Spiral Galaxy - Canis Venitici We can only see about 1/6 (ca 6000ly) of the way to the Galctic Centre due to scattering by gas and dust in the disk.

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Presentation transcript:

Spiral Galaxy - Canis Venitici

We can only see about 1/6 (ca 6000ly) of the way to the Galctic Centre due to scattering by gas and dust in the disk

Diffuse Nebula

Attenuation due to scattering by interstellar gas and dust clouds

ν →ν → Rotating binary star system with one dark companion Diffuse interstellar cloud Absorption against the hot background emission exhibits a varying Doppler Shift Absorption of an atom in interstellar cloud unshifted Absorption line of an atom in the cool atmosphere in the spectrum of a star

Multiple Clouds in the Line of Sight Na D Lines Ca Line

Doppler Shifts in Interstellar lines  /  =  / = v/c

Rosette Nebula

Scattering by interstellar Gas and Dust

Hartman 1904 K Ti Fe Ca Na T (100K) BinaryDiffuse cloud

Multiple Clouds in the Line of Sight

Harry Kroto 2004

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