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  1. Article ; Online: Black hole spin-orbit misalignment in the x-ray binary MAXI J1820+070.

    Poutanen, Juri / Veledina, Alexandra / Berdyugin, Andrei V / Berdyugina, Svetlana V / Jermak, Helen / Jonker, Peter G / Kajava, Jari J E / Kosenkov, Ilia A / Kravtsov, Vadim / Piirola, Vilppu / Shrestha, Manisha / Perez Torres, Manuel A P / Tsygankov, Sergey S

    Science (New York, N.Y.)

    2022  Volume 375, Issue 6583, Page(s) 874–876

    Abstract: The observational signatures of black holes in x-ray binary systems depend on their masses, spins, accretion rate, and the misalignment angle between the black hole spin and the orbital angular momentum. We present optical polarimetric observations of ... ...

    Abstract The observational signatures of black holes in x-ray binary systems depend on their masses, spins, accretion rate, and the misalignment angle between the black hole spin and the orbital angular momentum. We present optical polarimetric observations of the black hole x-ray binary MAXI J1820+070, from which we constrain the position angle of the binary orbital. Combining this with previous determinations of the relativistic jet orientation, which traces the black hole spin, and the inclination of the orbit, we determine a lower limit of 40° on the spin-orbit misalignment angle. The misalignment must originate from either the binary evolution or black hole formation stages. If other x-ray binaries have similarly large misalignments, these would bias measurements of black hole masses and spins from x-ray observations.
    Language English
    Publishing date 2022-02-24
    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.abl4679
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Polarized x-rays constrain the disk-jet geometry in the black hole x-ray binary Cygnus X-1.

    Krawczynski, Henric / Muleri, Fabio / Dovčiak, Michal / Veledina, Alexandra / Rodriguez Cavero, Nicole / Svoboda, Jiri / Ingram, Adam / Matt, Giorgio / Garcia, Javier A / Loktev, Vladislav / Negro, Michela / Poutanen, Juri / Kitaguchi, Takao / Podgorný, Jakub / Rankin, John / Zhang, Wenda / Berdyugin, Andrei / Berdyugina, Svetlana V / Bianchi, Stefano /
    Blinov, Dmitry / Capitanio, Fiamma / Di Lalla, Niccolò / Draghis, Paul / Fabiani, Sergio / Kagitani, Masato / Kravtsov, Vadim / Kiehlmann, Sebastian / Latronico, Luca / Lutovinov, Alexander A / Mandarakas, Nikos / Marin, Frédéric / Marinucci, Andrea / Miller, Jon M / Mizuno, Tsunefumi / Molkov, Sergey V / Omodei, Nicola / Petrucci, Pierre-Olivier / Ratheesh, Ajay / Sakanoi, Takeshi / Semena, Andrei N / Skalidis, Raphael / Soffitta, Paolo / Tennant, Allyn F / Thalhammer, Phillipp / Tombesi, Francesco / Weisskopf, Martin C / Wilms, Joern / Zhang, Sixuan / Agudo, Iván / Antonelli, Lucio A / Bachetti, Matteo / Baldini, Luca / Baumgartner, Wayne H / Bellazzini, Ronaldo / Bongiorno, Stephen D / Bonino, Raffaella / Brez, Alessandro / Bucciantini, Niccolò / Castellano, Simone / Cavazzuti, Elisabetta / Ciprini, Stefano / Costa, Enrico / De Rosa, Alessandra / Del Monte, Ettore / Di Gesu, Laura / Di Marco, Alessandro / Donnarumma, Immacolata / Doroshenko, Victor / Ehlert, Steven R / Enoto, Teruaki / Evangelista, Yuri / Ferrazzoli, Riccardo / Gunji, Shuichi / Hayashida, Kiyoshi / Heyl, Jeremy / Iwakiri, Wataru / Jorstad, Svetlana G / Karas, Vladimir / Kolodziejczak, Jeffery J / La Monaca, Fabio / Liodakis, Ioannis / Maldera, Simone / Manfreda, Alberto / Marscher, Alan P / Marshall, Herman L / Mitsuishi, Ikuyuki / Ng, Chi-Yung / O'Dell, Stephen L / Oppedisano, Chiara / Papitto, Alessandro / Pavlov, George G / Peirson, Abel L / Perri, Matteo / Pesce-Rollins, Melissa / Pilia, Maura / Possenti, Andrea / Puccetti, Simonetta / Ramsey, Brian D / Romani, Roger W / Sgrò, Carmelo / Slane, Patrick / Spandre, Gloria / Tamagawa, Toru / Tavecchio, Fabrizio / Taverna, Roberto / Tawara, Yuzuru / Thomas, Nicholas E / Trois, Alessio / Tsygankov, Sergey / Turolla, Roberto / Vink, Jacco / Wu, Kinwah / Xie, Fei / Zane, Silvia

    Science (New York, N.Y.)

    2022  Volume 378, Issue 6620, Page(s) 650–654

    Abstract: A black hole x-ray binary (XRB) system forms when gas is stripped from a normal star and accretes onto a black hole, which heats the gas sufficiently to emit x-rays. We report a polarimetric observation of the XRB Cygnus X-1 using the Imaging X-ray ... ...

    Abstract A black hole x-ray binary (XRB) system forms when gas is stripped from a normal star and accretes onto a black hole, which heats the gas sufficiently to emit x-rays. We report a polarimetric observation of the XRB Cygnus X-1 using the Imaging X-ray Polarimetry Explorer. The electric field position angle aligns with the outflowing jet, indicating that the jet is launched from the inner x-ray-emitting region. The polarization degree is 4.01 ± 0.20% at 2 to 8 kiloelectronvolts, implying that the accretion disk is viewed closer to edge-on than the binary orbit. These observations reveal that hot x-ray-emitting plasma is spatially extended in a plane perpendicular to, not parallel to, the jet axis.
    Language English
    Publishing date 2022-11-03
    Publishing country United States
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 128410-1
    ISSN 1095-9203 ; 0036-8075
    ISSN (online) 1095-9203
    ISSN 0036-8075
    DOI 10.1126/science.add5399
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Polarized blazar X-rays imply particle acceleration in shocks.

    Liodakis, Ioannis / Marscher, Alan P / Agudo, Iván / Berdyugin, Andrei V / Bernardos, Maria I / Bonnoli, Giacomo / Borman, George A / Casadio, Carolina / Casanova, Vı Ctor / Cavazzuti, Elisabetta / Rodriguez Cavero, Nicole / Di Gesu, Laura / Di Lalla, Niccoló / Donnarumma, Immacolata / Ehlert, Steven R / Errando, Manel / Escudero, Juan / Garcı A-Comas, Maya / Agı S-González, Beatriz /
    Husillos, César / Jormanainen, Jenni / Jorstad, Svetlana G / Kagitani, Masato / Kopatskaya, Evgenia N / Kravtsov, Vadim / Krawczynski, Henric / Lindfors, Elina / Larionova, Elena G / Madejski, Grzegorz M / Marin, Frédéric / Marchini, Alessandro / Marshall, Herman L / Morozova, Daria A / Massaro, Francesco / Masiero, Joseph R / Mawet, Dimitri / Middei, Riccardo / Millar-Blanchaer, Maxwell A / Myserlis, Ioannis / Negro, Michela / Nilsson, Kari / O'Dell, Stephen L / Omodei, Nicola / Pacciani, Luigi / Paggi, Alessandro / Panopoulou, Georgia V / Peirson, Abel L / Perri, Matteo / Petrucci, Pierre-Olivier / Poutanen, Juri / Puccetti, Simonetta / Romani, Roger W / Sakanoi, Takeshi / Savchenko, Sergey S / Sota, Alfredo / Tavecchio, Fabrizio / Tinyanont, Samaporn / Vasilyev, Andrey A / Weaver, Zachary R / Zhovtan, Alexey V / Antonelli, Lucio A / Bachetti, Matteo / Baldini, Luca / Baumgartner, Wayne H / Bellazzini, Ronaldo / Bianchi, Stefano / Bongiorno, Stephen D / Bonino, Raffaella / Brez, Alessandro / Bucciantini, Niccoló / Capitanio, Fiamma / Castellano, Simone / Ciprini, Stefano / Costa, Enrico / De Rosa, Alessandra / Del Monte, Ettore / Di Marco, Alessandro / Doroshenko, Victor / Dovčiak, Michal / Enoto, Teruaki / Evangelista, Yuri / Fabiani, Sergio / Ferrazzoli, Riccardo / Garcia, Javier A / Gunji, Shuichi / Hayashida, Kiyoshi / Heyl, Jeremy / Iwakiri, Wataru / Karas, Vladimir / Kitaguchi, Takao / Kolodziejczak, Jeffery J / La Monaca, Fabio / Latronico, Luca / Maldera, Simone / Manfreda, Alberto / Marinucci, Andrea / Matt, Giorgio / Mitsuishi, Ikuyuki / Mizuno, Tsunefumi / Muleri, Fabio / Ng, Stephen C-Y / Oppedisano, Chiara / Papitto, Alessandro / Pavlov, George G / Pesce-Rollins, Melissa / Pilia, Maura / Possenti, Andrea / Ramsey, Brian D / Rankin, John / Ratheesh, Ajay / Sgró, Carmelo / Slane, Patrick / Soffitta, Paolo / Spandre, Gloria / Tamagawa, Toru / Taverna, Roberto / Tawara, Yuzuru / Tennant, Allyn F / Thomas, Nicolas E / Tombesi, Francesco / Trois, Alessio / Tsygankov, Sergey / Turolla, Roberto / Vink, Jacco / Weisskopf, Martin C / Wu, Kinwah / Xie, Fei / Zane, Silvia

    Nature

    2022  Volume 611, Issue 7937, Page(s) 677–681

    Abstract: Most of the light from blazars, active galactic nuclei with jets of magnetized plasma that point nearly along the line of sight, is produced by high-energy particles, up to around 1 TeV. Although the jets are known to be ultimately powered by a ... ...

    Abstract Most of the light from blazars, active galactic nuclei with jets of magnetized plasma that point nearly along the line of sight, is produced by high-energy particles, up to around 1 TeV. Although the jets are known to be ultimately powered by a supermassive black hole, how the particles are accelerated to such high energies has been an unanswered question. The process must be related to the magnetic field, which can be probed by observations of the polarization of light from the jets. Measurements of the radio to optical polarization-the only range available until now-probe extended regions of the jet containing particles that left the acceleration site days to years earlier
    Language English
    Publishing date 2022-11-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/s41586-022-05338-0
    Database MEDical Literature Analysis and Retrieval System OnLINE

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