Thomas Bøhn
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View article: Scientists’ warning: we must change paradigm for a revolution in toxicology and world food supply
Scientists’ warning: we must change paradigm for a revolution in toxicology and world food supply Open
We propose a new paradigm, as toxicology currently lacks the proper perspective. From the 1950s to the 1970s, at least one-third of all toxicological testing in the United States, including for chemicals and drugs, was misleading scientist…
View article: Effects of salmon farming on Atlantic cod: insights from liver fatty acid composition in relation to biological and genetic variables
Effects of salmon farming on Atlantic cod: insights from liver fatty acid composition in relation to biological and genetic variables Open
The present study investigated the impact of salmon aquaculture on the fatty acid composition in the liver of Atlantic cod Gadus morhua L. in northern Norway, comparing Northeast Arctic cod (NEAC) and Norwegian coastal cod (NCC) ecotypes. …
View article: A High Resolution Search for Dual AGNs in Mergers: Pushing the Frontier with Keck AO
A High Resolution Search for Dual AGNs in Mergers: Pushing the Frontier with Keck AO Open
Accreting supermassive black holes (SMBHs) in galaxy mergers with separations $0.5$) indicative of accretion activity and significant sub-arcsecond offsets between their optical and infrared coordinates as measured by SDSS and WISE. We con…
View article: Connecting the dots: evidence of interactions between wild Atlantic cod Gadus morhua, the benthic environment and salmon farm discharges
Connecting the dots: evidence of interactions between wild Atlantic cod Gadus morhua, the benthic environment and salmon farm discharges Open
Rapid expansion in coastal salmon farming has coincided with declines in coastal Atlantic cod Gadus morhua populations in Norway, raising suspicions over a causal relationship. One established effects pathway concerns the discharge of exog…
View article: A Spectroscopically Calibrated Prescription for Extracting PAH Flux from JWST MIRI Imaging
A Spectroscopically Calibrated Prescription for Extracting PAH Flux from JWST MIRI Imaging Open
We introduce a prescription for estimating the flux of the 7.7 micron and 11.3 micron\ polycyclic aromatic hydrocarbon (PAH) features from broadband JWST/MIRI images. Probing PAH flux with MIRI imaging data has advantages in field of view,…
Size matters: Perspective and angle‐correction improves accuracy in noninvasive image‐based body size measurements Open
River management should secure conservation of biodiversity and sustainable use of aquatic resources. Conservation of fish populations requires time‐series data on the number of fish present and the size‐structure. The number of fish and s…
In situ infestation of sea trout <i>Salmo trutta</i> with salmon louse <i>Lepeophtheirus salmonis</i> reveals parasite‐induced behavioral modifications Open
In areas with high densities of salmon farming, spillover of the ectoparasitic salmon louse Lepeophtheirus salmonis poses a major threat to wild anadromous salmonids. By combining experimentally salmon louse infestation (mean ± standard de…
View article: Comparative Study of Fatty Acid Composition of Muscles of Atlantic Cod (Gadus morhua Linnaeus, 1758) with Natural Diet and Feeding near Salmon Farms
Comparative Study of Fatty Acid Composition of Muscles of Atlantic Cod (Gadus morhua Linnaeus, 1758) with Natural Diet and Feeding near Salmon Farms Open
Coastal aquaculture and local fisheries interact in shared marine environments, influencing each other synergistically and/or antagonistically. Salmon farming, notably with open-net sea cages along the Norwegian coast, attracts wild fish d…
View article: Local Analogs of Primordial Galaxies: In Search of Intermediate Mass Black Holes with JWST NIRSpec
Local Analogs of Primordial Galaxies: In Search of Intermediate Mass Black Holes with JWST NIRSpec Open
Local low metallicity galaxies with signatures of possible accretion activity are ideal laboratories in which to search for the lowest mass black holes and study their impact on the host galaxy. Here we present the first JWST NIRSpec IFS o…
GOALS-JWST: The Warm Molecular Outflows of the Merging Starburst Galaxy NGC 3256 Open
We present James Webb Space Telescope (JWST) Integral Field Spectrograph observations of NGC 3256, a local infrared-luminous late-stage merging system with two nuclei roughly 1$\;\rm{kpc}$ apart, both of which have evidence of cold molecul…
View article: Ecological interactions between farmed Atlantic salmon and wild Atlantic cod populations in Norway: A review of risk sources and knowledge gaps
Ecological interactions between farmed Atlantic salmon and wild Atlantic cod populations in Norway: A review of risk sources and knowledge gaps Open
Aquaculture provides an important and expanding source of protein rich and healthy food to the world. However, to minimize environmental harm from aquaculture, interactions with wild fish communities need to be thoroughly assessed. Here, w…
Fast Outflows and Luminous He II Emission in Dwarf Galaxies with AGN Open
While stellar processes are believed to be the main source of feedback in dwarf galaxies, the accumulating discoveries of AGN in dwarf galaxies over recent years arouse the interest to also consider AGN feedback in them. Fast, AGN-driven o…
GOALS-JWST: Gas Dynamics and Excitation in NGC7469 revealed by NIRSpec Open
We present new JWST-NIRSpec IFS data for the luminous infrared galaxy NGC7469: a nearby (70.6Mpc) active galaxy with a Sy 1.5 nucleus that drives a highly ionized gas outflow and a prominent nuclear star-forming ring. Using the superb sens…
GOALS-JWST: Small neutral grains and enhanced 3.3 micron PAH emission in the Seyfert galaxy NGC 7469 Open
We present James Webb Space Telescope (JWST) Near Infrared Spectrograph (NIRSpec) integral-field spectroscopy of the nearby luminous infrared galaxy, NGC 7469. We take advantage of the high spatial/spectral resolution and wavelength covera…
View article: Movement diversity and partial sympatry of coastal and Northeast Arctic cod ecotypes at high latitudes
Movement diversity and partial sympatry of coastal and Northeast Arctic cod ecotypes at high latitudes Open
Movement diversity within species represent an important but often neglected, component of biodiversity that affects ecological and genetic interactions, as well as the productivity of exploited systems. By combining individual tracking da…
View article: What Does the Virial Coefficient of the \Hb Broad-Line Region Depend On?
What Does the Virial Coefficient of the \Hb Broad-Line Region Depend On? Open
We combine our dynamical modeling black hole mass measurements from the Lick AGN Monitoring Project 2016 sample with measured cross-correlation time lags and line widths to recover individual scale factors, f, used in traditional reverbera…
View article: A Comparison of Outflow Properties in AGN Dwarfs vs. Star Forming Dwarfs
A Comparison of Outflow Properties in AGN Dwarfs vs. Star Forming Dwarfs Open
Feedback likely plays a crucial role in resolving discrepancies between observed and theoretical predictions of dwarf galaxy properties. Stellar feedback was once believed to be sufficient to explain these discrepancies, but it has thus fa…
Behaviour and habitat use of first-time migrant Arctic charr: novel insights from a subarctic marine area Open
Anadromous Arctic charr Salvelinus alpinus is a cold-adapted salmonid that is vulnerable to climate warming and anthropogenic activities including salmon farming, hydropower regulation, and pollution, which poses a multiple-stressor scenar…
View article: The Messy Nature of Fiber Spectra: Star-Quasar Pairs Masquerading as Dual Type 1 AGNs
The Messy Nature of Fiber Spectra: Star-Quasar Pairs Masquerading as Dual Type 1 AGNs Open
Theoretical studies predict that the most significant growth of supermassive black holes occurs in late-stage mergers, coinciding with the manifestation of dual active galactic nuclei (AGNs), and both major and minor mergers are expected t…
View article: NuSTAR Observes Two Bulgeless Galaxies: No Hard X-ray AGN Detected in NGC 4178 or J0851+3926
NuSTAR Observes Two Bulgeless Galaxies: No Hard X-ray AGN Detected in NGC 4178 or J0851+3926 Open
The discovery over the last several decades of moderate luminosity AGNs in disk-dominated galaxies - which show no "classical" bulges - suggests that secular mechanisms represent an important growth pathway for supermassive black holes in …
GOALS-JWST: Revealing the Buried Star Clusters in the Luminous Infrared Galaxy VV 114 Open
We present the results of a {\it James Webb Space Telescope} NIRCam investigation into the young massive star cluster (YMC) population in the luminous infrared galaxy VV 114. We identify 374 compact YMC candidates with a $S/N \geq 3$, 5, a…
GOALS-JWST: Tracing AGN Feedback on the Star-Forming ISM in NGC 7469 Open
We present James Webb Space Telescope (JWST) Mid-InfraRed Instrument (MIRI) integral-field spectroscopy of the nearby merging, luminous infrared galaxy, NGC 7469. This galaxy hosts a Seyfert type-1.5 nucleus, a highly ionized outflow, and …
GOALS-JWST: NIRCam and MIRI Imaging of the Circumnuclear Starburst Ring in NGC 7469 Open
We present James Webb Space Telescope (JWST) imaging of NGC 7469 with the Near-Infrared Camera (NIRCam) and the Mid-InfraRed Instrument (MIRI). NGC 7469 is a nearby, $z=0.01627$, luminous infrared galaxy (LIRG) that hosts both a Seyfert Ty…
GOALS-JWST: Resolving the Circumnuclear Gas Dynamics in NGC 7469 in the Mid-Infrared Open
The nearby, luminous infrared galaxy (LIRG) NGC 7469 hosts a Seyfert nucleus with a circumnuclear star-forming ring and is thus the ideal local laboratory for investigating the starburst--AGN connection in detail. We present integral-field…
View article: GOALS-JWST: Hidden Star Formation and Extended PAH Emission in the Luminous Infrared Galaxy VV 114
GOALS-JWST: Hidden Star Formation and Extended PAH Emission in the Luminous Infrared Galaxy VV 114 Open
James Webb Space Telescope (JWST) Mid-InfraRed Instrument (MIRI) images of the luminous infrared (IR) galaxy VV 114 are presented. This redshift ~ 0.020 merger has a western component (VV 114W) rich in optical star clusters and an eastern …
GOALS-JWST: Unveiling Dusty Compact Sources in the Merging Galaxy IIZw096 Open
We have used the Mid-InfraRed Instrument (MIRI) on the James Webb Space Telescope (JWST) to obtain the first spatially resolved, mid-infrared (mid-IR) images of IIZw096, a merging luminous infrared galaxy (LIRG) at $z = 0.036$. Previous ob…
Behavioural responses of wild anadromous Arctic char experimentally infested <i>in situ</i> with salmon lice Open
Salmon lice can impact the marine behaviour, growth, and survival of salmonids, but little is known about their effects on Arctic char. We present behavioural responses from the first dose-response experiment with wild anadromous Arctic ch…
A Near-infrared Look at AGN Feedback in Bulgeless Galaxies Open
While it is generally believed that supermassive black holes (SMBHs) lie in most galaxies with bulges, few SMBHs have been confirmed in bulgeless galaxies. Identifying such a population could provide important insights to the BH seed popul…
Micro- and macro-habitat selection of Atlantic salmon,<i>Salmo salar</i>, post-smolts in relation to marine environmental cues Open
Atlantic salmon is an economically and culturally important species. The species encounters several natural and man-made threats during its migration between fresh water and the ocean, which in combination may explain its ongoing decline. …