June 9, 2023


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Tight spiral galaxy “NGC 1808” with an active galactic nucleus taken with the Dark Energy Camera | Sorae Portal to the universe

This is barred spiral galaxy NGC 1808, about 40 million light-years away in the direction of Pigeons. A narrow spiral galaxy is a spiral galaxy with a bar-like structure at its center. About half of all spiral galaxies, including our own Milky Way, are thought to have bar-like structures.

【▲ Liquid-Range 「NGC 1808 (Credit: Dark Energy Survey/DOE/FNAL/DECam/CTIO/NOIRLab/NSF/AURA; image processing: R. Colombari and M. Zamani (NSF’s NOIRLab)]

According to the National Institute of Optical and Infrared Astronomy (NOIRLab) of the National Science Foundation (NSF), which released the image, the faint blue ring surrounding NGC 1808’s bright center contains star clusters and supernova remnants. I’m here. Active star formation activity is taking place in this region, and many blue stars that shine at high temperatures are thought to be born. From the outside, slightly distorted spiral arms (helical arms) spread around the interior, giving a soft glow.


In addition, NGC 1808 is known to have an active galactic nucleus (AGN) that emits strong electromagnetic waves from a narrow region at its center. NGC 1808 is classified as a Sv galaxy (Sv type 2), a type of active galaxy. it has been. The driving force behind these AGNs is believed to be a supermassive black hole (supermassive black hole), which is thought to be observed as an AGN by emitting electromagnetic waves of different wavelengths.

According to NOIRLab, NGC 1808’s active galactic nucleus, high activity of star formation, and distorting spiral arms may tell the story of its gravitational interaction with another nearby galaxy, NGC 1792. (NGC 1792 is outside the field of view at the bottom right of the image, so it’s not visible.) here).

The first image was created based on observational data (using visible light and infrared filters) of the Dark Energy Camera (DECam) monitor installed on the Blanco 4m telescope at the Cerro Toloro Inter-American Observatory in Chile. Published by NOIRLab on May 17, 2023. The Dark Energy Camera as its name suggests is an observational device primarily developed to study dark energy. The pixel count is about 520 megapixels, and the area is about 14 times the size of the full moon (3 square degrees.) at one time. Observations for the original purpose of dark energy research were made from 2013 to 2019.



  • Image credit: Dark Energy Survey/DOE/FNAL/DECam/CTIO/NOIRLab/NSF/AURA; Image processing: R. Colombari and M. Zamani (NSF’s NOIRLab)
  • NOIRLab – Many layers of NGC 1808

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