Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Detection of Black Holes

Detection of Black Holes

Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...

Schwarzschild Radius and Event Horizon

Schwarzschild Radius and Event Horizon

No object with a finite mass can travel faster than the speed of light in a vacuum. This fact has an interesting consequence in the domain of extremely high gravitational fields.
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape...

Reduced Mass Coordinates: Isolated Two-body Problem

Reduced Mass Coordinates: Isolated Two-body Problem

In classical mechanics, the two-body problem is one of the fundamental problems describing the motion of two interacting bodies under gravity or any other central force. When considering the motion of two bodies, one of the most important concepts is the reduced mass coordinates, a quantity that allows the two-body problem to be solved like a single-body problem. In these circumstances, it is assumed that a single body with reduced mass revolves around another body fixed in a position with an...

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...

Gravitation Between Spherically Symmetric Masses

Gravitation Between Spherically Symmetric Masses

The gravitational potential energy between two spherically symmetric bodies can be calculated from the masses and the distance between the bodies, assuming that the center of mass is concentrated at the respective centers of the bodies.

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

A hot and fast ultra-stripped supernova that likely formed a compact neutron star binary.

Science (New York, N.Y.)·2018

Same author

A mixed D1 and D2 antagonist does not replay pattern electroretinogram alterations observed with a selective D2 antagonist in normal humans: relationship with Parkinson's disease pattern electroretinogram alterations.

Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology·1999

Same author

Neuroprotective effects of riluzole: an electrophysiological and histological analysis in an in vitro model of ischemia.

Synapse (New York, N.Y.)·1999

Same author

Electrophysiological recordings and calcium measurements in striatal large aspiny interneurons in response to combined O2/glucose deprivation.

Journal of neurophysiology·1999

Same author

Orbital pseudotumor: case report and literature review.

Tumori·1999

Same author

Activation of M1-like muscarinic receptors is required for the induction of corticostriatal LTP.

Neuropharmacology·1999

Search research articles

Related Experiment Video

Updated: Apr 27, 2026

Setting Limits on Supersymmetry Using Simplified Models

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

A close-pair binary in a distant triple supermassive black hole system.

R P Deane¹, Z Paragi², M J Jarvis³

¹1] Astrophysics, Cosmology and Gravity Centre, Department of Astronomy, University of Cape Town, Rondebosch, 7701, Cape Town, South Africa [2] Square Kilometre Array South Africa, Pinelands, 7405, Cape Town, South Africa.

|July 4, 2014

Summary

This summary is machine-generated.

Astronomers discovered a triple supermassive black hole system with a uniquely close pair of black holes. This finding suggests compact black hole systems are more common than previously thought, impacting gravitational wave research.

More Related Videos

Operation of the Collaborative Composite Manufacturing CCM System

Operation of the Collaborative Composite Manufacturing CCM System

Published on: October 1, 2019

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

Related Experiment Videos

Last Updated: Apr 27, 2026

Setting Limits on Supersymmetry Using Simplified Models

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

Operation of the Collaborative Composite Manufacturing CCM System

Operation of the Collaborative Composite Manufacturing CCM System

Published on: October 1, 2019

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

Area of Science:

Astrophysics
Cosmology
Black Hole Physics

Background:

Galactic evolution suggests mergers should create multiple supermassive black holes.
Previously known triple black hole systems have wide separations, far outside gravitational influence.
Searches for compact black hole binaries indicated they are rare.

Purpose of the Study:

To report the discovery of a compact triple black hole system.
To investigate the implications of compact black hole systems for galactic evolution and gravitational wave astronomy.

Main Methods:

Observations of a triple black hole system at redshift z = 0.39.
Analysis of radio jet structures for helical modulations.

Main Results:

A triple black hole system was identified with the closest pair separated by approximately 140 parsecs.
The tight pair induces a helical modulation in the large-scale radio jets.
This helical signature offers a novel method for detecting compact binary black holes.

Conclusions:

Compact binary and triple black hole systems are likely more common than previously estimated.
The discovery provides crucial observational constraints for low-frequency gravitational wave experiments.
The helical jet modulation serves as a valuable tool for future searches for compact black hole binaries.