Cosmic clocks: a tight radius–velocity relationship for H i-selected galaxies
Cosmic clocks: a tight radius–velocity relationship for H i-selected galaxies
H i-selected galaxies obey a linear relationship between their maximum detected radius Rmax and rotational velocity. This result covers measurements in the optical, ultraviolet, and H i emission in galaxies spanning a factor of 30 in size and velocity, from small dwarf irregulars to the largest spirals. Hence, galaxies behave …