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Gas and mm Dust emission François Boulanger et Guilaine Lagache (Institut d Astrophysique Spatiale, Orsay) Tracing diffuse ISM components in te Solar Neighborhood.

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Presentation on theme: "Gas and mm Dust emission François Boulanger et Guilaine Lagache (Institut d Astrophysique Spatiale, Orsay) Tracing diffuse ISM components in te Solar Neighborhood."— Presentation transcript:

1 Gas and mm Dust emission François Boulanger et Guilaine Lagache (Institut d Astrophysique Spatiale, Orsay) Tracing diffuse ISM components in te Solar Neighborhood and across the Galaxy with mm dust emission mm dust properties across the HI/H2 transition

2 Gas Tracers Diffuse H II : Pulsar dispersion measure H I : 21 cm Line > Misses cold H I H 2 : CO low J rotational lines > several caveats: optical thickness, CO photo-dissociation > Misses « diffuse » H2 (seen in absorption and in gamma rays) Dust : H I and H 2 > Extinction: clumping > Far-IR emission per dust mass is temperature dependent > mm dust emission: Matter Tracer Galaxies and star forming cores (ground telescopes) diffuse ISM Dust emissivity: How constant across the HII/HI/Diffuse H2/CO transitions?

3 IR-HI Correlation at 1.2mm FIRAS + HI all-sky survey

4 Molecular Gas

5 Longitude Profile

6 HI/H2 Transition Solar Neighorhood H2 self-shielding: HI H2 pour NH> H/cm 2 Savage et al. 1977


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