Interferometric fringes from an observation of 3C 273 with the VLTI

An interferometric observation of the quasar 3C 273 with the VLTI. The columns marked UT1, UT2, and UT4 show the data from the individual 8.2-metre Unit Telescopes, which were then combined interferometrically. The resultant fringes are shown in the column marked VLTI. The bright feature is the Paschen-α emission line from atomic hydrogen gas, redshifted to a wavelength of 2.17 µm due to the quasar’s distance of about two billion light-years.

This image is a rare example of a five-second exposure that reveals the fringes. In real use, multiple much shorter 0.3-second observations must be made. It is thanks to the new “blind observation mode” that these shorter exposures can be successfully combined.


ESO/A. Merand

Sobre a imagem

Data de divulgação:6 de Junho de 2011 às 15:30
Anúncios relacionados:ann11031
Tamanho:689 x 2411 px

Sobre o objeto

Nome:3C 273
Tipo:Early Universe : Galaxy : Activity : AGN : Quasar
Distância:z=0.158 (desvio para o vermelho)
Quasars and Black Holes

Formatos de imagens

JPEG grande
777,9 KB

Cores e filtros

BandaComprimento de ondaTelescópio
2.17 μmVery Large Telescope Interferometer

Exposure time: 5s