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Activity of the Group for Astrophysical Spectroscopy GAS Luka Č. Popović Astronomical Observatory, Belgrade, Serbia Four projects financed by Ministry of education and science Pr176001 – Astrophyscal spectroscopy of extragalactic Objects • Edi Bon (PhD 2010) • Miodrag Dacic (until 2011, in pension) • Milan Dimitrijevic (until 2011, now involved in interdisciplinar project, leaded by D. Jevremovic) • Natasa Gavrilovic-Bon (PhD in 2011) • Dragana Ilic • Predrag Jovanovic • Andjelka Kovacevic • Jelena Kovacevic (PhD in 2011) • Luka Popovic • Sasa Simic • Marko Stalevski (PhD student) Pr176001 – Astrophyscal spectroscopy of extragalactic Objects – Participants from another institutions • • • • Evangelia Lyratzy (Greece) Evencio Mediavilla (Spain) Alla I. Shapovalova (Russia) Three EM students working on subjects from the project • Payaswini, Nemanja and Luca Some conferences – 8 SCSLSA Last two years (2010 to 2012) we published 41 papers, 14 in the journals from ISI list • • • • • • 8 SCSLSA in June 2011, Proceedings in Baltic Astronomy, Vol. 20 (Eds. L. C. Popovic, D. Ilic and D. Jevremovic) Workshop on Supermassive Black Hole Binaries – Proc. New Astronomy Reviews, Volume 56, Issue 2 (Ed L. C. Popovic) SPIG 2010 Proc. in Journal of Physics: Conference Series, Volume 257, Issue 1 (Eds. L. C. Popovic and M. Kuraica) Three PhD thesis, Edi, Natasha and Jelena Participation in two COST actions: MP0905 Black Holes in a Violent Unvierse (MC L. Popovic and P. Jovanovic) and MP 1104 Polarization in Astronomy (MC D. Ilic and L. Popovic) Participation in EM master studies in Astrophysics – Astromundus (D. Ilic, L. Popovic) Subjects • Active Galactic Nuclei • Gravitational Lensis • Gamma Ray Bursts АGN AGN Part • Central Part (monitoring program with A.I. Shapovalova – Russia, V. Chavushian – Mexico and W. Kollatschny – Germany) and SDSS spectra. Work of Payaswini and Nemanja • Physics of the BLR (P. Rafanelli and G. La Mura – Italy) • Broad Absorption Lines in AGN (E. Danezis and V. Lyratzi – Greece) • Polarization in the BLR (here to talk with V. Afanasiev Russia) • AGN Torus (part of M. Stalevski PhD, M. Baes – Belgium) • Stellar populations in AGNs (Natasha Gavrilovic-Bon, collaboration with Lyon Observatory – France) Disk emission in the optical broad lines – geometry of the BLR – e.g. 3C390.3 • Eracleous & Halpern 1994, 2003, ApJ • Shapovalova, Popovic, Burenkov et al. 2010, A&A • Popovic, Shapovalova, Ilic et al. 2011, A&A • • • • Double peaked lines Very broad Radio loud AGN Variability in line intensities and line shapes (Shapovalova, Popovic et al. 2010, Popovic et al. 2011) • Very small fraction, 3-5%, of BLAGN Gravitational lensing • Obs. 6m telescope SAO (A. Moeseev) Theoretical part E. Mediavilla – Spain Stalevski et al. 2012, Sent to MNRAS Lensing of the torus Gamma ray bursts • Modified Shock wave model (Simic & Popovic 2012, IJMPD) Luca is working on multi-peaked GRB light curves Mergers of galaxies & AGNs (see Popovic 2012, NewAR, review paper) Hierarchical galaxy formation in CDM cosmology (Credit: MPA) Begelman, Blandford, Rees, 1980, Nat binary AGNs ~ 1.4 kpc (Komossa et al., 2003) SMBHBs at Sgr A*? (Hansen & Milosavljevic 2003) IMBHs in global clusters? NGC4472 (Maccorane et al, 2007, Nat) Some interesting profiles We are here to discuss • E.g. Spectral line polarization and binary black holes • UV & Optical spectra AGN • Variabilty of AGNs, monitoring projects • GRBs and high energy emission of AGNs • The structure and physics of the BLR • Etc.