170 citations · 1.6k across the 33 of their papers we have counts for
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An HST Survey of Protostellar Outflow Cavities: Does Feedback Clear Envelopes?
Nolan M. Habel, S. Thomas Megeath, Joseph Jon Booker +10
We study protostellar envelope and outflow evolution using Hubble Space Telescope NICMOS or WFC3 images of 304 protostars in the Orion Molecular clouds. These near-IR images resolv…
Distribution of methanol and cyclopropenylidene around starless cores
S. Spezzano, P. Caselli, J. E. Pineda +3
Context. The spatial distribution of molecules around starless cores is a powerful tool for studying the physics and chemistry governing the earliest stages of star formation. Aims…
An APEX survey of outflow and infall toward the youngest protostars in Orion
Z. Nagy, A. Menechella, S. T. Megeath +7
We aim to characterize the outflow properties of a sample of early Class 0 phase low-mass protostars in Orion first identified by the Herschel Space Observatory. We also look for s…
The chemical structure of the very young starless core L1521E
Z. Nagy, S. Spezzano, P. Caselli +5
L1521E is a dense starless core in Taurus that was found to have relatively low molecular depletion by earlier studies, thus suggesting a recent formation. We aim to characterize t…
Structure of photodissociation fronts in star-forming regions revealed by observations of high-J CO emission lines with Herschel
C. Joblin, E. Bron, C. Pinto +17
In bright photodissociation regions (PDRs) associated to massive star formation, the presence of dense "clumps" that are immersed in a less dense interclump medium is often propose…
Herschel / HIFI spectral line survey of the Orion Bar - Temperature and density differentiation near the PDR surface
Z. Nagy, Y. Choi, V. Ossenkopf-Okada +7
Photon Dominated Regions (PDRs) are interfaces between the mainly ionized and mainly molecular material around young massive stars. Analysis of the physical and chemical structure…
Characterizing the Youngest Herschel-detected Protostars II. Molecular Outflows from the Millimeter and the Far-infrared
John J. Tobin, Amelia M. Stutz, P. Manoj +7
We present CARMA CO (J=1-0) observations and Herschel PACS spectroscopy, characterizing the outflow properties toward extremely young and deeply embedded protostars in the Orion mo…
Herschel/HIFI Spectral Mapping of C, CH, and CH in Orion BN/KL: The Prevailing Role of Ultraviolet Irradiation in CH Formation
Patrick W. Morris, Harshal Gupta, Zsofia Nagy +8
The CH ion is a key species in the initial steps of interstellar carbon chemistry. Its formation in diverse environments where it is observed is not well understood, however, b…
Physical and chemical differentiation of the luminous star-forming region W49A - Results from the JCMT Spectral Legacy Survey
Z. Nagy, F. F. S. van der Tak, G. A. Fuller +1
The massive and luminous star-forming region W49A is a well known Galactic candidate to probe the physical conditions and chemistry similar to those expected in external starburst…
CH observations toward the Orion Bar
Z. Nagy, V. Ossenkopf, F. F. S. Van der Tak +3
CH is one of the first radicals to be detected in the interstellar medium. Its higher rotational transitions have recently become available with the Herschel Space Observatory.…
Spatially extended OH+ emission from the Orion Bar and Ridge
Floris van der Tak, Zsofia Nagy, Volker Ossenkopf +5
We report the first detection of a Galactic source of OH+ line emission: the Orion Bar, a bright nearby photon-dominated region. Line emission is detected over ~1' (0.12 pc), traci…
Herschel/HIFI observations of a new interstellar water maser: the 5(32)-4(41) transition at 620.701 GHz
David A. Neufeld, Yuanwei Wu, Alex Kraus +4
Using the Herschel Space Observatory's Heterodyne Instrument for the Far-Infrared (HIFI), we have performed mapping observations of the 620.701 GHz 5(32)-4(41) transition of ortho-…
The chemistry of ions in the Orion Bar I. - CH+, SH+, and CF+: The effect of high electron density and vibrationally excited H2 in a warm PDR surface
Z. Nagy, F. F. S. Van der Tak, V. Ossenkopf +8
The abundances of interstellar CH+ and SH+ are not well understood as their most likely formation channels are highly endothermic. Using data from Herschel, we study the formation…
Extended warm and dense gas towards W49A: starburst conditions in our Galaxy?
Z. Nagy, F. F. S. van der Tak, G. A. Fuller +2
The star formation rates in starburst galaxies are orders of magnitude higher than in local star-forming regions, and the origin of this difference is not well understood. We use s…
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…
Detection of HF emission from the Orion Bar
F. F. S. van der Tak, V. Ossenkopf, Z. Nagy +3
The clumpy density structure of photon-dominated regions is well established, but the physical properties of the clumps and of the surrounding interclump medium are only approximat…
Herschel Measurements of Molecular Oxygen in Orion
Paul F. Goldsmith, Rene Liseau, Tom A. Bell +31
We report observations of three rotational transitions of molecular oxygen (O2) in emission from the H2 Peak 1 position of vibrationally excited molecular hydrogen in Orion. We obs…
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…