166 citations · 1.2k across the 21 of their papers we have counts for
17 papers · 1 filter
An 18-25 GHz spectroscopic survey of dense cores in the Chamaeleon I molecular cloud
Dariusz C. Lis, William D. Langer, Jorge L. Pineda +9
We extend the survey for organics in the southern hemisphere by observing two cores in the Chamaeleon complex using NASA's Deep Space Network 70-m antenna in Canberra, Australia, o…
Nitrogen Abundance Distribution in the inner Milky Way
Jorge L. Pineda, Shinji Horiuchi, L. D. Anderson +9
We combine a new Galactic plane survey of Hydrogen Radio Recombination Lines (RRLs) with far-infrared (FIR) surveys of ionized Nitrogen, N+, to determine Nitrogen abundance across…
Thermal Pressure in Diffuse H2 Gas Measured by Herschel [C II] Emission and FUSE UV H2 Absorption
Thangasamy Velusamy, William Langer, Paul Goldsmith +1
UV absorption studies with FUSE have observed H2 molecular gas in translucent and diffuse clouds. Observations of the 158 micron [C II] fine structure line with Herschel also trace…
Ionized gas at the edge of the Central Molecular Zone
W. D. Langer, P. F. Goldsmith, J. L. Pineda +3
To determine the properties of the ionized gas at the edge of the CMZ near Sgr E we observed a small portion of the edge of the CMZ near Sgr E with spectrally resolved [C II] 158 m…
The scale height of gas traced by [CII] in the Galactic plane
W. D. Langer, J. L. Pineda, T. Velusamy
The distribution of various interstellar gas components and the pressure in the interstellar medium (ISM) is a result of the interplay of different dynamical mechanisms and energy…
A Herschel [C II] Galactic plane survey II: CO-dark H2 in clouds
W. D. Langer, T. Velusamy, J. L. Pineda +2
ABRIDGED: Context: HI and CO large scale surveys of the Milky Way trace the diffuse atomic clouds and the dense shielded regions of molecular hydrogen clouds. However, until recent…
Jets and Wide Angle Outflows in Cepheus E: New Evidence from Spitzer
T. Velusamy, W. D. Langer, M. S. N. Kumar +1
In some protostellar objects both wide angle outflows and collimated jets are seen, while in others only one is observed. Spitzer provides unprecedented sensitivity in the infrared…
Detection of OH and HO towards Orion~KL
H. Gupta, P. Rimmer, J. C. Pearson +76
We report observations of the reactive molecular ions OH, HO, and HO towards Orion KL with Herschel/HIFI. All three fine-structure transitions of OH…
Nitrogen hydrides in the cold envelope of IRAS16293-2422
Pierre Hily-Blant, Sébastien Maret, Aurore Bacmann +4
Nitrogen is the fifth most abundant element in the Universe, yet the gas-phase chemistry of N-bearing species remains poorly understood. Nitrogen hydrides are key molecules of nitr…
A Sample of [CII] Clouds Tracing Dense Clouds in Weak FUV Fields observed by Herschel
Jorge L. Pineda, Thangasamy Velusamy, William D. Langer +4
The [CII] fine--structure line at 158um is an excellent tracer of the warm diffuse gas in the ISM and the interfaces between molecular clouds and their surrounding atomic and ioniz…
Herschel/HIFI observations of spectrally resolved methylidyne signatures toward the high-mass star-forming core NGC6334I
M. H. D. van der Wiel, F. F. S. van der Tak, D. C. Lis +65
In contrast to extensively studied dense star-forming cores, little is known about diffuse gas surrounding star-forming regions. We study molecular gas in the high-mass star-formin…
C detection of warm dark gas in diffuse clouds
W. D. Langer, T. Velusamy, J. L. Pineda +3
We present the first results of the Herschel open time key program, Galactic Observations of Terahertz C (GOT C+) survey of the [CII] fine-structure line at 1.9 THz (158 micron…
Herschel observations of EXtra-Ordinary Sources: the present and future of spectral surveys with Herschel/HIFI
E. A. Bergin, T. G. Phillips, C. Comito +56
We present initial results from the Herschel GT key program: Herschel observations of EXtra-Ordinary Sources (HEXOS) and outline the promise and potential of spectral surveys with…
Herschel observations of extra-ordinary sources: Detecting spiral arm clouds by CH absorption lines
S. -L. Qin, P. Schilke, C. Comito +67
We have observed CH absorption lines () against the continuum source Sgr~B2(M) using the \textit{Herschel}/HIFI instrument. With the high spectral…
Herschel/HIFI discovery of interstellar chloronium (HCl)
D. C. Lis, J. C. Pearson, D. A. Neufeld +102
We report the first detection of chloronium, HCl, in the interstellar medium, using the HIFI instrument aboard the \emph{Herschel} Space Observatory. The li…
Herschel observations of ortho- and para-oxidaniumyl (H2O+) in spiral arm clouds toward Sgr B2(M)
P. Schilke, C. Comito, H. S. P. Mueller +55
H2O+ has been observed in its ortho- and para- states toward the massive star forming core Sgr B2(M), located close to the Galactic center. The observations show absorption in all…
The CHESS chemical Herschel surveys of star forming regions: Peering into the protostellar shock L1157-B1. I. Shock chemical complexity
C. Codella, B. Lefloch, C. Ceccarelli +2
We present the first results of the unbiased survey of the L1157-B1 bow shock, obtained with HIFI in the framework of the key program Chemical Herschel surveys of star forming regi…