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The Abundance, Ortho/Para Ratio, and Deuteration of Water in the High-Mass Star Forming Region NGC 6334 I
M. Emprechtinger, D. C. Lis, R. Rolffs +6
We present Herschel/HIFI observations of 30 transitions of water isotopologues toward the high-mass star forming region NGC 6334 I. The line profiles of H_2^{16}O, H_2^{17}O, H_2^{…
The distribution of warm gas in the G327.3--0.6 massive star-forming region
S. Leurini, F. Wyrowski, F. Herpin +3
Most studies of high-mass star formation focus on massive luminous clumps, but the physical properties of their larger scale environment are poorly known. In this work, we aim at c…
Herschel/HIFI observations of [CII] and [13CII] in PDRs
V. Ossenkopf, M. Röllig, D. A. Neufeld +5
Recently, we introduced detailed isotopic chemistry into the KOSMA-tau model for photon-dominated regions (PDRs) to give theoretical predictions for the abundance of the carbon iso…
Dense Gas in M33 (HerM33es)
C. Buchbender, C. Kramer, M. Gonzalez-Garcia +13
We aim to better understand the emission of molecular tracers of the diffuse and dense gas in giant molecular clouds and the influence that metallicity, optical extinction, density…
First detection of water vapor in a pre-stellar core
Paola Caselli, Eric Keto, Edwin A. Bergin +11
Water is a crucial molecule in molecular astrophysics as it controls much of the gas/grain chemistry, including the formation and evolution of more complex organic molecules in ice…
Spectrally resolved CII emission in M~33 ({\tt HerM33es}): Physical conditions and kinematics around BCLMP 691
J. Braine, P. Gratier, C. Kramer +7
This work presents high spectral resolution observations of the \CII\ line at 158 \micron, one of the major cooling lines of the interstellar medium, taken with the HIFI heterodyne…
Hydrogen Fluoride in High-Mass Star-forming Regions
Martin Emprechtinger, Raquel R. Monje, Floris F. S. van der Tak +5
Hydrogen fluoride has been established to be an excellent tracer of molecular hydrogen in diffuse clouds. In denser environments, however, the HF abundance has been shown to be app…
Cool and warm dust emission from M33 (HerM33es)
E. M. Xilouris, F. S. Tabatabaei, M. Boquien +24
We study the far-infrared emission from the nearby spiral galaxy M33 in order to investigate the dust physical properties such as the temperature and the luminosity density across…
Herschel Search for O2 Toward the Orion Bar
Gary J. Melnick, Volker Tolls, Paul F. Goldsmith +15
We report the results of a search for molecular oxygen (O2) toward the Orion Bar, a prominent photodissociation region at the southern edge of the HII region created by the luminou…
Kinematics of the inner thousand AU region around the young massive star AFGL 2591-VLA3: a massive disk candidate?
K. -S. Wang, F. F. S. van der Tak, M. R. Hogerheijde
[Context] Recent detections of disks around young high-mass stars support the idea of massive star formation through accretion rather than coalescence, but the detailed kinematics…
The first results from the Herschel-HIFI mission
Floris van der Tak
This paper contains a summary of the results from the first years of observations with the HIFI instrument onboard ESA's Herschel space observatory. The paper starts by outlining t…
The massive protostar W43-MM1 as seen by Herschel-HIFI water spectra: high turbulence and accretion luminosity
F. Herpin, L. Chavarria, F. van der Tak +7
We present Herschel/HIFI observations of fourteen water lines in W43-MM1, a massive protostellar object in the luminous star cluster-forming region W43. We analyze the gas dynamics…
Water in star-forming regions with Herschel (WISH): II. Evolution of 557 GHz 110-101 emission in low-mass protostars
L. E. Kristensen, E. F. van Dishoeck, E. A. Bergin +22
(Abridged) Water is a key tracer of dynamics and chemistry in low-mass protostars, but spectrally resolved observations have so far been limited in sensitivity and angular resoluti…
Using deuterated H3+ and other molecular species to understand the formation of stars and planets
Floris van der Tak
The H3+ ion plays a key role in the chemistry of dense interstellar gas clouds where stars and planets are forming. The low temperatures and high extinctions of such clouds make di…
Multi-line detection of O2 toward rho Oph A
R. Liseau, P. F. Goldsmith, B. Larsson +36
Models of pure gas-phase chemistry in well-shielded regions of molecular clouds predict relatively high levels of molecular oxygen, O2, and water, H2O. Contrary to expectation, the…
Herschel observations of interstellar chloronium
David A. Neufeld, Evelyne Roueff, Ronald L. Snell +21
Using the Herschel Space Observatory's Heterodyne Instrument for the Far-Infrared (HIFI), we have observed para-chloronium (H2Cl+) toward six sources in the Galaxy. We detected int…
Dust and gas power-spectrum in M33 (HERM33ES)
F. Combes, M. Boquien, C. Kramer +18
Power spectra of de-projected images of late-type galaxies in gas and/or dust emission are very useful diagnostics of the dynamics and stability of their interstellar medium. Previ…