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Press pages | The Lyman Alpha Reference Sample
Press Release I |
Press Release II |
Science Papers |
High Resolution Images
Light and dust in a nearby starburst galaxy
LARS 09, a.k.a. IRAS 08208+2816, a.k.a. SDSS J082354.97+280621.7 in the F336W (blue), F438W (green) and F775W (red). Credit: ESA/Hubble & NASA
Resources
Science Paper
Composite emission line images
Red : Hα.
green : far ultraviolet continuum.
blue : Lymanα.
I.e.: hot ionizing stars are shown in green, and the nebulae they create are
shown in red. Lyα is produced in the same nebulae as the Hα, but
the blue colour that encodes Lyα clearly does resemble that of the red.
This is because Lyα scatters off neutral hydrogen which is very abundant
in and around galaxies, and thus Lyα must find different paths -
sometimes long and complicated ones - through the interstellar medium in
order to escape. Consequently large `haloes' of Lyα are
frequently seen (most clearly in LARS 01, 02, 05, 07, 14) that surround the
star-forming regions of the galaxies.
LARS - the Lyman alpha Reference Sample is an ongoing programme
with the Hubble Space telescope: GO 12310 and 12583.
Click on each one to embiggenate.
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