NGC 7456
Galaxy in the constellation Grus
NGC 7456 is a spiral galaxy in the constellation of Grus. Its velocity with respect to the cosmic microwave background is 944±18 km/s, which corresponds to a Hubble distance of 45.4 ± 3.3 Mly (13.92 ± 1.01 Mpc). Additionally, 23 non-redshift measurements give a farther mean distance of 50.33 ± 2.11 Mly (15.430 ± 0.648 Mpc). It was discovered by British astronomer John Herschel on 4 September 1834.
NGC 7456 is a Seyfert II galaxy, i.e. it has a quasar-like nucleus with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, the host galaxy is clearly detectable.
01X-ray sources
NGC 7456 contains as many as five ultraluminous X-ray sources. ULX-1 exhibits pronounced variability, with its flux changing over intervals ranging from several hundred seconds to a few kiloseconds, representing one of the most extreme flux fluctuations recorded among ULXs. Two of the five sources are considered transient ULX candidates.
02LDC 1547 group
Sources and credits
This article is adapted from the Wikipedia article “NGC 7456”, written by its contributors and licensed under CC BY-SA 4.0. Fathomly has changed the layout, removed citation markers, navigation and maintenance notices, and adjusted punctuation. This adapted version is shared under the same license. For references, see the original article.
Images, from Wikimedia Commons:
- A galaxy with lots to see (potw2535a).jpg by ESA/Hubble & NASA, D. Thilker, CC BY 4.0
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