CO-Dark Star Formation and Black Hole Activity in 3C 368 at z = 1.131: Coeval Growth of Stellar and Supermassive Black Hole Masses

Abstract

We present the detection of four far-infrared fine-structure oxygen lines, as well as strong upper limits for the CO(2-1) and [N II] 205 um lines, in 3C 368, a well-studied radio-loud galaxy at z = 1.131. These new oxygen lines, taken in conjunction with previously observed neon and carbon fine-structure lines, suggest a powerful active galactic nucleus (AGN), accompanied by vigorous and extended star formation. A starburst dominated by O8 stars, with an age of ~6.5 Myr, provides a good fit to the fine-structure line data. This estimated age of the starburst makes it nearly concurrent with the latest episode of AGN activity, suggesting a link between the growth of the supermassive black hole and stellar population in this source. We do not detect the CO(2-1) line, down to a level twelve times lower than the expected value for star forming galaxies. This lack of CO line emission is consistent with recent star formation activity if the star-forming molecular gas has low metallicity, is highly fractionated (such that CO is photodissociated through much of the clouds), or is chemically very young (such that CO has not yet had time to form). It is also possible, though we argue unlikely, that the ensemble of fine structure lines are emitted from the region heated by the AGN.

arXiv comment10 pages, 4 figures, 2 tables, accepted for publication in the Astrophysical Journal

References in corpus (39)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• The chemical composition of the Sun
• A Fundamental Relation Between Supermassive Black Holes and Their Host Galaxies
• Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy
• The Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory
• The CO-to-H2 Conversion Factor
• The Infrared Spectrograph on the Spitzer Space Telescope
• Cool Gas in High Redshift Galaxies
• Molecular Gas at High Redshift
• Powerful Outflows and Feedback from Active Galactic Nuclei
• Far Infrared and Submillimeter Emission from Galactic and Extragalactic Photo-Dissociation Regions
• Combined CO & Dust Scaling Relations of Depletion Time and Molecular Gas Fractions with Cosmic Time, Specific Star Formation Rate and Stellar Mass
• ISM masses and the star formation law at Z = 1 to 6 // ALMA observations of dust continuum in 145 galaxies in the COSMOS survey field
• Stellar evolution with rotation X: Wolf-Rayet star populations at solar metallicity
• Diagnostics of irradiated dense gas in galaxy nuclei. II. A grid of XDR and PDR models
• A 158 Micron [CII] Line Survey of Galaxies at z ~ 1 to 2: An Indicator of Star Formation in the Early Universe
• CASSIS: The Cornell Atlas of Spitzer/IRS Sources
• Unleashing Positive Feedback: Linking the Rates of Star Formation, Supermassive Black Hole Accretion and Outflows in Distant Galaxies
• Jet-induced star formation in gas-rich galaxies
• The dusty heart of nearby active galaxies -- II. From clumpy torus models to physical properties of dust around AGN
• A submillimetre survey of the star-formation history of radio galaxies
• Triggered Star Formation in a Massive Galaxy at z=3.8: 4C41.17
• HST, radio and infrared observations of 28 3CR radio galaxies at redshift z ~ 1: I. Old stellar populations in central cluster galaxies
• Minkowski's Object: A Starburst Triggered by a Radio Jet, Revisited
• Detection of the 205 um [NII] Line from the Carina Nebula
• Herschel/HIFI observations of [CII] and [13CII] in PDRs
• Detection of the 158 micron [CII] Transition at z=1.3: Evidence for a Galaxy-Wide Starburst
• CASSIS: The Cornell Atlas of Spitzer/Infrared Spectrograph Sources. II. High-resolution observations
• Approximations for modelling CO chemistry in GMCs: a comparison of approaches
• The nature of the interstellar medium of the starburst low-metallicity galaxy Haro11: a multi-phase model of the infrared emission
• CO(1-0) survey of high-z radio galaxies: alignment of molecular halo gas with distant radio sources
• First Detection of the [OIII] 88 micron Line at High Redshifts: Characterizing the Starburst and Narrow Line Regions in Extreme Luminosity Systems
• Star formation in z>1 3CR host galaxies as seen by Herschel
• Improved collision strengths and line ratios for forbidden [O III] far-infrared and optical lines
• Deep spectroscopy of distant 3CR radio galaxies: the data
• Deep radio observations of 3C324 and 3C368: evidence for jet-cloud interactions
• The Infrared Database of Extragalactic Observables from Spitzer I: the redshift catalog
• The Energetics of Molecular Gas in NGC 891 from H2 and FIR Spectroscopy
• Spitzer observations of extragalactic H II regions - III. NGC 6822 and the hot star, H II region connection

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