Galaxs

Galaxs are a proposed class of cosmic structures that are intermediate between the largest star clusters and the smallest full-fledged galaxies in some models of structure formation. The term appears in speculative literature and discussions of low-mass systems in the early universe, but it is not part of standard astronomical catalogs or classifications.

Characteristics of galaxs are described in theoretical contexts as having properties between those of star clusters and dwarf or low-mass galaxies. They are often imagined with masses roughly in the range 10^7 to 10^9 solar masses and sizes of about 0.5 to a few kiloparsecs. Their surface brightness is typically low, and they may host multiple stellar populations. In some formulations, galaxs possess dark matter halos and show low to modest levels of ongoing star formation, while in others they appear largely quiescent.

Formation and evolution hypotheses for galaxs include origins as remnants of primordial density fluctuations that failed to develop into full galaxies, or as products of tidal interactions that create loosely bound, galaxy-like systems. They may also represent “failed” galaxies whose feedback processes inhibited further growth, or transitional objects in hierarchical assembly scenarios.

Observational status remains unsettled. There are no definitive detections labeled as galaxs in major surveys, and some candidates may be classified as ultra-diffuse galaxies or other diffuse systems. Distinguishing galaxs from related objects is observationally challenging and often requires deep imaging and spectroscopic data.

See also: ultra-diffuse galaxy, dwarf galaxy, proto-galaxy.