The ISM: stuff between the stars (Faint Gas around the Horsehead Nebula)
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Transcript of The ISM: stuff between the stars (Faint Gas around the Horsehead Nebula)
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The ISM: stuff between the stars
(Faint Gas around the Horsehead Nebula)
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Interstellar Medium
Many “inter-media” :i. Interplanetary – space between
planetsii.Interstellar – space between starsiii.Intergalactic – space between
galaxies
This “space” is NOT a vacuum, although in some cases it isn’t far!
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Solar Motion thru the ISM
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ISM Components• ISM is very inhomogeneous, with multiple components
T(K) n(cm-3)Fill Factor
Clouds:
H2
15 200 0.1%
HII
8000 15 0.1%
HI
120 25 2%
Intercloud:
Warm HI
8000 0.3 40%
Warm HII
8000 0.15 20%
Hot HII
106 2x10-3 40%
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Our Local Interstellar Medium
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Panning Out a Bit …
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Nebulae
Clouds of gas and/or dust
• Emission Neb. – reddish1. HII regions2. Planetary Nebulae (PNe)3. SN Remnants
• Reflection Neb. – bluish• Dark Neb. – blocks light from more
distant stars
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Reflection and Emission Nebulae
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Another Example of Colors
Absence of stars here implies what?
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Dark Nebula
Saw this same image in relation to extinction issues
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DUST: Turns out that dust plays an important role in astronomy. It has strong extinction properties, represents complex chemistry, and is a source of infrared radiation. Here is an example of different dust types, in this case in the disk of a B supergiant star.
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Cold Gaseous Columns
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Star Formation “Nests”
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Stellar Recycling - Wind Ejecta
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Another Example: Mira (seen by GALEX)
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Wind-Blown Bubbles in the LMC
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Crab Nebula - A Supernova Remnant
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HII Region - The Rosette Nebula
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Planetary Nebula
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Planetary Nebulae are Solar Endpoints
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More Planetary Nebulae(HST)
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A Pretty One: The Boomerang
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Example of Faint Extended Structur
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