J. H. Black
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View article: Exploring the role of peers in addressing the toxic drug crisis in emergency departments
Exploring the role of peers in addressing the toxic drug crisis in emergency departments Open
Introduction: Health systems across Canada are facing high numbers of patients who use substances, have a diagnosed substance use disorder, or are experiencing a toxic drug poisoning, necessitating innovative approaches to care. The articl…
View article: PDRs4All
PDRs4All Open
Context . The methylidyne cation (CH + ) and the methyl cation (CH 3 + ) are building blocks of organic molecules in the ultraviolet (UV) irradiated gas, yet their coupled formation and excitation mechanisms mostly remain unprobed. The Jam…
View article: PDRs4All XI. Detection of infrared CH$^+$ and CH$_3^+$ rovibrational emission in the Orion Bar and disk d203-506: evidence of chemical pumping
PDRs4All XI. Detection of infrared CH$^+$ and CH$_3^+$ rovibrational emission in the Orion Bar and disk d203-506: evidence of chemical pumping Open
The methylidyne cation (CH$^+$) and the methyl cation (CH$_3^+$) are building blocks of organic molecules, yet their coupled formation and excitation mechanisms remain mainly unprobed. The James Webb Space Telescope (JWST), with its high s…
View article: OH mid-infrared emission as a diagnostic of H<sub>2</sub>O UV photodissociation
OH mid-infrared emission as a diagnostic of H<sub>2</sub>O UV photodissociation Open
Context. The Mid-InfraRed Instrument (MIRI) on board the James Webb Space Telescope (JWST) gives unique access to the physical and chemical structure of inner disks (<10 au), where the majority of the planets are forming. However, the inte…
View article: PDRs4All
PDRs4All Open
The gas-phase abundance of carbon, x C = [C/H] gas = x C + + x C 0 + x CO + … , and its depletion factors are essential parameters for understanding the gas and solid compositions that are ultimately incorporated into (exo)planets. The maj…
View article: Preparing for Fully Autonomous Vehicles in Australian Cities: Land-Use Planning—Adapting, Transforming, and Innovating
Preparing for Fully Autonomous Vehicles in Australian Cities: Land-Use Planning—Adapting, Transforming, and Innovating Open
A literature review found no evidence that there is any understanding of what it takes to plan land uses for the transition to fully autonomous vehicles at the precinct level, nor any conceptual agreement on the nature of the transformatio…
View article: OH mid-infrared emission as a diagnostic of H$_2$O UV photodissociation. III. Application to planet-forming disks
OH mid-infrared emission as a diagnostic of H$_2$O UV photodissociation. III. Application to planet-forming disks Open
JWST gives a unique access to the physical and chemical structure of inner disks ($<10$~au), where the majority of the planets are forming. However, the interpretation of mid-infrared (mid-IR) spectra requires detailed thermo-chemical mode…
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: 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: Protonated acetylene in the <i>z</i> = 0.89 molecular absorber toward PKS 1830-211
Protonated acetylene in the <i>z</i> = 0.89 molecular absorber toward PKS 1830-211 Open
We report the first interstellar identification of protonated acetylene, C 2 H 3 + , a fundamental hydrocarbon, in the z = 0.89 molecular absorber toward the gravitationally lensed quasar PKS 1830–211. The molecular species is identified f…
View article: Protonated acetylene in the z=0.89 molecular absorber toward PKS1830-211
Protonated acetylene in the z=0.89 molecular absorber toward PKS1830-211 Open
We report the first interstellar identification of protonated acetylene, C2H3+, a fundamental hydrocarbon, in the z=0.89 molecular absorber toward the gravitationally lensed quasar PKS1830-211. The molecular species is identified from clea…
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: JOYS+: Mid-infrared detection of gas-phase SO<sub>2</sub> emission in a low-mass protostar
JOYS+: Mid-infrared detection of gas-phase SO<sub>2</sub> emission in a low-mass protostar Open
Context. Thanks to the Mid-InfraRed Instrument (MIRI) on the James Webb Space Telescope (JWST), our ability to observe the star formation process in the infrared has greatly improved. Due to its unprecedented spatial and spectral resolutio…
View article: JOYS+: mid-infrared detection of gas-phase SO$_2$ emission in a low-mass protostar. The case of NGC 1333 IRAS2A: hot core or accretion shock?
JOYS+: mid-infrared detection of gas-phase SO$_2$ emission in a low-mass protostar. The case of NGC 1333 IRAS2A: hot core or accretion shock? Open
JWST/MIRI has sharpened our infrared eyes toward the star formation process. This paper presents the first mid-infrared detection of gaseous SO$_2$ emission in an embedded low-mass protostellar system. MIRI-MRS observations of the low-mass…
View article: PDRs4All III: JWST's NIR spectroscopic view of the Orion Bar
PDRs4All III: JWST's NIR spectroscopic view of the Orion Bar Open
(Abridged) We investigate the impact of radiative feedback from massive stars on their natal cloud and focus on the transition from the HII region to the atomic PDR (crossing the ionisation front (IF)), and the subsequent transition to the…
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: 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: Nurturing Undergraduate Research: Reflections on the Moravian Undergraduate Conference in Medieval and Early Modern Studies, 2006-2021
Nurturing Undergraduate Research: Reflections on the Moravian Undergraduate Conference in Medieval and Early Modern Studies, 2006-2021 Open
The authors reflect on fifteen undergraduate conferences featuring over 1200 student papers. Several patterns have stood out: the vibrancy of interest in medieval and early modern studies, the extent to which students’ topical interests r…