Modeling Pulsars in dense star clusters

2019 ◽  
Vol 14 (S351) ◽  
pp. 549-552
Author(s):  
Claire S. Ye ◽  
Kyle Kremer ◽  
Sourav Chatterjee ◽  
Carl L. Rodriguez ◽  
Frederic A. Rasio
Keyword(s):  
Globular Clusters ◽  
Stellar Dynamics ◽  
Monte Carlo Code ◽  
Intrinsic Properties ◽  
Radio Pulsars ◽  
Dynamical Interaction ◽  
Interaction Processes ◽  
Formation And Evolution ◽  
Cluster Monte Carlo ◽  
Millisecond Radio

AbstractOver a hundred millisecond radio pulsars (MSPs) have been observed in globular clusters (GCs), motivating theoretical studies of the formation and evolution of these sources through stellar evolution coupled to stellar dynamics. Here we study MSPs in GCs using realistic N-body simulations with our Cluster Monte Carlo code. We show that neutron stars (NSs) formed in electron-capture supernovae can be spun up through mass transfer to form MSPs. Both NS formation and spin-up through accretion are greatly enhanced through dynamical interaction processes. We find that our models for average GCs at the present day with masses ≍ 2 × 105M⊙ can produce up to 10 – 20 MSPs, while a very massive GC model with mass ≍ 106M⊙ can produce close to 100. We show that the number of MSPs is anti-correlated with the total number of stellar-mass black holes (BHs) retained in the host cluster. As a result, the number of MSPs in a GC could be used to place constraints on its BH population. Some intrinsic properties of MSP systems in our models (such as the magnetic fields and spin periods) are in good overall agreement with observations.

scholarly journals Theoretical Implications of the 47 Tuc Pulsars

2000 ◽  
Vol 177 ◽  
pp. 589-594
Author(s):  
Frederic A. Rasio
Keyword(s):  
Globular Cluster ◽  
Globular Clusters ◽  
Radio Pulsars ◽  
Formation And Evolution ◽  
Millisecond Radio

AbstractTwenty millisecond radio pulsars have now been observed in the globular cluster 47 Tuc. This is by far the largest sample of radio pulsars known in any globular cluster. These recent observations provide a unique opportunity to re-examine theoretically the formation and evolution of recycled pulsars in globular clusters.

scholarly journals Millisecond radio pulsars in globular clusters

1989 ◽  
Vol 241 (1) ◽  
pp. 51-57 ◽  
Author(s):  
F. Verbunt ◽  
W. H. G. Lewin ◽  
J. van Paradijs
Keyword(s):  
Globular Clusters ◽  
Radio Pulsars ◽  
Millisecond Radio

The Formation and Evolution of Candidate Young Globular Clusters in NGC 3256

1999 ◽  
Vol 118 (2) ◽  
pp. 752-764 ◽  
Author(s):  
Stephen E. Zepf ◽  
Keith M. Ashman ◽  
Jayanne English ◽  
Kenneth C. Freeman ◽  
Ray M. Sharples
Keyword(s):  
Globular Clusters ◽  
Formation And Evolution

scholarly journals Evolution of redback radio pulsars in globular clusters

2017 ◽  
Vol 598 ◽  
pp. A35 ◽  
Author(s):  
O. G. Benvenuto ◽  
M. A. De Vito ◽  
J. E. Horvath
Keyword(s):  
Globular Clusters ◽  
Radio Pulsars

scholarly journals The Ghosts of Galaxies: Tidal Debris in Clusters

2004 ◽  
Vol 217 ◽  
pp. 70-76
Author(s):  
Michael D. Gregg ◽  
Michael J. West
Keyword(s):  
Globular Clusters ◽  
Surface Brightness ◽  
Large Scale ◽  
Dwarf Galaxies ◽  
Cluster Formation ◽  
X Ray ◽  
Cluster Evolution ◽  
Low Surface Brightness ◽  
Intergalactic Space ◽  
Formation And Evolution

Gravitational interactions in rich clusters can strip material from the outer parts of galaxies or even completely disrupt entire systems, giving rise to large scale, low surface brightness ghostly features stretching across intergalactic space. The nearby Coma and Centaurus clusters both have striking examples of galaxy ghosts, in the form of 100 kpc-long plumes of intergalactic debris. By searching HST archival images, we have found numerous other examples of galaxy ghosts in rich clusters at low redshift, evidence that galaxy destruction and recycling are ubiquitous, important in cluster formation and evolution, and continue to mold clusters at the present epoch. Many ghosts appear in X-ray bright clusters, perhaps signaling a connection with energetic subcluster mergers.The fate of such material has important ramifications for cluster evolution. Our new HST WFPC2 V & I images of a portion of the Centaurus plume reveal that it contains an excess of discrete objects with −12 < MV < −6, consistent with being globular clusters or smaller dwarf galaxies. This tidally liberated material is being recycled directly into the intracluster population of stars, dwarf galaxies, globular clusters, and gas, which may have been built largely from a multitude of similar events over the life of the cluster.

scholarly journals The Formation and Evolution of LMC Globular Clusters: The Database

1999 ◽  
Vol 190 ◽  
pp. 460-461 ◽  
Author(s):  
S. F. Beaulieu ◽  
R. Elson ◽  
G. Gilmore ◽  
R. A. Johnson ◽  
N. Tanvir ◽  
...  
Keyword(s):  
Binary Stars ◽  
Globular Clusters ◽  
Star Clusters ◽  
Data Set ◽  
Luminosity Functions ◽  
Formation And Evolution ◽  
Mass Segregation ◽  
Large Cycle

We present details of the database from a large Cycle 7 HST project to study the formation and evolution of rich star clusters in the LMC (see Elson et al., this volume). Our data set, which includes NICMOS, WFPC2 and STIS images of 8 clusters, will enable us to derive deep luminosity functions for the clusters and to investigate the universality of the stellar IMF. We will look for age spreads in the youngest clusters, quantify the population of binary stars in the cores of the clusters and at the half-mass radii, and follow the development of mass segregation.

scholarly journals Dynamics and Binary (Trans)formation in Globular Clusters

1996 ◽  
Vol 165 ◽  
pp. 377-388
Author(s):  
Piet Hut
Keyword(s):  
Globular Clusters ◽  
Stellar Dynamics ◽  
Diagnostic Tools ◽  
Reaction Products ◽  
Exchange Reactions ◽  
Blue Stragglers ◽  
The Past ◽  
X Ray Binaries ◽  
Triple Star ◽  
Made In

Globular clusters form ideal laboratories for studying the interactions between stellar evolution and stellar dynamics. In the past, highly exceptional systems such as X-ray binaries and later millisecond pulsars have provided us with useful diagnostic tools. However, the fate of the bulk of the more normal stars has remained less clear. At present, rapid progress is being made in our understanding of the distributions of normal stars and primordial binaries, as well as their most abundant reaction products: blue stragglers and binaries that are produced through exchange encounters with other single stars or binaries. The complexity of the network of exchange reactions is illustrated through some specific examples, such as a formation scenario for the hierarchical triple system containing the millisecond pulsar PSR B1620-26 in M4, the first triple star system ever detected in a globular cluster.

Phase space complexity of star clusters: Fresh observables for old and new questions

2019 ◽  
Vol 14 (S351) ◽  
pp. 389-394
Author(s):  
Anna Lisa Varri ◽  
Philip G. Breen ◽  
Douglas C. Heggie
Keyword(s):  
Phase Space ◽  
Globular Clusters ◽  
Star Clusters ◽  
Stellar Dynamics ◽  
Stellar Systems ◽  
Internal Dynamics ◽  
The Rich ◽  
Evolving Context ◽  
New Generation ◽  
Precision Astrometry

AbstractThe blooming era of precision astrometry for Galactic studies truly brings the rich internal dynamics of globular clusters to the centre stage. But several aspects of our current understanding of fundamental collisional stellar dynamics cannot match such new-generation data and the theoretical ambitions they trigger. This rapidly evolving context offers the stimulus to address a number of old and new questions concerning the phase space properties of this class of stellar systems.

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