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Measuring the Accreting Stellar and Intermediate Mass Black Hole Populations in the Galaxy and Local Group
Jonathan Grindlay, Didier Barret, Tomaso Belloni +23
The population of stellar black holes (SBHs) in the Galaxy and galaxies generally is poorly known in both number and distribution. SBHs are the fossil record of the massive stars i…
Dynamics and Magnetization in Galaxy Cluster Cores Traced by X-ray Cold Fronts
Uri Keshet, Maxim Markevitch, Yuval Birnboim +1
Cold fronts (CFs) - density and temperature plasma discontinuities - are ubiquitous in cool cores of galaxy clusters, where they appear as X-ray brightness edges in the intracluste…
Constraining Parity Violation in Gravity with Measurements of Neutron-Star Moments of Inertia
Nicolas Yunes, Dimitrios Psaltis, Feryal Ozel +1
Neutron stars are sensitive laboratories for testing general relativity, especially when considering deviations where velocities are relativistic and gravitational fields are stron…
Evidence for a Black Hole Remnant in the Type IIL Supernova 1979C
D. J. Patnaude, A. Loeb, C. Jones
We present an analysis of archival X-ray observations of the Type IIL supernova SN 1979C. We find that its X-ray luminosity is remarkably constant at (6.5+/-0.1) x 10^38 erg/s over…
Identifying Supermassive Black Hole Binaries with Broad Emission Line Diagnosis
Yue Shen, Abraham Loeb
Double-peaked broad emission lines in Active Galactic Nuclei (AGNs) may indicate the existence of a bound supermassive black hole (SMBH) binary where two distinct broad line region…
Detecting Changing Polarization Structures in Sagittarius A* with High Frequency VLBI
Vincent L. Fish, Sheperd S. Doeleman, Avery E. Broderick +2
Sagittarius A* is the source of near infrared, X-ray, radio, and (sub)millimeter emission associated with the supermassive black hole at the Galactic Center. In the submillimeter r…
Will the Large Synoptic Survey Telescope detect extra-solar planetesimals entering the solar system?
Amaya Moro-Martin, Edwin L. Turner, Abraham Loeb
Planetesimal formation is a common by-product of the star formation process. Taking the dynamical history of the Solar system as a guideline -- in which the planetesimal belts were…
An Electromagnetic Signature of Galactic Black Hole Binaries That Enter Their Gravitational-Wave Induced Inspiral
Abraham Loeb
Mergers of gas-rich galaxies lead to black hole binaries that coalesce as a result of dynamical friction on the ambient gas. Once the binary tightens to <10^3 Schwarzschild radii,…
Constraining reionization using 21 cm observations in combination with CMB and Lyman-alpha forest data
Jonathan R. Pritchard, Abraham Loeb, J. Stuart B. Wyithe
In this paper, we explore the constraints on the reionization history that are provided by current observations of the Lyman-alpha forest and the CMB. Rather than using a particula…
Signatures of Relativistic Helical Motion in the Rotation Measures of AGN Jets
Avery E Broderick, Abraham Loeb
Polarization has proved an invaluable tool for probing magnetic fields in relativistic jets. Maps of the intrinsic polarization vectors have provided the best evidence to date for…
Probing the Epoch of Reionization with the Lyman Alpha Forest at z~4-5
Renyue Cen, Patrick McDonald, Hy Trac +1
The inhomogeneous cosmological reionization process leaves tangible imprints in the intergalactic medium down to z=4-5. The Lyman-alpha forest flux power spectrum provides a potent…
Concentrating the Dark Matter in Galaxy Clusters through Tidal Stripping of Baryonically-Compressed Galactic Halos
Rennan Barkana, Abraham Loeb
Gravitational lensing observations of massive X-ray clusters imply a steep characteristic density profile marked by a central concentration of dark matter. The observed mass fracti…
Imaging an Event Horizon: submm-VLBI of a Super Massive Black Hole
Sheperd Doeleman, Eric Agol, Don Backer +20
A long standing goal in astrophysics is to directly observe the immediate environment of a black hole with angular resolution comparable to the event horizon. Realizing this goal w…
Galaxy Statistics in Pencil-beam Surveys at High Redshifts
Joseph A. Muñoz, Hy Trac, Abraham Loeb
Surveys of faint galaxies at high redshifts often result in a "pencil-beam" geometry that is much longer along the line-of-sight than across the sky. We explore the effects of this…
The hyperfine transition of 3He+ as a probe of the intergalactic medium
J. S. Bagla, Abraham Loeb
We explore the prospects of using the hyperfine transition of 3He+ as a probe of the intergalactic medium. The emission signal from ionized regions during reionization is expected…
Probing the Epoch of Reionization with Milky Way Satellites
Joseph A. Muñoz, Piero Madau, Abraham Loeb +1
While the connection between high-redshift star formation and the local universe has recently been used to understand the observed population of faint dwarf galaxies in the Milky W…
The Pulsar Contribution to the Gamma-Ray Background
C. -A. Faucher-Giguere, Abraham Loeb
We estimate the contribution of Galactic pulsars, both ordinary and millisecond pulsars (MSPs), to the high-energy (>100 MeV) gamma-ray background. We pay particular attention to t…
The Event Horizon of Sagittarius A*
Avery E. Broderick, Abraham Loeb, Ramesh Narayan
Black hole event horizons, causally separating the external universe from compact regions of spacetime, are one of the most exotic predictions of General Relativity (GR). Until rec…
The Kinetic Sunyaev-Zel'dovich effect of the Milky Way Halo
Yuval Birnboim, Abraham Loeb
We calculate the expected imprint of the ionized gas in the Milky-Way halo on the Cosmic Microwave Background (CMB) through the kinetic Sunyaev-Zel'dovich (kSZ) effect. Unlike othe…
Upper Limit on Dimming of Cosmological Sources by Intergalactic Grey Dust from the Soft X-ray Background
Mark Dijkstra, Abraham Loeb
Active Galactic Nuclei (AGN) produce a dominant fraction (~80%) of the Soft X-ray background (SXB) at photon energies 0.5<E<2 keV. If dust pervaded throughout the intergalactic med…
First Light Sources at the End of the Dark Ages: Direct Observations of Population III Stars, Proto-Galaxies, and Supernovae During the Reionization Epoch
Jeff Cooke, Asantha Cooray, Ranga-Ram Chary +16
The cosmic dark ages are the mysterious epoch during which the pristine gas began to condense and ultimately form the first stars. Although these beginnings have long been a topic…
The Dynamic X-ray Sky of the Local Universe
Alicia M. Soderberg, Jonathan E. Grindlay, Joshua S. Bloom +35
Over the next decade, we can expect time domain astronomy to flourish at optical and radio wavelengths. In parallel with these efforts, a dedicated transient "machine" operating at…
In Situ Probes of the First Galaxies and Reionization: Gamma-ray Bursts
Matthew McQuinn, Joshua S. Bloom, Jonathan Grindlay +20
The first structures in the Universe formed at z>7, at higher redshift than all currently known galaxies. Since GRBs are brighter than other cosmological sources at high redshift a…
Cosmology from the Highly-Redshifted 21 cm Line
Steven Furlanetto, Adam Lidz, Abraham Loeb +26
One of the next decade's most exciting prospects is to explore the cosmic "dark ages," during which the first stars in the Universe formed, with the 21 cm line of neutral hydrogen.…