The JCMT nearby galaxies legacy survey: SCUBA-2 observations of nearby galaxies. Issue 2 (7th March 2023)
- Record Type:
- Journal Article
- Title:
- The JCMT nearby galaxies legacy survey: SCUBA-2 observations of nearby galaxies. Issue 2 (7th March 2023)
- Main Title:
- The JCMT nearby galaxies legacy survey: SCUBA-2 observations of nearby galaxies
- Authors:
- Pattle, Kate
Gear, Walter
Wilson, Christine D - Abstract:
- ABSTRACT: We present 850 $\mu$ m 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 the 12 CO J = 3 → 2 line in the SCUBA-2 850 $\mu$ m bandwidth using NGLS HARP data, finding a typical 12 CO 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 ($\Sigma _{\small {\rm SFR}}$ ). Typically, comparing SCUBA-2-derived H2 surface densities ($\Sigma _{\rm H_2}$ ) to $\Sigma _{\small {\rm SFR}}$ 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 $\Sigma _{\rm H_2}$ and $\Sigma _{\small {\rm SFR}}$ 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,ABSTRACT: We present 850 $\mu$ m 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 the 12 CO J = 3 → 2 line in the SCUBA-2 850 $\mu$ m bandwidth using NGLS HARP data, finding a typical 12 CO 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 ($\Sigma _{\small {\rm SFR}}$ ). Typically, comparing SCUBA-2-derived H2 surface densities ($\Sigma _{\rm H_2}$ ) to $\Sigma _{\small {\rm SFR}}$ 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 $\Sigma _{\rm H_2}$ and $\Sigma _{\small {\rm SFR}}$ 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. … (more)
- Is Part Of:
- Monthly notices of the Royal Astronomical Society. Volume 522:Issue 2(2023)
- Journal:
- Monthly notices of the Royal Astronomical Society
- Issue:
- Volume 522:Issue 2(2023)
- Issue Display:
- Volume 522, Issue 2 (2023)
- Year:
- 2023
- Volume:
- 522
- Issue:
- 2
- Issue Sort Value:
- 2023-0522-0002-0000
- Page Start:
- 2339
- Page End:
- 2368
- Publication Date:
- 2023-03-07
- Subjects:
- galaxies: ISM -- galaxies: star formation -- submillimetre: galaxies
Astronomy -- Periodicals
Periodicals
520.5 - Journal URLs:
- http://mnras.oxfordjournals.org/ ↗
http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966 ↗
http://www.blackwell-synergy.com/issuelist.asp?journal=mnr ↗
http://www.blackwell-synergy.com/loi/mnr ↗
http://ukcatalogue.oup.com/ ↗ - DOI:
- 10.1093/mnras/stad652 ↗
- Languages:
- English
- ISSNs:
- 0035-8711
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 5943.000000
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 27047.xml