Wyithe, Stuart, Hopkins, Andrew M., Kistler, Matthew D., Yuksel, Hasan, Beacom, John F.
The fraction of ionizing photons that escape their host galaxies and so are able to ionize hydrogen in the inter-galactic medium (IGM) is a critical parameter in analyses of the reionization era and...
The Star Formation Rate in the Reionization Era as Indicated by Gamma-ray Bursts (2009)
Kistler, Matthew D., Yuksel, Hasan, Beacom, John F., Hopkins, Andrew M., Wyithe, J. Stuart B.
High-redshift gamma-ray bursts (GRBs) offer an extraordinary opportunity to study aspects of the early Universe, including the cosmic star formation rate (SFR). Motivated by the two recent highest-z...
The Diffuse Supernova Neutrino Background is detectable in Super-Kamiokande (2008)
Horiuchi, Shunsaku, Beacom, John F., Dwek, Eli
The Diffuse Supernova Neutrino Background (DSNB) provides an immediate opportunity to study the emission of MeV thermal neutrinos from core-collapse supernovae. The DSNB is a powerful probe of...
Core-Collapse Astrophysics with a Five-Megaton Neutrino Detector (2008)
Kistler, Matthew D., Yuksel, Hasan, Ando, Shin'ichiro, Beacom, John F., Suzuki, Yoichiro
The legacy of solar neutrinos suggests that large neutrino detectors should be sited underground. However, to instead go underwater bypasses the need to move mountains, allowing much larger contained...
A New Class of Luminous Transients and A First Census of Their Massive Stellar Progenitors (2008)
Thompson, Todd A., Prieto, Jose L., Stanek, K. Z., Kistler, Matthew D., Beacom, John F., Kochanek, Christopher S.
The progenitors of SN 2008S and the luminous 2008 transient in NGC 300 were dust-enshrouded, with extremely red mid-infrared (MIR) colors. In addition, the MIR luminosities of the M85 transient and...
Revealing the High-Redshift Star Formation Rate with Gamma-Ray Bursts (2008)
Yuksel, Hasan, Kistler, Matthew D., Beacom, John F., Hopkins, Andrew M.
While the high-z frontier of star formation rate (SFR) studies has advanced rapidly, direct measurements beyond z ~ 4 remain difficult, as shown by significant disagreements among different results....
Ando, Shin'ichiro, Beacom, John F., Profumo, Stefano, Rainwater, David
As suggested by some extensions of the standard model of particle physics, dark matter may be a super-weakly-interacting lightest stable particle, while the next-to-lightest particle (NLP) is charged...
Conservative Constraints on Dark Matter Annihilation into Gamma Rays (2008)
Mack, Gregory D., Jacques, Thomas D., Beacom, John F., Bell, Nicole F., Yuksel, Hasan
Using gamma-ray data from observations of the Milky Way, Andromeda (M31), and the cosmic background, we calculate conservative upper limits on the dark matter self-annihilation cross section to...
Discovery of the dust-enshrouded progenitor of SN 2008S with Spitzer (2008)
Prieto, José L., Kistler, Matthew D., Thompson, Todd A., Yüksel, Hasan, Kochanek, Christopher S., Stanek, Krzysztof Z., ...
We report the discovery of the progenitor of the recent Type IIn SN 2008S in the nearby galaxy NGC 6946. Surprisingly, it was not found in deep, preexplosion optical images of its host galaxy taken...
Neutrino constraints on the dark matter total annihilation cross section (2007)
Yüksel, Hasan, Horiuchi, Shunsaku, Beacom, John F., Ando, Shin'ichiro
In the indirect detection of dark matter through its annihilation products, the signals depend on the square of the dark matter density, making precise knowledge of the distribution of dark matter in...
Upper Bound on the Dark Matter Total Annihilation Cross Section (2007)
Beacom, John F., Bell, Nicole F., Mack, Gregory D.
We consider dark matter annihilation into standard model particles and show that the least detectable final states, namely, neutrinos, define an upper bound on the total cross section. Calculating...
Ando, Shin'ichiro, Beacom, John F., Profumo, Stefano, Rainwater, David
As suggested by some extensions of the Standard Model of particle physics, dark matter may be a super-weakly interacting lightest stable particle, while the next-to-lightest particle (NLP) is charged...
An Unexpectedly Swift Rise in the Gamma-ray Burst Rate (2007)
Kistler, Matthew D., Yuksel, Hasan, Beacom, John F., Stanek, Krzysztof Z.
The association of long gamma-ray bursts with supernovae naturally suggests that the cosmic GRB rate should trace the star formation history. Finding otherwise would provide important clues...
Prieto, Jose L., Stanek, Krzysztof Z., Beacom, John F.
We investigate how the different types of supernovae are relatively affected by the metallicity of their host galaxy. We match the SAI Supernova Catalog to the SDSS-DR4 catalog of star-forming...
Neutrino Constraints on the Dark Matter Total Annihilation Cross Section (2007)
Yuksel, Hasan, Horiuchi, Shunsaku, Beacom, John F., Ando, Shin'ichiro
In the indirect detection of dark matter through its annihilation products, the signals depend on the square of the dark matter density, making precise knowledge of the distribution of dark matter in...
Strong Upper Limits on Sterile Neutrino Warm Dark Matter (2007)
Yuksel, Hasan, Beacom, John F., Watson, Casey R.
Sterile neutrinos are attractive dark matter candidates. Their parameter space of mass and mixing angle has not yet been fully tested despite intensive efforts that exploit their gravitational...
TASI Lectures on Astrophysical Aspects of Neutrinos (2007)
Neutrino astronomy is on the verge of discovering new sources, and this will lead to important advances in astrophysics, cosmology, particle physics, and nuclear physics. This paper is meant for...
TeV gamma-rays from photo-disintegration/de-excitation of nuclei in Westerlund 2 (2007)
Anchordoqui, Luis A., Beacom, John F., Butt, Yousaf M., Goldberg, Haim, Palomares-Ruiz, Sergio, Weiler, Thomas J., ...
TeV gamma-rays can result from the photo-de-excitation of PeV cosmic ray nuclei after their parents have undergone photo-disintegration in an environment of ultraviolet photons. This process is...
Mack, Gregory D., Beacom, John F., Bertone, Gianfranco
We point out a new and largely model-independent constraint on the dark matter scattering cross section with nucleons, applying when this quantity is larger than for typical weakly interacting dark...
Neutrino Spectrum from SN 1987A and from Cosmic Supernovae (2007)
Yuksel, Hasan, Beacom, John F.
The detection of neutrinos from SN 1987A by the Kamiokande-II and Irvine-Michigan-Brookhaven detectors provided the first glimpse of core collapse in a supernova, complementing the optical...
Dissecting the Cygnus Region with TeV Gamma Rays and Neutrinos (2007)
Beacom, John F., Kistler, Matthew D.
Recent Milagro observations of the Cygnus region have revealed both diffuse TeV gamma-ray emission and a bright and extended TeV source, MGRO J2019+37, which seems to lack an obvious counterpart at...
TeV gamma-rays from photo-disintegration/de-excitation of cosmic-ray nuclei (2006)
Anchordoqui, Luis A., Beacom, John F., Goldberg, Haim, Palomares-Ruiz, Sergio, Weiler, Thomas J.
It is commonly assumed that high-energy gamma-rays are made via either purely electromagnetic processes or the hadronic process of pion production, followed by decay. We investigate astrophysical...
TeV gamma-rays and neutrinos from photo-disintegration of nuclei in Cygnus OB2 (2006)
Anchordoqui, Luis A., Beacom, John F., Goldberg, Haim, Palomares-Ruiz, Sergio, Weiler, Thomas J.
TeV gamma-rays may provide significant information about high energy astrophysical accelerators. Such gamma-rays can result from the photo-de-excitation of PeV nuclei after their parents have...
Cosmic Neutrino Bound on the Dark Matter Annihilation Rate in the Late Universe (2006)
How large can the dark matter self-annihilation rate in the late universe be? This rate depends on (rho_DM/m_chi)^2 , where rho_DM/m_chi is the number density of dark matter, and the annihilation...
Upper Bound on the Dark Matter Total Annihilation Cross Section (2006)
Beacom, John F., Bell, Nicole F., Mack, Gregory D.
We consider dark matter annihilation into Standard Model particles and show that the least detectable final states, namely neutrinos, define an upper bound on the total cross section. Calculating the...
Guaranteed and Prospective Galactic TeV Neutrino Sources (2006)
Kistler, Matthew D., Beacom, John F.
Recent observations, particularly from the HESS Collaboration, have revealed rich Galactic populations of TeV gamma-ray sources, including a collection unseen in other wavelengths. Many of these...
Direct X-ray Constraints on Sterile Neutrino Warm Dark Matter (2006)
Watson, Casey R., Beacom, John F., Yuksel, Hasan, Walker, Terry P.
Warm dark matter (WDM) might more easily account for small scale clustering measurements than the heavier particles typically invoked in Lambda cold dark matter (LCDM) cosmologies. In this paper, we...
Prodanovic, Tijana, Fields, Brian D., Beacom, John F.
Pion decay gamma rays have long been recognized as a unique signature of hadronic cosmic rays and their interactions with the interstellar medium. We present a model-independent way of constraining...
The Cosmic Stellar Birth and Death Rates (2006)
The cosmic stellar birth rate can be measured by standard astronomical techniques. It can also be probed via the cosmic stellar death rate, though until recently, this was much less precise. However,...
On the normalisation of the cosmic star formation history (2006)
Hopkins, Andrew M., Beacom, John F.
Strong constraints on the cosmic star formation history (SFH) have recently been established using ultraviolet and far-infrared measurements, refining the results of numerous measurements over the...
Stringent Constraint on Galactic Positron Production (2005)
Beacom, John F., Yuksel, Hasan
The intense 0.511 MeV gamma-ray line emission from the Galactic Center observed by INTEGRAL requires a large annihilation rate of nonrelativistic positrons. If these positrons are injected at even...
Beacom, John F., Strigari, Louis E.
Supernovae are rare nearby, but they are not rare in the Universe, and all past core-collapse supernovae contributed to the Diffuse Supernova Neutrino Background (DSNB), for which the near-term...
Gamma-Ray Constraint on Galactic Positron Production by MeV Dark Matter (2005)
Beacom, John F., Bell, Nicole F., Bertone, Gianfranco
The Galactic positrons, as observed by their annihilation gamma-ray line at 0.511 MeV, are difficult to account for with astrophysical sources. It has been proposed that they are produced instead by...
Galbiati, Cristiano, Beacom, John. F.
While cosmic ray muons themselves are relatively easy to veto in underground detectors, their interactions with nuclei create more insidious backgrounds via: (i) the decays of long-lived isotopes...
Detection of Neutrinos from Supernovae in Nearby Galaxies (2005)
Ando, Shin'ichiro, Beacom, John F., Yuksel, Hasan
While existing detectors would see a burst of many neutrinos from a Milky Way supernova, the supernova rate is only a few per century. As an alternative, we propose the detection of ~ 1 neutrino per...
Revealing the Supernova--Gamma-Ray Burst Connection with TeV Neutrinos (2005)
Ando, Shin'ichiro, Beacom, John F.
Gamma-ray bursts (GRBs) are rare but powerful explosions displaying highly relativistic jets. It has been suggested that a significant fraction of the much more frequent core-collapse supernovae are...
Strigari, Louis E., Beacom, John F., Walker, Terry P., Zhang, Pengjie
We constrain the Cosmic Star Formation Rate (CSFR) by requiring that massive stars produce the observed UV, optical, and IR light while at the same time not overproduce the Diffuse Supernova Neutrino...
APS Neutrino Study: Report of the Neutrino Astrophysics and Cosmology Working Group (2004)
Barwick, Steve W., Beacom, John F., Cianciolo, Vince, Dodelson, Scott, Feng, Jonathan L., Fuller, George M., ...
In 2002, Ray Davis and Masatoshi Koshiba were awarded the Nobel Prize in Physics ``for pioneering contributions to astrophysics, in particular for the detection of cosmic neutrinos.'' However, while...
Gamma-Ray Constraint on Galactic Positron Production by MeV Dark Matter (2004)
Beacom, John F., Bell, Nicole F., Bertone, Gianfranco
The Galactic positrons, as observed by their annihilation gamma-ray line at 0.511 MeV, are difficult to account for with astrophysical sources. It has been proposed that they are produced instead by...
Shower Power: Isolating the Prompt Atmospheric Neutrino Flux Using Electron Neutrinos (2004)
Beacom, John F., Candia, Julián
At high energies, the very steep decrease of the conventional atmospheric component of the neutrino spectrum should allow the emergence of even small and isotropic components of the total spectrum,...
Beacom, John F., Bell, Nicole F., Dodelson, Scott
We consider the consequences for the relic neutrino abundance if extra neutrino interactions are allowed, e.g., the coupling of neutrinos to a light (compared to $m_\nu$) boson. For a wide range of...
Angular Correlations of the MeV Cosmic Gamma Ray Background (2004)
Zhang, Pengjie, Beacom, John F.
The measured cosmic gamma ray background (CGB) spectrum at MeV energies is in reasonable agreement with the predicted contribution from type Ia supernovae (SNIa). But the characteristic features in...
GADZOOKS! Antineutrino Spectroscopy with Large Water Cerenkov Detectors (2003)
Beacom, John F., Vagins, Mark R.
We propose modifying large water \v{C}erenkov detectors by the addition of 0.2% gadolinium trichloride, which is highly soluble, newly inexpensive, and transparent in solution. Since Gd has an...
Sensitivity to $\theta_{13}$ and $\delta$ in the Decaying Astrophysical Neutrino Scenario (2003)
Beacom, John F., Bell, Nicole F., Hooper, Dan, Pakvasa, Sandip, Weiler, Thomas J.
We have previously shown that the decay of high-energy neutrinos from distant astrophysical sources would be revealed by flavor ratios that deviate strongly from the...
Pseudo-Dirac Neutrinos, a Challenge for Neutrino Telescopes (2003)
Beacom, John F., Bell, Nicole F., Hooper, Dan, Learned, John G., Pakvasa, Sandip, Weiler, Thomas J.
Neutrinos may be pseudo-Dirac states, such that each generation is actually composed of two maximally-mixed Majorana neutrinos separated by a tiny mass difference. The usual active neutrino...
Measuring Flavor Ratios of High-Energy Astrophysical Neutrinos (2003)
Beacom, John F., Bell, Nicole F., Hooper, Dan, Pakvasa, Sandip, Weiler, Thomas J.
We discuss the prospects for next generation neutrino telescopes, such as IceCube, to measure the flavor ratios of high-energy astrophysical neutrinos. The expected flavor ratios at the sources are...
Beacom, John F., Palomares-Ruiz, Sergio
Recent results show that atmospheric $\nu_\mu$ oscillate with $\delta m^2 \simeq 3 \times 10^{-3}$ eV$^2$ and $\sin^2{2\theta_{atm}} \simeq 1$, and that conversion into $\nu_e$ is strongly...
Decay of High-Energy Astrophysical Neutrinos (2002)
Beacom, John F., Bell, Nicole F., Hooper, Dan, Pakvasa, Sandip, Weiler, Thomas J.
Existing limits on the non-radiative decay of one neutrino to another plus a massless particle (e.g., a singlet Majoron) are very weak. The best limits on the lifetime to mass ratio come from solar...
Supernovae and Neutrinos (2002)
A long-standing problem in supernova physics is how to measure the total energy and temperature of $\nu_\mu$, $\nu_\tau$, $\bar{\nu}_\mu$, and $\bar{\nu}_\tau$. While of the highest importance, this...
Detection of supernova neutrinos by neutrino-proton elastic scattering (2002)
Beacom, John F., Farr, Will M., Vogel, Petr
We propose that neutrino-proton elastic scattering, ν+p→ν+p, can be used for the detection of supernova neutrinos in scintillator detectors. Though the proton recoil kinetic energy spectrum is...
Detection of Supernova Neutrinos by Neutrino-Proton Elastic Scattering (2002)
Beacom, John F., Farr, Will M., Vogel, Petr
We propose that neutrino-proton elastic scattering, $\nu + p \to \nu + p$, can be used for the detection of supernova neutrinos in scintillator detectors. Though the proton recoil kinetic energy...
Potential for Supernova Neutrino Detection in MiniBooNE (2002)
Sharp, Matthew K., Beacom, John F., Formaggio, Joseph A.
The MiniBooNE detector at Fermilab is designed to search for $\nu_\mu \to \nu_e$ oscillation appearance at $E_\nu \sim 1 {\rm GeV}$ and to make a decisive test of the LSND signal. The main detector...
Do solar neutrinos decay? (2002)
Beacom, John F., Bell, Nicole F.
Despite the fact that the solar neutrino flux is now well-understood in the context of matter-affected neutrino mixing, we find that it is not yet possible to set a strong and model-independent bound...
Abazajian, Kevork N., Beacom, John F., Bell, Nicole F.
We assess a mechanism which can transform neutrino-antineutrino asymmetries between flavors in the early universe, and confirm that such transformation is unavoidable in the near bi-maximal framework...
Enhanced signal of astrophysical tau neutrinos propagating through Earth (2001)
Beacom, John F., Crotty, Patrick, Kolb, Edward W.
Earth absorbs $\nue$ and $\numu$ of energies above about 100 TeV. As is well-known, although $\nutau$ will also disappear through charged-current interactions, the $\nutau$ flux will be regenerated...
On the Normalization of the Neutrino-Deuteron Cross Section (2001)
Beacom, John F., Parke, Stephen J.
As is well-known, comparison of the solar neutrino fluxes measured in SuperKamiokande (SK) by $\nu + e^- \to \nu + e^-$ and in the Sudbury Neutrino Observatory (SNO) by $\nu_e + d \to e^- + p + p$...
A survey of administrative problems of flexible scheduling. (1969)
Title on spine: Administrative problems of flexible scheduling.