Fergus R. Donnan
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View article: The PAH 3.4 micron feature as a tracer of shielding in the Orion Bar and NGC 6240
The PAH 3.4 micron feature as a tracer of shielding in the Orion Bar and NGC 6240 Open
We have carried out a detailed analysis of the 3.4 μm spectral feature arising from Polycyclic Aromatic Hydrocarbons (PAH), using JWST archival data. For the first time in an external galaxy (NGC 6240), we have identified two distinct spec…
View article: The PAH 3.4 micron feature as a tracer of shielding in the Orion Bar and NGC 6240
The PAH 3.4 micron feature as a tracer of shielding in the Orion Bar and NGC 6240 Open
We have carried out a detailed analysis of the 3.4 micron spectral feature arising from Polycyclic Aromatic Hydrocarbons (PAH), using JWST archival data. For the first time in an external galaxy (NGC 6240), we have identified two distinct …
View article: The Interstellar Medium in I Zw 18 Seen with JWST/MIRI. II. Warm Molecular Hydrogen and Warm Dust
The Interstellar Medium in I Zw 18 Seen with JWST/MIRI. II. Warm Molecular Hydrogen and Warm Dust Open
We present JWST/MIRI spectra from the Medium-resolution Spectrometer of I Zw 18, a nearby dwarf galaxy with a metallicity of ∼3% Solar. Here, we investigate warm molecular hydrogen, H 2 , observed in spectra extracted in ∼120 pc apertures …
View article: Shock-driven heating in the circumnuclear star-forming regions of NGC 7582: insights from <i>JWST</i> NIRSpec and MIRI/MRS spectroscopy
Shock-driven heating in the circumnuclear star-forming regions of NGC 7582: insights from <i>JWST</i> NIRSpec and MIRI/MRS spectroscopy Open
We present combined James Webb Space Telescope (JWST) NIRSpec and MIRI/MRS integral field spectroscopy data of the nuclear and circumnuclear regions of the highly dust obscured Seyfert 2 galaxy NGC 7582, which is part of the sample of acti…
View article: The Interstellar Medium in I Zw 18 Seen with JWST/MIRI. I. Highly Ionized Gas
The Interstellar Medium in I Zw 18 Seen with JWST/MIRI. I. Highly Ionized Gas Open
We present JWST/MIRI spectra from the Medium-Resolution Spectrometer of I Zw 18, a nearby dwarf galaxy with a metallicity of ∼3% solar. Its proximity enables a detailed study of highly ionized gas that can be interpreted in the context of …
View article: Impact of AGN and nuclear star formation on the ISM turbulence of galaxies: Insights from JWST/MIRI spectroscopy
Impact of AGN and nuclear star formation on the ISM turbulence of galaxies: Insights from JWST/MIRI spectroscopy Open
Active galactic nuclei (AGN), star formation (SF), and galaxy interactions can drive turbulence in the gas of the ISM, which in turn plays a role in the SF within galaxies. The impact on molecular gas is of particular importance, as it ser…
View article: Echo mapping of the black hole accretion flow in NGC 7469
Echo mapping of the black hole accretion flow in NGC 7469 Open
Reverberation mapping (RM) can measure black hole accretion disc sizes and radial structure through observable light travel time lags that should increase with wavelength as $\tau \propto \lambda ^{4/3}$ due to the disc’s $T\propto r^{-3/4…
View article: JWST MIRI reveals the diversity of nuclear mid-infrared spectra of nearby type 2 quasars
JWST MIRI reveals the diversity of nuclear mid-infrared spectra of nearby type 2 quasars Open
Type 2 quasars (QSO2s) are active galactic nuclei (AGN) seen through a significant amount of dust and gas that obscures the central supermassive black hole and the broad-line region. Here, we present new mid-infrared spectra of the central…
View article: Census of the most obscured galaxy nuclei over cosmic time to be revealed by PRIMA
Census of the most obscured galaxy nuclei over cosmic time to be revealed by PRIMA Open
View article: On unveiling buried nuclei with JWST: A technique for hunting the most obscured galaxy nuclei from local to high redshift
On unveiling buried nuclei with JWST: A technique for hunting the most obscured galaxy nuclei from local to high redshift Open
We analyze JWST NIRSpec+MIRI/MRS observations of the infrared (IR) polycyclic aromatic hydrocarbon (PAH) features in the central regions (∼0.26″ at 6 μm; ∼50–440 pc depending on the source) of local luminous IR galaxies. In this work, we e…
View article: MICONIC: Dual active galactic nuclei, star formation, and ionised gas outflows in NGC 6240 seen with MIRI/JWST
MICONIC: Dual active galactic nuclei, star formation, and ionised gas outflows in NGC 6240 seen with MIRI/JWST Open
Context. Galaxy mergers are an important and complex phase during the evolution of galaxies. They may trigger nuclear activity and/or strong star forming episodes in galaxy centres that potentially alter the evolution of the system. Aims. …
View article: Polycyclic Aromatic Hydrocarbon Emission in the Central Regions of Three Seyferts and the Implication for Underlying Feedback Mechanisms
Polycyclic Aromatic Hydrocarbon Emission in the Central Regions of Three Seyferts and the Implication for Underlying Feedback Mechanisms Open
We analyze JWST Mid-Infrared Instrument/Medium Resolution Spectrograph integral field unit observations of three Seyferts from the Galactic Activity, Torus, and Outflow Survey (GATOS) and showcase the intriguing polycyclic aromatic hydroca…
View article: H<sub>3</sub><sup>+</sup> absorption and emission in local (U)LIRGs with JWST/NIRSpec: Evidence for high H<sub>2</sub> ionization rates
H<sub>3</sub><sup>+</sup> absorption and emission in local (U)LIRGs with JWST/NIRSpec: Evidence for high H<sub>2</sub> ionization rates Open
We study the 3.4 − 4.4 μm fundamental rovibrational band of H 3 + , a key tracer of the ionization of the molecular interstellar medium (ISM), in a sample of 12 local ( d < 400 Mpc) (ultra)luminous infrared galaxies ((U)LIRGs) observed wit…
View article: H$_3^+$ absorption and emission in local U/LIRGs with JWST/NIRSpec: Evidence for high H$_2$ ionization rates
H$_3^+$ absorption and emission in local U/LIRGs with JWST/NIRSpec: Evidence for high H$_2$ ionization rates Open
We study the 3.4-4.4$μ$m fundamental rovibrational band of H3+, a key tracer of the ionization of the molecular interstellar medium (ISM), in a sample of 12 local (d< 400 Mpc) ultra/luminous infrared galaxies (U/LIRGs) observed with JWST/N…
View article: Dust beyond the torus: revealing the mid-infrared heart of local Seyfert ESO 428-G14 with <i>JWST</i>/MIRI
Dust beyond the torus: revealing the mid-infrared heart of local Seyfert ESO 428-G14 with <i>JWST</i>/MIRI Open
Polar dust has been discovered in a number of local active galactic nuclei (AGN), with radiation-driven torus models predicting a wind to be its main driver. However, little is known about its characteristics, spatial extent, or connection…
View article: Polycyclic aromatic hydrocarbon emission in galaxies as seen with <i>JWST</i>
Polycyclic aromatic hydrocarbon emission in galaxies as seen with <i>JWST</i> Open
We present a systematic study of mid-infrared spectra of galaxies including star-forming galaxies and active galactic nuclei observed with JWST MIRI-MRS and NIRSpec-IFU. We focus on the relative variations of the 3.3, 6.2, 7.7, 11.3, 12.7,…
View article: Polycyclic Aromatic Hydrocarbon Emission in Galaxies as seen with JWST
Polycyclic Aromatic Hydrocarbon Emission in Galaxies as seen with JWST Open
We present a systematic study of mid-infrared spectra of galaxies including star-forming galaxies and Active Galactic Nuclei observed with JWST MIRI-MRS and NIRSpec-IFU. We focus on the relative variations of the 3.3, 6.2, 7.7, 11.3, 12.7 …
View article: The Kinematics of Polycyclic Aromatic Hydrocarbons (PAHs) in Galaxies revealed by Principal Component Analysis (PCA) tomography with JWST/NIRSpec
The Kinematics of Polycyclic Aromatic Hydrocarbons (PAHs) in Galaxies revealed by Principal Component Analysis (PCA) tomography with JWST/NIRSpec Open
Polycyclic Aromatic Hydrocarbons (PAHs) are organic molecules which comprise the smallest particles of dust in the interstellar medium (ISM). Due to their broad/complex emission profiles, obtaining kinematics is a challenge with traditiona…
View article: The kinematics of Polycyclic Aromatic Hydrocarbons (PAHs) in Galaxies revealed by Principal Component Analysis (PCA) tomography with <i>JWST</i>/NIRSpec
The kinematics of Polycyclic Aromatic Hydrocarbons (PAHs) in Galaxies revealed by Principal Component Analysis (PCA) tomography with <i>JWST</i>/NIRSpec Open
Polycyclic Aromatic Hydrocarbons (PAHs) are organic molecules which comprise the smallest particles of dust in the interstellar medium (ISM). Due to their broad/complex emission profiles, obtaining kinematics is a challenge with traditiona…
View article: Dust beyond the torus: Revealing the mid-infrared heart of local Seyfert ESO 428-G14 with JWST/MIRI
Dust beyond the torus: Revealing the mid-infrared heart of local Seyfert ESO 428-G14 with JWST/MIRI Open
Polar dust has been discovered in a number of local Active Galactic Nuclei (AGN), with radiation-driven torus models predicting a wind to be its main driver. However, little is known about its characteristics, spatial extent, or connection…
View article: Peeling back the layers of extinction of dusty galaxies in the era of <i>JWST</i>: modelling joint NIRSpec + MIRI spectra at rest-frame 1.5–28 μm
Peeling back the layers of extinction of dusty galaxies in the era of <i>JWST</i>: modelling joint NIRSpec + MIRI spectra at rest-frame 1.5–28 μm Open
We present an analysis of the combined NIRSpec and MIRI spectra of dusty galaxies between 1.5 and 28 $\mu$m rest-frame by implementing a differential extinction model, where the strength of extinction varies across the spectrum as differen…
View article: Peeling Back the Layers of Extinction of Dusty Galaxies in the Era of JWST: Modelling Joint NIRSpec + MIRI Spectra at rest-frame 1.5-28 $μ$m
Peeling Back the Layers of Extinction of Dusty Galaxies in the Era of JWST: Modelling Joint NIRSpec + MIRI Spectra at rest-frame 1.5-28 $μ$m Open
We present an analysis of the combined NIRSpec and MIRI spectra of dusty galaxies between 1.5 - 28 $μ$m restframe by implementing a differential extinction model, where the strength of extinction varies across the spectrum as different lay…
View article: Structures Of Dust and gAs (SODA): Constraining the innermost dust properties of II Zw96 with JWST observations of H$_2$O and CO
Structures Of Dust and gAs (SODA): Constraining the innermost dust properties of II Zw96 with JWST observations of H$_2$O and CO Open
We analyze JWST NIRSpec$+$MIRI/MRS observations of the infrared (IR) gas-phase molecular bands of the most enshrouded source (D1) within the interacting system and luminous IR galaxy II Zw 096. We report the detection of rovibrational line…
View article: Structures Of Dust and gAs (SODA): Constraining the innermost dust properties of II Zw96 with JWST observations of H<sub>2</sub>O and CO
Structures Of Dust and gAs (SODA): Constraining the innermost dust properties of II Zw96 with JWST observations of H<sub>2</sub>O and CO Open
We analyze JWST NIRSpec+MIRI/MRS observations of the infrared (IR) gas-phase molecular bands of the most enshrouded source (D1) within the interacting system and luminous IR galaxy II Zw 096. We report the detection of rovibrational lines …
View article: JWST detection of extremely excited outflowing CO and H<sub>2</sub>O in VV 114 E SW: A possible rapidly accreting IMBH
JWST detection of extremely excited outflowing CO and H<sub>2</sub>O in VV 114 E SW: A possible rapidly accreting IMBH Open
Mid-infrared (mid-IR) gas-phase molecular bands are powerful diagnostics of the warm interstellar medium. We report the James Webb Space Telescope detection of the CO v = 1 − 0 (4.4 − 5.0 μm) and H 2 O ν 2 = 1 − 0 (5.0 − 7.8 μm) ro-vibrati…
View article: JWST detection of extremely excited outflowing CO and H2O in VV 114 E SW: a possible rapidly accreting IMBH
JWST detection of extremely excited outflowing CO and H2O in VV 114 E SW: a possible rapidly accreting IMBH Open
Mid-infrared (mid-IR) gas-phase molecular bands are powerful diagnostics of the warm interstellar medium. We report the James Webb Space Telescope detection of the CO v=1-0 (4.4-5.0 um) and H2O nu2=1-0 (5.0-7.8um) ro-vibrational bands, bot…
View article: AGN STORM 2. IV. Swift X-Ray and Ultraviolet/Optical Monitoring of Mrk 817
AGN STORM 2. IV. Swift X-Ray and Ultraviolet/Optical Monitoring of Mrk 817 Open
The AGN STORM 2 campaign is a large, multiwavelength reverberation mapping project designed to trace out the structure of Mrk 817 from the inner accretion disk to the broad emission line region and out to the dusty torus. As part of this c…
View article: The Galaxy Activity, Torus, and Outflow Survey (GATOS). III: Revealing the inner icy structure in local AGN
The Galaxy Activity, Torus, and Outflow Survey (GATOS). III: Revealing the inner icy structure in local AGN Open
We use JWST/MIRI MRS spectroscopy of a sample of six local obscured type 1.9/2 active galactic nuclei (AGN) to compare their nuclear mid-IR absorption bands with the level of nuclear obscuration traced by X-rays. This study is the first to…
View article: Testing super-eddington accretion on to a supermassive black hole: reverberation mapping of PG 1119+120
Testing super-eddington accretion on to a supermassive black hole: reverberation mapping of PG 1119+120 Open
We measure the black hole mass and investigate the accretion flow around the local (z = 0.0502) quasar PG 1119+120. Spectroscopic monitoring with Calar Alto provides H β lags and linewidths from which we estimate a black hole mass of log (…
View article: Testing Super-Eddington Accretion onto a Supermassive Black Hole: Reverberation Mapping of PG 1119+120
Testing Super-Eddington Accretion onto a Supermassive Black Hole: Reverberation Mapping of PG 1119+120 Open
We measure the black hole mass and investigate the accretion flow around the local ($z=0.0502$) quasar PG 1119+120. Spectroscopic monitoring with Calar Alto provides H$β$ lags and linewidths from which we estimate a black hole mass of $\lo…