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- Luminosity_distance abstract "Luminosity distance DL is defined in terms of the relationship between the absolute magnitude M and apparent magnitude m of an astronomical object.which gives:where DL is measured in parsecs. For nearby objects (say, in the Milky Way) the luminosity distance gives a good approximation to the natural notion of distance in Euclidean space.The relation is less clear for distant objects like quasars far beyond the Milky Way since the apparent magnitude is affected by spacetime curvature, redshift, and time dilation. Calculating the relation between the apparent and actual luminosity of an object requires taking all of these factors into account. The object's actual luminosity is determined using the inverse-square law and the proportions of the object's apparent distance and luminosity distance.Another way to express the luminosity distance is through the flux-luminosity relationship. Since,where F is flux (W·cm−2), and L is luminosity (W), or where F is flux (erg·s−1·cm−2), and L is luminosity (erg·s−1). From this the luminosity distance can be expressed as:The luminosity distance is related to the "comoving transverse distance" by the Etherington's reciprocity relation[citation needed]:where z is the redshift. is a factor that allows you to calculate the comoving distance between two objects with the same redshift but at different positions of the sky; if the two objects are separated by an angle , the comoving distance between them would be . In a spatially flat universe, the comoving transverse distance is exactly equal to the radial comoving distance , i.e. the comoving distance from ourselves to the object.".
- Luminosity_distance wikiPageExternalLink icosmos.co.uk.
- Luminosity_distance wikiPageExternalLink CosmoCalc.html.
- Luminosity_distance wikiPageID "3166203".
- Luminosity_distance wikiPageRevisionID "598761802".
- Luminosity_distance hasPhotoCollection Luminosity_distance.
- Luminosity_distance subject Category:Observational_astronomy.
- Luminosity_distance subject Category:Physical_quantities.
- Luminosity_distance type Abstraction100002137.
- Luminosity_distance type Measure100033615.
- Luminosity_distance type PhysicalQuantities.
- Luminosity_distance comment "Luminosity distance DL is defined in terms of the relationship between the absolute magnitude M and apparent magnitude m of an astronomical object.which gives:where DL is measured in parsecs.".
- Luminosity_distance label "Distance de luminosité".
- Luminosity_distance label "Distanza di luminosità".
- Luminosity_distance label "Leuchtkraftentfernung".
- Luminosity_distance label "Luminosity distance".
- Luminosity_distance label "Odległość jasnościowa".
- Luminosity_distance label "光度距離".
- Luminosity_distance label "光度距離".
- Luminosity_distance sameAs Leuchtkraftentfernung.
- Luminosity_distance sameAs Distance_de_luminosité.
- Luminosity_distance sameAs Distanza_di_luminosità.
- Luminosity_distance sameAs 光度距離.
- Luminosity_distance sameAs Odległość_jasnościowa.
- Luminosity_distance sameAs m.08wl_x.
- Luminosity_distance sameAs Q1821402.
- Luminosity_distance sameAs Q1821402.
- Luminosity_distance sameAs Luminosity_distance.
- Luminosity_distance wasDerivedFrom Luminosity_distance?oldid=598761802.
- Luminosity_distance isPrimaryTopicOf Luminosity_distance.