Search Publications
The Interstellar Medium in Distant Star-forming Galaxies: Turbulent Pressure, Fragmentation, and Cloud Scaling Relations in a Dense Gas Disk at z = 2.3
Thomson, A. P.; Ivison, R. J.; Smail, Ian +7 more
We have used the Institut de Radioastronomie Millimétrique (IRAM) Plateau de Bure Interferometer and the Expanded Very Large Array to obtain a high-resolution map of the CO(6-5) and CO(1-0) emission in the lensed, star-forming galaxy SMM J2135-0102 at z = 2.32. The kinematics of the gas are well described by a model of a rotationally supported dis…
The Tucana/Horologium, Columba, AB Doradus, and Argus Associations: New Members and Dusty Debris Disks
Zuckerman, B.; Song, Inseok; Bessell, M. S. +1 more
We propose 35 star systems within ~70 pc of Earth as newly identified members of nearby young stellar kinematic groups; these identifications include the first A- and late-B-type members of the AB Doradus moving group and field Argus Association. All but one of the 35 systems contain a bright solar- or earlier-type star that should make an excelle…
Line Derived Infrared Extinction toward the Galactic Center
Lutz, D.; Genzel, R.; Gillessen, S. +7 more
We derive the extinction curve toward the Galactic center (GC) from 1 to 19 µm. We use hydrogen emission lines of the minispiral observed by ISO-SWS and SINFONI. The extinction-free flux reference is the 2 cm continuum emission observed by the Very Large Array. Toward the inner 14'' × 20'', we find an extinction of A 2.166 µm
The Majority of Compact Massive Galaxies at z ~ 2 are Disk Dominated
Bell, Eric F.; Koekemoer, Anton M.; van der Wel, Arjen +6 more
We investigate the stellar structure of massive, quiescent galaxies at z ~ 2, based on Hubble Space Telescope/WFC3 imaging from the Early Release Science program. Our sample of 14 galaxies has stellar masses of M * > 1010.8 M sun and photometric redshifts of 1.5 < z < 2.5. In agreement with previous work, …
Evidence for Ultra-fast Outflows in Radio-quiet Active Galactic Nuclei. II. Detailed Photoionization Modeling of Fe K-shell Absorption Lines
Cappi, M.; Dadina, M.; Tombesi, F. +3 more
X-ray absorption line spectroscopy has recently shown evidence for previously unknown Ultra-fast Outflows (UFOs) in radio-quiet active galactic nuclei (AGNs). These have been detected essentially through blueshifted Fe XXV/XXVI K-shell transitions. In the previous paper of this series we defined UFOs as those highly ionized absorbers with an outfl…
Torus and Active Galactic Nucleus Properties of Nearby Seyfert Galaxies: Results from Fitting Infrared Spectral Energy Distributions and Spectroscopy
Alonso-Herrero, Almudena; Díaz-Santos, Tanio; Asensio Ramos, Andrés +9 more
We used the CLUMPY torus models and a Bayesian approach to fit the infrared spectral energy distributions and ground-based high angular resolution mid-infrared spectroscopy of 13 nearby Seyfert galaxies. This allowed us to put tight constraints on torus model parameters such as the viewing angle i, the radial thickness of the torus Y, the angular …
Feedback in Luminous Obscured Quasars
Ho, Luis C.; Barth, Aaron J.; Greene, Jenny E. +1 more
We use spatially resolved long-slit spectroscopy from Magellan to investigate the extent, kinematics, and ionization structure in the narrow-line regions of 15 luminous, obscured quasars with z < 0.5. Increasing the dynamic range in luminosity by an order of magnitude, as well as improving the depth of existing observations by a similar factor,…
Very Strong Emission-line Galaxies in the WFC3 Infrared Spectroscopic Parallel Survey and Implications for High-redshift Galaxies
Scarlata, C.; Shim, H.; Malkan, M. +13 more
The WFC3 Infrared Spectroscopic Parallel Survey uses the Hubble Space Telescope (HST) infrared grism capabilities to obtain slitless spectra of thousands of galaxies over a wide redshift range including the peak of star formation history of the universe. We select a population of very strong emission-line galaxies with rest-frame equivalent widths…
A New Diagnostic of Active Galactic Nuclei: Revealing Highly Absorbed Systems at Redshift >0.3
Dickinson, Mark; Juneau, Stéphanie; Salim, Samir +1 more
We introduce the Mass-Excitation (MEx) diagnostic to identify active galactic nuclei (AGNs) in galaxies at intermediate redshift. In the absence of near-infrared spectroscopy, necessary for using traditional nebular line diagrams at z > 0.4, we demonstrate that combining [O III] λ5007/Hβ and stellar mass successfully distinguishes between star …
Far-infrared Line Deficits in Galaxies with Extreme L_{FIR}/M_{H_{2}} Ratios
Lutz, D.; Genzel, R.; Poglitsch, A. +13 more
We report initial results from the far-infrared fine structure line observations of a sample of 44 local starbursts, Seyfert galaxies, and infrared luminous galaxies obtained with the PACS spectrometer on board Herschel. We show that the ratio between the far-infrared luminosity and the molecular gas mass, {L_{FIR}/{M_{H_{2}}, is a much better pro…