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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.

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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
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)
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
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:
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
Deposited By: Ruth Sustaita
Deposited On:19 Apr 2016 18:18
Last Modified:05 Nov 2019 05:49

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