Jets

Steady Jets and Transient Jets

Characteristics and Relationship

Max-Planck-Institut für Radioastronomie
Bonn, Germany
7 - 8 April 2010

Travel    Accomodation    Participants   Program   Presenter instructions Proceedings   Conference Photos   Poster

Scientific Rationale

Jets are a common phenomenon in accreting compact objects, both Galactic and extragalactic, and results of the last years show that there exist two types of jets with completely different characteristics. The first type of jet is a result of magneto-rotational processes within an optically thick (flat or inverted spectrum) radio core region, from which emerges a quasi-steady slowly moving jet, with Kelvin-Helmholtz instabilities dominating its morphology and dynamics that are best seen in AGNs. The second type of jet is a result of internal shocks, producing a transient jet which features a sequence of bright and typically optically thin regions that move at superluminal speeds, embedded in the structural patterns produced by instabilities in the underlying flow. These two types are called "steady" vs "transient" jet in the microquasar community and "underlying" vs "shocked" jet in the AGN community. X-ray observations of microquasars show that the steady jet is taking place in the 'low / hard' X-ray state and the transient jet in the 'steep power-law' X-ray state. That means that the two radio states correspond to two different X-ray states. The connection, if any, between the two types of jets continues to challenge observers and theoreticians. Latest results show a possible relationship: internal shocks form when an event like a disk instability or magnetic reconnection creates a faster jet that catches up with the previously generated slowly moving steady jet.

The aim of this workshop is to review the current status of the knowledge about steady and transient jets in various environments, like microquasars, AGN and gamma-ray bursts and to spotlight existing discrepancies/analogies in a fruitful interchange between the members of the different communities. An important goal is to identify the connection between steady jets and transient jets.

The conference will consist of the following sessions:

JET OBSERVATIONS

MHD STEADY JET PRODUCTION AND SHOCK-IN-JET THEORY

JETS AND HIGH-ENERGY EMISSION

In addition to four invited review talks (30 min) per session, contributed papers can be presented in the form of a short-talk (5 min) accompanied by a poster. Ample of time will be dedicated to the poster session.

Review topics and invited speakers

SESSION I:   JET OBSERVATIONS
1.1 Microquasars, AGN and gamma-ray bursts jets: topical questions - F. Mirabel (CEA Saclay)
1.2 Steady jet and transient jets radio/X-ray characteristics -   M. Massi (MPIfR Bonn)
1.3 Quasi-stationary and transitory patterns in jets - A. Lobanov (MPIfR Bonn)

SESSION II: MHD STEADY JET PRODUCTION AND SHOCK-IN-JET THEORY
2.1 Steady jet generation / magnetic acceleration of jets - S. Komissarov (University of Leeds)
2.2 Shock-in-jet model for quasars and microquasars - M. Türler (University of Geneva)
2.3 Formation of MHD jets and flares as trigger of internal shocks - C. Fendt (MPIA Heidelberg)
2.4 New evidence for extreme particle acceleration in microquasars - M. Tavani (INAF-IASF Roma)

SESSION III:   JETS AND HIGH-ENERGY EMISSION
3.1 Correlation between X-ray and gamma-ray emission in TeV blazars - K. Katarzynski (Univ.of Torun)
3.2 Radio jets and high energy emission in microquasars - J.M. Paredes (University of Barcelona)
3.3 Spectral energy distribution of gamma-ray binaries - V. Bosch-Ramon (MPIfK Heidelberg)
3.4 Concluding remarks

Scientific Organizing Committee

Serguei Komissarov (University of Leeds), Andrei Lobanov (MPIfR), Maria Massi (MPIfR, chair), Josep M. Paredes (University of Barcelona), Alan Roy (MPIfR), Marc Türler (University of Geneva)

Local Organizing Committee: Edith Fingas, Christian Fromm, Hedwig Kalisch, Andrei Lobanov, Maria Massi, Alan Roy, Lisa Zimmermann

Conference Venue

The Conference will be held at the Max-Planck-Institut fuer Radioastronomie in Bonn. The institute is just a few km away from the city center and can be conveniently reached by public transportation (see the Travel link).

Proceedings

We will publish the conference proceedings in "Memorie della Societa Astronomica Italiana" (Journal of the Italian Astronomical Society)

Timeline

Please make your own hotel reservation as soon as possible.

Please read the Presenter Instructions and send us your presentation before the conference

Steady Jets and Transient Jets Characteristics and Relationship
		Max-Planck-Institut für Radioastronomie Bonn, Germany 7 - 8 April 2010

Travel Accomodation Participants Program Presenter instructions Proceedings Conference Photos Poster
	Scientific Rationale Jets are a common phenomenon in accreting compact objects, both Galactic and extragalactic, and results of the last years show that there exist two types of jets with completely different characteristics. The first type of jet is a result of magneto-rotational processes within an optically thick (flat or inverted spectrum) radio core region, from which emerges a quasi-steady slowly moving jet, with Kelvin-Helmholtz instabilities dominating its morphology and dynamics that are best seen in AGNs. The second type of jet is a result of internal shocks, producing a transient jet which features a sequence of bright and typically optically thin regions that move at superluminal speeds, embedded in the structural patterns produced by instabilities in the underlying flow. These two types are called "steady" vs "transient" jet in the microquasar community and "underlying" vs "shocked" jet in the AGN community. X-ray observations of microquasars show that the steady jet is taking place in the 'low / hard' X-ray state and the transient jet in the 'steep power-law' X-ray state. That means that the two radio states correspond to two different X-ray states. The connection, if any, between the two types of jets continues to challenge observers and theoreticians. Latest results show a possible relationship: internal shocks form when an event like a disk instability or magnetic reconnection creates a faster jet that catches up with the previously generated slowly moving steady jet. The aim of this workshop is to review the current status of the knowledge about steady and transient jets in various environments, like microquasars, AGN and gamma-ray bursts and to spotlight existing discrepancies/analogies in a fruitful interchange between the members of the different communities. An important goal is to identify the connection between steady jets and transient jets. The conference will consist of the following sessions: JET OBSERVATIONS MHD STEADY JET PRODUCTION AND SHOCK-IN-JET THEORY JETS AND HIGH-ENERGY EMISSION In addition to four invited review talks (30 min) per session, contributed papers can be presented in the form of a short-talk (5 min) accompanied by a poster. Ample of time will be dedicated to the poster session. Review topics and invited speakers SESSION I: JET OBSERVATIONS 1.1 Microquasars, AGN and gamma-ray bursts jets: topical questions - F. Mirabel (CEA Saclay) 1.2 Steady jet and transient jets radio/X-ray characteristics - M. Massi (MPIfR Bonn) 1.3 Quasi-stationary and transitory patterns in jets - A. Lobanov (MPIfR Bonn) SESSION II: MHD STEADY JET PRODUCTION AND SHOCK-IN-JET THEORY 2.1 Steady jet generation / magnetic acceleration of jets - S. Komissarov (University of Leeds) 2.2 Shock-in-jet model for quasars and microquasars - M. Türler (University of Geneva) 2.3 Formation of MHD jets and flares as trigger of internal shocks - C. Fendt (MPIA Heidelberg) 2.4 New evidence for extreme particle acceleration in microquasars - M. Tavani (INAF-IASF Roma) SESSION III: JETS AND HIGH-ENERGY EMISSION 3.1 Correlation between X-ray and gamma-ray emission in TeV blazars - K. Katarzynski (Univ.of Torun) 3.2 Radio jets and high energy emission in microquasars - J.M. Paredes (University of Barcelona) 3.3 Spectral energy distribution of gamma-ray binaries - V. Bosch-Ramon (MPIfK Heidelberg) 3.4 Concluding remarks Scientific Organizing Committee Serguei Komissarov (University of Leeds), Andrei Lobanov (MPIfR), Maria Massi (MPIfR, chair), Josep M. Paredes (University of Barcelona), Alan Roy (MPIfR), Marc Türler (University of Geneva) Local Organizing Committee: Edith Fingas, Christian Fromm, Hedwig Kalisch, Andrei Lobanov, Maria Massi, Alan Roy, Lisa Zimmermann Conference Venue The Conference will be held at the Max-Planck-Institut fuer Radioastronomie in Bonn. The institute is just a few km away from the city center and can be conveniently reached by public transportation (see the Travel link). Proceedings We will publish the conference proceedings in "Memorie della Societa Astronomica Italiana" (Journal of the Italian Astronomical Society) Timeline Please make your own hotel reservation as soon as possible. Please read the Presenter Instructions and send us your presentation before the conference