The DOI matches its Crossref record; 3 of the 3 references it cites were found in a registry or an index.
THE CO-TO-H2CONVERSION FACTOR FROM INFRARED DUST EMISSION ACROSS THE LOCAL GROUP
Open accessAbstract
We estimate the conversion factor relating CO emission to H 2 mass, α CO , in five Local Group galaxies that span approximately an order of magnitude in metallicity—M 31, M 33, the Large Magellanic Cloud (LMC), NGC 6822, and the Small Magellanic Cloud (SMC). We model the dust mass along the line of sight from infrared (IR) emission and then solve for the α CO that best allows a single gas-to-dust ratio (δ GDR ) to describe each system. This approach remains sensitive to CO-dark envelopes H 2 surrounding molecular clouds. In M 31, M 33, and the LMC we find α CO ≈ 3–9 M ☉ pc −2 (K km s −1 ) −1 , consistent with the Milky Way value within the uncertainties. The two lowest metallicity galaxies in our sample, NGC 6822 and the SMC (12 + log (O/H) ≈ 8.2 and 8.0), exhibit a much higher α CO . Our best estimates are α NGC6822 CO ≈ 30 M ☉ pc −2 (K km s −1 ) −1 and α SMC CO ≈ 70 M ☉ pc −2 (K km s −1 ) −1 . These results are consistent with the conversion factor becoming a strong function of metallicity around 12 + log (O/H) ∼ 8.4–8.2. We favor an interpretation where decreased dust shielding leads to the dominance of CO-free envelopes around molecular clouds below this metallicity.
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Schlegel, D. J., Finkbeiner, D. P., & Davis, M. (1998) · The Astrophysical Journal · doi:10.1086/305772 · Cited by 15,126
Draine, B. T., & Li, A. (2007) · The Astrophysical Journal · doi:10.1086/511055 · Cited by 2,122
Sp i t zer MIPS Infrared Imaging of M31: Further Evidence for a Spiral-Ring Composite Structure
Gordon, K. D., Bailin, J., Engelbracht, C. W., Rieke, G. H., Misselt, K. A., Latter, W. B., Young, E. T., Ashby, M. L. N., Barmby, P., Gibson, B. K., et al. (2006) · The Astrophysical Journal · doi:10.1086/501046 · Cited by 182
Self-citation
Cited by
Star Formation in the Milky Way and Nearby Galaxies
Kennicutt, R. C., & Evans, N. J. (2012) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev-astro-081811-125610 · Cited by 2,902
“(6) Leroy et al. (2011) minimize the variation in δgdr to find the best fit to α′CO in several nearby galaxies.”
BackgroundInfluentialDusty star-forming galaxies at high redshift
Casey, C. M., Narayanan, D., & Cooray, A. (2014) · Physics Reports · doi:10.1016/j.physrep.2014.02.009 · Cited by 800
Draine, B. T., Aniano, G., Krause, O., Groves, B., Sandstrom, K., Braun, R., Leroy, A., Klaas, U., Linz, H., Rix, H.-W., et al. (2013) · The Astrophysical Journal · doi:10.1088/0004-637x/780/2/172 · Cited by 462
Self-citationNarayanan, D., Krumholz, M. R., Ostriker, E. C., & Hernquist, L. (2012) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2012.20536.x · Cited by 383
Béthermin, M., Daddi, E., Magdis, G., Lagos, C., Sargent, M., Albrecht, M., Aussel, H., Bertoldi, F., Buat, V., Galametz, M., et al. (2015) · Astronomy & Astrophysics · doi:10.1051/0004-6361/201425031 · Cited by 305
Metadata
- Authors
- Leroy, A. K., Bolatto, A., Gordon, K., Sandstrom, K., Gratier, P., Rosolowsky, E., Engelbracht, C. W., Mizuno, N., Corbelli, E., Fukui, Y., & Kawamura, A.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2011-07-22
- Volume
- 737
- Issue
- 1
- Pages
- 12
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2077276236
- Cited by
- 588
- References
- 3
- FWCI
- 25.93
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Leroy, A. K., Bolatto, A., Gordon, K., Sandstrom, K., Gratier, P., Rosolowsky, E., Engelbracht, C. W., Mizuno, N., Corbelli, E., Fukui, Y., & Kawamura, A. (2011). THE CO-TO-H2CONVERSION FACTOR FROM INFRARED DUST EMISSION ACROSS THE LOCAL GROUP. The Astrophysical Journal. https://doi.org/10.1088/0004-637x/737/1/12
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