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A repeating fast radio burst source localized to a nearby spiral galaxy – Nature.com

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  • 1.

    Lorimer, D. R., Bailes, M., McLaughlin, M. A., Narkevic, D. J. & Crawford, F. A bright millisecond radio burst of extragalactic origin. Science 318, 777–780 (2007).

  • 2.

    Petroff, E., Hessels, J. W. T. & Lorimer, D. R. Fast radio bursts. Astron. Astrophys. Rev. 27, 4 (2019).

  • 3.

    Platts, E. et al. A living theory catalogue for fast radio bursts. Phys. Rep. 821, 1–27 (2019).

  • 4.

    Spitler, L. G. et al. A repeating fast radio burst. Nature 531, 202–205 (2016).

  • 5.

    CHIME/FRB Collaboration. A second source of repeating fast radio bursts. Nature 566, 235–238 (2019).

  • 6.

    The CHIME/FRB Collaboration. CHIME/FRB discovery of eight new repeating fast radio burst sources. Astrophys. J. 885, L24 (2019).

  • 7.

    Kumar, P. et al. Faint repetitions from a bright fast radio burst source. Preprint at https://arxiv.org/abs/1908.10026 (2019).

  • 8.

    Petroff, E. et al. FRBCAT: The Fast Radio Burst Catalogue. Publ. Astron. Soc. Aust. 33, e045 (2016).

  • 9.

    Chatterjee, S. et al. A direct localization of a fast radio burst and its host. Nature 541, 58–61 (2017).

  • 10.

    Ravi, V. et al. A fast radio burst localized to a massive galaxy. Nature 572, 352–354 (2019).

  • 11.

    Bannister, K. W. et al. A single fast radio burst localized to a massive galaxy at cosmological distance. Science 365, 565–570 (2019).

  • 12.

    Prochaska, J. X. et al. The low density and magnetization of a massive galaxy halo exposed by a fast radio burst. Science 366, 231–234 (2019).

  • 13.

    Lazarus, P. et al. Prospects for high-precision pulsar timing with the new Effelsberg PSRIX backend. Mon. Not. R. Astron. Soc. 458, 868–880 (2016).

  • 14.

    Marcote, B. et al. The repeating fast radio burst FRB 121102 as seen on milliarcsecond angular scales. Astrophys. J. 834, L8 (2017).

  • 15.

    Alam, S. et al. The eleventh and twelfth data releases of the Sloan Digital Sky Survey: final data from SDSS-III. Astrophys. J. Suppl. 219, 12 (2015).

  • 16.

    Wright, E. L. A cosmology calculator for the world wide web. Publ. Astron. Soc. Pacif. 118, 1711–1715 (2006).

  • 17.

    Tendulkar, S. P. et al. The host galaxy and redshift of the repeating fast radio burst FRB 121102. Astrophys. J. 834, L7 (2017).

  • 18.

    Gusev, A. S. Hierarchy and size distribution function of star formation regions in the spiral galaxy NGC 628. Mon. Not. R. Astron. Soc. 442, 3711–3721 (2014).

  • 19.

    Metzger, B. D., Berger, E. & Margalit, B. Millisecond magnetar birth connects FRB 121102 to superluminous supernovae and long-duration gamma-ray bursts. Astrophys. J. 841, 14 (2017).

  • 20.

    Guillochon, J., Parrent, J., Kelley, L. Z. & Margutti, R. An open catalog for supernova data. Astrophys. J. 835, 64 (2017).

  • 21.

    Michilli, D. et al. An extreme magneto-ionic environment associated with the fast radio burst source FRB 121102. Nature 553, 182–185 (2018).

  • 22.

    Margalit, B. & Metzger, B. D. A concordance picture of FRB 121102 as a flaring magnetar embedded in a magnetized ion-electron wind nebula. Astrophys. J. 868, L4 (2018).

  • 23.

    Metzger, B. D., Margalit, B. & Sironi, L. Fast radio bursts as synchrotron maser emission from decelerating relativistic blast waves. Mon. Not. R. Astron. Soc. 485, 4091–4106 (2019).

  • 24.

    Ravi, V. The prevalence of repeating fast radio bursts. Nat. Astron. 3, 928–931 (2019).

  • 25.

    Margalit, B., Berger, E. & Metzger, B. D. Fast radio bursts from magnetars born in binary neutron star mergers and accretion induced collapse. Astrophys. J. 886, 110 (2019).

  • 26.

    Mahony, E. K. et al. A search for the host galaxy of FRB 171020. Astrophys. J. 867, L10 (2018).

  • 27.

    Bhandari, S. et al. The survey for pulsars and extragalactic radio bursts. II. New FRB discoveries and their follow-up. Mon. Not. R. Astron. Soc. 475, 1427–1446 (2018).

  • 28.

    Gourdji, K. et al. A sample of low-energy bursts from FRB 121102. Astrophys. J. 877, L19 (2019).

  • 29.

    Lyutikov, M. Fast radio bursts’ emission mechanism: implication from localization. Astrophys. J. 838, L13 (2017).

  • 30.

    Scholz, P. et al. The repeating fast radio burst FRB 121102: multi-wavelength observations and additional bursts. Astrophys. J. 833, 177 (2016).

  • 31.

    Scholz, P. et al. Simultaneous X-ray, gamma-ray, and radio observations of the repeating fast radio burst FRB 121102. Astrophys. J. 846, 80 (2017).

  • 32.

    Hardy, L. K. et al. A search for optical bursts from the repeating fast radio burst FRB 121102. Mon. Not. R. Astron. Soc. 472, 2800–2807 (2017).

  • 33.

    MAGIC Collaboration. Constraining very-high-energy and optical emission from FRB 121102 with the MAGIC telescopes. Mon. Not. R. Astron. Soc. 481, 2479–2486 (2018).

  • 34.

    Cordes, J. M. & McLaughlin, M. A. Searches for fast radio transients. Astrophys. J. 596, 1142–1154 (2003).

  • 35.

    CHIME/FRB Collaboration. The CHIME fast radio burst project: system overview. Astrophys. J. 863, 48 (2018).

  • 36.

    Keimpema, A. et al. The SFXC software correlator for very long baseline interferometry: algorithms and implementation. Exp. Astron. 39, 259–279 (2015).

  • 37.

    Greisen, E. W. AIPS, the VLA, and the VLBA. In Information Handling in Astronomy. Historical Vistas (ed. Heck, A.) Vol. 285, 109 (Astrophysics and Space Science Library, 2003).

  • 38.

    Shepherd, M. C., Pearson, T. J. & Taylor, G. B. DIFMAP: an interactive program for synthesis imaging. Bull. Am. Astron. Soc. 26, 987–989 (1994).

  • 39.

    Chatterjee, S. et al. Pulsar parallaxes at 5 GHz with the Very Long Baseline Array. Astrophys. J. 604, 339–345 (2004).

  • 40.

    Pradel, N., Charlot, P. & Lestrade, J. F. Astrometric accuracy of phase-referenced observations with the VLBA and EVN. Astron. Astrophys. 452, 1099–1106 (2006).

  • 41.

    Kirsten, F., Vlemmings, W., Campbell, R. M., Kramer, M. & Chatterjee, S. Revisiting the birth locations of pulsars B1929+10, B2020+28, and B2021+51. Astron. Astrophys. 577, A111 (2015).

  • 42.

    Ransom, S. M. New Search Techniques for Binary Pulsars. PhD thesis, Harvard Univ. https://ui.adsabs.harvard.edu/abs/2001PhDT…….123R/abstract (2001).

  • 43.

    Michilli, D. et al. Single-pulse classifier for the LOFAR tied-array all-sky survey. Mon. Not. R. Astron. Soc. 480, 3457–3467 (2018).

  • 44.

    Michilli, D. & Hessels, J. W. T. SpS: Single-pulse Searcher. Astrophys. Source Code Library 1806. 013 (2018).

  • 45.

    Hotan, A. W., van Straten, W. & Manchester, R. N. PSRCHIVE and PSRFITS: an open approach to radio pulsar data storage and analysis. Publ. Astron. Soc. Aust. 21, 302–309 (2004).

  • 46.

    Hessels, J. W. T. et al. FRB 121102 bursts show complex time-frequency structure. Astrophys. J. 876, L23 (2019).

  • 47.

    Law, C. J. et al. A multi-telescope campaign on FRB 121102: implications for the FRB population. Astrophys. J. 850, 76 (2017).

  • 48.

    Cordes, J. M., Weisberg, J. M. & Boriakoff, V. Small-scale electron density turbulence in the interstellar medium. Astrophys. J. 288, 221–247 (1985).

  • 49.

    Rickett, B. J. Radio propagation through the turbulent interstellar plasma. Annu. Rev. Astron. Astrophys. 28, 561–605 (1990).

  • 50.

    Cordes, J. M. & Lazio, T. J. W. NE2001.I. A new model for the galactic distribution of free electrons and its fluctuations. Preprint at https://arxiv.org/abs/astro-ph/0207156 (2002).

  • 51.

    Fomalont, E. B. & Perley, R. A. Calibration and editing. In Synthesis Imaging in Radio Astronomy II (eds Taylor, G. B., Carilli, C. L. & Perley, R. A.) Vol. 180, 79 (Astronomical Society of the Pacific Conference Series, 1999).

  • 52.

    Thompson, A. R. Fundamentals of Radio Interferometry. In Synthesis Imaging in Radio Astronomy II (eds Taylor, G. B., Carilli, C. L. & Perley, R. A.) Vol. 180, 11 (Astronomical Society of the Pacific Conference Series, 1999).

  • 53.

    Natarajan, I. et al. Resolving the blazar CGRaBS J0809+5341 in the presence of telescope systematics. Mon. Not. R. Astron. Soc. 464, 4306–4317 (2017).

  • 54.

    Law, C. J. et al. realfast: real-time, commensal fast transient surveys with the Very Large Array. Astrophys. J. Suppl. 236, 8 (2018).

  • 55.

    Condon, J. J. et al. The NRAO VLA sky survey. Astron. J. 115, 1693–1716 (1998).

  • 56.

    Bertin, E. & Arnouts, S. SExtractor: software for source extraction. Astron. Astrophys. Suppl. Ser. 117, 393–404 (1996).

  • 57.

    Gaia Collaboration. Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties. Astron. Astrophys. 595, A2 (2016).

  • 58.

    Gaia Collaboration. Gaia Data Release 2. Summary of the contents and survey properties. Astron. Astrophys. 616, A1 (2018).

  • 59.

    Jarrett, T. H. et al. Galaxy and Mass Assembly (GAMA): exploring the WISE web in G12. Astrophys. J. 836, 182 (2017).

  • 60.

    Kennicutt, J., Robert, C., Tamblyn, P. & Congdon, C. E. Past and future star formation in disk galaxies. Astrophys. J. 435, 22 (1994).

  • 61.

    Dopita, M. A., Kewley, L. J., Sutherland, R. S. & Nicholls, D. C. Chemical abundances in high-redshift galaxies: a powerful new emission line diagnostic. Astrophys. Space Sci. 361, 61 (2016).

  • 62.

    Faber, S. M. et al. Galaxy luminosity functions to z ~ 1 from DEEP2 and COMBO-17: implications for red galaxy formation. Astrophys. J. 665, 265–294 (2007).

  • 63.

    Blanton, M. R. et al. The galaxy luminosity function and luminosity density at redshift z = 0.1. Astrophys. J. 592, 819–838 (2003).

  • 64.

    Zhang, Y.-C. & Yang, X.-H. Size distribution of galaxies in SDSS DR7: weak dependence on halo environment. Res. Astron. Astrophys. 19, 006 (2019).

  • 65.

    Yao, J. M., Manchester, R. N. & Wang, N. A new electron-density model for estimation of pulsar and FRB Distances. Astrophys. J. 835, 29 (2017).

  • 66.

    Yamasaki, S. & Totani, T. The galactic halo contribution to the dispersion measure of extragalactic fast radio bursts. Preprint at https://arxiv.org/abs/1909.00849 (2019).

  • 67.

    Inoue, S. Probing the cosmic reionization history and local environment of gamma-ray bursts through radio dispersion. Mon. Not. R. Astron. Soc. 348, 999–1008 (2004).

  • 68.

    Li, Y., Zhang, B., Nagamine, K. & Shi, J. The FRB 121102 host is atypical among nearby fast radio bursts. Astrophys. J. 884, L26 (2019).

  • 69.

    Lyubarsky, Y. A model for fast extragalactic radio bursts. Mon. Not. R. Astron. Soc. 442, L9–L13 (2014).

  • 70.

    Beloborodov, A. M. A flaring magnetar in FRB 121102? Astrophys. J. 843, L26 (2017).

  • 71.

    Zhang, B. A “cosmic comb” model of fast radio bursts. Astrophys. J. 836, L32 (2017).

  • 72.

    Zhang, B. FRB 121102: a repeatedly combed neutron star by a nearby low-luminosity accreting supermassive black hole. Astrophys. J. 854, L21 (2018).

  • 73.

    Kewley, L. J., Dopita, M. A., Sutherland, R. S., Heisler, C. A. & Trevena, J. Theoretical modeling of starburst galaxies. Astrophys. J. 556, 121–140 (2001).

  • 74.

    Kewley, L. J. & Dopita, M. A. Using strong lines to estimate abundances in extragalactic H II regions and starburst galaxies. Astrophys. J. Suppl. 142, 35–52 (2002).

  • 75.

    Kauffmann, G. et al. The host galaxies of active galactic nuclei. Mon. Not. R. Astron. Soc. 346, 1055–1077 (2003).

  • 76.

    Loewenstein, M., Mushotzky, R. F., Angelini, L., Arnaud, K. A. & Quataert, E. Chandra limits on X-ray emission associated with the supermassive black holes in three giant elliptical galaxies. Astrophys. J. 555, L21–L24 (2001).

  • 77.

    Astropy Collaboration. Astropy: a community Python package for astronomy. Astron. Astrophys. 558, A33 (2013).

  • 78.

    Hunter, J. D. Matplotlib: a 2D graphics environment. Comput. Sci. Eng. 9, 90–95 (2007).

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    Asteroid samples escaping from jammed NASA spacecraft – CP24 Toronto's Breaking News

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    CAPE CANAVERAL, Fla. – A NASA spacecraft is stuffed with so much asteroid rubble from this week’s grab that it’s jammed open and precious particles are drifting away in space, scientists said Friday.

    Scientists announced the news three days after the spacecraft named Osiris-Rex briefly touched asteroid Bennu, NASA’s first attempt at such a mission.

    The mission’s lead scientist, Dante Lauretta of the University of Arizona, said Tuesday’s operation 200 million miles away collected far more material than expected for return to Earth – in the hundreds of grams. The sample container on the end of the robot arm penetrated so deeply into the asteroid and with such force, however, that rocks got sucked in and became wedged around the rim of the lid.

    Scientists estimate the sampler pressed as much as 19 inches (48 centimetres) into the rough, crumbly, black terrain.

    “We’re almost a victim of our own success here,” Lauretta said at a hastily arranged news conference.

    Lauretta said there is nothing flight controllers can do to clear the obstructions and prevent more bits of Bennu from escaping, other than to get the samples into their return capsule as soon as possible.

    So, the flight team was scrambling to put the sample container into the capsule as early as Tuesday – much sooner than originally planned – for the long trip home.

    “Time is of the essence,” said Thomas Zurbuchen, chief of NASA’s science missions.

    This is NASA’s first asteroid sample-return mission. Bennu was chosen because its carbon-rich material is believed to hold the preserved building blocks of our solar system. Getting pieces from this cosmic time capsule could help scientists better understand how the planets formed billions of years ago and how life originated on Earth.

    Scientists were stunned – and then dismayed – on Thursday when they saw the pictures coming from Osiris-Rex following its wildly successful touch-and-go at Bennu two days earlier.

    A cloud of asteroid particles could be seen swirling around the spacecraft as it backed away from Bennu. The situation appeared to stabilize, according to Lauretta, once the robot arm was locked into place. But it was impossible to know exactly how much had already been lost.

    The requirement for the $800 million-plus mission was to bring back a minimum 2 ounces (60 grams).

    Regardless of what’s on board, Osiris-Rex will still leave the vicinity of the asteroid in March – that’s the earliest possible departure given the relative locations of Earth and Bennu. The samples won’t make it back until 2023, seven years after the spacecraft rocketed away from Cape Canaveral.

    Osiris-Rex will keep drifting away from Bennu and will not orbit it again, as it waits for its scheduled departure.

    Because of the sudden turn of events, scientists won’t know how much the sample capsule holds until it’s back on Earth. They initially planned to spin the spacecraft to measure the contents, but that manoeuvr was cancelled since it could spill even more debris.

    “I think we’re going to have to wait until we get home to know precisely how much we have,” Lauretta told reporters. “As you can imagine, that’s hard. … But the good news is we see a lot of material.”

    Japan, meanwhile, is awaiting its second batch of samples taken from a different asteroid, due back in December.

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    Two flights into Abbotsford have had recent COVID-19 exposures – Agassiz-Harrison Observer

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    Two flights to Abbotsford have each had a recent COVID-19 exposure, according to the B.C. Centre for Disease Control (CDC).

    The agency indicates on its website that the flights involved were WestJet flight 637 from Calgary to Abbotsford on Wednesday, Oct. 14 (rows nine to 15) and Swoop flight 107 from Hamilton to Abbotsford on Monday, Oct. 19 (rows 20 to 26).

    The CDC advises that anyone who was on these flights should self-monitor for symptoms for 14 days.

    RELATED: Vancouver airport to pilot pre-flight COVID-19 tests for select WestJet passengers

    Passengers on domestic flights are not required to self-isolate, but those who have travelled outside of Canada are required to self-isolate for 14 days upon their arrival.

    Passengers seated on a plane with a case of COVID-19 that was later identified are no longer directly notified of their potential exposure. Instead, anyone who has travelled is asked to monitor the CDC website.

    Passengers seated in the affected rows are considered to be at higher risk of exposure due to their proximity to the case.

    RELATED: WestJet to offer full refunds for flights cancelled due to COVID-19 pandemic



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    Astronaut votes from space – Hindustan Times

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    At least she didn’t have to wait in line. A US astronaut cast her ballot from the International Space Station on Thursday, making her voice heard in the presidential election despite being 408km above the Earth.

    “From the International Space Station: I voted today,” crew member Kate Rubins, who began a six-month stint aboard the orbiting station last week, said on Nasa’s Twitter account.

    The post featured a photo of Rubins, her hair floating in the zero-gravity environment, in front of an enclosure with a sign that reads “ISS voting booth”.

    Rubins and Nasa described the process as a form of absentee voting. A secure electronic ballot generated by a clerk’s office in Harris County, home of Nasa’s Johnson Space Center in Houston, Texas, was sent up via email to the ISS. Rubins filled out the ballot in the email and it was downlinked and delivered back to the clerk’s office.

    Rubins had cast her vote from the ISS during the 2016 election as well. “We consider it an honour to be able to vote from space,” she said in a video before she and two Russian cosmonauts launched from the Baikonur cosmodrome in Kazakhstan on October 14.

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