Progetto AGN – Nuclei Galattici Attivi

Il Progetto Nuclei galattici attivi prevede la misura dell’emissione luminosa delle regioni centrali (nuclei) di particolari galassie lontane miliardi di anni luce, per cercare di determinarne le proprietà fisiche e in particolare le modalità di produzione dell’energia. 

Lo studio dei nuclei galattici attivi (Active Galactic Nuclei, in breve AGN) fornisce importanti contributi ai modelli cosmologici che cercano di spiegare l’evoluzione dell’universo. Secondo il modello maggiormente condiviso degli AGN, l’energia che li alimenta è generata dalla materia che cade all’interno di un buco nero supermassiccio di massa compresa tra 1 milione e 10 miliardi di volte quella del Sole.

Il coinvolgimento dell’OAVdA è iniziato anni fa nell’ambito del consorzio internazionale Whole Earth Blazar Telescope (WEBT), gestito da INAF-OATo e comprendente oltre 40 centri di ricerca in tutto il mondo. Temporaneamente sospeso alla fine del 2013, a causa dell’importante impegno in termini di personale, conoscenza e tempo richiesto dal Progetto Pianeti extrasolari, durante l’estate 2016 ha ripreso la sua attività e dal 2017 anche con l’osservazione di galassie Narrow-Line Seyfert 1. Pochi mesi dopo i ricercatori a Saint-Barthélemy sono stati protagonisti di un’osservazione storica: il picco di emissione della galassia CTA102, registrato con il Telescopio Principale dell’OAVdA, è risultato essere il più luminoso fino a quel momento per questo genere di oggetti celesti. Inoltre è stato registrato solo a Saint-Barthélemy!

 

RESEARCH PROJECT: ACTIVE GALACTIC NUCLEI

(responsible: dr. Paolo Calcidese)

Papers on scientific journals:

  • Ahnen, M. L.; Ansoldi, S.; Antonelli, L. A et al. (including Calcidese P.), “Multiband variability studies and novel broadband SED modeling of Mrk 501 in 2009”, Astronomy & Astrophysics, Volume 603, id.A31, 30 pp, (07/2017).
  • Raiteri, C. M.; Stamerra, A.; Villata M. et al. (including Calcidese P.) “The WEBT campaign on the BL Lac object PG 1553+113 in 2013. An analysis of the enigmatic synchrotron emission”, Monthly Notices of the Royal Astronomical Society, Volume 454, Issue 1, p.353-367 (11/2015).
  • Bhatta G., Webb J. R. et al. (including Calcidese P.) “The 72-Hour WEBT Microvariability Observation of Blazar S5 0716+714 in 2009″, Astronomy & Astrophysics, Volume 558, id.A92, 10 pp. (October 2013).
  • Raiteri C.M., Villata M. et al. (including Calcidese P.) “The Long–lasting activity of 3C 454.3 GASP-WEBT and satellite observations in 2008-2010”, Astronomy & Astrophysics, Vol. 534, id.A87, 16 pp (October 2011).
  • Abdo A.A., Ackermann M. et al. (including Calcidese P.) “Insights into the High-energy ?-ray Emission of Markarian 501 from Extensive Multifrequency Observations in the Fermi Era”, The Astrophysical Journal, Vol. 727, Issue 2, id. 129 (February 2011).
  • Abdo A.A., Ackermann M. et al. (including Calcidese P.) “Multi-wavelength Observations of the Flaring Gamma-ray Blazar 3C 66A in 2008 October”, The Astrophysical Journal, Vol. 726, Issue 1, id. 43 (January 2011).
  • Raiteri C.M., Villata M. et al. (including Calcidese P.) “Another look at the BL Lacertae flux and spectral variability. Observations by GASP-WEBT, XMM-Newton, and Swift in 2008-2009”, Astronomy & Astrophysics, Vol. 524, id. A43 (December 2010)
  • Vercellone, S.; D’Ammando, F.; Vittorini, V. et al. (including Calcidese P.) “Multiwavelength Observations of 3C 454.3. III. Eighteen Months of Agile Monitoring of the “Crazy Diamond”,The Astrophysical Journal, Volume 712, Issue 1, pp. 405-420 (2010)
    ADS: http://adsabs.harvard.edu/abs/2009arXiv0909.1701R
  • Raiteri C. M., Villata M., Capetti A., Aller M. F. et al. (including Calcidese P.) “WEBT multiwavelength monitoring and XMM-Newton observations of BL Lacertae in 2007-2008. Unveiling different emission components”, Astronomy and Astrophysics, Volume 507, Issue 2, pp. 769-779 (november 2009).
    ADS: http://adsabs.harvard.edu/abs/2009arXiv0909.1701R
  • Villata M., Raiteri C. M., Gurwell M.A., Larionov V. M. et al. (including Calcidese P.) “The GASP-WEBT monitoring of 3C 454.3 during the 2008 optical-to-radio and gamma-ray outburst” Astronomy and Astrophysics, Volume 504, Issue 3, pp. L9-L12 (September 2009).
    ADS: http://adsabs.harvard.edu/abs/2009A%26A…504L…9V
  • Böttcher M., Fultz K., Aller H.D., Aller M.F. et al. (including Calcidese P.) “The Whole Earth Blazar Telescope Campaign on the Intermediate BL Lac Object 3C 66A in 2007-2008” The Astrophysical Journal, Volume 694, Issue 1, pp. 174-182 (March 2009).
    ADS: http://adsabs.harvard.edu/abs/2009ApJ…694..174B
  • Raiteri C. M., Villata M. et al. (including Calcidese P. ) “Results of WEBT, VLBA and RXTE monitoring of 3C 279 during 2006-2007” Astronomy and Astrophysics , Volume 492, Issue 2, pp.389-400 (2008).
    ADS: http://adsabs.harvard.edu/abs/2008A%26A…492..389L
  • Raiteri C. M., Villata M. et al. (including Calcidese P. ) “A new activity phase of the blazar 3C 454.3. Multifrequency observations by the WEBT and XMM-Newton in 2007-2008” Astronomy and Astrophysics , Volume 491, Issue 3, pp.755-766 (2008).
    ADS: http://adsabs.harvard.edu/abs/2008A%26A…491..755R
  • Raiteri C. M., Villata M. et al. (including Calcidese P.) “The high activity of 3C 454.3 in autumn 2007. Monitoring by the WEBT during the AGILE detection”, Astronomy & Astrophysics, Volume 485, Issue 2, pp. L17-L20 (July 2008).
    ADS: http://adsabs.harvard.edu/abs/2008A%26A…485L..17R
  • Villata M., Raiteri C. M. et al. (including Calcidese P.) “Multifrequency monitoring of the blazar 0716+714 during the GASP-WEBT-AGILE campaign of 2007”, Astronomy & Astrophysics, Volume 481, Issue 2, pp. L79-L82 (April 2008).
    ADS: http://adsabs.harvard.edu/abs/2008A%26A…481L..79V
  • Raiteri C. M., Villata M. et al. (including Calcidese P.) “Radio-to-UV monitoring of AO 0235+164 by the WEBT and Swift during the 2006-2007 outburst”, Astronomy & Astrophysics, Volume 480, Issue 2, pp. 339-347 (March 2008).
    ADS: http://adsabs.harvard.edu/abs/2008A%26A…480..339R 2
  • Raiteri C. M., Villata M. et al. (including Calcidese P.) “WEBT and XMM-Newton observations of 3C 454.3 during the post-outburst phase. Detection of the little and big blue bumps”, Astronomy & Astrophysics, Volume 473, Issue 3, pp. 819-827 (October 2007).
    ADS: http://adsabs.harvard.edu/abs/2007A%26A…473..819R

The Astronomer’s Telegram Publications (ATEL):

  • Berton, M.; Calcidese, P.; Chen, S.; Congiu, E. “Optical follow-up of the gamma-ray flare from the FSRQ 3C 345”, The Astronomer’s Telegram, No. 10456, publication date: 06/2017.
  • Calcidese, P.; Raiteri, C. M.; Villata, M.; Carnerero, M. I.; Acosta-Pulido, J. A.; GASP-WEBT Collaboration, “CTA 102 brightens up to the most luminous optical blazar state ever detected”, The Astronomer’s Telegram, No. 9868, publication date: 12/2016.
  • Calcidese, P.; Carbognani, A.; Raiteri, C. M.; Villata, M.; Carnerero, M. I.; Acosta-Pulido, J. A.; Protasio, C.; Rodriguez-Coira, G.; GASP-WEBT Collaboration, “Exceptional activity of the blazar CTA 102 (2230+114) observed by the GASP-WEBT”, The Astronomer’s Telegram, No. 9821,  publication date: 12/2016.
  •  Villata M., Raiteri C. M. et al. (including Calcidese P.) “GASP detection of a bright optical flare and mm-cm activity from the blazar 3C 454.3”, The Astronomer’s Telegram, No. 1625, publication date: 07/2008.

Contributions to scientific conferences

• Raiteri C. M., Villata M. et al. (including Calcidese P. ) “Multiwavelength monitoring of 3C 454.3 by the Whole Earth Blazar Telescope”, scientific poster accepted for the conference Active Galactic Nuclei 8. “Quattordici anni dopo…” , Turin, 19-22 May 2008.
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