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Просмотр по теме "Galaxies: active"

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  • 37 GHz observations of narrow-line Seyfert 1 galaxies 
    Lähteenmäki A.; Järvelä E.; Hovatta T.; Tornikoski M.; Harrison D.; López-Caniego M.; Max-Moerbeck W.; Mingaliev M.; Pearson T.; Ramakrishnan V.; Readhead A.; Reeves R.; Richards J.; Sotnikova Y.; Tammi J. (2017)
    © ESO 2017. Observations performed at Metsähovi Radio Observatory at 37 GHz are presented for a sample of 78 radio-loud and radio-quiet narrow-line Seyfert 1 (NLS1) galaxies, together with additional lower and higher ...
  • Circumnuclear regions of different BPT types in star-forming MaNGA galaxies: AGN detectability 
    Pilyugin L.S.; Grebel E.K.; Zinchenko I.A.; Lara-López M.A.; Nefedyev Y.A.; Shulga V.M. (2020)
    © ESO 2020. We consider the circumnuclear regions of star-forming MaNGA galaxies. The spaxels spectra are classified as active-galactic-nucleus-like (AGN-like), H» II-region-like (or SF-like), and intermediate (INT) spectra ...
  • Investigation of the correlation patterns and the Compton dominance variability of Mrk 421 in 2017 
    Acciari V.A.; Ansoldi S.; Antonelli L.A.; Arbet Engels A.; Artero M.; Asano K.; Babić A.; Baquero A.; Barres De Almeida U.; Barrio J.A.; Batković I.; Becerra González J.; Bednarek W.; Bellizzi L.; Bernardini E.; Bernardos M.; Berti A.; Besenrieder J.; Bhattacharyya W.; Bigongiari C.; Blanch O.; Bošnjak A.; Busetto G.; Carosi R.; Ceribella G.; Cerruti M.; Chai Y.; Chilingarian A.; Cikota S.; Colak S.M.; Colombo E.; Contreras J.L.; Cortina J.; Covino S.; D'Amico G.; D'Elia V.; Da Vela P.; Dazzi F.; De Angelis A.; De Lotto B.; Delfino M.; Delgado J.; Delgado Mendez C.; Depaoli D.; Di Pierro F.; Di Venere L.; Do Souto Espiñeira E.; Dominis Prester D.; Donini A.; Doro M.; Fallah Ramazani V.; Fattorini A.; Ferrara G.; Fonseca M.V.; Font L.; Fruck C.; Fukami S.; García López R.J.; Garczarczyk M.; Gasparyan S.; Gaug M.; Giglietto N.; Giordano F.; Gliwny P.; Godinović N.; Green J.G.; Green D.; Hadasch D.; Hahn A.; Heckmann L.; Herrera J.; Hoang J.; Hrupec D.; Hütten M.; Inada T.; Inoue S.; Ishio K.; Iwamura Y.; Jiménez I.; Jormanainen J.; Jouvin L.; Kajiwara Y.; Karjalainen M.; Kerszberg D.; Kobayashi Y.; Kubo H.; Kushida J.; Lamastra A.; Lelas D.; Leone F.; Lindfors E.; Lombardi S.; Longo F.; López-Coto R.; López-Moya M.; López-Oramas A.; Loporchio S.; Machado De Oliveira Fraga B.; Maggio C.; Majumdar P. (2021)
    Aims. We present a detailed characterisation and theoretical interpretation of the broadband emission of the paradigmatic TeV blazar Mrk 421, with a special focus on the multi-band flux correlations. Methods. The dataset ...
  • Long-term multiwavelength studies of high-redshift blazar 0836+710 
    Akyuz A.; Thompson D.; Donato D.; Perkins J.; Fuhrmann L.; Angelakis E.; Zensus J.; Larsson S.; Sokolovsky K.; Kurtanidze O. (2013)
    Aims. The observation of γ-ray flares from blazar 0836+710 in 2011, following a period of quiescence, offered an opportunity to study correlated activity at different wavelengths for a high-redshift (z = 2.218) active ...
  • MAGIC gamma-ray and multi-frequency observations of flat spectrum radio quasar PKS 1510-089 in early 2012 
    Aleksić J.; Ansoldi S.; Antonelli L.; Antoranz P.; Babic A.; Bangale P.; Barres De Almeida U.; Barrio J.; Becerra González J.; Bednarek W.; Bernardini E.; Biland A.; Blanch O.; Bonnefoy S.; Bonnoli G.; Borracci F.; Bretz T.; Carmona E.; Carosi A.; Carreto Fidalgo D.; Colin P.; Colombo E.; Contreras J.; Cortina J.; Covino S.; Da Vela P.; Dazzi F.; De Angelis A.; De Caneva G.; De Lotto B.; Delgado Mendez C.; Doert M.; Domínguez A.; Dominis Prester D.; Dorner D.; Doro M.; Einecke S.; Eisenacher D.; Elsaesser D.; Farina E.; Ferenc D.; Fonseca M.; Font L.; Frantzen K.; Fruck C.; García López R.; Garczarczyk M.; Garrido Terrats D.; Gaug M.; Godinović N.; González Muñoz A.; Gozzini S.; Hadasch D.; Hayashida M.; Herrera J.; Herrero A.; Hildebrand D.; Hose J.; Hrupec D.; Idec W.; Kadenius V.; Kellermann H.; Kodani K.; Konno Y.; Krause J.; Kubo H.; Kushida J.; La Barbera A.; Lelas D.; Lewandowska N.; Lindfors E.; Lombardi S.; López M.; López-Coto R.; López-Oramas A.; Lorenz E.; Lozano I.; Makariev M.; Mallot K.; Maneva G.; Mankuzhiyil N.; Mannheim K.; Maraschi L.; Marcote B.; Mariotti M.; Martínez M.; Mazin D.; Menzel U.; Meucci M.; Miranda J.; Mirzoyan R.; Moralejo A.; Munar-Adrover P.; Nakajima D.; Niedzwiecki A.; Nilsson K. (2014)
    © 2014 ESO. Aims. Amongst more than fifty blazars detected in very high energy (VHE, E> 100 GeV) γ rays, only three belong to the subclass of flat spectrum radio quasars (FSRQs). The detection of FSRQs in the VHE range is ...
  • Multiband optical variability of the blazar OJ 287 during its outbursts in 2015-2016 
    Gupta A.; Agarwal A.; Mishra A.; Gaur H.; Wiita P.; Gu M.; Kurtanidze O.; Damljanovic G.; Uemura M.; Semkov E.; Strigachev A.; Bachev R.; Vince O.; Zhang Z.; Villarroel B.; Kushwaha P.; Pandey A.; Abe T.; Chanishvili R.; Chigladze R.; Fan J.; Hirochi J.; Itoh R.; Kanda Y.; Kawabata M.; Kimeridze G.; Kurtanidze S.; Latev G.; Muñoz Dimitrova R.; Nakaoka T.; Nikolashvili M.; Shiki K.; Sigua L.; Spassov B. (2017)
    © 2016 The Authors.We present recent optical photometric observations of the blazar OJ 287 taken during 2015 September-2016 May. Our intense observations of the blazar started in 2015 November and continued until 2016 May ...
  • Multifrequency studies of the peculiar QUASAR 4C +21.35 during the 2010 flaring activity 
    Ackermann M.; Ajello M.; Allafort A.; Antolini E.; Barbiellini G.; Bastieri D.; Bellazzini R.; Bissaldi E.; Bonamente E.; Bregeon J.; Brigida M.; Bruel P.; Buehler R.; Buson S.; Caliandro G.; Cameron R.; Caraveo P.; Cavazzuti E.; Cecchi C.; Chaves R.; Chekhtman A.; Chiang J.; Chiaro G.; Ciprini S.; Claus R.; Cohen-Tanugi J.; Conrad J.; Cutini S.; D'Ammando F.; De Palma F.; Dermer C.; Do Couto E Silva E.; Donato D.; Drell P.; Favuzzi C.; Finke J.; Focke W.; Franckowiak A.; Fukazawa Y.; Fusco P.; Gargano F.; Gasparrini D.; Gehrels N.; Giglietto N.; Giordano F.; Giroletti M.; Godfrey G.; Grenier I.; Guiriec S.; Hayashida M.; Hewitt J.; Horan D.; Hughes R.; Iafrate G.; Johnson A.; Knödlseder J.; Kuss M.; Lande J.; Larsson S.; Latronico L.; Longo F.; Loparco F.; Lovellette M.; Lubrano P.; Mayer M.; Mazziotta M.; McEnery J.; Michelson P.; Mizuno T.; Monzani M.; Morselli A.; Moskalenko I.; Murgia S. (2014)
    © 2014. The American Astronomical Society. All rights reserved. Printed in the U.S.A. The discovery of rapidly variable Very High Energy (VHE; E > 100 GeV) γ -ray emission from 4C +21.35 (PKS 1222+216) by MAGIC on 2010 ...
  • Multifrequency study of GHz-peaked spectrum sources and candidates with the RATAN-600 radio telescope 
    Mingaliev M.; Sotnikova Y.; Torniainen I.; Tornikoski M.; Udovitskiy R. (2012)
    Context. Gigahertz peaked spectrum (GPS) radio sources are a class of extragalactic radio sources characterized by a spectral peak in the gigahertz domain. They are a mixed class of quasars and galaxies. A large proportion ...
  • Multiwavelength behaviour of the blazar OJ 248 from radio to γ -rays 
    Carnerero M.; Raiteri C.; Villata M.; Acosta-Pulido J.; D'Ammando F.; Smith P.; Larionov V.; Agudo I.; Arévalo M.; Arkharov A.; Bach U.; Bachev R.; Benítez E.; Blinov D.; Bozhilov V.; Buemi C.; Bueno Bueno A.; Carosati D.; Casadio C.; Chen W.; Damljanovic G.; Di Paola A.; Efimova N.; Ehgamberdiev S.; Giroletti M.; Gómez J.; González-Morales P.; Grinon-Marin A.; Grishina T.; Gurwell M.; Hiriart D.; Hsiao H.; Ibryamov S.; Jorstad S.; Joshi M.; Kopatskaya E.; Kurtanidze O.; Kurtanidze S.; Lähteenmäki A.; Larionova E.; Larionova L.; Lázaro C.; Leto P.; Lin C.; Lin H.; Manilla-Robles A.; Marscher A.; McHardy I.; Metodieva Y.; Mirzaqulov D.; Mokrushina A.; Molina S.; Morozova D.; Nikolashvili M.; Orienti M.; Ovcharov E.; Panwar N.; Pastor Yabar A.; Puerto Giménez I.; Ramakrishnan V.; Richter G.; Rossini M.; Sigua L.; Strigachev A.; Taylor B.; Tornikoski M.; Trigilio C.; Troitskaya Y.; Troitsky I.; Umana G.; Valcheva A.; Velasco S.; Vince O.; Wehrle A.; Wiesemeyer H. (2015)
    © 2015 The Authors. We present an analysis of the multiwavelength behaviour of the blazar OJ 248 at z = 0.939 in the period 2006-2013. We use low-energy data (optical, near-infrared, and radio) obtained by 21 observatories ...
  • Multiwavelength temporal and spectral variability of the blazar OJ 287 during and after the 2015 December flare: A major accretion disc contribution 
    Hirochi J.; Itoh R.; Kawabata M.; Kopatskaya E.; Kurtanidze S.; Larionova E.; Larionova L.; Mishra A.; Morozova D.; Nakaoka T.; Nikolashvili M.; Savchenko S.; Troitskaya Y.; Troitsky I.; Vasilyev A. (2018)
    © 2018 The Author(s). We present a multiwavelength spectral and temporal analysis of the blazar OJ 287 during its recent activity between 2015 December and 2016 May, showing strong variability in the nearinfrared (NIR) to ...
  • Optical and radio variability of BL Lacertae 
    Gaur H.; Gupta A.; Bachev R.; Strigachev A.; Semkov E.; Wiita P.; Volvach A.; Gu M.; Agarwal A.; Agudo I.; Aller M.; Aller H.; Kurtanidze O.; Kurtanidze S.; Lähteenmäki A.; Peneva S.; Nikolashvili M.; Sigua L.; Tornikoski M.; Volvach L. (2015)
    © ESO, 2015. Context. We extensively observed the prototype blazar, BL Lacertae, in optical and radio bands during an active phase in the period 2010-2013 when the source showed several prominent outbursts. We searched for ...
  • Planck intermediate results: XLV. Radio spectra of northern extragalactic radio sources 
    Ade P.; Aghanim N.; Aller H.; Aller M.; Arnaud M.; Aumont J.; Baccigalupi C.; Banday A.; Barreiro R.; Bartolo N.; Battaner E.; Benabed K.; Benoit-Lévy A.; Bernard J.; Bersanelli M.; Bielewicz P.; Bonaldi A.; Bonavera L.; Bond J.; Borrill J.; Bouchet F.; Burigana C.; Calabrese E.; Catalano A.; Chiang H.; Christensen P.; Clements D.; Colombo L.; Couchot F.; Crill B.; Curto A.; Cuttaia F.; Danese L.; Davies R.; Davis R.; De Bernardis P.; De Rosa A.; De Zotti G.; Delabrouille J.; Dickinson C.; Diego J.; Dole H.; Donzelli S.; Doré O.; Ducout A.; Dupac X.; Efstathiou G.; Elsner F.; Eriksen H.; Finelli F.; Forni O.; Frailis M.; Fraisse A.; Franceschi E.; Galeotta S.; Galli S.; Ganga K.; Giard M.; Giraud-Héraud Y.; Gjerløw E.; González-Nuevo J.; Górski K.; Gruppuso A.; Gurwell M.; Hansen F.; Harrison D.; Henrot-Versillé S. (2016)
    © ESO, 2016.Continuum spectra covering centimetre to submillimetre wavelengths are presented for a northern sample of 104 extragalactic radio sources, mainly active galactic nuclei, based on four-epoch Planck data. The ...
  • Polarization and spectral energy distribution in OJ 287 during the 2016/17 outbursts 
    Valtonen M.; Zola S.; Jermak H.; Ciprini S.; Hudec R.; Dey L.; Gopakumar A.; Reichart D.; Caton D.; Gazeas K.; Matsumoto K.; Ogloza W.; Drozdz M.; Alicavus F.; Baransky O.; Berdyugin A.; Boumis P.; Bufan Y.; Debski B.; Er H.; Erdem A.; Godunova V.; Haque S.; Hoette V.; Janik J.; Kidger M.; Kundera T.; Kurowski S.; Liakos A.; Mohammed I.; Nilsson K.; Pajdosz U.; Piirola V.; Pursimo T.; Rajkumar B.; Simon A.; Siwak M.; Sonbas E.; Steele I.; Vasylenko V.; Zejmo M.; Zielinski P. (2017)
    © 2017 by the authors. We report optical photometric and polarimetric observations of the blazar OJ 287 gathered during 2016/17. The high level of activity, noticed after the General Relativity Centenary flare, is argued ...
  • Polarization angle swings in blazars: The case of 3C 279 
    Kiehlmann S.; Savolainen T.; Jorstad S.; Sokolovsky K.; Schinzel F.; Marscher A.; Larionov V.; Agudo I.; Akitaya H.; Benítez E.; Berdyugin A.; Blinov D.; Bochkarev N.; Borman G.; Burenkov A.; Casadio C.; Doroshenko V.; Efimova N.; Fukazawa Y.; Gómez J.; Grishina T.; Hagen-Thorn V.; Heidt J.; Hiriart D.; Itoh R.; Joshi M.; Kawabata K.; Kimeridze G.; Kopatskaya E.; Korobtsev I.; Krajci T.; Kurtanidze O.; Kurtanidze S.; Larionova E.; Larionova L.; Lindfors E.; López J.; McHardy I.; Molina S.; Moritani Y.; Morozova D.; Nazarov S.; Nikolashvili M.; Nilsson K.; Pulatova N.; Reinthal R.; Sadun A.; Sasada M.; Savchenko S.; Sergeev S.; Sigua L.; Smith P.; Sorcia M.; Spiridonova O.; Takaki K.; Takalo L.; Taylor B.; Troitsky I.; Uemura M.; Ugolkova L.; Ui T.; Yoshida M.; Zensus J.; Zhdanova V. (2016)
    © ESO, 2016.Context. Over the past few years, on several occasions, large, continuous rotations of the electric vector position angle (EVPA) of linearly polarized optical emission from blazars have been reported. These ...
  • Probing large-scale structure with large samples of X-ray selected AGN: I. Baryonic acoustic oscillations 
    Hütsi G.; Gilfanov M.; Kolodzig A.; Sunyaev R. (2014)
    © ESO, 2014. We investigate the potential of large X-ray-selected AGN samples for detecting baryonic acoustic oscillations (BAO). Though AGN selection in X-ray band is very clean and efficient, it does not provide redshift ...
  • SRG/eROSITA uncovers the most X-ray luminous quasar at z > 6 
    Medvedev P.; Sazonov S.; Gilfanov M.; Burenin R.; Khorunzhev G.; Meshcheryakov A.; Sunyaev R.; Bikmaev I.; Irtuganov E. (2020)
    © 2020 The Author(s). We report the discovery of X-ray emission from CFHQS J142952+544717, the most distant known radio-loud quasar at z = 6.18, on 2019 December 10-11 with the eROSITA telescope on board the SRG satellite ...
  • Synchrotron emission from the blazar PG 1553+113. An analysis of its flux and polarization variability 
    Raiteri C.; Nicastro F.; Stamerra A.; Villata M.; Larionov V.; Blinov D.; Acosta-Pulido J.; Arévalo M.; Arkharov A.; Bachev R.; Borman G.; Carnerero M.; Carosati D.; Cecconi M.; Chen W.; Damljanovic G.; Di Paola A.; Ehgamberdiev S.; Frasca A.; Giroletti M.; González-Morales P.; Griñon-Marín A.; Grishina T.; Huang P.; Ibryamov S.; Klimanov S.; Kopatskaya E.; Kurtanidze O.; Kurtanidze S.; Lähteenmäki A.; Larionova E.; Larionova L.; Lázaro C.; Leto G.; Liodakis I.; Martínez-Lombilla C.; Mihov B.; Mirzaqulov D.; Mokrushina A.; Moody J.; Morozova D.; Nazarov S.; Nikolashvili M.; Ohlert J.; Panopoulou G.; Pastor Yabar A.; Pinna F.; Protasio C.; Rizzi N.; Sadun A.; Savchenko S.; Semkov E.; Sigua L.; Slavcheva-Mihova L.; Strigachev A.; Tornikoski M.; Troitskaya Y.; Troitsky I.; Vasilyev A.; Vera R.; Vince O.; Zanmar Sanchez R. (2017)
    © 2016 The Authors.In 2015 July 29-September 1, the satellite XMM-Newton pointed at the BL Lac object PG 1553+133 six times, collecting data for 218 h. During one of these epochs, simultaneous observations by the Swift ...
  • The complex variability of blazars: Time-scales and periodicity analysis in S4 0954+65 
    Raiteri C.M.; Villata M.; Larionov V.M.; Jorstad S.G.; Marscher A.P.; Weaver Z.R.; Acosta-Pulido J.A.; Agudo I.; Andreeva T.; Arkharov A.; Bachev R.; Benítez E.; Berton M.; Björklund I.; Borman G.A.; Bozhilov V.; Carnerero M.I.; Carosati D.; Casadio C.; Chen W.P.; Damljanovic G.; D'Ammando F.; Escudero J.; Fuentes A.; Giroletti M.; Grishina T.S.; Gupta A.C.; Hagen-Thorn V.A.; Hart M.; Hiriart D.; Hou W.J.; Ivanov D.; Kim J.Y.; Kimeridze G.N.; Konstantopoulou C.; Kopatskaya E.N.; Kurtanidze O.M.; Kurtanidze S.O.; Lähteenmäki A.; Larionova E.G.; Larionova L.V.; Marchili N.; Markovic G.; Minev M.; Morozova D.A.; Myserlis I.; Nakamura M.; Nikiforova A.A.; Nikolashvili M.G.; Otero-Santos J.; Ovcharov E.; Pursimo T.; Rahimov I.; Righini S.; Sakamoto T.; Savchenko S.S.; Semkov E.H.; Shakhovskoy D.; Sigua L.A.; Stojanovic M.; Strigachev A.; Thum C.; Tornikoski M.; Traianou E.; Troitskaya Y.V.; Troitskiy I.S.; Tsai A.; Valcheva A.; Vasilyev A.A.; Vince O.; Zaharieva E. (2021)
    Among active galactic nuclei, blazars show extreme variability properties. We here investigate the case of the BL Lac object S4 0954+65 with data acquired in 2019-2020 by the Transiting Exoplanet Survey Satellite (TESS) ...
  • The ever-surprising blazar OJ 287: Multiwavelength study and appearance of a new component in X-rays 
    Kushwaha P.; Gupta A.; Wiita P.; Pal M.; Gaur H.; Dal Pino E.; Kurtanidze O.; Semkov E.; Damljanovic G.; Hu S.; Uemura M.; Vince O.; Darriba A.; Gu M.; Bachev R.; Chen X.; Itoh R.; Kawabata M.; Kurtanidze S.; Nakaoka T.; Nikolashvili M.; Sigua L.; Strigachev A.; Zhang Z. (2018)
    © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. We present a multiwavelength spectral and temporal investigation of OJ 287 emission during its strong optical-to-X-ray ...
  • The observed radio/gamma-ray emission correlation for blazars with the Fermi-LAT and the RATAN-600 data 
    Mufakharov T.; Mingaliev M.; Sotnikova Y.; Naiden Y.; Erkenov A. (2015)
    © 2015 The Authors. We study the correlation between gamma-ray and radio band radiation for 123 blazars, using the Fermi-LAT first source catalogue (1FGL) and the RATAN-600 data obtained at the same period of time (within ...

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