Dynamical and chemical effects of FR II radio sources on the intra-cluster medium (2008)
Huarte-Espinosa, Martin, Krause, Martin, Alexander, Paul, Kaiser, Christian R.
We investigate the effects of intermittent strong jets from an Active Galactic Nuclei (AGN) of a massive galaxy in the core of a cool core galaxy cluster, on the dynamics and metal distribution of...
Erratum: Luminosity function, sizes and FR dichotomy of radio-loud AGN (2007)
Kaiser, Christian R., Best, Philip N.
This erratum corrects a number of formulae containing mistakes in the paper 'Luminosity function, sizes and FR dichotomy of radio-loud AGN', 2007, MNRAS, v. 381, p.1548. The corrections do not alter...
The Lifetime of FRIIs in Groups and Clusters: Implications for Radio-Mode Feedback (2007)
Bird, Jonathan C., Martini, Paul, Kaiser, Christian R.
We determine the maximum lifetime t_max of 52 FRII radio sources found in 26 central group galaxies from cross correlation of the Berlind SDSS group catalog with the VLA FIRST survey. Mock catalogs...
Morphology of flows and buoyant bubbles in the Virgo cluster (2007)
Pavlovski, Georgi, Kaiser, Christian R., Pope, Edward C. D., Fangohr, Hans
There is growing evidence that the active galactic nuclei (AGN) associated with the central elliptical galaxy in clusters of galaxies are playing an important role in the evolution of the...
Dynamics of buoyant bubbles in clusters of galaxies (2007)
Pavlovski, Georgi, Kaiser, Christian R., Pope, Edward C. D.
We present a phenomenological model of the dynamics of buoyant bubbles in the atmosphere of a cluster of galaxies. The derived equations describe velocity, size, mass, temperature and density of the...
Luminosity function, sizes and FR dichotomy of radio-loud AGN (2007)
Kaiser, Christian R., Best, Philip N.
The radio luminosity function (RLF) of radio galaxies and radio-loud quasars is often modelled as a broken power-law. The break luminosity is close to the dividing line between the two Fanaroff-Riley...
The lifecycle of powerful AGN outflows (2006)
Kaiser, Christian R., Best, Philip N.
During the course of this conference, much evidence was presented that points to an intimate connection between the energetic outflows driven by AGN and the energy budget and quite possibly also the...
In this review I concentrate exclusively on models for the large-scale structure created by jet flows in AGN. I briefly mention models for the evolution and emission of these objects and how they can...
Jet-powered optical nebulae from X-ray binaries (2006)
Russell, David M., Fender, Rob P., Gallo, Elena, Kaiser, Christian R.
Accreting black holes and neutron stars release an unknown fraction of the infalling particles and energy in the form of collimated jets. The jets themselves are radiatively inefficient, but their...
Heating Rate Profiles in Galaxy Clusters (2006)
Pope, Edward C. D., Pavlovski, Georgi, Kaiser, Christian R., Fangohr, Hans
In recent years evidence has accumulated suggesting that the gas in galaxy clusters is heated by non-gravitational processes. Here we calculate the heating rates required to maintain a physically...
The flat synchrotron spectra of partially self-absorbed jets revisited (2006)
Flat radio spectra with large brightness temperatures at the core of AGN and X-ray binaries are usually interpreted as the partially self-absorbed bases of jet flows emitting synchrotron radiation....
Sokoloski, J. L., Kenyon, S. J., Espey, B. R., Keyes, Charles D., McCandliss, S. R., Kong, A. K. H., ...
We describe observational evidence for a new kind of interacting-binary-star outburst that involves both an accretion instability and an increase in thermonuclear shell burning on the surface of an...
The Effect of Thermal Conduction on the Virgo Cluster (2005)
Pope, Edward C. D., Pavlovski, Georgi, Kaiser, Christian R., Fangohr, Hans
Thermal conduction has been suggested as a possible mechanism by which sufficient energy is supplied to the central regions of galaxy clusters to balance the effect of radiative cooling. Here we...
Radio synchrotron spectra for a leaky box approximation (2005)
The synchrotron emission observed from many astrophysical objects is commonly modelled to arise from relativistic electrons in an emission region occupied by a spatially homogeneous, but tangled...
The stability of buoyant bubbles in the atmospheres of galaxy clusters (2005)
Kaiser, Christian R., Pavlovski, Georgi, Pope, Edward C.D., Fangohr, Hans
The buoyant rise of hot plasma bubbles inflated by active galactic nuclei outflows in galaxy clusters can heat the cluster gas and thereby compensate radiative energy losses of this material....
Is GRS 1915+105 a microquasar? (2004)
Kaiser, Christian R., Sokoloski, J. L., Gunn, Katherine F., Brocksopp, Catherine
The large mechanical luminosity of the jets of GRS 1915+105 should give rise to luminous emission regions, similar to those observed in radio galaxies, where the jets interact with the gas...
Revision of the properties of the GRS 1915+105 jets: Clues from the large-scale structure (2004)
Kaiser, Christian R., Gunn, Katherine F., Brocksopp, Catherine, Sokoloski, J. L.
The jets of GRS 1915+105 carry a considerable energy away from the central source into the ISM. The similarity of the jets of this source and jets in radio galaxies or radio-loud quasars suggests...
Revision of the Properties of the GRS 1915+105 Jets: Clues from the Large-Scale Structure (2004)
Kaiser, Christian R., Gunn, Katherine F., Brocksopp, Catherine, Sokoloski, Jennifer L.
The jets of GRS 1915+105 carry a considerable energy away from the central source into the interstellar medium (ISM). The similarity of the jets of this source and jets in radio galaxies or...
Entropy Evolution of the Gas in Cooling Flow Clusters (2003)
Kaiser, Christian R., Binney, James J.
We emphasise the importance of the gas entropy in studying the evolution of cluster gas evolving under the influence of radiative cooling. On this basis, we develop an analytical model for this...
Hot and cold bubbles in M87 (2003)
The X-ray data obtained with XMM-Newton is used to investigate the complex structure of the gas in the atmosphere of the Virgo cluster around M87. We construct a simple model for the temperature and...
Simple models of cooling flows (2003)
Kaiser, Christian R., Binney, James
A semi-analytic model of cluster cooling flows is presented. The model assumes that episodic nuclear activity followed by radiative cooling without mass-dropout cycles the cluster gas between a...
Hot and cold bubbles in M87 (2003)
The X-ray data obtained with XMM-Newton are used to investigate the complex structure of the gas in the atmosphere of the Virgo cluster around M87. We construct a simple model for the temperature and...
First INTEGRAL observations of GRS 1915+105 (2003)
Hannikainen, D.C., Kaiser, Christian R., Rodriguez, J., Brandt, S., Westergaard, N.J., ...
We present data from the first of six monitoring Open Time observations of GRS 1915+105 undertaken with the orbiting INTEGRAL satellite. The source was clearly detected with all three X-ray and...
AGN as cosmic thermostats (2002)
Kaiser, Christian R., Brueggen, Marcus, Binney, James J.
We present a simple analytical model and the results of numerical simulations supporting the idea of periodical heating of cluster gas by AGN outflows. We show why, under this assumption, we are...
Modelling Oscillations in GRS 1915+105 Jet Emission (2002)
Collins, Ross S., Kaiser, Christian R., Cox, Simon J.
We have studied time variability in the flux from the flat spectrum synchrotron radiation of the Blandford & Konigl (1979) model for relativistic, conical jets. The resulting model has been applied...
Hot Bubbles from Active Galactic Nuclei as a Heat Source in Cooling Flow Clusters (2002)
Brueggen, Marcus, Kaiser, Christian R.
The hot plasma permeating clusters of galaxies often shows a central peak in the X-ray surface brightness that is coincident with a drop in entropy. This is taken as evidence for a cooling flow where...
Modelling Oscillations in the Jet Emission from Microquasar GRS 1915+105 (2002)
Collins, Ross S., Kaiser, Christian R., Cox, Simon J.
The variability in the infrared to millimetre emission from microquasar GRS 1915+105 is believed to be dominated by the system's relativistic jet. In this paper we develop a time-dependent version of...
Simple models of cooling flows (2002)
Kaiser, Christian R., Binney, James J.
A semi-analytic model of cluster cooling flows is presented. The model assumes that episodic nuclear activity followed by radiative cooling without mass-dropout cycles the cluster gas between a...
Hot bubbles from active galactic nuclei as a heat source in cooling-flow clusters (2002)
Brüggen, Marcus, Kaiser, Christian R.
Hot, X-ray-emitting plasma permeates clusters of galaxies. The X-ray surface brightness often shows a peak near the centre of the cluster that is coincident with a drop in the entropy of the gas....
The death of FRII radio sources and their connection with radio relics (2002)
Kaiser, Christian R., Cotter, Garret
Radio relic sources in galaxy clusters are often described as the remnants of powerful radio galaxies. Here we develop a model for the evolution of such relics after the jets cease to supply energy...
Pair annihilation and radio emission from galactic jet sources: the case of Nova Muscae (2002)
Kaiser, Christian R., Hannikainen, Diana C.
In the hard X-ray spectra of some X-ray binaries line features at around 500 keV are detected. We interpret these as arising from pair annihilation in relativistic outflows leading to a significant...
The death of FR II radio sources and their connection with radio relics (2002)
Kaiser, Christian R., Cotter, Garret
Radio relic sources in galaxy clusters are often described as the remnants of powerful radio galaxies. Here we develop a model for the evolution of such relics after the jets cease to supply energy...
Pair annihilation and radio emission from galactic jet sources: The case of Nova Muscae (2001)
Kaiser, Christian R., Hannikainen, Diana C.
In the hard X-ray spectra of some X-ray binaries line features at around 500 keV are detected. We interpret these as arising from pair annihilation in relativistic outflows leading to a significant...
A 3-dimensional model of the synchrotron emissivity of the cocoons of powerful extragalactic radio sources of type FRII is constructed. Bulk backflow and energy losses of the relativistic electrons,...
Internal shock model for Microquasars (2000)
Kaiser, Christian R., Sunyaev, Rashid, Spruit, Henk C.
We present a model for the radio outbursts of microquasars based on the assumption of quasi-continuous jet ejection. The jets are `lit up' by shock fronts traveling along the jets during outbursts....
Comptonization of the Cosmic Microwave Background by Relativistic Plasma (2000)
Ensslin, Torsten A., Kaiser, Christian R.
(Abridged) We investigate the spectral distortion of the cosmic microwave background (CMB) caused by relativistic plasma. Within the Thomson regime, an exact analytic expression for the photon...
Kaiser, Christian R., Schoenmakers, Arno P., Röttgering, Huub J.A.
A double-double radio galaxy (DDRG) is defined as consisting of a pair of double radio sources with a common centre. In this paper we present an analytical model in which the peculiar radio structure...
Kaiser, Christian R., Schoenmakers, A. P., Rottgering, H. J. A.
A Double-Double Radio Galaxy (DDRG) is defined as consisting of a pair of double radio sources with a common centre. In this paper we present an analytical model in which the peculiar radio structure...
Multi-frequency observations as a key to source and environment parameters of FRII objects (1999)
Our knowledge of the environments of radio-loud AGN is still sketchy. However, to understand the jet phenomenon it is important to know about the properties of the surroundings in which jets are...
Heating of the IGM by FRII radio sources (1999)
Kaiser, Christian R., Alexander, Paul
We present results of a numerical integration of the hydrodynamical equations governing the self-similar, two-dimensional gas flow behind the bow shock of an FRII radio source embedded in an IGM with...
On the cosmological evolution of the FR II radio source population (1999)
Kaiser, Christian R., Alexander, Paul
We present an analytical model for the cosmological evolution of the FR II source population. Based on an earlier model for the intrinsic radio luminosity -- linear size evolution of these objects,...
Heating of the intergalactic medium by FR II radio sources (1999)
Kaiser, Christian R., Alexander, Paul
We present results of a numerical integration of the hydrodynamical equations governing the self-similar, two-dimensional gas flow behind the bow shock of an FR II radio source embedded in an...
On the cosmological evolution of the FRII radio source population (1998)
Kaiser, Christian R., Alexander, Paul
We present an analytical model for the cosmological evolution of the FRII source population. Based on an earlier model for the intrinsic radio luminosity - linear size evolution of these objects, we...
The mutual interaction of powerful radio galaxies and their environments (1998)
Kaiser, Christian R., Alexander, Paul
Using a self-similar model for the expansion of cocoons surrounding the jets in powerful extragalactic radio sources (type FRII), we investigate the influence of the properties of the gas surrounding...
Evolutionary tracks of FRII sources through the P-D diagram (1997)
Kaiser, Christian R., Dennett-Thorpe, Jane, Alexander, Paul
This is the second in a series of papers presenting an analytical model for the evolution of FRII radio sources. In this paper we evaluate the expected radio emission from a radio source...
Internal shock model for Microquasars (1970)
Christian R. Kaiser, Rashid Sunyaev, Henk C. Spruit
. We present a model for the radio outbursts of microquasars based on the assumption of quasi-continuous jet ejection. The jets are `lit up' by shock fronts traveling along the jets during outbursts....