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Discovery of a Dying Supermassive Black Hole by Accident – Via a 3,000-Year-Long Light Echo - SciTechDaily

Discovery of a Dying Supermassive Black Hole by Accident – Via a 3,000-Year-Long Light Echo - SciTechDaily

Discovery of a Dying Supermassive Black Hole by Accident – Via a 3,000-Year-Long Light Echo - SciTechDaily
Jun 10, 2021 1 min, 0 secs

The radio band composite image of Arp 187 obtained by VLA and ALMA telescopes (blue: VLA 4.86 GHz, green: VLA 8.44 GHz, red: ALMA 133 GHz).

The image shows clear bimodal jet lobes, but the central nucleus (center of the image) is dark/non-detection.

Through observing the radio images in the galaxy using two astronomy observatories – the Atacama Large Millimeter/submillimeter Array (ALMA) and the Very Large Array (VLA) – they found a jet lobe, a hallmark sign of AGN.

In the dying AGN, the nucleus is very faint in any wavelength bands because the AGN activity is already dead, while the extended ionized region is still visible for ~3,000 light years since it takes ~3,000 years for the light to cross the extended region.

But the large scale ionized gas region is still visible since it takes about 3000 years for photons to arrive at the region’s edge.

The findings indicate AGN turn-off occurs within a 3000-year time scale, and the nucleus becomes over 1000 times fainter during the last 3000 years.

A galaxy in which the nucleus has ceased to exist breaks out of its orbit around the Center of Our Universe and is bound to collide with a neighboring galaxy

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