Search for galaxies with active nuclei

Search for galaxies with active nuclei

Image of the galaxy from the Hubble Space Telescope. Found by Spitzer IRC IR Camera May be variable because it holds the active galactic core (AGN). IRAC study for the decade revealed approximately 800 previously unknown AGNs

At the centers of most galaxies reside supermassive black holes with millions and billions of masses of solar material. The material near such holes can get on the dust or gas around the black hole. When this is emitted light throughout the spectrum. Such active galactic nuclei (AGN) are considered to be among the most interesting phenomena of extragalactic astronomy.

AGNs play an important role in galactic evolution, so they are trying to study them. They are located at great distances and belong to the early universe epoch, somewhere in 10 billion years after the Big Bang. But at such a distance they seem weak, which is why it is difficult to find. Recently, scientists decided to use deep infrared-extra-galactic surveys from a 14-year study of the IRAC instrument on the Spitzer space telescope to search for AGN. Numerous observations allow identifying variable sources. Almost 1000 galaxies with variable infrared variation (1% of all registered) were found in the archives. The analysis shows that approximately 80% of them are considered AGN, while others are false or supernovae.

Variability was not recorded in studies on other waves due to severe weakness of X-rays. The infrared beam is able to pass through the fog dust. The team investigated the Hubble images and found that the majority were demonstrating a violation, possibly due to galactic collisions.

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