104 citations · 643 across the 32 of their papers we have counts for
32 papers
Space as a spectroscopic laboratory: High-resolution spectroscopy of the [C II] hyperfine structure with SOFIA/upGREAT
S. Kabanovic, V. Ossenkopf-Okada, S. Schlemmer +13
The [C II] emission at 158 m is a key cooling line of the interstellar medium and traces gas kinematics in spectrally resolved observations. Its spectral profile is often…
HyGAL: Characterizing the Galactic ISM with observations of hydrides and other small molecules. III. The absorption lines of [O I], CH, and OH
W. -J. Kim, A. M. Jacob, D. A. Neufeld +17
The HyGAL Stratospheric Observatory for Infrared Astronomy (SOFIA) legacy program aims at characterizing the interstellar medium in the Milky Way using hydrides, [C II], and [O I]…
Globules and pillars in Cygnus X IV. Velocity-resolved [OI] 63 mu map of a peculiar proplyd-like object
N. Schneider, S. Dannhauer, E. Keilmann +14
We investigated an isolated, globule-shaped object (0.37x0.11 pc), located near the centre of the Cygnus OB2 cluster and named proplyd #7 in optical observations. The source can be…
The Diamond Ring in Cygnus X: Advanced stage of an expanding bubble of ionised carbon
Simon M. Dannhauer, Sebastian Vider, Nicola Schneider +18
The "Diamond Ring" in Cygnus X, southwest of the DR21 ridge, is a nearly circular structure of 6 pc in diameter, prominent in FIR emission and enclosed by clumpy molecular cl…
Tight correlation of star formation with [Ci] and CO lines across cosmic time
Theodoros Topkaras, Thomas G. Bisbas, Zhi-Yu Zhang +1
Context. Cold molecular gas tracers, such as CI and CO lines, have been widely used to infer specific characteristics of the ISM and to derive star-formation relations among galaxi…
The HI-to-H2 transition in the Draco cloud
Nicola Schneider, Volker Ossenkopf-Okada, Markus Roellig +7
In recent decades, significant attention has been dedicated to analytical and observational studies of the atomic hydrogen (HI) to molecular hydrogen (H2) transition in the interst…
Expansion Signatures in 35 HII Regions traced by SOFIA [CII] Emission
Timothy Faerber, Loren D. Anderson, Matteo Luisi +6
We analyze the expansion signatures of 35 HII regions mapped in [CII] 158 micron emission by the Stratospheric Observatory for Infrared Astronomy (SOFIA). The [CII] emission primar…
[C II]-deficit caused by self-absorption in an ionized carbon-filled bubble in RCW79
Eduard Keilmann, Simon Dannhauer, Slawa Kabanovic +12
Recent spectroscopic observations of the [C II] 158 fine-structure line of ionized carbon (C), using the Stratospheric Observatory for Infrared Astronomy (SOFIA)…
Extended atomic carbon around molecular clouds
V. Ossenkopf-Okada, A. Karska, M. Benedettini +2
Models predict that atomic carbon occurs at the surface and in the process of the formation of molecular clouds, making its fine structure transitions a diagnostic of cloud formati…
Molecular cloud matching in CO and dust in M33 II. Physical properties of giant molecular clouds
Eduard Keilmann, Slawa Kabanovic, Nicola Schneider +8
Understanding mass, size, and surface mass density of giant molecular clouds (GMCs) in galaxies is key to insights into star formation processes. We analyze these in M33 using Hers…
Bright-rimmed clouds in IC 1396 I. Dynamics
Yoko Okada, Slawa Kabanovic, Rolf Güsten +14
We investigate the dynamical and physical structures of bright-rimmed clouds (BRCs) in a nearby HII region. We focused on carbon- and oxygen-bearing species that trace photon-domin…
Molecular Cloud Matching in CO and Dust in M33 I. High-Resolution Hydrogen Column Density Maps from Herschel
Eduard Keilmann, Christof Buchbender, Volker Ossenkopf-Okada +7
This study is aimed to contribute to a more comprehensive understanding of the molecular hydrogen distribution in the galaxy M33 by introducing novel methods for generating high an…
First detection of the [CII] 158 micron line in the intermediate-velocity cloud Draco
N. Schneider, V. Ossenkopf-Okada, E. Keilmann +7
High-latitude intermediate-velocity clouds (IVCs) are part of the Milky Way's HI halo and originate from either a galactic fountain process or extragalactic gas infall. They are pa…
Understanding star formation in molecular clouds IV. Column density PDFs from quiescent to massive molecular clouds
N. Schneider, V. Ossenkopf-Okada, S. Clarke +26
We present N-PDFs of 29 Galactic regions obtained from Herschel imaging at high angular resolution, covering diffuse and quiescent clouds, and those showing low-, intermediate-, an…
The KOSMA- PDR Model -- I. Recent updates to the numerical model of photo-dissociated regions
M. Röllig, V. Ossenkopf-Okada
Numerical models of Photodissociation Regions (PDRs) are an essential tool to quantitatively understand observations of massive star forming regions through simulations. Few mature…
FEEDBACK from the NGC7538 HII region
H. Beuther, N. Schneider, R. Simon +10
Context: How do expanding HII regions interact with their environmental cloud? This is one of the central questions driving the SOFIA legacy program FEEDBACK. Here, we present a ca…
Self-absorption in [CII], CO, and HI in RCW120. Building up a geometrical and physical model of the region
S. Kabanovic, N. Schneider, V. Ossenkopf-Okada +19
Revealing the 3D dynamics of HII regions and their associated molecular clouds is important for understanding the longstanding problem as to how stellar feedback affects the densit…
FEEDBACK: a SOFIA Legacy Program to Study Stellar Feedback in Regions of Massive Star Formation
N. Schneider, R. Simon, C. Guevara +37
FEEDBACK is a SOFIA legacy program dedicated to study the interaction of massive stars with their environment. It performs a survey of 11 galactic high mass star forming regions in…
The PDR structure and kinematics around the compact HII regions S235A and S235C with [CII], [13CII], [OI] and HCO+ line profiles
M. S. Kirsanova, V. Ossenkopf-Okada, L. D. Anderson +11
The aim of the present work is to study structure and gas kinematics in the photodissociation regions (PDRs) around the compact HII regions S235A and S235C. We observe the [CII], […
The structure and characteristic scales of molecular clouds
Sami Dib, Sylvain Bontemps, Nicola Schneider +8
The structure of molecular clouds (MCs) holds important clues on the physical processes that lead to their formation and subsequent evolution. While it is well established that tur…
Bringing high spatial resolution to the Far-infrared -- A giant leap for astrophysics
Hendrik Linz, Henrik Beuther, Maryvonne Gerin +11
The far-infrared (FIR) regime is one of the few wavelength ranges where no astronomical data with sub-arcsecond spatial resolution exist. Neither of the medium-term satellite proje…
The Origin of [CII] 158um Emission toward the HII Region Complex S235
L. D. Anderson, Z. Makai, M. Luisi +9
Although the 2P3/2-2P1/2 transition of [CII] at 158um is known to be an excellent tracer of active star formation, we still do not have a complete understanding of where within sta…
Astro2020: The Cycling of Matter from the Interstellar Medium to Stars and back
Robert Simon, Nicola Schneider, Frank Bigiel +15
Understanding the matter cycle in the interstellar medium of galaxies from the assembly of clouds to star formation and stellar feedback remains an important and exciting field in…
Measuring the filamentary structure of interstellar clouds through wavelets
Volker Ossenkopf-Okada, Rodion Stepanov
The ubiquitous presence of filamentary structures in the interstellar medium asks for an unbiased characterization of their properties including a stability analysis. We propose a…