Spectator tagging with EIC: Physics and experimental requirements

Finding the distances to star-formation re-gions is required to determine their lumi-nosities, masses, and sizes, and the ages of the young stars Measuring the 3-D ve-locities and distances of regions through-out the Milky Way is required to deter-mine the rotation curve to measure the dark matter mass of the Galaxy, to delin-

DISTANCES AT MODERATE REDSHIFT - Particle Physics and

Distances measured in this way are called luminosity distances and given the symbol dL The distances measured using Type Ia supernovae are luminosity distances 2 Standard ruler methods In these methods, we measure the angular size of something whose linear size we think we know Angular sizes in astronomy are always small, so we use

National Aeronautics and Space Administration Age of the

brighter than the Cepheids He uses these lumi nous stars as standard candles for more distant objects But today’s telescopes, and the stars they see, will only take Hubble so far To measure even greater distances, astronomers will need a larger telescope and new types of standard candles One new instrument may hold the key Last

q A measurement of the Hubble constant from angular diameter

measure angular diameter distances to strong gravitational lenses We apply it to two exam-ples at redshift z ¼ 0:295and0:6304 with time-varying source brightness Our goal is to use the two absolute distances to anchor the relative distances of SNe, constrainingH 0 Ifwecan determine the absolute distances to z ¼ 0:295