The dark cloud B68 at different wavelengths

B68 is a dark cloud situated at a distance of about 500 light-years (160 pc) towards the southern constellation Ophiuchus (The Serpent-holder). This image represents the sky area of the so-called Bok globule Barnard 68 --- nicknamed the Dark Cloud -- imaged in six different wavebands, clockwise from the blue to the near-infrared spectral region. Three of these frames ("blue" B-band at wavelength 440 nm = 0.44 µm; "green-yellow" V-band at 0.55 µm; near-infrared I-band at 0.90 µm) were obtained with the FORS1 instrument at the VLT ANTU telescope and three with SOFI at the NTT through near-infrared filters (J-band at 1.25 µm; H-band at 1.65 µm; Ks-band at 2.16 µm). It is evident that the obscuration caused by the cloud diminishes dramatically with increasing wavelength. Since the outer regions of the cloud are less dense than the inner ones, the apparent size of the cloud also decreases, as more background stars shine through the outer parts. Each frame covers an area of 4.9 x 4.9 arcmin 2. North is up and East is left.

Kilde:

ESO

Om bildet

ID:eso9934b
Type:Observasjon
Publiseringsdato:2. juli 1999
Relaterte pressemeldinger:eso9934
Størrelse:3727 x 2480 px

Om objektet

Navn:B 68, Barnard 68
Type:Milky Way : Nebula : Appearance : Dark : Molecular Cloud
Milky Way : Nebula : Appearance : Dark : Bok Globule
Avstand:500 lysår
Kategori:Nebulae

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Farger og filtre

BåndBølgelengdeTeleskop
Optisk
B
440 nmVery Large Telescope
FORS1
Optisk
V
550 nmVery Large Telescope
FORS1
Infrarødt
I
900 nmVery Large Telescope
FORS1
Infrarødt
J
1.25 μmNew Technology Telescope
SOFI
Infrarødt
H
1.65 μmNew Technology Telescope
SOFI
Infrarødt
K
2.16 μmNew Technology Telescope
SOFI

 

Se også