M. Röllig
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View article: Globules and pillars in Cygnus X. IV. Velocity-resolved [OI] 63 μm map of a peculiar proplyd-like object
Globules and pillars in Cygnus X. IV. Velocity-resolved [OI] 63 μm map of a peculiar proplyd-like object Open
A proplyd is defined as a young stellar object (YSO) surrounded by a circumstellar disk of gas and dust and embedded in a molecular envelope undergoing photo-evaporation by external ultraviolet (UV) radiation. Since the discovery of the Or…
View article: Observation of an accreting planetary-mass companion with signs of disc–disc interaction in Orion
Observation of an accreting planetary-mass companion with signs of disc–disc interaction in Orion Open
Young (≲10 Myr) planetary-mass companions (PMCs) provide valuable insights into the formation and early evolution of planetary systems. To date, only a dozen such objects have been identified through direct imaging. Using JWST/NIRCam obser…
View article: Expansion Signatures in 35 H <scp>II</scp> Regions Traced by SOFIA [C <scp>II</scp>] Emission
Expansion Signatures in 35 H <span>II</span> Regions Traced by SOFIA [C <span>II</span>] Emission Open
We analyze the expansion signatures of 35 H II regions mapped in [C II ] 158 μ m emission by the Stratospheric Observatory for Infrared Astronomy. The [C II ] emission primarily traces photodissociation regions (PDRs) at the transition bet…
View article: Measurement of the inhomogeneity of the KATRIN tritium source electric potential by high-resolution spectroscopy of conversion electrons from $$\mathbf {^{83m}}$$Kr
Measurement of the inhomogeneity of the KATRIN tritium source electric potential by high-resolution spectroscopy of conversion electrons from $$\mathbf {^{83m}}$$Kr Open
View article: The HI-to-H<sub>2</sub> transition in the Draco cloud
The HI-to-H<sub>2</sub> transition in the Draco cloud Open
In recent decades, significant attention has been dedicated to analytical and observational studies of the atomic hydrogen (H I ) to molecular hydrogen (H 2 ) transition in the interstellar medium. We focussed on the Draco diffuse cloud to…
View article: Solar C/O ratio in planet-forming gas at 1 au in a highly irradiated disk
Solar C/O ratio in planet-forming gas at 1 au in a highly irradiated disk Open
The chemical composition of exoplanets is thought to be influenced by the composition of the disks in which they form. JWST observations have unveiled a variety of species in numerous nearby disks, showing significant variations in the C/O…
View article: [C II]-deficit caused by self-absorption in an ionized carbon-filled bubble in RCW79
[C II]-deficit caused by self-absorption in an ionized carbon-filled bubble in RCW79 Open
Recent spectroscopic observations of the [C II ] 158 μm fine-structure line of ionized carbon (C + ), using the Stratospheric Observatory for Infrared Astronomy (SOFIA), have revealed expanding [C II ] shells in Galactic H II regions. We r…
View article: Bright-rimmed clouds in IC 1396 I. Dynamics
Bright-rimmed clouds in IC 1396 I. Dynamics Open
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-dominated regions (PDRs) and warm molecular cloud surfaces in or…
View article: Bright-rimmed clouds in IC 1396
Bright-rimmed clouds in IC 1396 Open
Aims . We investigate the dynamical and physical structures of bright-rimmed clouds (BRCs) in a nearby H II region. We focused on carbon- and oxygen-bearing species that trace photon-dominated regions (PDRs) and warm molecular cloud surfac…
View article: PDRs4All
PDRs4All Open
Context. Mid-infrared emission features are important probes of the properties of ionized gas and hot or warm molecular gas, which are difficult to probe at other wavelengths. The Orion Bar photodissociation region (PDR) is a bright, nearb…
View article: PDRs4All
PDRs4All Open
Context. One of the main problems in astrochemistry is determining the amount of sulfur in volatiles and refractories in the interstellar medium. The detection of the main sulfur reservoirs (icy H 2 S and atomic gas) has been challenging, …
View article: PDRs4All IX. Sulfur elemental abundance in the Orion Bar
PDRs4All IX. Sulfur elemental abundance in the Orion Bar Open
One of the main problems in astrochemistry is determining the amount of sulfur in volatiles and refractories in the interstellar medium. The detection of the main sulfur reservoirs (icy H$_2$S and atomic gas) has been challenging, and esti…
View article: PDRs4All VIII: Mid-IR emission line inventory of the Orion Bar
PDRs4All VIII: Mid-IR emission line inventory of the Orion Bar Open
Mid-infrared emission features probe the properties of ionized gas, and hot or warm molecular gas. The Orion Bar is a frequently studied photodissociation region (PDR) containing large amounts of gas under these conditions, and was observe…
View article: PDRs4All
PDRs4All Open
Context . JWST has taken the sharpest and most sensitive infrared (IR) spectral imaging observations ever of the Orion Bar photodis-sociation region (PDR), which is part of the nearest massive star-forming region the Orion Nebula, and ofte…
View article: First detection of the [CII] 158 µm line in the intermediate-velocity cloud Draco
First detection of the [CII] 158 µm line in the intermediate-velocity cloud Draco Open
High-latitude intermediate-velocity clouds (IVCs) are part of the Milky Way’s H I halo and originate from either a galactic fountain process or extragalactic gas infall. They are partly molecular and can most of the time be identified in C…
View article: A far-ultraviolet-driven photoevaporation flow observed in a protoplanetary disk
A far-ultraviolet-driven photoevaporation flow observed in a protoplanetary disk Open
Most low-mass stars form in stellar clusters that also contain massive stars, which are sources of far-ultraviolet (FUV) radiation. Theoretical models predict that this FUV radiation produces photo-dissociation regions (PDRs) on the surfac…
View article: A far-ultraviolet–driven photoevaporation flow observed in a protoplanetary disk
A far-ultraviolet–driven photoevaporation flow observed in a protoplanetary disk Open
Most low-mass stars form in stellar clusters that also contain massive stars, which are sources of far-ultraviolet (FUV) radiation. Theoretical models predict that this FUV radiation produces photodissociation regions (PDRs) on the surface…
View article: OH as a probe of the warm-water cycle in planet-forming disks
OH as a probe of the warm-water cycle in planet-forming disks Open
View article: PDRs4All
PDRs4All Open
Context. Interstellar dust particles, in particular carbonaceous nano-grains (like polycyclic aromatic hydrocarbons, fullerenes, and amorphous hydrogenated carbon), are critical players for the composition, energy budget, and dynamics of t…
View article: PDRs4All. V. Modelling the dust evolution across the illuminated edge of the Orion Bar
PDRs4All. V. Modelling the dust evolution across the illuminated edge of the Orion Bar Open
We study the emission of dust grains within the Orion Bar - a well-known, highly far-UV (FUV)-irradiated PDR. The Orion Bar because of its edge-on geometry provides an exceptional benchmark for characterizing dust evolution and the associa…
View article: OH as a probe of the warm water cycle in planet-forming disks
OH as a probe of the warm water cycle in planet-forming disks Open
Water is a key ingredient for the emergence of life as we know it. Yet, its destruction and reformation in space remains unprobed in warm gas. Here, we detect the hydroxyl radical (OH) emission from a planet-forming disk exposed to externa…
View article: PDRs4All
PDRs4All Open
Context . The James Webb Space Telescope (JWST) has captured the most detailed and sharpest infrared (IR) images ever taken of the inner region of the Orion Nebula, the nearest massive star formation region, and a prototypical highly irrad…
View article: PDRs4All IV. An embarrassment of riches: Aromatic infrared bands in the Orion Bar
PDRs4All IV. An embarrassment of riches: Aromatic infrared bands in the Orion Bar Open
(Abridged) Mid-infrared observations of photodissociation regions (PDRs) are dominated by strong emission features called aromatic infrared bands (AIBs). The most prominent AIBs are found at 3.3, 6.2, 7.7, 8.6, and 11.2 $μ$m. The most sens…
View article: PDRs4All II: JWST's NIR and MIR imaging view of the Orion Nebula
PDRs4All II: JWST's NIR and MIR imaging view of the Orion Nebula Open
The JWST has captured the most detailed and sharpest infrared images ever taken of the inner region of the Orion Nebula, the nearest massive star formation region, and a prototypical highly irradiated dense photo-dissociation region (PDR).…
View article: Search for keV-scale sterile neutrinos with the first KATRIN data
Search for keV-scale sterile neutrinos with the first KATRIN data Open
View article: PDRs4All
PDRs4All Open
Context . Mid-infrared observations of photodissociation regions (PDRs) are dominated by strong emission features called aromatic infrared bands (AIBs). The most prominent AIBs are found at 3.3, 6.2, 7.7, 8.6, and 11.2 µm. The most sensiti…
View article: Formation of the methyl cation by photochemistry in a protoplanetary disk
Formation of the methyl cation by photochemistry in a protoplanetary disk Open
View article: High-angular-resolution NIR view of the Orion Bar revealed by Keck/NIRC2
High-angular-resolution NIR view of the Orion Bar revealed by Keck/NIRC2 Open
Context . Nearby photo-dissociation regions (PDRs), where the gas and dust are heated by the far-ultraviolet (FUV) irradiation emitted from stars, are ideal templates with which to study the main stellar feedback processes. Aims . With thi…
View article: High angular resolution near-IR view of the Orion Bar revealed by Keck/NIRC2
High angular resolution near-IR view of the Orion Bar revealed by Keck/NIRC2 Open
Nearby Photo-Dissociation Regions (PDRs), where the gas and dust are heated by the far UV-irradiation emitted from stars, are ideal templates to study the main stellar feedback processes. With this study we aim to probe the detailed struct…
View article: The KOSMA-<i>τ</i>PDR model
The KOSMA-<i>τ</i>PDR model Open
Numerical models of photodissociation regions (PDRs) are an essential tool to quantitatively understand observations of massive star forming regions through simulations. Few mature PDR models are available and the Cologne KOSMA- τ PDR mode…