Archivi tag: active galactic nuclei

Black Hole (g)Astronomy: exploring the different flavors of accretion

The greatest challenge in black hole astrophysics lies in the attempt to unify Galactic, intermediate and supermassive black holes under the same physical scheme to gain a more profound understanding of different classes of objects. In such grand-unification models, the observed behaviours and manifestations of accreting black holes are driven by only a few fundamental parameters, such as mass, accretion rate and spin. The conference tackles the issues related to accretion physics, production of jets/winds/outflows and their time evolution by putting a particular emphasis on the role of the net accretion rate onto black holes of all sizes. We are going to explore to which extent grand-unification schemes of black hole accretion are possible and also where they possibly fail. Participants are encouraged to present theoretical and/or observational results and prospects, across the entire electromagnetic spectrum, and to discuss them in the light of grand-unification paradigms of black hole accretion.

Topics suggested for the conference :

  • Accretion / ejection flows around black holes: theory and observational predictions
  • Disks, winds and jets at different accretion rates: observations and phenomenology
  • XRBs and AGN grand-unification and scaling relations – what do they mean and where do they fail?
  • Ultraluminous X-ray sources and intermediate mass black holes – the missing link?
  • Time scales and variability in different accretion states
  • Spin evolution and black hole mergers
  • Feeding and feedback across the mass scale
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EWASS 2013

Finland will attend the European Week of Astronomy and Space Science, which is going to be held on 8 – 13 July 2013 in Logomo Centre in Turku, Finland. EWASS is the annual meeting of the EAS. On Saturday, 13 July, is also the Plenary discussion on the ASTRONET Mid-Term Review that is closely connected to the EWASS meeting.

The programme for the EWASS 2013 has now been finalized, but small additions are still possible. The pdf-version of the programme with all the timetables and details can be downloaded here. We are going to print this for the meeting and you will have this during the registration.

Symposia

S1: Solar activity and its manifestations in the heliosphere (PI Rami Vainio)
S2: The physics of accretion on compact objects (PI Juri Poutanen)
S3: Science with Planck data (PI Pekka Heinämäki)
S4: The mystery of ellipticals (PI Peter Johansson)
S5: Local group, local cosmology (PI Matteo Monelli/Stefania Salvadori)
S7: Stellar magnetic activity across the HR diagram (PI Maarit Mantere)
S8: Deaths of massive stars as supernovae and gamma-ray bursts (PI Seppo Mattila)
S9: Extreme physics of neutron stars (PI Dmitry Yakovlev)
S10:The co-evolution of black holes and galaxies (PI Jari Kotilainen)
S11: Gaia research for European astronomy training (PI Nicholas Walton)
S12: The gamma-ray sky in the era of Fermi and Cherenkov telescopes (PI Tuomas Savolainen/Elina Lindfors)

Special sessions

Sp1: Astronomy education and public outreach (PI Mikko Hanski)
Sp2: RADIONET: “The role of modern radio observatories in black hole and jet studies” (F.Mantovani/T. Savolainen/M. Tornikoski)
Sp3: Fundamental stellar parameters (PI Luca Casagrande)
Sp4: The origin of interstellar dust (PI Patrice Bouchet)
Sp5: Thick discs: clues for galaxy formation and evolution (PI Sebastien Comeron)
Sp6: AGN, galaxy mergers, supermassive black holes and gravitational waves (PI Stefanie Komossa/Mauri Valtonen)
Sp7: Science with present and future interferometric instruments (PI Jean Surdej)
Sp8: Galactic molecular clouds and their chemistry (PI Mika Juvela)
Sp9: Stellar dynamics and celestial mechanics in modern astrophysics (PI Rainer Spurzem/Seppo Mikkola)
Sp10: Chemo-dynamical galaxy evolution (PI Gerhard Hensler)
Sp11: Rocks in our Solar System (PI Tomas Kohout)
Sp12: A fresh look at the stellar initial mass function (PI Ignacio Ferreras)
Sp13: Starburst galaxies now and then with ALMA (PI Jari Kotilainen)
Sp14: LOFT, the large observatory for X-ray timing (PI Enrico Bozzo)

The restless nature of AGNs

bh_artistIt is widely accepted that variability provides important information on the nature of the emission mechanisms and the geometry of the central source in Active Galactic Nuclei. This is an exciting time in the field of AGN variability, due to the wealth of new results produced in the last few years. This conference intends to focus on radio-quiet sources, discussing our current understanding of the central source variability across the IR, optical, and UV regimes up to hard X-rays, and the clues that variability provides about the physics and structure of the AGN phenomena. The contributions are intended to address the problem of AGN variability both from the observational and theoretical point of view, on short and long time scales, presenting results and expectations from wide-field/deep surveys, pointed observations, ground-based and space observatories.

Topics:

•X-ray flux and spectral variability

•Outflows and SED variability

•The UV-X ray connection

•Variability on the optical band: reverberation, the continuum and the full sky surveys

•AGN variability analysis methods

•Variability in MHD simulations of accretion flows

The TAIPAN Survey: Toward the Next Generation of Spectroscopic All-Sky Surveys

The TAIPAN Survey: Toward the Next Generation of Spectroscopic All-Sky Surveys – The workshop is designed to bring together experts and researchers to discuss the science prospects and goals of the proposed TAIPAN survey.  Continua a leggere The TAIPAN Survey: Toward the Next Generation of Spectroscopic All-Sky Surveys