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LOFAR 150-MHz observations of SS 433 and W50

LOFAR 150-MHz observations of SS 433 and W50
LOFAR 150-MHz observations of SS 433 and W50

We present Low-Frequency Array (LOFAR) high-band data over the frequency range 115-189 MHz for the X-ray binary SS 433, obtained in an observing campaign from 2013 February to 2014 May. Our results include a deep, wide-field map, allowing a detailed view of the surrounding supernova remnant W50 at low radio frequencies, as well as a light curve for SS 433 determined from shorter monitoring runs. The complex morphology of W50 is in excellent agreement with previously published higher frequency maps; we find additional evidence for a spectral turnover in the eastern wing, potentially due to foreground free-free absorption. Furthermore, SS 433 is tentatively variable at 150 MHz, with both a debiased modulation index of 11 per cent and a Χ2 probability of a flat light curve of 8.2 × 10-3. By comparing the LOFAR flux densities with contemporaneous observations carried out at 4800 MHz with the RATAN-600 telescope, we suggest that an observed ~0.5-1 Jy rise in the 150-MHz flux density may correspond to sustained flaring activity over a period of approximately 6 months at 4800 MHz. However, the increase is too large to be explained with a standard synchrotron bubble model. We also detect a wealth of structure along the nearby Galactic plane, including the most complete detection to date of the radio shell of the candidate supernova remnant G38.7-1.4. This further demonstrates the potential of supernova remnant studies with the current generation of low-frequency radio telescopes.

ISM: individual objects: W50, ISM: jets and outflows, ISM: supernova remnants, Radio continuum: ISM, Radio continuum: starss, Stars: individual: SS 433
0035-8711
5360-5377
Broderick, J.W.
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Fender, R.P.
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Miller-Jones, J.C.A.
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Trushkin, S.A.
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Stewart, A.J.
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Anderson, G.E.
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Staley, T.D.
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Blundell, K.M.
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Pietka, M.
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Markoff, S.
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Rowlinson, A.
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Swinbank, J.D.
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van der Horst, A.J.
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Bell, M.E.
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Breton, R.P.
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Carbone, D.
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Corbel, S.
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Eislöffel, J.
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Falcke, H.
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Grießmeier, J.M.
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Hessels, J.W.T.
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Kondratiev, V.I.
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Law, C.J.
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Molenaar, G.J.
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Serylak, M.
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Stappers, B.W.
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van Leeuwen, J.
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Wijers, R.A.M.J.
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Wijnands, R.
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Wise, M.W.
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Zarka, P.
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Broderick, J.W.
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Fender, R.P.
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Miller-Jones, J.C.A.
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Trushkin, S.A.
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Stewart, A.J.
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Anderson, G.E.
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Staley, T.D.
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Blundell, K.M.
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Pietka, M.
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Markoff, S.
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Rowlinson, A.
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Swinbank, J.D.
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van der Horst, A.J.
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Bell, M.E.
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Breton, R.P.
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Carbone, D.
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Corbel, S.
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Eislöffel, J.
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Falcke, H.
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Grießmeier, J.M.
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Hessels, J.W.T.
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Kondratiev, V.I.
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Law, C.J.
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Molenaar, G.J.
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Serylak, M.
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Stappers, B.W.
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van Leeuwen, J.
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Wijers, R.A.M.J.
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Wijnands, R.
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Wise, M.W.
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Zarka, P.
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Broderick, J.W., Fender, R.P., Miller-Jones, J.C.A., Trushkin, S.A., Stewart, A.J., Anderson, G.E., Staley, T.D., Blundell, K.M., Pietka, M., Markoff, S., Rowlinson, A., Swinbank, J.D., van der Horst, A.J., Bell, M.E., Breton, R.P., Carbone, D., Corbel, S., Eislöffel, J., Falcke, H., Grießmeier, J.M., Hessels, J.W.T., Kondratiev, V.I., Law, C.J., Molenaar, G.J., Serylak, M., Stappers, B.W., van Leeuwen, J., Wijers, R.A.M.J., Wijnands, R., Wise, M.W. and Zarka, P. (2018) LOFAR 150-MHz observations of SS 433 and W50. Monthly Notices of the Royal Astronomical Society, 475 (4), 5360-5377. (doi:10.1093/mnras/sty081).

Record type: Article

Abstract

We present Low-Frequency Array (LOFAR) high-band data over the frequency range 115-189 MHz for the X-ray binary SS 433, obtained in an observing campaign from 2013 February to 2014 May. Our results include a deep, wide-field map, allowing a detailed view of the surrounding supernova remnant W50 at low radio frequencies, as well as a light curve for SS 433 determined from shorter monitoring runs. The complex morphology of W50 is in excellent agreement with previously published higher frequency maps; we find additional evidence for a spectral turnover in the eastern wing, potentially due to foreground free-free absorption. Furthermore, SS 433 is tentatively variable at 150 MHz, with both a debiased modulation index of 11 per cent and a Χ2 probability of a flat light curve of 8.2 × 10-3. By comparing the LOFAR flux densities with contemporaneous observations carried out at 4800 MHz with the RATAN-600 telescope, we suggest that an observed ~0.5-1 Jy rise in the 150-MHz flux density may correspond to sustained flaring activity over a period of approximately 6 months at 4800 MHz. However, the increase is too large to be explained with a standard synchrotron bubble model. We also detect a wealth of structure along the nearby Galactic plane, including the most complete detection to date of the radio shell of the candidate supernova remnant G38.7-1.4. This further demonstrates the potential of supernova remnant studies with the current generation of low-frequency radio telescopes.

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More information

Accepted/In Press date: 21 December 2017
e-pub ahead of print date: 12 January 2018
Published date: 21 April 2018
Keywords: ISM: individual objects: W50, ISM: jets and outflows, ISM: supernova remnants, Radio continuum: ISM, Radio continuum: starss, Stars: individual: SS 433

Identifiers

Local EPrints ID: 420533
URI: http://eprints.soton.ac.uk/id/eprint/420533
ISSN: 0035-8711
PURE UUID: 5167a7a5-3802-4030-a7c7-99f88c23d4f6

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Date deposited: 10 May 2018 16:30
Last modified: 07 Oct 2020 00:48

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Contributors

Author: J.W. Broderick
Author: R.P. Fender
Author: J.C.A. Miller-Jones
Author: S.A. Trushkin
Author: A.J. Stewart
Author: G.E. Anderson
Author: T.D. Staley
Author: K.M. Blundell
Author: M. Pietka
Author: S. Markoff
Author: A. Rowlinson
Author: J.D. Swinbank
Author: A.J. van der Horst
Author: M.E. Bell
Author: R.P. Breton
Author: D. Carbone
Author: S. Corbel
Author: J. Eislöffel
Author: H. Falcke
Author: J.M. Grießmeier
Author: J.W.T. Hessels
Author: V.I. Kondratiev
Author: C.J. Law
Author: G.J. Molenaar
Author: M. Serylak
Author: B.W. Stappers
Author: J. van Leeuwen
Author: R.A.M.J. Wijers
Author: R. Wijnands
Author: M.W. Wise
Author: P. Zarka

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