Measurements of the CO-to-H 2 Conversion Factor and Dust-to-Gas ...

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Measuring the Conversion Factor with Dust. DGR = ΣD/(ΣHI +αCOICO) unknown observable • Fix DGR based on some model or expected DGR. • Fix DGR based on nearby HI-only line-of-sight. • Solve for both DGR & α CO using spatially resolved measurements. Assumption: DGR constant on kpc scales.
Our Technique: Minimizing Scatter in DGR on kpc scales cartoon of what happens to DGR when αCO is adjusted DGR = Σdust ΣHI +αCOICO assume DGR & Xco constant in this region ICO/ΣHI • both CO and H I are detected Need good S/N maps of CO & HI. • a range of ICO/ΣHI values are present Need many resolution elements. • region is small, ok to assume DGR & Xco ~ constant Must select small chunk of galaxy, so need high resolution.
Page 1 and 2: Measurements of the CO-to-H2 Conver
Page 3 and 4: Other ways to trace the total amoun
Page 5 and 6: Other ways to trace the total amoun
Page 7: Measuring the Conversion Factor wit
Page 11 and 12: Our Technique: Minimizing Scatter i
Page 13 and 14: Example of the Technique
Page 15 and 16: The Observations DGR = ΣD/(ΣHI +
Page 17 and 18: The Observations DGR = ΣD/(ΣHI +
Page 19 and 20: NGC0628 Results
Page 27 and 28: Variations we see in αCO • MW α
Page 29 and 30: NGC 0628 0.2 dex radial profiles fr
Page 41 and 42: What drives variations in αCO? NGC
Page 43 and 44: Dust-to-Gas Ratio Linear trend with
Page 45 and 46: Metallicity isn’t everything... I
Page 47 and 48: What drives variations in αCO? αC
Page 49 and 50: Azimuthal Variations in NGC 6946 Lo
Page 51 and 52: Disagreement with Virial Mass αCO
Page 53 and 54: Our conversion factors makes some g

Measurements of the CO-to-H 2 Conversion Factor and Dust-to-Gas ...

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