The ionized gas in nearby galaxies as traced by the [N II] 122 and 205 μm transitions
The [N II] 122 and 205 μm transitions are powerful tracers of the ionized gas in the interstellar medium. By combining data from 21 galaxies selected from the Herschel KINGFISH and Beyond the Peak surveys, we have compiled 141 spatially resolved regions with a typical size of ~1 kiloparsec, with obs...
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| Lingua: | inglese |
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Institute of Physics
2019
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| Accesso online: | https://demo7.dspace.org/handle/123456789/475 |
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| author | Herrera-Camus, R Bolatto, A Smith, JD Draine, B Pellegrini, E Wolfire, M Croxall, K de, Looze I Calzetti, D Kennicutt, Robert Crocker, A Armus, L van, der Werf P Sandstrom, K Galametz, M Brandl, B Groves, B Rigopoulou, D Walter, F Leroy, A Boquien, M Tabatabaei, FS Beirao, P |
| author2 | Ecosystem Management (ECOBE) |
| author_browse | Armus, L Beirao, P Bolatto, A Boquien, M Brandl, B Calzetti, D Crocker, A Croxall, K Draine, B Ecosystem Management (ECOBE) Galametz, M Groves, B Herrera-Camus, R Kennicutt, Robert Leroy, A Pellegrini, E Rigopoulou, D Sandstrom, K Smith, JD Tabatabaei, FS Walter, F Wolfire, M de, Looze I van, der Werf P |
| author_facet | Ecosystem Management (ECOBE) Herrera-Camus, R Bolatto, A Smith, JD Draine, B Pellegrini, E Wolfire, M Croxall, K de, Looze I Calzetti, D Kennicutt, Robert Crocker, A Armus, L van, der Werf P Sandstrom, K Galametz, M Brandl, B Groves, B Rigopoulou, D Walter, F Leroy, A Boquien, M Tabatabaei, FS Beirao, P |
| author_sort | Herrera-Camus, R |
| collection | DSpace |
| description | The [N II] 122 and 205 μm transitions are powerful tracers of the ionized gas in the interstellar medium. By combining data from 21 galaxies selected from the Herschel KINGFISH and Beyond the Peak surveys, we have compiled 141 spatially resolved regions with a typical size of ~1 kiloparsec, with observations of both [N II] far-infrared lines. We measure [N II] 122/205 line ratios in the ~ 0.6 - 6 range, which corresponds to electron gas densities n$_e$ ~ 1 - 300 cm$^{-3}$ , with a median value of n$_e$ = 30 cm$^{-3}$ . Variations in the electron density within individual galaxies can be as a high as a factor of ~ 50, frequently with strong radial gradients. We find that n$_e$ increases as a function of infrared color, dust-weighted mean starlight intensity, and star formation rate surface density (Σ$_{SFR}$). As the intensity of the [N II] transitions is related to the ionizing photon flux, we investigate their reliability as tracers of the star formation rate (SFR). We derive relations between the [N II] emission and SFR in the low-density limit and in the case of a log-normal distribution of densities. The scatter in the correlation between [N II] surface brightness and Σ$_{SFR}$ can be understood as a property of the n$_e$ distribution. For regions with n$_e$ close to or higher than the [N II] line critical densities, the low-density limit [N II]-based SFR calibration systematically underestimates the SFR since the [N II] emission is collisionally quenched. Finally, we investigate the relation between [N II] emission, SFR, and n$_e$ by comparing our observations to predictions from the MAPPINGS-III code. |
| id | oai:localhost:123456789-475 |
| institution | DSPACE.FCHPT |
| language | English |
| publishDate | 2019 |
| publishDateRange | 2019 |
| publishDateSort | 2019 |
| publisher | Institute of Physics |
| publisherStr | Institute of Physics |
| record_format | dspace |
| spelling | oai:localhost:123456789-4752021-04-07T16:30:12Z The ionized gas in nearby galaxies as traced by the [N II] 122 and 205 μm transitions Herrera-Camus, R Bolatto, A Smith, JD Draine, B Pellegrini, E Wolfire, M Croxall, K de, Looze I Calzetti, D Kennicutt, Robert Crocker, A Armus, L van, der Werf P Sandstrom, K Galametz, M Brandl, B Groves, B Rigopoulou, D Walter, F Leroy, A Boquien, M Tabatabaei, FS Beirao, P Ecosystem Management (ECOBE) The [N II] 122 and 205 μm transitions are powerful tracers of the ionized gas in the interstellar medium. By combining data from 21 galaxies selected from the Herschel KINGFISH and Beyond the Peak surveys, we have compiled 141 spatially resolved regions with a typical size of ~1 kiloparsec, with observations of both [N II] far-infrared lines. We measure [N II] 122/205 line ratios in the ~ 0.6 - 6 range, which corresponds to electron gas densities n$_e$ ~ 1 - 300 cm$^{-3}$ , with a median value of n$_e$ = 30 cm$^{-3}$ . Variations in the electron density within individual galaxies can be as a high as a factor of ~ 50, frequently with strong radial gradients. We find that n$_e$ increases as a function of infrared color, dust-weighted mean starlight intensity, and star formation rate surface density (Σ$_{SFR}$). As the intensity of the [N II] transitions is related to the ionizing photon flux, we investigate their reliability as tracers of the star formation rate (SFR). We derive relations between the [N II] emission and SFR in the low-density limit and in the case of a log-normal distribution of densities. The scatter in the correlation between [N II] surface brightness and Σ$_{SFR}$ can be understood as a property of the n$_e$ distribution. For regions with n$_e$ close to or higher than the [N II] line critical densities, the low-density limit [N II]-based SFR calibration systematically underestimates the SFR since the [N II] emission is collisionally quenched. Finally, we investigate the relation between [N II] emission, SFR, and n$_e$ by comparing our observations to predictions from the MAPPINGS-III code. 2019-04-26T08:57:28Z 2019-04-26T08:57:28Z 2016 https://demo7.dspace.org/handle/123456789/475 en Institute of Physics |
| spellingShingle | Herrera-Camus, R Bolatto, A Smith, JD Draine, B Pellegrini, E Wolfire, M Croxall, K de, Looze I Calzetti, D Kennicutt, Robert Crocker, A Armus, L van, der Werf P Sandstrom, K Galametz, M Brandl, B Groves, B Rigopoulou, D Walter, F Leroy, A Boquien, M Tabatabaei, FS Beirao, P The ionized gas in nearby galaxies as traced by the [N II] 122 and 205 μm transitions |
| title | The ionized gas in nearby galaxies as traced by the [N II] 122 and 205 μm transitions |
| title_full | The ionized gas in nearby galaxies as traced by the [N II] 122 and 205 μm transitions |
| title_fullStr | The ionized gas in nearby galaxies as traced by the [N II] 122 and 205 μm transitions |
| title_full_unstemmed | The ionized gas in nearby galaxies as traced by the [N II] 122 and 205 μm transitions |
| title_short | The ionized gas in nearby galaxies as traced by the [N II] 122 and 205 μm transitions |
| title_sort | ionized gas in nearby galaxies as traced by the n ii 122 and 205 μm transitions |
| url | https://demo7.dspace.org/handle/123456789/475 |
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