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THE IONIZED GAS IN NEARBY GALAXIES AS TRACED BY THE[N II] 122 AND 205 mu m TRANSITIONS

Herrera-Camus, R.; Bolatto, Alberto; Smith, J. D.; Draine, Bruce T; Pellegrini, E.; Wolfire, M.; Croxall, K V; de Looze, I.; Calzetti, Daniela; Kennicutt, Robert C; Brandl, Bernhard R; Armus, Lee; Groves, Brent Allan; Walter, Fabian; Beirao, P.

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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 kpc, 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 of n e ~ 1–300 cm−3, with a median value of n e = 30 cm−3....[Show more]

dc.contributor.authorHerrera-Camus, R.
dc.contributor.authorBolatto, Alberto
dc.contributor.authorSmith, J. D.
dc.contributor.authorDraine, Bruce T
dc.contributor.authorPellegrini, E.
dc.contributor.authorWolfire, M.
dc.contributor.authorCroxall, K V
dc.contributor.authorde Looze, I.
dc.contributor.authorCalzetti, Daniela
dc.contributor.authorKennicutt, Robert C
dc.contributor.authorBrandl, Bernhard R
dc.contributor.authorArmus, Lee
dc.contributor.authorGroves, Brent Allan
dc.contributor.authorWalter, Fabian
dc.contributor.authorBeirao, P.
dc.date.accessioned2018-11-29T22:52:23Z
dc.date.available2018-11-29T22:52:23Z
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1885/152155
dc.description.abstractThe [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 kpc, 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 of 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 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 (SFR) surface density (ΣSFR). As the intensity of the [N ii] transitions is related to the ionizing photon flux, we investigate their reliability as tracers of the 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 ΣSFR 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 because 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.
dc.format.mimetypeapplication/pdf
dc.publisherIOP Publishing
dc.sourceThe Astrophysical Journal
dc.titleTHE IONIZED GAS IN NEARBY GALAXIES AS TRACED BY THE[N II] 122 AND 205 mu m TRANSITIONS
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume826
dc.date.issued2016
local.identifier.absfor020100 - ASTRONOMICAL AND SPACE SCIENCES
local.identifier.ariespublicationa383154xPUB4232
local.type.statusPublished Version
local.contributor.affiliationHerrera-Camus, R., University of Maryland
local.contributor.affiliationBolatto, Alberto, University of Maryland
local.contributor.affiliationSmith, J. D., University of Toledo
local.contributor.affiliationDraine, Bruce T, Princeton University
local.contributor.affiliationPellegrini, E., Zentrum für Astronomie der Universität Heidelberg
local.contributor.affiliationWolfire, M., University of Maryland
local.contributor.affiliationCroxall, K V, Ohio State University
local.contributor.affiliationde Looze, I., University of Cambridge
local.contributor.affiliationCalzetti, Daniela, University of Massachusetts
local.contributor.affiliationKennicutt, Robert C , University of Cambridge
local.contributor.affiliationBrandl, Bernhard R, Leiden University
local.contributor.affiliationArmus, Lee, Spitzer Science Center, Caltech
local.contributor.affiliationGroves, Brent Allan, College of Science, ANU
local.contributor.affiliationWalter, Fabian, Max Planck Institute for Astronomy
local.contributor.affiliationBeirao, P., Observatoire de Paris
local.bibliographicCitation.issue2
local.identifier.doi10.3847/0004-637X/826/2/175
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2018-11-29T07:45:42Z
local.identifier.scopusID2-s2.0-84982311406
local.identifier.thomsonID000381977900075
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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