ESO 534-021 – very close and bright high redshift companion

Projected very close to ESO 534-021 is higher redshift galaxy ESO-LV 5340211. There seem to be no obvious signs of interaction. It should be noted that further out (at 4.8 and 5.7 angular separation from ESO 534-021) there are two galaxies at similar redshift as ESO-LV 5340211.

One noteworthy thing about this system is that ESO-LV 5340211 is brighter than ESO 534-021 although ESO-LV 5340211 has about 6 times higher redshift (and therefore should be 6 times farther from us than ESO 534-021). I queried NED for galaxies between redshifts 18016 and 18216 (+/- 100 km/s from the redshift of ESO-LV 5340211). From resulting set of galaxies 1942 had nominal magnitude data (apparently) at same band as ESO-LV 5340211. Apparent magnitude of ESO-LV 5340211 is 14.66. Average apparent magnitude of the 1942 galaxies is 17.73. Standard deviation of the apparent magnitude of 1942 galaxies is 1.15. The apparent magnitude of ESO-LV 5340211 therefore deviates by about 2.7 sigmas from the mean apparent magnitude of the galaxies at its redshift.

It should be noted that of the 1942 galaxies, ESO-LV 5340211 is not brightest even if it is among the brightest. There are 13 galaxies that are brighter than ESO-LV 5340211. I checked the 13 galaxies and in one system (2MFGC 12636) there was similar situation that the high redshift galaxy was clearly brighter than nearby lower redshift galaxy. This is perhaps something to study in near future.

ESO534_021
Figure 1. The objects with measured redshifts near ESO 534-021. Size of the image is 5 x 5 arcmin. Image is from Digitized Sky Survey.

Objects and their data

NBR NAME TYPE REDSHIFT MAG SEPARATION
1 ESO 534-021 Sc 0.010474 (3140 km/s) 15.48 0
2 ESO-LV 5340211 galaxy 0.060428 (18116 km/s) 14.66 0.269

NED objects within 10′ from ESO 534-021

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