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9 results on '"Staguhn, Johannes G."'

1. 2 mm GISMO Observations of the Galactic Center. I. Dust Emission

Author

Arendt, Richard G, Staguhn, Johannes G, Dwek, Eliahu, Mark R. Morris, Farhad Yusef-Zadeh, Benford, Dominic J, Kovacs, Attila, and Gonzalez-Quiles, Junellie

Subjects
Astronomy
Abstract

The central molecular zone, covering the inner 1° of the Galactic plane has been mapped at 2mm using the Goddard-IRAM Superconducting 2-Millimeter Observer (GISMO) bolometric camera on the 30 m IRAM telescope. The 21 resolution maps show abundant emission from cold molecular clouds, from star-forming regions, and from one of the Galactic center nonthermal filaments. In this work we use the Herschel Hi-GAL data to model the dust emission across the Galactic center. We find that a single-temperature fit can describe the 160-500 um emission for most lines of sight, if the long-wavelength dust emissivity scales as with 2.25. This dust model is extrapolated to predict the 2 mm dust emission. Subtraction of the model from the GISMO data provides a clearer look at the 2 mm emission of star-forming regions and the brightest nonthermal filament.

Published
2019
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2. THE GISMO TWO-MILLIMETER DEEP FIELD IN GOODS-N

Author

Staguhn, Johannes G., primary, Kovács, Attila, additional, Arendt, Richard G., additional, Benford, Dominic J., additional, Decarli, Roberto, additional, Dwek, Eli, additional, Fixsen, Dale J., additional, Hilton, Gene C., additional, Irwin, Kent D., additional, Jhabvala, Christine A., additional, Karim, Alexander, additional, Leclercq, Samuel, additional, Maher, Stephen F., additional, Miller, Timothy M., additional, Moseley, S. Harvey, additional, Sharp, Elmer H., additional, Walter, Fabian, additional, and Wollack, Edward J., additional

Published
2014
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3. FIRST DETECTIONS OF THE [N II] 122 μm LINE AT HIGH REDSHIFT: DEMONSTRATING THE UTILITY OF THE LINE FOR STUDYING GALAXIES IN THE EARLY UNIVERSE

Author

Ferkinhoff, Carl, primary, Brisbin, Drew, additional, Nikola, Thomas, additional, Parshley, Stephen C., additional, Stacey, Gordon J., additional, Phillips, Thomas G., additional, Falgarone, Edith, additional, Benford, Dominic J., additional, Staguhn, Johannes G., additional, and Tucker, Carol E., additional

Published
2011
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4. STAR AND DUST FORMATION ACTIVITIES IN AzTEC-3, A STARBURST GALAXY ATz= 5.3

Author

Dwek, Eli, primary, Staguhn, Johannes G., additional, Arendt, Richard G., additional, Capak, Peter L., additional, Kovacs, Attila, additional, Benford, Dominic J., additional, Fixsen, Dale, additional, Karim, Alexander, additional, Leclercq, Samuel, additional, Maher, Stephen F., additional, Moseley, Samuel H., additional, Schinnerer, Eva, additional, and Sharp, Elmer H., additional

Published
2011
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5. First Constraints on Source Counts at 350 μm

Author

Khan, Sophia A., primary, Shafer, Richard A., additional, Serjeant, Stephen, additional, Willner, S. P., additional, Pearson, Chris P., additional, Benford, Dominic J., additional, Staguhn, Johannes G., additional, Moseley, S. Harvey, additional, Sumner, Timothy J., additional, Ashby, Matthew L. N., additional, Borys, Colin K., additional, Chanial, Pierre, additional, Clements, David L., additional, Dowell, C. Darren, additional, Dwek, Eli, additional, Fazio, Giovanni G., additional, Kovacs, Attila, additional, Le Floc’h, Emeric, additional, and Silverberg, Robert F., additional

Published
2007
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6. CO(1–0) inz≳ 4 Quasar Host Galaxies: No Evidence for Extended Molecular Gas Reservoirs

Author

Riechers, Dominik A., primary, Walter, Fabian, additional, Carilli, Christopher L., additional, Knudsen, Kirsten K., additional, Lo, K. Y., additional, Benford, Dominic J., additional, Staguhn, Johannes G., additional, Hunter, Todd R., additional, Bertoldi, Frank, additional, Henkel, Christian, additional, Menten, Karl M., additional, Weiss, Axel, additional, Yun, Min S., additional, and Scoville, Nick Z., additional

Published
2006
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7. On the Discovery of the First Galaxy Selected at 350 Microns

Author

Khan, Sophia A., primary, Shafer, Richard A., additional, Benford, Dominic J., additional, Staguhn, Johannes G., additional, Chanial, Pierre, additional, Le Floc'h, Emeric, additional, Babbedge, Thomas S. R., additional, Farrah, Duncan, additional, Moseley, S. Harvey, additional, Dwek, Eli, additional, Clements, David L., additional, Sumner, Timothy J., additional, Ashby, Matthew L. N., additional, Brand, Kate, additional, Brodwin, Mark, additional, Eisenhardt, Peter R., additional, Elston, Richard, additional, Gonzalez, Anthony H., additional, McKenzie, Eric, additional, and Murray, Stephen S., additional

Published
2005
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8. First Constraints on Source Counts at 350 ?m

Author

Khan, Sophia A., Shafer, Richard A., Serjeant, Stephen, Pearson, Chris P., Benford, Dominic J., Staguhn, Johannes G., Moseley, Harvey, Sumner, Timothy J., N, Matthew L., Borys, Colin K., Chanial, Pierre, Clements, David L., Dowell, Darren, Dwek, Eli, Fazio, Giovanni G., Kovacs, Attila, Floc, Emeric Le, and Silverberg, Robert F.

Abstract

We have imaged a ~6 arcmin2 region in the Bootes Deep Field using the 350 mm-optimized second-generation Submillimeter High Angular Resolution Camera (SHARC II), achieving a peak 1 s sensitivity of ~5 mJy. We detect three sources above 3 s, and determine a spurious source detection rate of 1.09 in our maps. In the absence of 5 s detections, we rely on deep 24 mm and 20 cm imaging to deduce which sources are most likely to be genuine, giving two real sources. From this we derive an integral source count of 0.84img1.gif sources arcmin-2 at S > 13 mJy, which is consistent with 350 mm source count models that have an IR-luminous galaxy population evolving with redshift. We use these constraints to consider the future for ground-based short-submillimeter surveys.

Published
2007

9. CO(1-0) in z 4 Quasar Host Galaxies: No Evidence for Extended Molecular Gas Reservoirs

Author

Riechers, Dominik A., Walter, Fabian, Carilli, Christopher L., Knudsen, Kirsten K., Benford, Dominic J., Staguhn, Johannes G., Hunter, Todd R., Bertoldi, Frank, Henkel, Christian, Menten, Karl M., Weiss, Axel, Yun, Min S., and Scoville, Nick Z.

Abstract

We present 12CO(J = 1 - 0) observations of the high-redshift quasi-stellar objects (QSOs) BR 1202-0725 (z = 4.69), PSS J2322+1944 (z = 4.12), and APM 08279+5255 (z = 3.91) using the NRAO Green Bank Telescope (GBT) and the MPIfR Effelsberg 100 m telescope. We detect, for the first time, the CO ground-level transition in BR 1202-0725. For PSS J2322+1944 and APM 08279+5255, our observations result in line fluxes that are consistent with previous NRAO Very Large Array (VLA) observations, but they reveal the full line profiles. We report a typical lensing-corrected velocity-integrated intrinsic 12CO(J = 1 - 0) line luminosity of Limg1.gif = 5 x 1010 K km s-1 pc2 and a typical total H2 mass of M(H2) = 4 x 1010 M for the sources in our sample. The CO/FIR luminosity ratios of these high-z sources follow the same trend as seen for low-z galaxies, leading to a combined solution of log LFIR = (1.39 +- 0.05) log LCO - 1.76. It has previously been suggested that the molecular gas reservoirs in some quasar host galaxies may exhibit luminous, extended 12 CO(J = 1 - 0) components that are not observed in the higher J CO transitions. Using the line profiles and the total intensities of our observations and large velocity gradient (LVG) models based on previous results for higher J CO transitions, we derive that emission from all CO transitions is described well by a single gas component in which all molecular gas is concentrated in a compact nuclear region. Thus, our observations and models show no indication of a luminous extended, low surface brightness molecular gas component in any of the high-redshift QSOs in our sample. If such extended components exist, their contribution to the overall luminosity is limited to at most 30%.

Published
2006

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