C. Leinz

Publications (7)0 Total impact

• Source

  Available from: Thomas Klein

  Article: First results on Martian carbon monoxide from Herschel/HIFI observations

  P. Hartogh, M. I. Błęcka, C. Jarchow, H. Sagawa, E. Lellouch, M. de Val-Borro, M. Rengel, A. S. Medvedev, B. M. Swinyard, R. Moreno, [......], E. Verdugo, C. Waelkens, A. Lorenzani, G. Tofani, E. Natale, J. Pearson, T Klein, C. Leinz, R. Güsten, C. Kramer
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  ABSTRACT: We report on the initial analysis of Herschel/HIFI carbon monoxide (CO) observations of the Martian atmosphere performed between 11 and 16 April 2010. We selected the (7-6) rotational transitions of the isotopes ^{13}CO at 771 GHz and C^{18}O at 768 GHz in order to retrieve the mean vertical profile of temperature and the mean volume mixing ratio of carbon monoxide. The derived temperature profile agrees within less than 5 K with general circulation model (GCM) predictions up to an altitude of 45 km, however, show about 12-15 K lower values at 60 km. The CO mixing ratio was determined as 980 \pm 150 ppm, in agreement with the 900 ppm derived from Herschel/SPIRE observations in November 2009. Comment: Accepted for publication in Astronomy and Astrophysics (special issue on HIFI first results); minor changes to match published version
  07/2010;
• Source

  Available from: Thomas Klein

  Article: Detection of interstellar oxidaniumyl: abundant H2O+ towards the star-forming regions DR21, Sgr B2, and NGC6334

  V. Ossenkopf, H. S. P. Müller, D. C. Lis, P. Schilke, T. A. Bell, S. Bruderer, E. Bergin, C. Ceccarelli, C. Comito, J. Stutzki, [......], C. Vastel, S. Viti, V. Wakelam, A. Walters, S Wang, N. Whyborn, M. van der Wiel, H. W. Yorke, S Yu, J. Zmuidzinas
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  ABSTRACT: We identify a prominent absorption feature at 1115 GHz, detected in first HIFI spectra towards high-mass star-forming regions, and interpret its astrophysical origin. The characteristic hyperfine pattern of the H2O+ ground-state rotational transition, and the lack of other known low-energy transitions in this frequency range, identifies the feature as H2O+ absorption against the dust continuum background and allows us to derive the velocity profile of the absorbing gas. By comparing this velocity profile with velocity profiles of other tracers in the DR21 star-forming region, we constrain the frequency of the transition and the conditions for its formation. In DR21, the velocity distribution of H2O+ matches that of the [CII] line at 158\mu\m and of OH cm-wave absorption, both stemming from the hot and dense clump surfaces facing the HII-region and dynamically affected by the blister outflow. Diffuse foreground gas dominates the absorption towards Sgr B2. The integrated intensity of the absorption line allows us to derive lower limits to the H2O+ column density of 7.2e12 cm^-2 in NGC 6334, 2.3e13 cm^-2 in DR21, and 1.1e15 cm^-2 in Sgr B2. Comment: Accepted for publication in A&A
  05/2010;
• Article: Astronomical Telescopes and Instrumentation: Synergies Between Ground and Space

  R. Güsten, A. Baryshev, A. Bell, A. Belloche, U. Graf, H. Hafok, S. Heyminck, S. Hochgürtel, C. E. Honingh, K. Jacobs, [......], D. Muders, F. Pacek, D. Rabanus, F. Schäfer, P. Schilke, G. Schneider, J. Stutzki, G. Wieching, A. Wunsch, F. Wyrowski
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  ABSTRACT: We report on developments of submillimeter heterodyne arrays for high resolution spectroscopy with APEX. Shortly, we will operate state-of-the-art instruments in all major atmospheric windows accessible from Llano de Chajnantor. CHAMP+, a dual-color 2×7 element heterodyne array for operation in the 450 μm and 350 μm atmospheric windows is in operation since late 2007. With its state-of-the-art SIS detectors and wide tunable local oscillators, its cold optics with single sideband filters and with 3 GHz of processed IF bandwidth per pixel, CHAMP+ does provide outstanding observing capabilities. The Large APEX sub-Millimeter Array (LAsMA) is in the final design phase, with an installation goal in 2009. The receiver will operate 7 and 19 pixels in the lower submillimeter windows, 285-375 GHz and 385-520 GHz, respectively. The front-ends are served by an array of digital wideband Fast Fourier Transform spectrometers currently processing up to 32×1.5 (optionally 1.8) GHz of bandwidth. For CHAMP+, we process 2.8 GHz of instantaneous bandwidth (in 16.4 k channels) for each of the 14 pixels.© (2008) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
  08/2008;
• Article: Detection of interstellar oxidaniumyl: Abundant H

  V. Ossenkopf, H. S. P. Müller, D. C. Lis, P. Schilke, T. A. Bell, S. Bruderer, E. Bergin, C. Ceccarelli, C. Comito, J. Stutzki, [......], C. Vastel, S. Viti, V. Wakelam, A. Walters, S Wang, N. Whyborn, M. van der Wiel, H. W. Yorke, S Yu, J. Zmuidzinas
  http://dx.doi.org/10.1051/0004-6361/201014577.
• Article: The

  Th. de Graauw, F.P. Helmich, T. G. Phillips, J. Stutzki, E. Caux, N. D. Whyborn, P. Dieleman, P. R. Roelfsema, H. Aarts, R. Assendorp, [......], J. S. Ward, P. Wesselius, W. Wild, S. Wulff, H.-J. Wunsch, X. Tielens, P. Zaal, H. Zirath, J. Zmuidzinas, F. Zwart
  http://dx.doi.org/10.1051/0004-6361/201014698.
• Article: The Herschel-Heterodyne Instrument for the Far-Infrared (HIFI)

  T. de Graauw, F.P. Helmich, T. G. Phillips, J. Stutzki, E. Caux, N. D. Whyborn, P. Dieleman, P. Roelfsema, H. Aarts, R. Assendorp, [......], J. S. Ward, P. Wesselius, W. Wild, W. Wulff, H.-J. Wunsch, X. Tielens, P. Zaal, H. Zirath, J. Zmuidzinas, F. Zwart
  Astronomy and Astrophysics, v.518 (2010).
• Source

  Available from: Thomas Klein

  Article: Herschel/HIFI In-flight Commissioning and Performance

  D. Teyssier, C. Risacher, P. Dieleman, W. Laauwen, A. De Jonge, J. Braine, M. Caris, O. Coeur-Joly, B. Delforge, F. Helmich, [......], J. Kooi, C. Leinz, K. Edwards, A. Marston, P. Morris, M. Olberg, V. Ossenkopf, J. Pearson, P. Roelfsema, R. Shipman
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  ABSTRACT: The Herschel Space Observatory was successfully launched on the 14th of May, 2009, lifting into space the Heterodyne Instrument for the Far-Infrared (HIFI). After the standard early orbit operations on the Space-craft, the instrument was switched on for the first time on the 24th of May, kicking off an instrument Commissioning period of more than a month and a half. We present here the outcome of this Commissioning campaign, including the measured in-flight performance of the instrument. Among the challenges encountered during this period was the need to optimize the stability of the signal provided by the Local Oscillator (LO) chains in some of the frequency bands, in particular that covering the singly Ionized Carbon (C+) line at the upper edge of the HIFI range, and one of the backbones of the science program of the instrument. The same concept also allowed significant improvements in the upper end of the 3b LO chain. Another noticeable achievement was the very good co-alignment measured between the mixer beams in the respective H and V polarizations offered by HIFI, allowing for more than a simple build-in redundancy, as the observing efficiency will really benefits from the combination of the two mixers.
  Twenty-First International Symposium on Space Terahertz Technology, held March 23-25, 2010 at Oxford University's Said Business Center and the STFC Rutherford Appleton Laboratory, Oxford, UK. National Radio Astronomy Observatory (NRAO), 2010., p.40-45.