Archivi tag: Interstellar medium

A 3D View on Galaxy Evolution

To decipher the underlying processes that shape galaxies over time, we need to uncover their physical properties and the conditions controlling them. This in turn requires in-depth measurements of the stars, gas and dust, inside as well as surrounding the galaxies. Continua a leggere A 3D View on Galaxy Evolution

Probing Active Galactic Nuclei with Radio Techniques

Active galactic nuclei (AGNs) derive their power from accretion onto supermassive black holes located in the centers of galaxies.  Many phenomena connected with active galaxies derive from physical processes associated with the central engine’s accretion flow, which, depending on the mass accretion rate and possibly other parameters, such as black hole spin, generate outflows and relativistic jets.  The energy output from the nucleus, whether it be radiative or kinetic, may have a profound influence on the evolution of the host galaxy and its larger scale environment. Continua a leggere Probing Active Galactic Nuclei with Radio Techniques

Revolution in Astronomy with ALMA

The Atacama Large Millimeter/submillimeter Array (ALMA) has been producing a growing number of impressive and scientifically compelling results as the most powerful mm/submm interferometer in the world. Held in central Tokyo, the aim of this four day conference is to highlight the most recent science results from ALMA obtained during the first three years of science operations, and to motivate future collaboration among researchers around the world. Continua a leggere Revolution in Astronomy with ALMA

The X-ray Universe

The XMM-Newton Science Operations Centre is organising a major astrophysical symposium from Monday 16th to Thursday 19th of June 2014 in Dublin, Ireland. The symposium is the fourth international meeting in the series “The X-ray Universe”. The intention is to gather a general collection of research in high energy astrophysics. The symposium will provide a showcase for results, discoveries and expectations from current and future X-ray missions. Continua a leggere The X-ray Universe

The Impact of Feedback on Star and Galaxy Formation

After several decades of theoretical developments and spectacular observations of star formation sites and star forming galaxies, our understanding of star formation in the universe has profoundly evolved. Designing a theory for star formation based on physical first principles is now within our grasp, but to reach this goal we must grapple with the central  role feedback processes from young stars play in regulating star formation in galaxies and in determining the properties of newly born stellar populations deep inside molecular clouds. Modeling feedback processes such as radiation from young stars, stellar winds and ultimately explosive events like supernovae is very challenging. The relative importance of different forms of feedback energy (thermal energy, ionizing and continuum radiation, cosmic rays,  kinetic energy in jets) is still under debate, and the energy injection often occurs at very small scales that are poorly resolved by computer simulations or telescope imaging. Moreover, this energy also couples to very large scales, driving turbulence within the ISM and powering the ejection of powerful galactic winds, both of which contribute to regulating the global star formation efficiency into disk galaxies.

The goal of this conference, the kick-off meeting for our program on the physics of star formation feedback, is to set the scene for the three following months in Santa Barbara.  Focus areas will include discussion of the detailed nature and efficacy of various stellar feedback mechanisms, new theoretical and observational developments on how feedback regulates star formation at a range of scales, and inter-comparisons of numerical methods for implementing feedback in molecular clouds and in galaxies. During the week, various sessions will be dedicated to discuss critical areas where new developments  and new collaborations are needed. For example, observations of large scale gas motions within the Galaxy will be used to set constraints on theoretical and numerical models of the galactic fountain,  while detailed post-processing of computer simulations could be used by observers to infer the physical  properties of stellar outflows. Interactions between theorists and observers, and between experts in small scale and  large scale phenomenon, will shed some light on the role of these feedback processes for regulating star formation.

The Modern Radio Universe 2013

80 years ago, in spring 1933, Karl Jansky published his discovery of cosmic radio emission. This paved the way not only for a new discipline, radio astronomy, but also for an exploration of the universe that now encompasses almost the entire electromagnetic window. Today, radio astronomy is about to enter into yet another new era with a number of new or upgraded radio facilities coming online and major new initiatives, like the Square Kilometre Array (SKA), are starting up. This conference will try to highlight the original and exciting science currently being produced by radio astronomical telescopes, such as the GBT, Effelsberg, LOFAR, ALMA, the JVLA, GMRT, eMERLIN, EVN, VLBA, as well as pathfinder experiments of the SKA, and others.
Science areas that will be discussed are among others: Cosmology, galaxy evolution, AGN and compact objects, star formation, interstellar medium, The Milky Way and Galactic science, radio transients, fundamental and astroparticle physics, extreme physics and associated theory. This fresh view on the radio universe will improve our current knowledge of the universe and highlight new trends in radio astronomy. The science delivered by the radio astronomical community addresses key questions in modern astrophysics that may lead us to even more ambitious science goals to be targeted by future radio facilities like the SKA.
The last Modern Radio Universe took place 2007 in Manchester commemorating 50 years of the Lovell telescope and looking forward towards the SKA. This issue of the conference commemorates the groundbreaking work of Karl Jansky 80 years ago and comes 40 years after the Effelsberg 100 metre telescope started operations. While combining past and future in this conference, the main focus of the science presentations, however, will be to make an inventory of outstanding science results that are presently being obtained with the new or upgraded facilities.

Exploiting the Herschel and Planck data

The Doctoral School of Astronomy-Astrophysics of Paris Area (ED 127) is the only thematic doctoral school in France, in the field of astronomy and astrophysics. The school is supported by four universities or Institutes : the Paris Observatory (carrier), Université Paris-Sud (P11), Université Paris Diderot (P7) and UPMC (P6).

Since 2008, the Doctoral School organizes a biennial international school in the field of observational astronomy, intended for PhD students and postdocs. The third edition of this school will be held in March 2013. The previous two had been very successful and received about 40 participants each, representing more than fifteen different nationalities. This is the third edition of a school with the goal to train young researchers, PhD students and postdocs, regardless of nationality, to the scientific exploitation of two recently launched European space missions, Planck and Herschel. The first results obtained by these two satellites, the most successful ever launched in their respective fields, are reshaping the landscape in many areas of astrophysics (cosmology, galaxies and large structures, star formation, interstellar medium, the solar system) and there is some urgency to introduce the concepts and specific methods of exploitation of their data to future researchers. The school last one week and will follow the organization of the two schools previously held by the ED 127, a scheme that has proved itself and was appreciated by participants. The morning is devoted to lectures given by leading researchers, from around the world, and the afternoon is devoted to practical work in pairs around computers. These includes manipulating data from each satellite, a familiarization with the software to access, treatment and data analysis, using tools developed by space agencies and consortia of the two scientific missions. The astrophysical interpretation will also be addressed by numerical models developed by the community. We will offer to students the opportunity to explore the complete chain that goes from theory to the analysis of astrophysical observations. From a practical standpoint, the whole school will be held at the International Centre of Pedagogical Studies (CIEP) in Sèvres, a center able to accommodate all participants in half-board at a reasonable cost and providing modern teaching facilities. The morning will be devoted to lectures and the afternoon, students will use the computer workstations in special rooms. Students will be invited to present a poster on a topic that motivates them particularly. A laboratory visit will take place during a half day. One feature of this school is to target a wide international audience, particularly to developing countries. Accordingly, we maintain a low registration fee, thanks to a call for funding by several partners.

More info: International Young Astronomer School on Exploiting the Herschel and Planck data