$Herschel$/PACS OH Spectroscopy of Seyfert, LINER, and Starburst Galaxies

Abstract

We investigated the 65$\mu$m, 71$\mu$m, 79$\mu$m, 84$\mu$m, 119$\mu$m, and 163$\mu$m OH doublets of 178 local (0 < $z$ < 0.35) galaxies. They were observed using the $Herschel$/PACS spectrometer, including Seyfert galaxies, LINERs, and star-forming galaxies. We observe these doublets exclusively in absorption (OH71), primarily in absorption (OH65, OH84), mostly in emission (OH79), only in emission (OH163) and an approximately even mix of the both (OH119). In 19 galaxies we find P-Cygni or reverse P-Cygni line profiles in the OH doublets. We use several galaxy observables to probe spectral classification, brightness of a central AGN/starburst component, and radiation field strength. We find that OH79, OH119, and OH163 are more likely to display strong emission for bright, unobscured AGN. For less luminous, obscured AGN and non-active galaxies, we find populations of strong absorption (OH119), weaker emission (OH163), and a mix of weak emission and weak absorption (OH79). For OH65, OH71 and OH84, we do not find significant correlations with the observables listed above. We do find relationships between OH79 and OH119 with both the 9.7$\mu$m silicate feature and Balmer decrement dust extinction tracers in which more dust leads to weaker emission / stronger absorption. The origin of emission for the observed OH doublets, whether from collisional excitation, or from radiative pumping by infrared photons, is discussed.

arXiv comment29 pages, 10 figures, 5 machine readable tables and 6 supplemental figures available upon request

References in corpus (55)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Array Programming with NumPy
• Astropy: A Community Python Package for Astronomy
• The NumPy array: a structure for efficient numerical computation
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• Energy input from quasars regulates the growth and activity of black holes and their host galaxies
• Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy
• The Spitzer Space Telescope Mission
• The Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory
• The Burst Alert Telescope (BAT) on the Swift MIDEX Mission
• An atomic and molecular database for analysis of submillimetre line observations
• The Infrared Spectrograph on the Spitzer Space Telescope
• Physical Models of Galaxy Formation in a Cosmological Framework
• A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies
• SINGS: The SIRTF Nearby Galaxies Survey
• Quasar feedback revealed by giant molecular outflows
• Massive molecular outflows and negative feedback in ULIRGs observed by Herschel-PACS
• Optical Spectroscopy and Nebular Oxygen Abundances of the Spitzer/SINGS Galaxies
• Spitzer Quasar and ULIRG Evolution Study (QUEST). IV. Comparison of 1-Jy Ultraluminous Infrared Galaxies with Palomar-Green Quasars
• Mid-IR Galaxy Classification Based on Silicate Obscuration and PAH Equivalent Width
• Fast Molecular Outflows in Luminous Galaxy Mergers: Evidence for Quasar Feedback from Herschel
• The unusual emission line spectrum of IZw1
• Herschel PACS Spectroscopic Diagnostics of Local ULIRGs: Conditions and Kinematics in Mrk 231
• Observations of Arp 220 using Herschel-SPIRE: An Unprecedented View of the Molecular Gas in an Extreme Star Formation Environment
• Cold Molecular Outflows in the Local Universe
• Detection of HCN, HCO+ and HNC in the Mrk231 molecular outflow - Dense molecular gas in the AGN wind
• Herschel/PACS spectroscopy of NGC 4418 and Arp 220: H2O, H2^{18}O, OH, ^{18}OH, O I, HCN and NH3
• Far-infrared Fine-Structure Line Diagnostics of Ultraluminous Infrared Galaxies
• Diagnostics of AGN-driven Molecular Outflows in ULIRGs from Herschel-PACS Observations of OH at 119um
• Molecular outflows in local ULIRGs: energetics from multi-transition OH analysis
• Multiwavelength Energy Distributions and Bolometric Luminosities of the 12--Micron Galaxy Sample
• SPICA - a large cryogenic infrared space telescope Unveiling the obscured Universe
• Spitzer-IRS high resolution spectroscopic survey of the 12 micron Seyfert galaxies: II. Results for the Complete Dataset
• Spitzer/IRS 5-35 um Low-Resolution Spectroscopy of the 12 um Seyfert Sample
• Isotropic Luminosity Indicators in a Complete AGN Sample
• The far-infrared spectrum of Arp 220
• Dust and Atomic Gas in Dwarf Irregular Galaxies of the M81 Group: The SINGS and THINGS view
• The X-ray to [Ne V]3426 flux ratio: discovering heavily obscured AGN in the distant Universe
• Far-infrared line spectra of active galaxies from the Herschel/PACS Spectrometer: the complete database
• A mid-infrared spectroscopic atlas of local active galactic nuclei on sub-arcsecond resolution using GTC/CanariCam
• Spitzer-IRS high resolution spectroscopy of the 12μm Seyfert galaxies: I. First results
• The Mrk 231 molecular outflow as seen in OH
• The far-infrared emission line and continuum spectrum of the Seyfert galaxy NGC 1068
• Resolving the AGN and host emission in the mid-infrared using a model-independent spectral decomposition
• On the LINER nuclear obscuration, Compton-thickness and the existence of the dusty torus; Clues from Spitzer/IRS spectra
• A complete census of silicate features in the mid-infrared spectra of active galaxies
• High-excitation OH and H_2O lines in Markarian 231: the molecular signatures of compact far-infrared continuum sources
• Search for Molecular Outflows in Local Volume AGN with Herschel-PACS
• Far-infrared line spectra of Seyfert galaxies from the Herschel-PACS Spectrometer
• Galaxy evolution studies with the SPace IR telescope for Cosmology and Astrophysics (SPICA): the power of IR spectroscopy
• Herschel spectroscopic observations of the compact obscured nucleus in Zw 049.057
• Emission Line Properties of Seyfert Galaxies in the 12 Micron Sample
• Feedback and feeding in the context of galaxy evolution with SPICA: direct characterization of molecular outflows and inflows
• Optical spectral classification of southern ultraluminous infrared galaxies
• Metallicity in the merger Seyfert galaxy NGC 6240

Cited by in corpus (6)

• Physics of ULIRGs with MUSE and ALMA: PUMA IV. No tight relation between cold molecular outflow rates and AGN luminosities
• A comprehensive view of the interstellar medium in a quasar host galaxy at z~6.4
• Self-consistent dust and non-LTE line radiative transfer with SKIRT
• Molecular gas stratification and disturbed kinematics in the Seyfert galaxy MCG-05-23-16 revealed by JWST and ALMA
• Molecular Outflows in z > 6 QSO Hosts Driven by Star Formation
• Mid-IR cosmological spectrophotometric surveys from space: Measuring AGN and star formation at the Cosmic Noon with a SPICA-like mission