 | 1 | a Kuniyoshi, M.u National Astronomical Observatory of Japan4 aut |
| 700 | 1 | a Kuper, G.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Law, C.u California Institute of Technology (Caltech)4 aut |
| 700 | 1 | a van Leeuwen, J.u Universiteit Van Amsterdam,University of Amsterdam4 aut |
| 700 | 1 | a Maat, P.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Macario, G.u Osservatorio Astrofisico di Arcetri,Arcetri Astrophysical Observatory4 aut |
| 700 | 1 | a Mann, G.u Leibniz-Institut Für Astrophysik Potsdam,Leibniz Institute for Astrophysics Potsdam4 aut |
| 700 | 1 | a Markoff, S.u Universiteit Van Amsterdam,University of Amsterdam4 aut |
| 700 | 1 | a McKay-Bukowski, D.u STFC Rutherford Appleton Laboratory4 aut |
| 700 | 1 | a Mevius, M.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Miller-Jones, J. C. A.u Curtin University4 aut |
| 700 | 1 | a Mol, J. D.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Morganti, R.u Rijksuniversiteit Groningen,University of Groningen4 aut |
| 700 | 1 | a Mulcahy, D. D.u University of Southampton4 aut |
| 700 | 1 | a Munk, H.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Norden, M. J.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Orru, E.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Paas, H.u Rijksuniversiteit Groningen,University of Groningen4 aut |
| 700 | 1 | a Pandey-Pommier, M.u Université de Lyon4 aut |
| 700 | 1 | a Pandey, V. N.u University of Melbourne4 aut |
| 700 | 1 | a Pizzo, R.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Polatidis, A. G.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Reich, W.u Max-Planck Institut für Radioastronomie,Max-Planck Institute for Radio Astronomy4 aut |
| 700 | 1 | a Rottgering, H.u Universiteit Leiden (UL),Leiden University (UL)4 aut |
| 700 | 1 | a Scheers, B.u Stichting Centrum voor Wiskunde & Informatica (CWI)4 aut |
| 700 | 1 | a Schoenmakers, A.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Sluman, J.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Smirnov, O.4 aut |
| 700 | 1 | a Sobey, C.u Commonwealth Scientific and Industrial Research Organisation (CSIRO)4 aut |
| 700 | 1 | a Steinmetz, M.u Leibniz-Institut Für Astrophysik Potsdam,Leibniz Institute for Astrophysics Potsdam4 aut |
| 700 | 1 | a Tagger, M.u Universite d'Orleans,University of Orléans4 aut |
| 700 | 1 | a Tang, Y.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Tasse, C.u Observatoire de Paris-Meudon4 aut |
| 700 | 1 | a Vermeulen, R.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Vocks, C.u Leibniz-Institut Für Astrophysik Potsdam,Leibniz Institute for Astrophysics Potsdam4 aut |
| 700 | 1 | a Wijers, Ramju Universiteit Van Amsterdam,University of Amsterdam4 aut |
| 700 | 1 | a Wise, M. W.u Universiteit Van Amsterdam,University of Amsterdam4 aut |
| 700 | 1 | a Wucknitz, O.u Max-Planck Institut für Radioastronomie,Max-Planck Institute for Radio Astronomy4 aut |
| 700 | 1 | a Zarka, P.u LESIA - Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique4 aut |
| 710 | 2 | a Shell Technology Centerb Universiteit Leiden (UL)4 org |
| 773 | 0 | t Astronomy and Astrophysicsd : EDP Sciencesg 551q 551x 0004-6361x 1432-0746 |
| 856 | 4 | u http://publications.lib.chalmers.se/records/fulltext/176492/local_176492.pdfx primaryx freey FULLTEXT |
| 856 | 4 | u https://www.aanda.org/articles/aa/pdf/2013/03/aa21001-12.pdf |
| 856 | 4 8 | u https://doi.org/10.1051/0004-6361/201221001 |
| 856 | 4 8 | u https://research.chalmers.se/publication/176492 |
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