NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-24 T03:41:35 PDT
Help | Comment | NED Home

For refcode 2016ApJ...819...69Z:
Retrieve 196 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2016ApJ...819...69Z The [NII] 205 micron Emission in Local Luminous Infrared Galaxies Zhao, Yinghe; Lu, Nanyao; Xu, C. Kevin; Gao, Yu; Lord, Steven D.; Charmandaris, Vassilis; Diaz-Santos, Tanio; Evans, Aaron; Howell, Justin; Petric, Andreea O.; van der Werf, Paul P.; Sanders, David B. Abstract. In this paper, we present the measurements of the [N II] 205 micron 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 micron (L_[N II]205 micron_) to the total infrared (L_IR_) luminosity ratio, and find that L_[N II]205 micron_/L_IR_ only depends modestly on the 70-160 micron 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_\gt 0.6. We also investigate the relation between L_[N II]205 micron_ and star formation rate (SFR), and show that L_[N II]205 micron_ 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 micron 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 micron 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 ({\dot{rho}}_{{SFR_}}) using the newly derived SFR calibrator and LF. The resulting {log} {\dot{rho}}_{{SFR_}}=-1.96+/- 0.11 M_sun_ 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 micron and [N II] 122 micron data, and find that n_e_ is in the range of ~1-100 cm^-3^, with a median value of 22 cm^-3^. Based on Herschel observations. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. Key words: galaxies: evolution, galaxies: ISM, galaxies: luminosity function, mass function, galaxies: starburst, infrared: ISM
Retrieve 196 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home