WebbThe close relationship between period and luminosity which was found by Henrietta S. Leavitt in 1912 has given Cepheids a unique role in establishing the distances of the nearer galaxies and hence the distance scale of the universe. WebbWe investigate the role of galaxy mergers in triggering active galactic nuclei (AGN) in the nearby universe. Our analysis is based on a sample of 79 post-merger remnant galaxies with deep X-ray observations from Chandra/XMM-Newton capable of detecting a low-luminosity AGN of ≥10 40.5 erg s −1.This sample is derived from a visually classified, …
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Comparing the Period-Luminosity relationships in variable stars
WebbIn 1912 Leavitt had found that there was a close correlation between the periods of pulsation (variations in light) and the luminosities (intrinsic, or absolute, brightnesses) … WebbWhen properly callibrated, this leads to a "period-luminosity relationship," and if we know the star's intrinsic luminosity, we can infer its distance by observing its apparent brightness. So variable stars are distance indicators, and indeed Hubble used Cepheids to determine that Andromeda was so far it had to be its own galaxy, and to determine the … WebbActes du colloque de Téhéran xv . Plant-water relationships in arid ... Humidity control 284 Control of the C 0 2 concentration 284 Attached versus excised branches or leaves 284 Induction period 284 Calibration of the infra-red analyser 285 Combination of infra-red ... Curve 9 (X) represents the stan- dard spectral luminosity ... cute angry kitten