Academic Journal
The JCMT nearby galaxies legacy survey: SCUBA-2 observations of nearby galaxies
| العنوان: | The JCMT nearby galaxies legacy survey: SCUBA-2 observations of nearby galaxies |
|---|---|
| المؤلفون: | Pattle, K, Gear, W, Wilson, CD |
| المصدر: | Monthly Notices of the Royal Astronomical Society , 522 (2) pp. 2339-2368. (2023) |
| سنة النشر: | 2023 |
| المجموعة: | University College London: UCL Discovery |
| مصطلحات موضوعية: | galaxies: ISM – galaxies: star formation – submillimetre: galaxies. |
| الوصف: | We present 850 μm observations of a sample of 8 nearby spiral galaxies, made using the SCUBA-2 camera on the James Clerk Maxwell Telescope (JCMT) as part of the JCMT Nearby Galaxies Legacy Survey (NGLS). We corrected our data for the presence of the12CO J = 3 → 2 line in the SCUBA-2 850 μm bandwidth using NGLS HARP data, finding a typical12CO contribution of ∼20 per cent. We measured dust column densities, temperatures, and opacity indices by fitting spectral energy distributions constructed from SCUBA-2 and archival Herschel observations, and used archival GALEX and Spitzer data to make maps of surface density of star formation (∑SFR). Typically, comparing SCUBA-2-derived H2 surface densities (∑H2) to ∑SFR gives shallow star formation law indices within galaxies, with SCUBA-2-derived values typically being sublinear and Herschel-derived values typically being broadly linear. This difference is likely due to the effects of atmospheric filtering on the SCUBA-2 data. Comparing the mean values of ∑H2 and ∑SFR of the galaxies in our sample returns a steeper star formation law index, broadly consistent with both the Kennicutt–Schmidt value of 1.4 and linearity. Our results show that a SCUBA-2 detection is a good predictor of star formation. We suggest that Herschel emission traces gas in regions which will form stars on time-scales ∼5 − 100 Myr, comparable to the star formation time-scale traced by GALEX and Spitzer data, while SCUBA-2 preferentially traces the densest gas within these regions, which likely forms stars on shorter time-scales. |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | text |
| اللغة: | English |
| Relation: | https://discovery.ucl.ac.uk/id/eprint/10172459/1/Pattle_The%20JCMT%20nearby%20galaxies%20legacy%20survey_VoR.pdf; https://discovery.ucl.ac.uk/id/eprint/10172459/ |
| الاتاحة: | https://discovery.ucl.ac.uk/id/eprint/10172459/1/Pattle_The%20JCMT%20nearby%20galaxies%20legacy%20survey_VoR.pdf https://discovery.ucl.ac.uk/id/eprint/10172459/ |
| Rights: | open |
| رقم الانضمام: | edsbas.8E0A94A8 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |