... The smallest H/H emission ratio, 2.52.7 (Burgess 1958), is obtained in the case of hydrogen excitation (ionization) by ultraviolet radiation from young massivestars (H II-region-type excitation). ...
... This e+ect is important for stars more massive than 1.6 or for stellar systems M _ younger than 4х5 Gyr (Maeder & Meynet 1991), and there fore is important for the nucleus of NGC 7280. ...
... of gas excitation; for example, the lowest ratio I (H )/I (H ), 2.5, is for the gas excitation by young massivestars (Burgess 1958), while shock excitation and excitation by power-law continuum (by active galactic nuclei (AGNs)) give a higher I (H )/I (H ...
... variations of the central line-of-sight velocity gradients by a cosine law, we can check the axisymmetry of the mass (star?) distribution and determine the orientation of the kinematical major axis by its phase and the central angular rotation velocity by ...
... As a result, massive bursts of star formation are expected exactly is in the central kiloparsec, which should lead to the ... a massive fallout ( ???) of dwarf companions on it, and this would supply the matter for a nuclear burst of star formation ...
... it simultaneously in three directions: they heat and thicken the stellar disk making spiral arms weaker, they drop their stars into the center increasing the bulge mass, and they reform the bulge exp onential brightness profile into a more steep er one ...
... star formation at the galactic center to facilitate the growth of the bulge, which is, on average, more prominent in ... several dozen members, and in one of them--NGC 83--we found earlier signs of a massive disk and intense current star formation ...