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  • de Graauw, T., et al. (författare)
  • The Herschel-Heterodyne Instrument for the Far-Infrared (HIFI)
  • 2010
  • Ingår i: Astronomy and Astrophysics. - 0004-6361. ; 518:7-8
  • Tidskriftsartikel (refereegranskat)abstract
    • Aims: This paper describes the Heterodyne Instrument for the Far-Infrared (HIFI) that was launched onboard ESA's Herschel Space Observatory in May 2009. Methods: The instrument is a set of 7 heterodyne receivers that are electronically tuneable, covering 480-1250 GHz with SIS mixers and the 1410-1910 GHz range with hot electron bolometer (HEB) mixers. The local oscillator (LO) subsystem comprises a Ka-band synthesizer followed by 14 chains of frequency multipliers and 2 chains for each frequency band. A pair of auto-correlators and a pair of acousto-optical spectrometers process the two IF signals from the dual-polarization, single-pixel front-ends to provide instantaneous frequency coverage of 2 × 4 GHz, with a set of resolutions (125 kHz to 1 MHz) that are better than 0.1 km s-1. Results: After a successful qualification and a pre-launch TB/TV test program, the flight instrument is now in-orbit and completed successfully the commissioning and performance verification phase. The in-orbit performance of the receivers matches the pre-launch sensitivities. We also report on the in-orbit performance of the receivers and some first results of HIFI's operations. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.
  • Ackermann, M., et al. (författare)
  • Fermi Detection of ?-Ray Emission from the M2 Soft X-Ray Flare on 2010 June 12
  • 2012
  • Ingår i: Astrophysical Journal. - 0004-637X. ; 745:2, s. 144
  • Tidskriftsartikel (refereegranskat)abstract
    • The Geostationary Operational Environmental Satellite (GOES) M2-class solar flare, SOL2010-06-12T00: 57, was modest in many respects yet exhibited remarkable acceleration of energetic particles. The flare produced an similar to 50 s impulsive burst of hard X-and gamma-ray emission up to at least 400 MeV observed by the Fermi Gamma-ray Burst Monitor and Large Area Telescope experiments. The remarkably similar hard X-ray and high-energy gamma-ray time profiles suggest that most of the particles were accelerated to energies greater than or similar to 300 MeV with a delay of similar to 10 s from mildly relativistic electrons, but some reached these energies in as little as similar to 3 s. The gamma-ray line fluence from this flare was about 10 times higher than that typically observed from this modest GOES class of X-ray flare. There is no evidence for time-extended >100 MeV emission as has been found for other flares with high-energy gamma-rays.
  • Lis, D. C., et al. (författare)
  • Herschel/HIFI discovery of interstellar chloronium (H2Cl+)
  • 2010
  • Ingår i: Astronomy & Astrophysics. - 0004-6361. ; 521
  • Tidskriftsartikel (refereegranskat)abstract
    • We report the first detection of chloronium, H2Cl+, in the interstellar medium, using the HIFI instrument aboard the Herschel Space Observatory. The 212–101 lines of ortho-H<img src="http://www.aanda.org/articles/aa/abs/2010/13/aa14959-10/aa14959-10_tex_eq1.png" />Cl+ and ortho-H<img src="http://www.aanda.org/articles/aa/abs/2010/13/aa14959-10/aa14959-10_tex_eq2.png" />Cl+ are detected in absorption towards NGC 6334I, and the 111–000 transition of para-H<img src="http://www.aanda.org/articles/aa/abs/2010/13/aa14959-10/aa14959-10_tex_eq1.png" />Cl+ is detected in absorption towards NGC 6334I and Sgr B2(S). The H2Cl+ column densities are compared to those of the chemically-related species HCl. The derived HCl/H2Cl+ column density ratios, ~1–10, are within the range predicted by models of diffuse and dense photon dominated regions (PDRs). However, the observed H2Cl+ column densities, in excess of 1013 cm-2, are significantly higher than the model predictions. Our observations demonstrate the outstanding spectroscopic capabilities of HIFI for detecting new interstellar molecules and providing key constraints for astrochemical models.
  • Werren, John H, et al. (författare)
  • Functional and evolutionary insights from the genomes of three parasitoid Nasonia species.
  • 2010
  • Ingår i: Science. - 0036-8075. ; 327:5963, s. 343-8
  • Tidskriftsartikel (refereegranskat)abstract
    • We report here genome sequences and comparative analyses of three closely related parasitoid wasps: Nasonia vitripennis, N. giraulti, and N. longicornis. Parasitoids are important regulators of arthropod populations, including major agricultural pests and disease vectors, and Nasonia is an emerging genetic model, particularly for evolutionary and developmental genetics. Key findings include the identification of a functional DNA methylation tool kit; hymenopteran-specific genes including diverse venoms; lateral gene transfers among Pox viruses, Wolbachia, and Nasonia; and the rapid evolution of genes involved in nuclear-mitochondrial interactions that are implicated in speciation. Newly developed genome resources advance Nasonia for genetic research, accelerate mapping and cloning of quantitative trait loci, and will ultimately provide tools and knowledge for further increasing the utility of parasitoids as pest insect-control agents.
  • Grieser, M., et al. (författare)
  • Storage ring at HIE-ISOLDE Technical design report
  • 2012
  • Ingår i: The European Physical Journal. Special Topics. - Springer. - 1951-6355. ; 207:1, s. 1-117
  • Forskningsöversikt (refereegranskat)abstract
    • We propose to install a storage ring at an ISOL-type radioactive beam facility for the first time. Specifically, we intend to setup the heavy-ion, low-energy ring TSR at the HIE-ISOLDE facility in CERN, Geneva. Such a facility will provide a capability for experiments with stored secondary beams that is unique in the world. The envisaged physics programme is rich and varied, spanning from investigations of nuclear ground-state properties and reaction studies of astrophysical relevance, to investigations with highly-charged ions and pure isomeric beams. The TSR might also be employed for removal of isobaric contaminants from stored ion beams and for systematic studies within the neutrino beam programme. In addition to experiments performed using beams recirculating within the ring, cooled beams can also be extracted and exploited by external spectrometers for high-precision measurements. The existing TSR, which is presently in operation at the Max-Planck Institute for Nuclear Physics in Heidelberg, is well-suited and can be employed for this purpose. The physics cases as well as technical details of the existing ring facility and of the beam and infrastructure requirements at HIE-ISOLDE are discussed in the present technical design report.
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