Might mean (unverified): Emitting exceptionally high levels of light.
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We found 2 dictionaries that define the word ultraluminous:

General (2 matching dictionaries)
  1. ultraluminous: Merriam-Webster
  2. ultraluminous: Wiktionary

Definitions from Wiktionary (ultraluminous)

adjective:  Very luminous
adjective:  (astronomy) Very luminous, though less luminous than that classified as hyperluminous.
adjective:  Having a luminosity near below, at, or, exceeding Eddington luminosity, exceeding the Eddington limit

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