94 citations · 436 across the 12 of their papers we have counts for
12 papers
VV 655 and NGC 4418: Implications of an interaction for the evolution of a LIRG
Erin Boettcher, John S. Gallagher, Youichi Ohyama +6
VV 655, a dwarf irregular galaxy with HI tidal debris, is a companion to the lenticular luminous infrared galaxy (LIRG) NGC 4418. NGC 4418 stands out among nearby LIRGs due to its…
Breaking the Radio - Gamma-Ray Connection in Arp 220
Tova M. Yoast-Hull, Norman Murray
Recent analyses of the gamma-ray spectrum from the ultra-luminous infrared galaxy Arp 220 have revealed a discrepancy in the cosmic ray energy injection rates derived from the gamm…
Gamma-Ray Emission from Arp 220: Indications of an Active Galactic Nucleus
Tova M. Yoast-Hull, John S. Gallagher, Susanne Aalto +1
Extragalactic cosmic ray populations are important diagnostic tools for tracking the distribution of energy in nuclei and for distinguishing between activity powered by star format…
Gamma-Ray Puzzles in Cygnus X: Implications for High-Energy Neutrinos
Tova M. Yoast-Hull, John S. Gallagher, Francis Halzen +2
The Cygnus X region contains giant molecular cloud complexes and populous associates of massive young stars. The discovery of spatially extended, hard gamma-ray emission in Cygnus…
Subarcsecond international LOFAR radio images of Arp 220 at 150 MHz: A kpc-scale star forming disk surrounding nuclei with shocked outflows
E. Varenius, J. E. Conway, I. Martí-Vidal +16
We analyse new observations with the International Low Frequency Array (LOFAR) telescope, and archival data from the Multi-Element Radio Linked Interferometer Network (MERLIN) and…
Equipartition and Cosmic Ray Energy Densities in Central Molecular Zones of Starbursts
Tova M. Yoast-Hull, John S. Gallagher, Ellen G. Zweibel
The energy densities in magnetic fields and cosmic rays (CRs) in galaxies are often assumed to be in equipartition, allowing for an indirect estimate of the magnetic field strength…
Cosmic Rays, Gamma-Rays, and Neutrinos in the Starburst Nuclei of Arp 220
Tova M. Yoast-Hull, John S. Gallagher, Ellen G. Zweibel
The cores of Arp 220, the closest ultra-luminous infrared starburst galaxy, provide an opportunity to study interactions of cosmic rays under extreme conditions. In this paper, we…
The Cosmic Ray Population of the Galactic Central Molecular Zone
Tova M. Yoast-Hull, J. S. Gallagher, Ellen G. Zweibel
The conditions in the Galactic Center are often compared with those in starburst systems, which contain higher supernova rates, stronger magnetic fields, more intense radiation fie…
Lessons from Comparisons between the Nuclear Region of the Milky Way & Those in Nearby Spirals
J. S. Gallagher, Tova M. Yoast-Hull, Ellen G. Zweibel
The Milky Way appears is a typical barred spiral, and comparisons can be made between its nuclear region and those of structurally similar nearby spirals. Maffei 2, M83, IC 342 and…
Active Galactic Nuclei, Neutrinos, and Interacting Cosmic Rays in NGC 253 & NGC 1068
Tova M. Yoast-Hull, J. S. Gallagher, Ellen G. Zweibel +1
The galaxies M82, NGC 253, NGC 1068, and NGC 4945 have been detected in gamma-rays by Fermi. Previously, we developed and tested a model for cosmic ray interactions in the starburs…
Cosmic Ray Sampling of a Clumpy Interstellar Medium
Erin Boettcher, Ellen G. Zweibel, Tova M. Yoast-Hull +1
How cosmic rays sample the multi-phase interstellar medium (ISM) in starburst galaxies has important implications for many science goals, including evaluating the cosmic ray calori…
Winds, Clumps, and Interacting Cosmic Rays in M82
Tova M. Yoast-Hull, John E. Everett, J. S. Gallagher +1
We construct a family of models for the evolution of energetic particles in the starburst galaxy M82 and compare them to observations to test the calorimeter assumption that all co…