angular diameter distance造句

• For extragalactic lenses, these must be angular diameter distances.
• The distance measured by a standard ruler is what is known as the angular diameter distance.
• Occasionally, the symbols \ chi or r are used to denote both the comoving and the angular diameter distance.
• Angular diameter distances to the lenses and background sources are important for converting the lensing observables to physically meaningful quantities.
• Peebles ( 1993 ) calls the transverse comoving distance the " angular size distance ", which is not to be mistaken for the angular diameter distance.
• This is related to the angular diameter distance, which is the distance an object is calculated to be at from \ theta and x, assuming the Universe is Euclidean.
• An object of size x at redshift z that appears to have angular size \ delta \ theta has the angular diameter distance of d _ A ( z ) = x / \ delta \ theta.
• In non-Euclidean space, such as our expanding universe, the angular diameter distance is only one of several definitions of distance, so that there can be different " distances " to the same object.
• This signal in the power spectrum can be used as a standard ruler to map out the evolution of the Hubble parameter, H ( z ), and the angular diameter distance d _ A ( z ) with redshift . This in turn constrains the properties of dark energy and other cosmological parameters.
• Note that beyond a certain redshift, the angular diameter distance gets smaller with increasing redshift . In other words, an object " behind " another of the same size, beyond a certain redshift ( roughly z = 1.5 ), appears larger on the sky, and would therefore have a " smaller " " angular diameter distance ".
• Note that beyond a certain redshift, the angular diameter distance gets smaller with increasing redshift . In other words, an object " behind " another of the same size, beyond a certain redshift ( roughly z = 1.5 ), appears larger on the sky, and would therefore have a " smaller " " angular diameter distance ".