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 la imagen

Fecha de publicación:6 de Junio de 2011 a las 15:30
Anuncios relacionados:ann11031
Tamaño:689 x 2411 px

Sobre el objeto

Nombre:3C 273
Tipo:Early Universe : Galaxy : Activity : AGN : Quasar
Distancia:z=0.158 (desplazamiento al rojo)
Quasars and Black Holes

Formatos de imagen

JPEG grande
777,9 KB

Colores y filtros

BandaLongitud de ondaTelescopio
2.17 μmVery Large Telescope Interferometer

Exposure time: 5s