Journal articles
LOFAR detections of low-frequency radio recombination lines towards Cassiopeia A
Ashish Asgekar
1
J. B. R. Oonk
1
S. Yatawatta
2
R. J. van Weeren
1, 3
J. P. Mckean
1
G. White
4
N. Jackson
5
J. Anderson
6
I. M. Avruch
7
F. Batejat
8
R. Beck
9
M. E. Bell
10
M. R. Bell
10
I. van Bemmel
1
M. J. Bentum
1
G. Bernardi
11
P. Best
12
L. Birzan
13
A. Bonafede
14
R. Braun
15
F. Breitling
16
R. H. van de Brink
1
J. Broderick
10
W. N. Brouw
2
M. Bruggen
14
H. R. Butcher
1
W. van Cappellen
1
B. Ciardi
17
J. E. Conway
8
F. de Gasperin
18
E. de Geus
19
A. de Jong
1
M. de Vos
1
S. Duscha
1
J. Eisloffel
20
H. Falcke
21, 6, 1
R. A. Fallows
22
C. Ferrari
23
W. Frieswijk
1
M. A. Garrett
13, 1
Jean-Mathias Grießmeier
24, 25
T. Grit
1
A. W. Gunst
1
T. E. Hassall
26
G. Heald
1
J. W. T. Hessels
27
M. Hoeft
20
M. Iacobelli
28, 29
H. Intema
13
E. Juette
30
A. Karastergiou
31
J. Kohler
32
V. I. Kondratiev
1
M. Kuniyoshi
6
G. Kuper
1
C. Law
33
J. van Leeuwen
27
P. Maat
1
G. Macario
23
G. Mann
16
S. Markoff
33
D. Mckay-Bukowski
34
M. Mevius
1
J. C. A. Miller-Jones
33
J. D. Mol
1
R. Morganti
2, 1
D. D. Mulcahy
10
H. Munk
1
M. J. Norden
1
E. Orru
1
H. Paas
1
M. Pandey-Pommier
35
V. N. Pandey
36
R. Pizzo
1
A. G. Polatidis
1
W. Reich
6
H. Rottgering
13
B. Scheers
33
A. Schoenmakers
1
J. Sluman
1
O. Smirnov
37
C. Sobey
6
M. Steinmetz
16
Michel Tagger
24
Y. Tang
1
C. Tasse
38
R. Vermeulen
1
C. Vocks
16
R. A. M. J. Wijers
33
M. W. Wise
1, 33
O. Wucknitz
39
P. Zarka
38
Jean-Mathias Grießmeier 24, 25
Author Employer institution : Université d'Orléans IdHAL : jean-mathias-griessmeier arXiv : https://arxiv.org/a/griessmeier IdRef : https://www.idref.fr/235780871 ORCID : https://orcid.org/0000-0003-3362-7996 VIAF : https://viaf.org/viaf/20837572 ISNI : http://isni.org/isni/0000000020640428
T. Grit 1
Author
A. W. Gunst 1
Author
T. E. Hassall 26
Author
O. Smirnov 37
Author
C. Sobey 6
Author
M. Steinmetz 16
Author
Michel Tagger 24
Author IdHAL : michel-tagger ResearcherId : http://www.researcherid.com/rid/O-6615-2014 IdRef : https://www.idref.fr/097156310 ORCID : https://orcid.org/0000-0003-2962-3220
1
ASTRON - Netherlands Institute for Radio Astronomy (Oude Hoogeveensedijk 4, 7991 PD Dwingeloo / PO Box 2, 7990 AA Dwingeloo - Netherlands)
2
Kapteyn Astronomical Institute [Groningen] (PO Box 800, 9700 AV, Groningen - Netherlands)
- University of Groningen [Groningen] (PO Box 72 , 9700 AB Groningen - Netherlands)
3
CfA - Harvard-Smithsonian Center for Astrophysics (60 Garden Street, Cambridge, MA 02138, USA - United States)
- Smithsonian Institution (PO Box 37012, Washington, DC 20013-7012 - United States)
- Harvard University [Cambridge] (Massachusetts Hall, Cambridge, MA 02138 - United States)
4
SLAC - SLAC National Accelerator Laboratory (2575 Sand Hill Road, Menlo Park, CA 94025 - United States)
- Stanford University (450 Serra Mall, Stanford, CA 94305-2004 - United States)
5
Jodrell Bank Cent. for Astrophysics (France)
- University of Manchester [Manchester] (Oxford Rd, Manchester M13 9PL - United Kingdom)
6
MPIFR - Max-Planck-Institut für Radioastronomie (Auf dem Hügel 69 D-53121 Bonn - Germany)
7
SRON - SRON Netherlands Institute for Space Research (SRON Groningen, Landleven 12, 9747 AD Groningen - SRON Utrecht, Sorbonnelaan 2, 3584 CA Utrecht - Netherlands)
8
OSO - Onsala Space Observatory (Chalmers University of Technology, SE-439 92 Onsala, Sweden - Sweden)
- Chalmers University of Technology [Göteborg] (SE-412 96 Göteborg - Sweden)
9
LCPM - Laboratoire de Chimie Physique Moléculaire (Switzerland)
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10
University of Southampton (University Road, Southampton SO17 1BJ - United Kingdom)
11
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12
University of Edinburgh (Old College South Bridge Edinburgh EH8 9YL - United Kingdom)
13
Leiden Observatory [Leiden] (P.O. Box 9513, NL-2300 RA Leiden - Netherlands)
- Universiteit Leiden [Leiden] (P.O. Box 9500 2300 RA Leiden - Netherlands)
14
Jacobs University [Bremen] (Campus Ring 1, 28759 Bremen - Germany)
15
TU Dresden - Technische Universität Dresden = Dresden University of Technology (TU Dresden 01062 Dresden - Germany)
16
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17
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18
Hamburger Sternwarte/Hamburg Observatory (Gojenbergsweg 112, 21029 Hamburg - Germany)
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19
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TLS - Thüringer Landessternwarte Tautenburg ( Sternwarte 5, 07778 Tautenburg - Germany)
21
Radboud university [Nijmegen] (Comeniuslaan 4, 6525 HP Nijmegen - Netherlands)
22
Institute of Mathematical and Physical Sciences (United Kingdom)
23
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24
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25
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26
Jodrell Bank Centre for Astrophysics (M13 9PL;Manchester - United Kingdom)
- University of Manchester [Manchester] (Oxford Rd, Manchester M13 9PL - United Kingdom)
27
UvA - University of Amsterdam [Amsterdam] (Spui 21 1012 WX Amsterdam - Netherlands)
28
Sapienza University of Rome - Dipartimento di Matematica "Guido Castelnuovo" [Roma I] (Piazzale Aldo Moro 5, 00185 Roma - Italy)
- Università degli Studi di Roma "La Sapienza" = Sapienza University [Rome] (Piazzale Aldo Moro 5, 00185 Roma - Italy)
29
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30
Ruhr-Universität Bochum [Bochum] (Universitätsstraße 150, 44801 Bochum - Germany)
31
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- University of Oxford [Oxford] (Wellington Square, Oxford OX1 2JD - United Kingdom)
32
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33
AI PANNEKOEK - Astronomical Institute Anton Pannekoek (PO Box 94249, 1090 GE Amsterdam - Netherlands)
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34
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35
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36
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- NRAO - National Radio Astronomy Observatory (United States)
37
Rhodes University, Grahamstown (Rhodes University • Rhodes University, P.O. Box 94 Grahamstown 6140 South Africa - South Africa)
38
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39
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- Rheinische Friedrich-Wilhelms-Universität Bonn (Regina-Pacis-Weg 3, 53113 Bonn - Germany)
Abstract : 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 datasets. The derived line velocities (v_LSR ~ -50 km/s) and integrated optical depths (~ 13 s^-1) of the RRLs in our spectra, extracted over the whole supernova remnant, are consistent within each LOFAR dataset 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 %) integrated optical depths, indicating that there is small-scale angular structure on the order of ~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.
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Journal articles
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https://hal-insu.archives-ouvertes.fr/insu-01286281
Contributor : Nathalie Rouchon Connect in order to contact the contributor
Submitted on : Wednesday, September 27, 2017 - 9:41:05 AM
Last modification on : Tuesday, December 7, 2021 - 4:10:20 PM
Long-term archiving on: : Thursday, December 28, 2017 - 12:47:27 PM
Contributor : Nathalie Rouchon Connect in order to contact the contributor
Submitted on : Wednesday, September 27, 2017 - 9:41:05 AM
Last modification on : Tuesday, December 7, 2021 - 4:10:20 PM
Long-term archiving on: : Thursday, December 28, 2017 - 12:47:27 PM
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Identifiers
- HAL Id : insu-01286281, version 1
- ARXIV : 1302.3128v1
- BIBCODE : 2013A&A...551L..11A
- DOI : 10.1051/0004-6361/201221001
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Citation
Ashish Asgekar, J. B. R. Oonk, S. Yatawatta, R. J. van Weeren, J. P. Mckean, et al.. LOFAR detections of low-frequency radio recombination lines towards Cassiopeia A. Astronomy and Astrophysics - A&A, EDP Sciences, 2013, 551 (L11), 5 p. ⟨10.1051/0004-6361/201221001⟩. ⟨insu-01286281⟩
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