The gravitational wave background from star-massive black hole fly-bys (2009)
Toonen, Silvia, Hopman, Clovis, Freitag, Marc
Stars on eccentric orbits around a massive black hole (MBH) emit bursts of gravitational waves (GWs) at periapse. Such events may be directly resolvable in the Galactic centre. However, if the star...
Gravitational waves from eccentric intermediate-mass black hole binaries (2009)
Amaro-Seoane, Pau, Miller, Cole, Freitag, Marc
If binary intermediate-mass black holes (IMBHs; with masses between 100 and $10^4 \Msun$) form in dense stellar clusters, their inspiral will be detectable with the planned Laser Interferometer Space...
Gravitational Waves from Eccentric Intermediate-mass Black Hole Binaries (2009)
Amaro-Seoane, Pau, Miller, M. Coleman, Freitag, Marc
f binary intermediate-mass black holes (IMBHs; with masses between 100 and 10(4) M-circle dot) form in dense stellar clusters, their inspiral will be detectable with the planned Laser Interferometer...
Red giant stellar collisions in the Galactic Centre (2008)
Dale, James E., Davies, Melvyn B., Church, Ross P., Freitag, Marc
We show that collisions with stellar--mass black holes can partially explain the absence of bright giant stars in the Galactic Centre, first noted by Genzel et al, 1996. We show that the missing...
Stellar Collisions in Young Clusters: Formation of (Very) Massive Stars? (2007)
In young star clusters, the density can be high enough and the velocity dispersion low enough for stars to collide and merge with a significant probability. This has been suggested as a possible way...
Dynamics of galactic nuclei: Mass segregation and collisions (2007)
Freitag, Marc, Dale, James E., Church, Ross P., Davies, Melvyn B.
Massive black holes (MBHs) with a mass below ~ 1e7 Msun are likely to reside at the centre of dense stellar nuclei shaped by 2-body relaxation, close interactions with the MBH and direct collisions....
Amaro-Seoane, Pau, Gair, Jonathan R., Freitag, Marc, Miller, M. Coleman, Mandel, Ilya, Cutler, Curt J., ...
Black hole binaries with extreme (gtrsim104:1) or intermediate (~102–104:1) mass ratios are among the most interesting gravitational wave sources that are expected to be detected by the proposed...
Amaro-Seoane, Pau, Gair, Jonathan R., Freitag, Marc, Miller, M. Coleman, Mandel, Ilya, Cutler, Curt J., ...
Black hole binaries with extreme ($\gtrsim 10^4:1$) or intermediate ($\sim 10^2-10^4:1$) mass ratios are among the most interesting gravitational wave sources that are expected to be detected by the...
Amaro-Seoane, Pau, Gair, Jonathan R., Freitag, Marc, Miller, M. Coleman, Mandel, Ilya, Cutler, Curt, ...
Black hole binaries with extreme ($\gtrsim 10^4:1$) or intermediate ($\sim 10^2-10^4:1$) mass ratios are among the most interesting gravitational wave sources that are expected to be detected by the...
Gravitational wave bursts from the Galactic massive black hole (2006)
Hopman, Clovis, Freitag, Marc, Larson, Shane L.
The Galactic massive black hole (MBH), with a mass of Mbh=3.6\times10^6 Solar masses, is the closest known MBH, at a distance of only 8 kpc. The proximity of this MBH makes it possible to observe...
Amaro-Seoane, Pau, Freitag, Marc
Observations suggest that star clusters often form in binaries or larger bound groups. Therefore, mergers between two clusters are likely to occur. If these clusters both harbor an intermediate-mass...
The MODEST questions: challenges and future directions in stellar cluster research (2006)
Davies, Melvyn B., Amaro-Seoane, Pau, Bassa, Cees, Dale, Jim, De Angeli, Francesca, Freitag, Marc, ...
We present a review of some of the current major challenges in stellar cluster research, including young clusters, globular clusters, and galactic nuclei. Topics considered include: primordial mass...
Models of mass segregation at the Galactic centre (2006)
Freitag, Marc, Amaro-Seoane, Pau, Kalogera, Vassiliki
We study the process of mass segregation through 2-body relaxation in galactic nuclei with a central massive black hole (MBH). This study has bearing on a variety of astrophysical questions, from the...
Stellar remnants in galactic nuclei: mass segregation (2006)
Freitag, Marc, Amaro-Seoane, Pau, Kalogera, Vassiliki
The study of how stars distribute themselves around a massive black hole (MBH) in the center of a galaxy is an important prerequisite for the understanding of many galactic-center processes. These...
Amaro-Seoane, Pau, Freitag, Marc
Observations suggest that star clusters often form in binaries or larger bound groups. Therefore, mergers between two clusters are likely to occur. If these clusters both harbor an intermediate-mass...
The MODEST questions: Challenges and future directions in stellar cluster research (2006)
Davies, Melvyn B., Amaro-Seoane, Pau, Bassa, Cees, Dale, Jim, De Angeli, Francesca, Freitag, Marc, ...
We present a review of some of the current major challenges in stellar cluster research, including young clusters, globular clusters, and galactic nuclei. Topics considered include: primordial mass...
Stellar remnants in galactic nuclei: Mass segregation (2006)
Freitag, Marc, Amaro-Seoane, Pau, Kalogera, V.
The study of how stars distribute themselves around a massive black hole (MBH) in the center of a galaxy is an important prerequisite for the understanding of many galactic-center processes. These...
Stellar remnants in galactic nuclei: mass segregation (2006)
Freitag, Marc, Amaro-Seoane, Pau, Kalogera, Vassiliki
The study of how stars distribute themselves around a massive black hole (MBH) in the center of a galaxy is an important prerequisite for the understanding of many galactic-center processes. These...
Amaro-Seoane, Pau, Freitag, Marc
Observations suggest that star clusters often form in binaries or larger bound groups. Therefore, mergers between two clusters are likely to occur. If these clusters both harbor an intermediate-mass...
Models of mass segregation at the Galactic centre (2006)
Freitag, Marc, Amaro-Seoane, Pau, Kalogera, Vassiliki
We study the process of mass segregation through 2-body relaxation in galactic nuclei with a central massive black hole (MBH). This study has bearing on a variety of astrophysical questions, from the...
The MODEST questions: challenges and future directions in stellar cluster research (2006)
Davies, Melvyn B., Amaro-Seoane, Pau, Bassa, Cees, Dale, Jim, De Angeli, Francesca, Freitag, Marc, ...
We present a review of some of the current major challenges in stellar cluster research, including young clusters, globular clusters, and galactic nuclei. Topics considered include: primordial mass...
Binary Encounters With Supermassive Black Holes: Zero-Eccentricity LISA Events (2005)
Miller, M. Coleman, Freitag, Marc, Hamilton, Douglas P., Lauburg, Vanessa M.
Current simulations of the rate at which stellar-mass compact objects merge with supermassive black holes (called extreme mass ratio inspirals, or EMRIs) focus on two-body capture by emission of...
Runaway collisions in young star clusters. I. Methods and tests (2005)
Freitag, Marc, Rasio, Frederic A., Baumgardt, Holger
We present the methods and preparatory work for our study of the collisional runaway scenario to form a very massive star (VMS, M > 400 Msun) at the centre of a young, compact stellar cluster. In the...
Runaway collisions in young star clusters. II. Numerical results (2005)
Freitag, Marc, Gürkan, M. Atakan, Rasio, Frederic A.
We present a new study of the collisional runaway scenario to form an intermediate-mass black hole (IMBH, MBH > 100 Msun) at the centre of a young, compact stellar cluster. The first phase is the...
Collisions Between Single Stars in Dense Clusters: Runaway Formation of a Massive Object (2004)
Freitag, Marc, Gürkan, M. Atakan, Rasio, Frederic A.
Using Monte Carlo codes, we follow the collisional evolution of clusters in a variety of scenarios. We consider the conditions under which a cluster of main sequence stars may undergo rapid core...
Run-away formation of intermediate-mass black holes in dense star clusters (2004)
Freitag, Marc, Gürkan, M. Atakan, Rasio, Frederic A.
We consider spherical stellar clusters with a broad mass function and a relaxation time short enough so that the segregation of massive stars toward the centre occurs before they have time to evolve...
A comprehensive set of simulations of high-velocity collisions between main sequence stars (2004)
We report on a very large set of simulations of collisions between two main sequence (MS) stars. These computations were done with the ``Smoothed Particle Hydrodynamics'' method. Realistic stellar...
Amaro-Seoane, Pau, Freitag, Marc, Spurzem, Rainer
To be presented is a study of the secular evolution of a spherical stellar system with a central star-accreting black hole (BH) using the anisotropic gaseous model. This method solves numerically...
Gürkan, M. Atakan, Freitag, Marc, Rasio, Frederic A.
We study the early dynamical evolution of young, dense star clusters using Monte Carlo simulations for systems with up to N~10^7 stars. Rapid mass segregation of massive main-sequence stars and the...
Captures of stars by a massive black hole: Investigations in numerical stellar dynamics (2003)
Among the astrophysical systems targeted by LISA, stars on relativistic orbits around massive black holes (MBHs) are particularly promising sources. Unfortunately, the prediction for the number and...
Formation of Massive Black Holes in Dense Star Clusters (2003)
Rasio, Frederic A., Freitag, Marc, Gürkan, M. Atakan
We review possible dynamical formation processes for central massive black holes in dense star clusters. We focus on the early dynamical evolution of young clusters containing a few thousand to a few...
Sills, Alison, Deiters, Stefan, Eggleton, Peter P., Freitag, Marc, Giersz, Mirek, Heggie, Douglas C., ...
This is a summary paper of MODEST-2, a workshop held at the Astronomical Institute ‘Anton Pannekoek’ in Amsterdam, 16-17 December 2002. MODEST is a loose collaboration of people...
Sills, Alison, Deiters, Stefan, Eggleton, Peter P., Freitag, Marc, Giersz, Mirek, Heggie, Douglas C., ...
This is a summary paper of MODEST-2, a workshop held at the Astronomical Institute ‘Anton Pannekoek’ in Amsterdam, 16-17 December 2002. MODEST is a loose collaboration of people...
Sills, Alison, Deiters, Stefan, Eggleton, Peter P., Freitag, Marc, Giersz, Mirek, Heggie, Douglas C., ...
This is a summary paper of MODEST-2, a workshop held at the Astronomical Institute ‘Anton Pannekoek’ in Amsterdam, 16-17 December 2002. MODEST is a loose collaboration of people...
Sills, Alison, Deiters, Stefan, Eggleton, Peter P., Freitag, Marc, Giersz, Mirek, Heggie, Douglas C., ...
This is a summary paper of MODEST-2, a workshop held at the Astronomical Institute ‘Anton Pannekoek’ in Amsterdam, 16-17 December 2002. MODEST is a loose collaboration of people...
Sills, Alison, Deiters, Stefan, Eggleton, Peter P., Freitag, Marc, Giersz, Mirek, Heggie, Douglas C., ...
This is a summary paper of MODEST-2, a workshop held at the Astronomical Institute ‘Anton Pannekoek’ in Amsterdam, 16-17 December 2002. MODEST is a loose collaboration of people...
Gravitational waves from stars orbiting the Sagittarius A* black hole (2002)
One of the main astrophysical processes leading to strong emission of gravitational waves to be detected by the future space-borne interferometer LISA is the capture of a compact star by a black hole...
We have recently written a new code to simulate the long term evolution of spherical clusters of stars. It is based on the pioneering Monte Carlo scheme proposed by Henon in the 70's. Our code has...
The capture and gradual inspiral of stellar mass objects by a massive black hole at the centre of a galaxy has been proposed as one of the most promising source of gravitational radiation to be...
A new Monte Carlo code for star cluster simulations: I. Relaxation (2001)
We have developed a new simulation code aimed at studying the stellar dynamics of a galactic central star cluster surrounding a massive black hole. In order to include all the relevant physical...
Monte Carlo Simulations of Dense Galactic Nuclei (2001)
We have developed a new numerical code to simulate the joint evolution of a massive black hole (MBH) and a surrounding stellar cluster at the center of a galaxy. The physics treated in the...
A Monte Carlo Code to Investigate Stellar Collisions in Dense Galactic Nuclei (2001)
Stellar collisions have long been envisioned to be of great importance in the center of galaxies where densities of 1e6 stars per cubic pc or higher are attained. Not only can they play a unique...
Collisional stellar dynamics in galactic nuclei hosting a massive black hole / (2000)
Thèse sc. Genève.
Aus: Canadian journal of anaesthesia ; 43. 1996
Amaro-Seoane, Pau, Gair, Jonathan R., Freitag, Marc, Coleman Miller, M., Mandel, Ilya, Cutler, Curt J., ...
Black hole binaries with extreme ($\gtrsim 10^4:1$) or intermediate ($\sim 10^2-10^4:1$) mass ratios are among the most interesting gravitational wave sources that are expected to be detected by the...