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THE PHYSICS OF THE FAR-INFRARED–RADIO CORRELATION. I. CALORIMETRY, CONSPIRACY, AND IMPLICATIONS
- B. Lacki, T. Thompson, E. Quataert
- Physics
- 23 July 2009
The far-infrared (FIR) and radio luminosities of star-forming galaxies are linearly correlated over a very wide range in star formation rate, from normal spirals like the Milky Way to the most…
Testing the hadronuclear origin of PeV neutrinos observed with IceCube
We consider implications of the IceCube signal for hadronuclear (pp) scenarios of neutrino sources such as galaxy clusters/groups and star-forming galaxies. Since the observed neutrino flux is…
THE PHYSICS OF THE FAR-INFRARED–RADIO CORRELATION. II. SYNCHROTRON EMISSION AS A STAR FORMATION TRACER IN HIGH-REDSHIFT GALAXIES
- B. Lacki, T. Thompson
- Physics
- 2 October 2009
We construct one-zone steady-state models of cosmic ray (CR) injection, cooling, and escape over the entire dynamic range of the FIR–radio correlation (FRC), from normal galaxies to starbursts, over…
ON THE GeV AND TeV DETECTIONS OF THE STARBURST GALAXIES M82 AND NGC 253
- B. Lacki, T. Thompson, E. Quataert, A. Loeb, E. Waxman
- Physics
- 16 March 2010
The GeV and TeV emission from M82 and NGC 253 observed by Fermi, HESS, and VERITAS constrain the physics of cosmic rays (CRs) in these dense starbursts. We argue that the γ-rays are predominantly…
New Class of High-Energy Transients from Crashes of Supernova Ejecta with Massive Circumstellar Material Shells
- K. Murase, T. Thompson, B. Lacki, J. Beacom
- Physics
- 13 December 2010
A new class of core-collapse supernovae (SNe) has been discovered in recent years by optical/infrared surveys; these SNe suggest the presence of one or more extremely dense (~10^5-10^11 cm^-3) shells…
The equipartition magnetic field formula in starburst galaxies: accounting for pionic secondaries and strong energy losses
Equipartition arguments provide an easy way to find a characteristic scale for the magnetic field from radio emission, by assuming the energy densities in cosmic rays and magnetic fields are the…
DIFFUSE HARD X-RAY EMISSION IN STARBURST GALAXIES AS SYNCHROTRON FROM VERY HIGH ENERGY ELECTRONS
- B. Lacki, T. Thompson
- Physics
- 14 October 2010
The origin of the diffuse hard X-ray (2–10 keV) emission from starburst galaxies is a long-standing problem. We suggest that synchrotron emission of 10–100 TeV electrons and positrons (e±) can…
The Fermi bubbles as starburst wind termination shocks
- B. Lacki
- Physics
- 23 April 2013
The enhanced star formation in the inner 100 pc of the Galaxy launches a superwind at ~1600 km s$^{-1}$ for M82-like parameters. The ram pressure of the wind is very low compared to more powerful…
PRIMORDIAL BLACK HOLES AS DARK MATTER: ALMOST ALL OR ALMOST NOTHING
Primordial black holes (PBHs) are expected to accrete particle dark matter around them to form ultracompact minihalos (UCMHs), if the PBHs themselves do not make up most of the dark matter. We show…
Interpreting the low-frequency radio spectra of starburst galaxies: a pudding of Strömgren spheres
- B. Lacki
- Physics
- 29 June 2012
The low frequency radio emission of starburst galaxies is informative, but it can be absorbed in several ways. Most importantly, starburst galaxies are home to many H II regions, whose free-free…
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