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.

X-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.

LDC 1547 group

NGC 7456 is a member of the LDC 1547 galaxy group, which contains 16 galaxies, including NGC 7404[fr], NGC 7410, NGC 7418, NGC 7421, NGC 7424, NGC 7462[fr], IC 1459, IC 5264[fr], IC 5269[fr], IC 5270[fr], IC 5271[fr], IC 5273[fr], and 3 galaxies from the ESO Catalogue.

Image gallery

See also

External links

  • Media related to NGC 7456 at Wikimedia Commons
  • NGC 7456 on WikiSky: , , , , , , , ,