Matches in SemOpenAlex for { <https://semopenalex.org/work/W4210361205> ?p ?o ?g. }
- W4210361205 endingPage "194" @default.
- W4210361205 startingPage "194" @default.
- W4210361205 abstract "Accurately determining gas-phase metal-abundances within galaxies is critical as metals strongly affect the physics of the interstellar medium (ISM). To date, the vast majority of widely-used gas-phase abundance-indicators rely on emission from bright optical-lines, whose emissivities are highly sensitive to the electron temperature. Alternatively, direct-abundance methods exist that measure the temperature of the emitting gas directly, though these methods usually require challenging observations of highly-excited auroral lines. Low-lying far-infrared (FIR) fine-structure lines are largely insensitive to electron temperature and thus provide an attractive alternative to optically-derived abundances. Here, we introduce the far-infrared abundances (FIRA) project, which employs these FIR transitions, together with both radio free-free emission and hydrogen recombination-lines, to derive direct, absolute gas-phase oxygen-abundances. Our first target is M101, a nearby spiral-galaxy with a relatively steep abundance gradient. Our results are consistent with the O$^{++}$ electron-temperatures and absolute oxygen-abundances derived using optical direct-abundance methods by the CHemical Abundance Of Spirals (CHAOS) program, with a small difference ($sim$ 1.5$sigma$) in the radial abundance-gradients derived by the FIR/free-free-normalized vs. CHAOS/direct-abundance techniques. This initial result demonstrates the validity of the FIRA methodology $-$ with the promise of determining absolute metal-abundances within dusty star-forming galaxies, both locally and at high redshift." @default.
- W4210361205 created "2022-02-08" @default.
- W4210361205 creator A5009747490 @default.
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- W4210361205 creator A5085232062 @default.
- W4210361205 date "2022-02-01" @default.
- W4210361205 modified "2023-09-27" @default.
- W4210361205 title "Direct Far-infrared Metal Abundances (FIRA). I. M101" @default.
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- W4210361205 doi "https://doi.org/10.3847/1538-4357/ac3b4f" @default.