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

Hierarchical galaxy formation in Hierarchical galaxy formation in CDM cosmology (Credit: MPA)CDM cosmology (Credit: MPA)

Mergers of galaxies & AGNs(see Popovic 2012, NewAR, review paper)

binary AGNs ~ 1.4 kpc

(Komossa et al., 2003)

IMBHs in global clusters?

NGC4472 (Maccorane et al, 2007, Nat)

SMBHBs at Sgr A*? (Hansen & Milosavljevic 2003)

Begelman, Blandford, Rees, 1980, 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.