The Physical Characteristics of Interstellar Medium in NGC 3665 with Herschel Observations

Abstract

We present the analysis of the physical properties of the interstellar medium (ISM) in the nearby early-type galaxy NGC 3665, based on the far-infrared (FIR) photometric and spectroscopic data as observed by the Herschel Space Observatory. The fit to the spectral energy distribution reveals a high dust content in the galaxy, with the dust-to-stellar mass ratio of $M_{\mathrm{dust}}$/$M_{\ast }$ $\sim$ 1.1 $\times$ 10${}^{-4}$ that is nearly three times larger than the mean value of local S0+S0a galaxies. For the ionized regions (H~\textsc{ii} regions), the electron density (n${}_e$) is around 49.5 $\pm$ 11.9 cm${}^{-3}$ based on the [N~\textsc{ii}]\,122\,\mum/[N~\textsc{ii}]\,205\,\mum\ ratio. For the photodissociation regions, the heating efficiency is in the range of 1.26 $\times$ 10${}^{-3}$ and 1.37 $\times$ 10${}^{-3}$ based on the ([C~\textsc{ii}$]+[$O~\textsc{i}]\,63\,\mum)/$L_{\mathrm{TIR}}$, which is slightly lower than other local galaxies; the hydrogen nucleus density and the strength of FUV radiation field are n $\sim$ 10${}^4$ cm${}^{-3}$ and G${}_0$ $\sim$ 10${}^{-0.25}$, respectively. The above results are consistent with the presence of weak AGN and a low level of star-forming activity in NGC 3665. Our results give strong support to the `morphological quenching' scenario, where a compact, massive bulge can stabilize amount of cool gas against star formation.

31 pages, 6 figures, accepted to ApJ

References in corpus (24)

• A simple model to interpret the ultraviolet, optical and infrared emission from galaxies
• Dust Masses, PAH Abundances, and Starlight Intensities in the SINGS Galaxy Sample
• The Atlas3D Project - XXX. Star formation histories and stellar population scaling relations of early-type galaxies
• An Ultraviolet-to-Radio Broadband Spectral Atlas of Nearby Galaxies
• Evidence for Mature Bulges and an Inside-out Quenching Phase 3 Billion Years After the Big Bang
• A Herschel/PACS Far Infrared Line Emission Survey of Local Luminous Infrared Galaxies
• Bulge mass is king: The dominant role of the bulge in determining the fraction of passive galaxies in the Sloan Digital Sky Survey
• The Behavior of the Aromatic Features in M101 HII Regions: Evidence for Dust Processing
• A Compendium of Far-Infrared Line and Continuum Emission for 227 Galaxies Observed by the Infrared Space Observatory
• Inefficient Star Formation In Extremely Metal Poor Galaxies
• The ATLAS3D Project - XXVIII. Dynamically-driven star formation suppression in early-type galaxies
• Detection of the 205 um [NII] Line from the Carina Nebula
• A Herschel Space Observatory Spectral Line Survey of Local Luminous Infrared Galaxies from 194 to 671 Microns
• Shocked Molecular Hydrogen in the 3C 326 Radio Galaxy System
• Star Formation Rates from [CII] 158 um and Mid Infrared Emission Lines for Starbursts and AGN
• WISDOM Project - I: Black Hole Mass Measurement Using Molecular Gas Kinematics in NGC 3665
• A Herschel Survey of the [N II] 205 micron Line in Local Luminous Infrared Galaxies --- The [N II] 205 micron Emission as a Star Formation Rate Indicator
• Spitzer Observations of Transient, Extended Dust in Two Elliptical Galaxies: New Evidence of Recent Feedback Energy Release in Galactic Cores
• Insights into gas heating and cooling in the disc of NGC 891 from Herschel far-infrared spectroscopy
• Galaxy Zoo: Evidence for rapid, recent quenching within a population of AGN host galaxies
• The Nuclear Activities of Nearby S0 Galaxies
• Herschel Spectroscopy of Early Type Galaxies
• The physical characteristics of the gas in the disk of Centaurus A using the Herschel Space Observatory
• Solar Energetic Particle Event Associated with the 2012 July 23 Extreme Solar Storm

Cited by in corpus (4)

• Cold gas in a complete sample of group-dominant early-type galaxies
• First [NII]122$\mu$m line detection in a QSO-SMG pair BRI 1202-0725 at $z=4.69$
• Observations of cold gas and star formation in dwarf S0 galaxies
• Properties of Interstellar Medium in the S0 Galaxy NGC 1222: Evidence for Shocked-enhanced Line Emission