A bright, high rotation-measure FRB that skewers the M33 halo
| Autor: | G. van Diepen, Harish Vedantham, A. H. W. M. Coolen, N. J. Vermaas, W. J. G. de Blok, Emily Petroff, Vanessa A. Moss, M. Ruiter, E. Kooistra, Dany Vohl, J. E. Hargreaves, Alessio Sclocco, Liam Connor, Jisk Attema, J. E. Bast, A. M. Kutkin, Stefan J. Wijnholds, S. M. Straal, Á. Mika, S. Damstra, D. van der Schuur, Robert Schulz, Henk Mulder, B. Adebahr, Oliver M. Boersma, G. Marcel Loose, J. Ziemke, Tom Oosterloo, D. M. Lucero, Inés Pastor-Marazuela, B. Hut, L. C. Oostrum, Elizabeth A. K. Adams, R. Smits, W. A. van Cappellen, Yogesh Maan, D. W. Gardenier, J. van Leeuwen, H. Dénes, Kelley M. Hess, B. S. Frank |
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| Přispěvatelé: | Astronomy, High Energy Astrophys. & Astropart. Phys (API, FNWI), API Other Research (FNWI) |
| Rok vydání: | 2020 |
| Předmět: |
Andromeda Galaxy
Astrophysics::High Energy Astrophysical Phenomena Milky Way FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences fast radio bursts Radio telescope symbols.namesake 0103 physical sciences Faraday effect 010306 general physics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics High Energy Astrophysical Phenomena (astro-ph.HE) Physics Fast radio burst Astrophysics::Instrumentation and Methods for Astrophysics Local Group Astronomy and Astrophysics Galaxy Space and Planetary Science symbols Halo Astrophysics - High Energy Astrophysical Phenomena |
| Zdroj: | Monthly Notices of the Royal Astronomical Society, 499, 4716-4724. Oxford University Press Monthly Notices of the Royal Astronomical Society Monthly Notices of the Royal Astronomical Society, 499(4), 4716-4724. Oxford University Press |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/staa3009 |
| Popis: | We report the detection of a bright fast radio burst, FRB 191108, with Apertif on the Westerbork Synthesis Radio Telescope. The interferometer allows us to localize the FRB to a narrow 5 arcsec × 7 arcmin ellipse by employing both multibeam information within the Apertif phased-array feed beam pattern, and across different tied-array beams. The resulting sightline passes close to Local Group galaxy M33, with an impact parameter of only 18 kpc with respect to the core. It also traverses the much larger circumgalactic medium (CGM) of M31, the Andromeda Galaxy. We find that the shared plasma of the Local Group galaxies could contribute ∼10 per cent of its dispersion measure of 588 pc cm−3. FRB 191108 has a Faraday rotation measure (RM) of +474 $\pm \, 3$ rad m−2, which is too large to be explained by either the Milky Way or the intergalactic medium. Based on the more moderate RMs of other extragalactic sources that traverse the halo of M33, we conclude that the dense magnetized plasma resides in the host galaxy. The FRB exhibits frequency structure on two scales, one that is consistent with quenched Galactic scintillation and broader spectral structure with Δν ≈ 40 MHz. If the latter is due to scattering in the shared M33/M31 CGM, our results constrain the Local Group plasma environment. We found no accompanying persistent radio sources in the Apertif imaging survey data. |
| Databáze: | OpenAIRE |
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