Black holes merging with low mass gap objects inside globular clusters

Kritos, Konstantinos; Cholis, Ilias

doi:10.1103/physrevd.104.043004

Cited by 11 publications

(10 citation statements)

References 82 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…binaries formed dynamically with a compact object coming from each population) because, generally, the merger rates produced by dynamical capture are insufficient to explain the observed events under reasonable assumptions on the dark matter overdensity in star clusters[31,170,171]. We note, however, that multiple exchange interactions may boost the formation rate for those mixed objects, as suggested in Refs [31,172]…”

mentioning

confidence: 73%

How to assess the primordial origin of single gravitational-wave events with mass, spin, eccentricity, and deformability measurements

Franciolini,

Cotesta,

Loutrel

et al. 2021

Preprint

View full text Add to dashboard Cite

A population of primordial black holes formed in the early Universe could contribute to at least a fraction of the black-hole merger events detectable by current and future gravitational-wave interferometers. With the ever-increasing number of detections, an important open problem is how to discriminate whether a given event is of primordial or astrophysical origin. We systematically present a comprehensive and interconnected list of discriminators that would allow us to rule out, or potentially claim, the primordial origin of a binary by measuring different parameters, including redshift, masses, spins, eccentricity, and tidal deformability. We estimate how accurately future detectors (such as the Einstein Telescope and LISA) could measure these quantities, and we quantify the constraining power of each discriminator for current interferometers. We apply this strategy to the GWTC-3 catalog of compact binary mergers. We show that current measurement uncertainties do not allow us to draw solid conclusions on the primordial origin of individual events, but this may become possible with next-generation ground-based detectors.

show abstract

mentioning

confidence: 73%

How to assess the primordial origin of single gravitational-wave events with mass, spin, eccentricity, and deformability measurements

Franciolini,

Cotesta,

Loutrel

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…In Ref. [25], a numerical scheme was developed to model the dynamical interactions of low mass gap objects (as our BH T ŻO s) with regular mass stellar BHs, massive second generation BHs and stars. Once formed, the BH T ŻO s will first bind in binaries with stars.…”

Section: Introductionmentioning

confidence: 99%

“…At the same time since these new binaries are surrounded by stars, binary-single star interactions will take place resulting in the loose binaries breaking up and the hard ones becoming even tighter. In [25], all those interactions are included for a sequence of the observed globular cluster systems, taking into account their environmental parameters (densities and velocity distribution profiles). We implement the same code in this work taking all the observed Milky Way clusters as reference in order to evaluate a merger rate between low mass gap BH T ŻO and BHs in the regular mass range.…”

Section: Introductionmentioning

confidence: 99%

“…Following [26], we can also evaluate the tidal radius r t of nuclear star clusters hosted by galaxies of given stellar mass. Taking all these clusters to have the same concentration parameter c of 0.7, where c = log 10 (r t /r c ) and r c is the core radius where all BHs reside, and using the numerical code of [25] we can evaluate the rate by which BH-BH T ŻO merger events take place in a nuclear star cluster hosted by a galaxy of given stellar mass. Properly weighting with the Schechter mass function for local galaxies in Eq.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Can Thorne-$\dot{\textrm{Z}}$ytkow Objects source GW190814-type events?

Cholis,

Kritos,

Garfinkle

2021

Preprint

Self Cite

View full text Add to dashboard Cite

The LIGO-Virgo collaboration reported in their third run the coalescence event GW190814 involving a 2.6 M object with a 23 M black hole. In this letter we study the conditions under which Thorne-Żytkow objects (T ŻOs) can be connected to that type of events. We evaluate first the rate of appearance of T ŻOs in the local Universe. Under the assumption that T ŻOs eventually become low mass gap black holes we evaluate how those black holes end up in binaries with other stellar mass black holes and compare to the reported rate for GW190814-type of events (1-23 Gpc −3 yr −1 ). We find that T ŻOs in dense stellar clusters can not explain the LIGO-Virgo rate without a T ŻO population in the field providing a dominant contribution. We also find that T ŻOs formed within hierarchical triple systems in the field with the third more distant star being the progenitor of a stellar mass black hole, may be able to give a rate comparable to that of GW190814-type events. In that case, future observations should discover mergers between stellar mass and low mass gap black holes, with the lower mass spanning the entire low mass gap range.

show abstract

“…A parallel numerical investigation of a catalysis-type mechanism in the context of low mass gap object-BH mergers motivated by GW190814 is also under study and it will be presented elsewhere[109].…”

mentioning

confidence: 99%

The Astro-Primordial Black Hole Merger Rates: a Reappraisal

Kritos,

De Luca,

Franciolini

et al. 2020

Preprint

View full text Add to dashboard Cite

Mainly motivated by the recent GW190521 mass gap event which we take as a benchmark point, we critically assess if binaries made of a primordial black hole and a black hole of astrophysical origin may form, merge in stellar clusters and reproduce the LIGO/Virgo detection rate. While two previously studied mechanisms -the direct capture and the three body induced -seem to be inefficient, we propose a new "catalysis" channel based on the idea that a subsequent chain of single-binary and binary-binary exchanges may lead to the formation of a high mass binary pairs and show that it may explain the recent GW190521 event if the local overdensity of primordial black holes in the globular cluster is larger than a few.

show abstract

Black holes merging with low mass gap objects inside globular clusters

Cited by 11 publications

References 82 publications

How to assess the primordial origin of single gravitational-wave events with mass, spin, eccentricity, and deformability measurements

How to assess the primordial origin of single gravitational-wave events with mass, spin, eccentricity, and deformability measurements

Can Thorne-$\dot{\textrm{Z}}$ytkow Objects source GW190814-type events?

The Astro-Primordial Black Hole Merger Rates: a Reappraisal

Contact Info

Product

Resources

About