Akn 564

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Akn 564
Observation data
Redshift 0.024
Distance 368 mly
Characteristics
Type Seyfert galaxy
Notable featuresNitrogen-loud

Akn 564 is a Seyfert galaxy located around 113 megaparsecs from Earth, notable for being a nitrogen-loud galaxy and the closest of its type located in the local universe. Due to its proximity, it is able to be well-studied. Its proximity also allows it to serve as a close local analog for more distant nitrogen enriched galaxies. [1] It also has a rich Iron abundance and a hot intercloud medium. [2]

Contents

Spectra

This galaxy has a complex X-ray spectrum and X-ray light curves of this galaxy show rapid variability but there is no evidence for energy-dependence to these variations. [2]

Nitrogen

There were prominent [N iv] λ1486 and [N iii] λ1750 emission lines detected through ultraviolet (UV) spectra by using the Hubble Space Telescope (HST). This means that nitrogen is abundant in the gas of the galaxy. The nitrogen abundance seen in Akn 564 is not unique as nitrogen enhancement has been reported in HS 0837+4717, GS3073, CEERS-1019, GN-z11 and etc. [1]

Other elements

Akn 564 also has a high metallicity with an extreme abundance of iron with a broad and asymmetric Fe Ka line. [2] It also has a high nickel abundance, meaning the galaxy has highly ionized gas. [3]

References

  1. 1 2 Yang, Chenwei; Liu, Bo; Jiang, Peng; Shi, Xiheng; Zhou, Yipeng; Zhao, Yaqi; Zhou, Xingyu; Pan, Xiang; Zhou, Hongyan (2025-12-11). "A Close Look at the Closest Nitrogen-loud Active Galaxy Akn 564". The Astrophysical Journal Letters. 995 (2): L44. Bibcode:2025ApJ...995L..44Y. doi: 10.3847/2041-8213/ae25f1 . ISSN   2041-8205.
  2. 1 2 3 Turner, T. J.; George, I. M.; Netzer, Hagai (1999-06-17), "Arakelian 564: An Unusual Component in the X-Ray Spectra of Narrow-Line Seyfert 1 Galaxies", The Astrophysical Journal, 526 (1): 52–59, arXiv: astro-ph/9906294 , Bibcode:1999ApJ...526...52T, doi:10.1086/307995, arXiv:astro-ph/9906294
  3. ↑ "Abstract: Multiwavelength Monitoring of the Narrow-Line Seyfert 1 Galaxy Akn 564. I. ASCA Observations and the Variability of the X-ray Spectral Components". www.asc.ohio-state.edu. Retrieved 2025-12-15.


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