LOFAR 150-MHz observations of SS 433 and W50

Broderick, JW; Fender, RP; Miller-Jones, JCA; Trushkin, SA; Stewart, AJ; Anderson, GE; Staley, TD; Blundell, KM; Pietka, M; Markoff, S; Rowlinson, A; Swinbank, JD; van der Horst, AJ; Bell, ME; Breton, RP; Carbone, D; Corbel, S; Eislöffel, J; Falcke, H; Grießmeier, JM; Hessels, JWT; Kondratiev, VI; Law, CJ; Molenaar, GJ; Serylak, M; Stappers, BW; van Leeuwen, J; Wijers, RAMJ; Wijnands, R; Wise, MW; Zarka, P

LOFAR 150-MHz observations of SS 433 and W50

Broderick, JW Fender, RP Miller-Jones, JCA Trushkin, SA Stewart, AJ Anderson, GE Staley, TD Blundell, KM Pietka, M Markoff, S Rowlinson, A Swinbank, JD van der Horst, AJ Bell, ME

Breton, RP Carbone, D Corbel, S Eislöffel, J Falcke, H Grießmeier, JM Hessels, JWT Kondratiev, VI Law, CJ Molenaar, GJ Serylak, M Stappers, BW van Leeuwen, J Wijers, RAMJ Wijnands, R Wise, MW Zarka, P

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Publication Type:: Journal Article
Citation:: Monthly Notices of the Royal Astronomical Society, 2018, 475 (4), pp. 5360 - 5377
Issue Date:: 2018-04-21

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Field	Value	Language
dc.contributor.author	Broderick, JW	en_US
dc.contributor.author	Fender, RP	en_US
dc.contributor.author	Miller-Jones, JCA	en_US
dc.contributor.author	Trushkin, SA	en_US
dc.contributor.author	Stewart, AJ	en_US
dc.contributor.author	Anderson, GE	en_US
dc.contributor.author	Staley, TD	en_US
dc.contributor.author	Blundell, KM	en_US
dc.contributor.author	Pietka, M	en_US
dc.contributor.author	Markoff, S	en_US
dc.contributor.author	Rowlinson, A	en_US
dc.contributor.author	Swinbank, JD	en_US
dc.contributor.author	van der Horst, AJ	en_US
dc.contributor.author	Bell, ME https://orcid.org/0000-0003-1767-5277	en_US
dc.contributor.author	Breton, RP	en_US
dc.contributor.author	Carbone, D	en_US
dc.contributor.author	Corbel, S	en_US
dc.contributor.author	Eislöffel, J	en_US
dc.contributor.author	Falcke, H	en_US
dc.contributor.author	Grießmeier, JM	en_US
dc.contributor.author	Hessels, JWT	en_US
dc.contributor.author	Kondratiev, VI	en_US
dc.contributor.author	Law, CJ	en_US
dc.contributor.author	Molenaar, GJ	en_US
dc.contributor.author	Serylak, M	en_US
dc.contributor.author	Stappers, BW	en_US
dc.contributor.author	van Leeuwen, J	en_US
dc.contributor.author	Wijers, RAMJ	en_US
dc.contributor.author	Wijnands, R	en_US
dc.contributor.author	Wise, MW	en_US
dc.contributor.author	Zarka, P	en_US
dc.date.issued	2018-04-21	en_US
dc.identifier.citation	Monthly Notices of the Royal Astronomical Society, 2018, 475 (4), pp. 5360 - 5377	en_US
dc.identifier.issn	0035-8711	en_US
dc.identifier.uri	http://hdl.handle.net/10453/125930
dc.description.abstract	© 2017 The Author(s). 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.	en_US
dc.relation.ispartof	Monthly Notices of the Royal Astronomical Society	en_US
dc.relation.isbasedon	10.1093/mnras/sty081	en_US
dc.subject.classification	Astronomy & Astrophysics	en_US
dc.title	LOFAR 150-MHz observations of SS 433 and W50	en_US
dc.type	Journal Article
utslib.citation.volume	4	en_US
utslib.citation.volume	475	en_US
utslib.for	0201 Astronomical and Space Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	open_access
pubs.issue	4	en_US
pubs.publication-status	Published	en_US
pubs.volume	475	en_US

Abstract:

© 2017 The Author(s). 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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http://hdl.handle.net/10453/125930