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The [N II] 205μm Emission in Local Luminous Infrared Galaxies

Zhao, Yinghe and Lu, Nanyao and Xu, C. Kevin and Gao, Yu and Lord, Steven D. and Charmandaris, Vassilis and Díaz-Santos, Tanio and Evans, Aaron and Howell, Justin and Petric, Andreea O. and van der Werf, Paul P. and Sanders, David B. (2016) The [N II] 205μm Emission in Local Luminous Infrared Galaxies. Astrophysical Journal, 819 (1). Art. No. 69. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20160419-070257774

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Abstract

In this paper, we present the measurements of the [N II] 205 μm line for a flux-limited sample of 122 (ultra-)luminous infrared galaxies [(U)LIRGs] and 20 additional normal galaxies, obtained with the Herschel Space Observatory (Herschel). We explore the far-infrared (FIR) color dependence of the [N II] 205 μm (L_([N II]205μm)) to the total infrared (L_(IR)) luminosity ratio, and find that L_([N II]205μm)/L_(IR) only depends modestly on the 70–160 μm flux density ratio (f_(70)/f_(160)) when f_(70)/f_(160) ≾ 0.6, whereas such dependence becomes much steeper for f_(70/f_(160) > 0.6. We also investigate the relation between L_([N II]205μm) and star formation rate (SFR), and show that L_([N II]205μm) has a nearly linear correlation with SFR, albeit the intercept of such a relation varies somewhat with f_(60)/f_(100), consistent with our previous conclusion that [N II] 205 μm emission can serve as an SFR indicator with an accuracy of ~0.4 dex, or ~0.2 dex if f_(60)/f_(100) is known independently. Furthermore, together with the Infrared Space Observatory measurements of [N II], we use a total of ~200 galaxies to derive the local [N II] 205 μm luminosity function (LF) by tying it to the known IR LF with a bivariate method. As a practical application, we also compute the local SFR volume density (ṗ_(SFR)) using the newly derived SFR calibrator and LF. The resulting log ṗ_(SFR) = -1.96 ± 0.11 M_☉ yr^(−1) Mpc^(−3) agrees well with previous studies. Finally, we determine the electron densities (n_e) of the ionized medium for a subsample of 12 (U)LIRGs with both [N II] 205 μm and [N II] 122 μm data, and find that n_e is in the range of ~1–100 cm^(−3), with a median value of 22 cm^(−3).


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.3847/0004-637X/819/1/69DOIArticle
http://iopscience.iop.org/article/10.3847/0004-637X/819/1/69/metaPublisherArticle
ORCID:
AuthorORCID
Zhao, Yinghe0000-0002-9128-818X
Lu, Nanyao0000-0002-8948-1044
Xu, C. Kevin0000-0002-1588-6700
Gao, Yu0000-0003-0007-2197
Charmandaris, Vassilis0000-0002-2688-1956
Díaz-Santos, Tanio0000-0003-0699-6083
Evans, Aaron0000-0003-2638-1334
Petric, Andreea O.0000-0003-4030-3455
van der Werf, Paul P.0000-0001-5434-5942
Sanders, David B.0000-0002-1233-9998
Additional Information:© 2016 The American Astronomical Society. Received 2015 April 6; accepted 2016 January 6; published 2016 February 29. We thank the anonymous referee for a careful reading and constructive comments. We thank Dr Álvaro Orsi for providing his simulation results of the [N ii] 205 μm LFs. Support for this work was provided in part by NASA through an award issued by JPL/Caltech. Y.Z. and Y.G. are partially supported by the National Natural Science Foundation of China under grant Nos. 11173059, 11390373, and 11420101002, and the CAS pilot-b project #XDB09000000. V.C. would like to acknowledge partial support from the EU FP7 Grant PIRSES-GA-2012-316788. T.D.-S. acknowledges support from ALMA-CONICYT project 31130005 and FONDECYT project 1151239. This research has made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
National Natural Science Foundation of China11173059
National Natural Science Foundation of China11390373
National Natural Science Foundation of China11420101002
Chinese Academy of SciencesXDB09000000
Marie Curie FellowshipPIRSES-GA-2012-316788
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)31130005
Fondo Nacional de Desarrollo Científico, Tecnológico y de Innovación Tecnológica (FONDECYT)1151239
NASA/JPL/CaltechUNSPECIFIED
Subject Keywords:galaxies: evolution; galaxies: ISM; galaxies: luminosity function, mass function; galaxies: starburst; infrared: ISM
Issue or Number:1
Record Number:CaltechAUTHORS:20160419-070257774
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160419-070257774
Official Citation:Yinghe Zhao (赵应和) et al 2016 ApJ 819 69
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66266
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:19 Apr 2016 18:18
Last Modified:05 Nov 2019 05:49

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