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  1. Article ; Online: An origin scenario for a fast radio burst.

    Paragi, Zsolt

    Science (New York, N.Y.)

    2023  Volume 380, Issue 6645, Page(s) 580

    Abstract: Never-before-observed behavior of a repeating burst suggests its possible origin. ...

    Abstract Never-before-observed behavior of a repeating burst suggests its possible origin.
    Language English
    Publishing date 2023-05-11
    Publishing country United States
    Document type Journal Article
    ZDB-ID 128410-1
    ISSN 1095-9203 ; 0036-8075
    ISSN (online) 1095-9203
    ISSN 0036-8075
    DOI 10.1126/science.adh8099
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Evolving parsec-scale radio structure in the most distant blazar known.

    An, Tao / Mohan, Prashanth / Zhang, Yingkang / Frey, Sándor / Yang, Jun / Gabányi, Krisztina É / Gurvits, Leonid I / Paragi, Zsolt / Perger, Krisztina / Zheng, Zhenya

    Nature communications

    2020  Volume 11, Issue 1, Page(s) 143

    Abstract: Blazars are a sub-class of quasars with Doppler boosted jets oriented close to the line of sight, and thus efficient probes of supermassive black hole growth and their environment, especially at high redshifts. Here we report on Very Long Baseline ... ...

    Abstract Blazars are a sub-class of quasars with Doppler boosted jets oriented close to the line of sight, and thus efficient probes of supermassive black hole growth and their environment, especially at high redshifts. Here we report on Very Long Baseline Interferometry observations of a blazar J0906 + 6930 at z = 5.47, which enabled the detection of polarised emission and measurement of jet proper motion at parsec scales. The observations suggest a less powerful jet compared with the general blazar population, including lower proper motion and bulk Lorentz factor. This coupled with a previously inferred high accretion rate indicate a transition from an accretion radiative power to a jet mechanical power based transfer of energy and momentum to the surrounding gas. While alternative scenarios could not be fully ruled out, our results indicate a possibly nascent jet embedded in and interacting with a dense medium resulting in a jet bending.
    Language English
    Publishing date 2020-01-09
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-019-14093-2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Radio jets clearing the way through a galaxy: watching feedback in action.

    Morganti, Raffaella / Fogasy, Judit / Paragi, Zsolt / Oosterloo, Tom / Orienti, Monica

    Science (New York, N.Y.)

    2013  Volume 341, Issue 6150, Page(s) 1082–1085

    Abstract: The energy released by an active galactic nucleus (AGN) has a strong impact on the surrounding interstellar medium (ISM). This feedback is considered to be the regulating factor for the growth of the central massive black hole and for the rate of star ... ...

    Abstract The energy released by an active galactic nucleus (AGN) has a strong impact on the surrounding interstellar medium (ISM). This feedback is considered to be the regulating factor for the growth of the central massive black hole and for the rate of star formation in a galaxy. We have located, using very-long-baseline interferometry, the fast outflow of neutral hydrogen in the young, restarted radio-loud AGN 4C12.50. The outflow is located 100 parsec from the nucleus where the radio jet interacts with the ISM, as well as around the associated radio lobe. These observations show that the radio plasma drives the outflow and removes gas from the central regions and that jet-driven outflows can play a relevant role in feedback mechanisms.
    Language English
    Publishing date 2013-09-06
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 128410-1
    ISSN 1095-9203 ; 0036-8075
    ISSN (online) 1095-9203
    ISSN 0036-8075
    DOI 10.1126/science.1240436
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Book ; Online: Commensal, Multi-user Observations with an Ethernet-based Jansky Very Large Array

    Hickish, Jack / Beasley, Tony / Bower, Geoff / Burke-Spolaor, Sarah / Croft, Steve / DeBoer, Dave / Demorest, Paul / Diamond, Bill / Gajjar, Vishal / Law, Casey / Lazio, Joseph / Manley, Jason / Paragi, Zsolt / Ransom, Scott / Siemion, Andrew

    2019  

    Abstract: Over the last decade, the continuing decline in the cost of digital computing technology has brought about a dramatic transformation in how digital instrumentation for radio astronomy is developed and operated. In most cases, it is now possible to ... ...

    Abstract Over the last decade, the continuing decline in the cost of digital computing technology has brought about a dramatic transformation in how digital instrumentation for radio astronomy is developed and operated. In most cases, it is now possible to interface consumer computing hardware, e.g. inexpensive graphics processing units and storage devices, directly to the raw data streams produced by radio telescopes. Such systems bring with them myriad benefits: straightforward upgrade paths, cost savings through leveraging an economy of scale, and a lowered barrier to entry for scientists and engineers seeking to add new instrument capabilities. Additionally, the typical data-interconnect technology used with general-purpose computing hardware -- Ethernet -- naturally permits multiple subscribers to a single raw data stream. This allows multiple science programs to be conducted in parallel. When combined with broad bandwidths and wide primary fields of view, radio telescopes become capable of achieving many science goals simultaneously. Moreover, because many science programs are not strongly dependent on observing cadence and direction (e.g. searches for extraterrestrial intelligence and radio transient surveys), these so-called "commensal" observing programs can dramatically increase the scientific productivity and discovery potential of an observatory. In this whitepaper, we detail a project to add an Ethernet-based commensal observing mode to the Jansky Very Large Array (VLA), and discuss how this mode could be leveraged to conduct a powerful program to constrain the distribution of advanced life in the universe through a search for radio emission indicative of technology. We also discuss other potential science use-cases for the system, and how the system could be used for technology development towards next-generation processing systems for the Next Generation VLA.

    Comment: Astro2020 APC White Paper
    Keywords Astrophysics - Instrumentation and Methods for Astrophysics
    Subject code 303
    Publishing date 2019-07-11
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Binary orbits as the driver of γ-ray emission and mass ejection in classical novae.

    Chomiuk, Laura / Linford, Justin D / Yang, Jun / O'Brien, T J / Paragi, Zsolt / Mioduszewski, Amy J / Beswick, R J / Cheung, C C / Mukai, Koji / Nelson, Thomas / Ribeiro, Valério A R M / Rupen, Michael P / Sokoloski, J L / Weston, Jennifer / Zheng, Yong / Bode, Michael F / Eyres, Stewart / Roy, Nirupam / Taylor, Gregory B

    Nature

    2014  Volume 514, Issue 7522, Page(s) 339–342

    Abstract: Classical novae are the most common astrophysical thermonuclear explosions, occurring on the surfaces of white dwarf stars accreting gas from companions in binary star systems. Novae typically expel about 10(-4) solar masses of material at velocities ... ...

    Abstract Classical novae are the most common astrophysical thermonuclear explosions, occurring on the surfaces of white dwarf stars accreting gas from companions in binary star systems. Novae typically expel about 10(-4) solar masses of material at velocities exceeding 1,000 kilometres per second. However, the mechanism of mass ejection in novae is poorly understood, and could be dominated by the impulsive flash of thermonuclear energy, prolonged optically thick winds or binary interaction with the nova envelope. Classical novae are now routinely detected at gigaelectronvolt γ-ray wavelengths, suggesting that relativistic particles are accelerated by strong shocks in the ejecta. Here we report high-resolution radio imaging of the γ-ray-emitting nova V959 Mon. We find that its ejecta were shaped by the motion of the binary system: some gas was expelled rapidly along the poles as a wind from the white dwarf, while denser material drifted out along the equatorial plane, propelled by orbital motion. At the interface between the equatorial and polar regions, we observe synchrotron emission indicative of shocks and relativistic particle acceleration, thereby pinpointing the location of γ-ray production. Binary shaping of the nova ejecta and associated internal shocks are expected to be widespread among novae, explaining why many novae are γ-ray emitters.
    Language English
    Publishing date 2014-10-08
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/nature13773
    Database MEDical Literature Analysis and Retrieval System OnLINE

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