The central kiloparsec: Active Galactic Nuclei and their hosts

Symposium - International Astronomical Union

Journal of Physics: Conference Series, 2006

We summarize some of the new results from contributions made to the Galactic Centre workshop that took place in Bad Honnef, Germany, on April 18-22 2006.

2019

CAPjournal, No. 25, March 2019 The 2018 Communicating Astronomy with the Public Conference is the largest and most diverse astronomy communication conference organised to date. In this article, the local organisation committee in Japan presents an overview of the implementation strategies and the lessons learned, focusing specifically on the needs of the region and the international impact of the conference.

1997

Journal of Astronomical History and Heritage

2012

The book gives an overview on the current knowledge of the Active Galactic Nuclei phenomenon. The spectral energy distribution will be discussed, pointing out what can be observed in different wavebands and with different physical models. Furthermore, the authors discuss the AGN with respect to its environment, host galaxy, feedback in galaxy clusters, etc. and finally the cosmological evolution of the AGN phenomenon. This AGN textbook includes phenomena based on new results in the X-Ray domain from new telescopes such as Chandra, XMM-Newton, Swift, and INTEGRAL not mentioned in any other book. Furthermore, it considers also the Fermi Gamma Ray Space Telescope with its revolutionary advances of unprecedented sensitivity, field of view and all-sky monitoring, and also discusses the very high energy (VHE) regime. Those and other new developments as well as simulations of AGN merging events and formations, enabled through latest super-computing capabilities.

Proceedings of the International Astronomical Union, 2005

We present IACTalks, a free and open access seminars archive (http://iactalks.iac.es) aimed at promoting astronomy and the exchange of ideas by providing high-quality scientific seminars to the astronomical community. The archive of seminars and talks given at the Instituto de Astrofísica de Canarias goes back to 2008. Over 360 talks and seminars are now freely available by streaming over the internet. We describe the user interface, which includes two video streams, one showing the speaker, the other the presentation. A search function is available, and seminars are indexed by keywords and in some cases by series, such as special training courses or the 2011 Winter School of Astrophysics, on secular evolution of galaxies. The archive is made available as an open resource, to be used by scientists and the public.

Nuclear Physics B - Proceedings Supplements, 1989

The first international conference on the central region of our galaxy was held at UCLA during July 25-29, 1988. Radio, infrared, X-, and y-ray astronomers, benefitting from recent technological advances, confronted theorists, as well as each other, with impressive new imagery in each of these domains. Traditionally hidden by an impenetrable veil of dust, the galactic center is now largely transparent, particularly in the near-IR, where the extinction toward the galactic center is an order of magnitude less than at optical wavelengths. On the large scale, one observes a large reservoir of molecular gas, some of v, hich is exhibiting complex, noncircular motions. Some of the kinematical behavior is best explained in terms of energetic explosions occurring about 107 years ago. The radio continuum reveals numerous filaments of ionized gas, and strong, poloidal magnetic fields are implied, quite unlike the field anywhere else in the galaxy. On small scales, much effort is going into the attempt to identify a unique object at the nucleus that may or may not be a massive black hole (a mass of 3 x 106 M® has been defended). Candidates exist for a compact mass concentration, and for a strong central luminosity source, but they are not necessarily one arid the same, and there are problems identifying any of the candidates with a massive accreting object at the center. Surrounding the dynamical center of the galaxy is the prominent radio source Sgr A, which includes a warm, turbulent circumnuclear disk on 5 to 10 pc scales, streamers of ionized gas which may represent flows of material into the central potential well, and a background shell of nonthermal radio emission, probably a superimposed supernova remnant. This summary describes some of the current research activity on the galactic center, with particular attention to the implications of X-and y-ray observations.