التفاصيل البيبلوغرافية
| العنوان: |
Direct Far-Infrared Metal Abundances (FIRA) I: M101 |
| المؤلفون: |
C. Lamarche, J. D. Smith, K. Kreckel, S. T. Linden, N. S. J. Rogers, E. Skillman, D. Berg, E. Murphy, R. Pogge, G. P. Donnelly, R. Kennicutt, A. Bolatto, K. Croxall, B. Groves, C. Ferkinhoff |
| بيانات النشر: |
arXiv, 2021. |
| سنة النشر: |
2021 |
| مصطلحات موضوعية: |
Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Astrophysics::Solar and Stellar Astrophysics, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics - Astrophysics of Galaxies, Astrophysics::Galaxy Astrophysics |
| الوصف: |
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.
Comment: 28 pages, 11 figures, 5 tables, accepted for publication in the Astrophysical Journal |
| DOI: |
10.48550/arxiv.2111.10385 |
| URL الوصول: |
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::01b23797b2972c82a69c0ed9e7d79a1b |
| Rights: |
OPEN |
| رقم الانضمام: |
edsair.doi.dedup.....01b23797b2972c82a69c0ed9e7d79a1b |
| قاعدة البيانات: |
OpenAIRE |