"luminous rays" is correct and usable in written English.
You can use it to describe a scene, especially one that has a lot of brightness from the sun, moon, stars, or other sources of light. For example: "The night sky was lit up by luminous rays from the full moon."
Upon application of a tension of ∼60 V, the contact angle changes, the radius of curvature is modified, the luminous rays are focused (Fig. 22b).
Later, in 1889, Johan Widmark proved that it was mainly the ultraviolet rays, rather than luminous rays, that caused the redness of sunburned skin.
The determination of fundamental parameters in X-ray luminous (persistent) X-ray binaries has been classically hampered by the large optical luminosity of the accretion disc.
At z = 0.105, GRB 031203 is one of the least luminous γ-ray bursts, with an equivalent isotropic γ-ray energy of ∼3 × 1049 ergs.
Clarke told me that when the ego chamber is fully decorated the walls will reflect a luminous white ray of pure and undiluted ego — a ray of such intensity that any transient droplet of self-doubt that happens by will be consumed as if by a laser beam.
Stellar mass black holes in the Galaxy have all been first detected by their luminous X-ray emission -- either as very bright persistent emission in black hole high mass X-ray binaries (BH-HMXBs), as epitomized by Cyg X-1, or as very luminous (but rare) outbursts of black holes accreting from low mass companions (BH-LMXBs), as first discovered by McClintock and Remillard (1986) for A0620-00.
Actively accreting SMBHs are found, nearly universally, to create luminous X-ray emission.
Soderberg, A. M. et al. An extremely luminous X-ray outburst at the birth of a supernova.
Feb 22 Franz An Extremely Luminous X-ray Outburst Marking the Birth of a Normal Supernova What are the odds?
In five of these blobs, the Chandra data revealed the telltale signature of growing supermassive black holes - a point-like source with luminous X- ray emission.
Common suspects for the mechanism that powers the most luminous X-ray stellar sources, are super-Eddington accretion, beaming and sub-Eddington accretion on intermediate-mass black holes.
