Lyman alpha emitter

Lyman alpha emitter

Lyman alpha emitters (LAEs) are a type of distant galaxy that emits Lyman alpha radiation. They are extremely distant and becauce of the finite travel time of light they are glimpses of the past history of the universe. They are thought to be the progenitors of most modern Milky Way like galaxies. These galaxies can be found nowadays rather easily in narrow-band searches by an excess of their narrow-band flux at a wavelength which may be interpreted as their redshift: z= lambda } over {1215.67-1 . Where z is the redshift, lambda is the observed wavelength, and 1215.67 is the wavelength in Angstroms of Lyman alpha emission. The Lyman alpha line is thought to be caused by an ongoing outburst of star-formation. Experimental observations of the redshift of LAEs are important in cosmology because they trace dark matter halos and subsequently the evolution of matter distribution in the universe.

See also

* Lyman series
* Lyman-break galaxy
* Lyman-alpha forest
* Lyman limit system


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • Lyman-Alpha-Emitter — Als Lyman Alpha Emitter (LAE), auch Lyα Emitter, wird eine Klasse extragalaktischer Objekte bezeichnet, die aufgrund ihrer Strahlungsemission in der Lyman α Emissionslinie, einer Spektrallinie des Wasserstoffs, gefunden werden. Derzeit sind über… …   Deutsch Wikipedia

  • Damped Lyman-alpha system — Damped Lyman alpha systems or Damped Lyman alpha absorption systems are gaseous objects in the universe detected in the spectra of quasars, with a column density larger than 1020 atoms/cm2.[1][2] The observed spectra consist of neutral hydrogen… …   Wikipedia

  • Émetteur Lyman-alpha — Les émetteurs lyman alpha (LAE pour Lyman Alpha Emitter en anglais) sont des galaxies présentant une raie lyman alpha en émission. La raie lyman alpha est produite par recombinaison de l hydrogène ionisé et correspond à la transition électronique …   Wikipédia en Français

  • Himiko (Astronomie) — Datenbanklinks zu Himiko Himiko ist ein astronomisches Objekt in einer Entfernung von 12,9 Milliarden Lichtjahren, das 2007 von Masami Ouchi mit dem Subaru Teleskop auf Hawaii entdeckt und bis April 2009 als ein Lyman Alpha Emitter identifiziert… …   Deutsch Wikipedia

  • Outline of astronomy — Mauna Kea in Hawaii is one of the world s premier observatory sites. Pictured is the W. M. Keck Observatory, an optical interferometer. The following outline is provided as an overview of and topical guide to astronomy: Astronomy – studies the… …   Wikipedia

  • LAE — ist die Abkürzung für: Flughafen Lae Nadzab in Papua Neuguinea (IATA Code) Leseranalyse Entscheidungsträger in Wirtschaft und Verwaltung, Markt Media Studie Lungenarterienembolie, (auch Lungeninfarkt) Lyman Alpha Emitter, eine Klasse… …   Deutsch Wikipedia

  • LAE — Loss Adjustment Expenses (Business » Accounting) ** Lae, Papua New Guinea (Regional » Airport Codes) * Left Atrial Enlargement (Medical » Physiology) * Licenciado en Administración de Empresas (International » Spanish) * Louisiana Association of… …   Abbreviations dictionary

  • LAE — abbr. Lyman Alpha Emitter …   Dictionary of abbreviations

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”