English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We investigate the relationship between the dust-to-metals ratio (D/M) andthe local interstellar medium environment at ~2 kpc resolution in five nearbygalaxies: IC342, M31, M33, M101, and NGC628. A modified blackbody model with abroken power-law emissivity is used to model the dust emission from 100 to 500um observed by Herschel. We utilize the metallicity gradient derived fromauroral line measurements in HII regions whenever possible. Both archival andnew CO rotational line and HI 21 cm maps are adopted to calculate gas surfacedensity, including new wide field CO and HI maps for IC342 from IRAM and theVLA, respectively. We experiment with several prescriptions of CO-to-H$_2$conversion factor, and compare the resulting D/M-metallicity and D/M-densitycorrelations, both of which are expected to be non-negative from depletionstudies. The D/M is sensitive to the choice of the conversion factor. Theconversion factor prescriptions based on metallicity only yield too muchmolecular gas in the center of IC342 to obtain the expected correlations. Amongthe prescriptions tested, the one that yields the expected correlations dependson both metallicity and surface density. The 1-$\sigma$ range of the derivedD/M spans 0.40-0.58. Compared to chemical evolution models, our measurementssuggest that the dust growth time scale is much shorter than the dustdestruction time scale. The measured D/M is consistent with D/M ingalaxy-integrated studies derived from infrared dust emission. Meanwhile, themeasured D/M is systematically higher than the D/M derived from absorption,which likely indicates a systematic offset between the two methods.

Resolving the Dust-to-Metals Ratio and CO-to-H$_2$ Conversion Factor in the Nearby Universe