Friday, January 06, 2017

Abell 3411 and 3412: Astronomers Discover Powerful Cosmic Double Whammy

  Abell 3411 and Abell 3412 
(Credit: X-ray: NASA/CXC/SAO/R. van Weeren et al;
 Optical: NAOJ/Subaru; Radio: NCRA/TIFR/GMRT)


Using data from NASA's Chandra X-ray Observatory and several other telescopes, astronomers have discovered a cosmic one-two punch unlike any ever seen in a pair of colliding galaxy clusters called Abell 3411 and Abell 3412. This result, described in our latest press release, shows that an eruption from a supermassive black hole combined with a galaxy cluster merger can create a stupendous cosmic particle accelerator.

This composite image contains X-rays from Chandra (blue) that reveals diffuse emission from multi-million-degree gas in the two clusters. The comet-shaped appearance of the hot gas provides clear evidence that the two clusters are colliding and merging. The "head" of the comet is hot gas from one cluster plowing through the hot gas of the other cluster, in the direction shown by the arrow in the labeled image.

Radio emission detected by the Giant Metrewave Radio Telescope in India (red) represents colossal shock waves — cosmic versions of sonic booms generated by supersonic aircraft — produced by the collision of the hot gas associated with the galaxy clusters. Optical data from the Subaru telescope atop Mauna Kea, Hawaii, shows galaxies and stars with a range of different colors.

This new image also shows three different supermassive black holes in galaxies located in the merging clusters. The upper one shows that a jet powered by a supermassive black hole is connected to large swirls of radio emission. The team of astronomers thinks this connection provides important information about how the radio emission was produced.

This spinning, supermassive black hole is producing a rotating, tightly-wound magnetic funnel. The powerful electromagnetic fields associated with this structure have accelerated some of the inflowing gas away from the vicinity of the black hole in the form of an energetic, high-speed jet. Then, these accelerated particles in the jet were accelerated again when they encountered the shock waves from the galaxy cluster collision.

Jets from the two other supermassive black holes (see labeled version of image) are likely having the same effect of accelerating particles before they get a second boost from the shock waves. The jets from one of the black holes are too short to be seen in the labeled image.

These results were presented at the 229th meeting of the American Astronomical Society meeting in Grapevine, TX. They were also described in a paper, led by Reinout van Weeren of the Harvard-Smithsonian Center for Astrophysics, which appeared in the inaugural issue of the journal Nature Astronomy on January 4, 2017.

NASA's Marshall Space Flight Center in Huntsville, Alabama, manages the Chandra program for NASA's Science Mission Directorate in Washington. The Smithsonian Astrophysical Observatory in Cambridge, Massachusetts, controls Chandra's science and flight operations.

Fast Facts for Abell 3411 and 3412:

Scale: Image is 17 arcmin across (about 8.15 light years)
Category: Groups & Clusters of Galaxies, Black Holes
Coordinates (J2000): RA 08h 41m 47.69s | Dec -17° 28' 45.84"
Constellation: Hydra
Observation Date: 26 Jan 2006
Observation Time: 45 hours 46 min
Obs. ID: 17193, 17496, 17497, 17583-17585
Instrument: ACIS
References: van Weeren, R. et al, 2017, Nature Astronomy
Color Code: X-ray (Blue), Optical (Red, Green, Blue), Radio (Pink)
Distance Estimate: About 2 billion light years