Search Publications
Planck Lensing and Cosmic Infrared Background Cross-correlation with Fermi-LAT: Tracing Dark Matter Signals in the Gamma-ray Background
Cooray, Asantha; Feng, Chang; Keating, Brian
The extragalactic γ-ray background and its spatial anisotropy could potentially contain a signature of dark matter (DM) annihilation or particle decay. Astrophysical foregrounds, such as blazars and star-forming galaxies (SFGs), however, dominate the γ-ray background, precluding an easy detection of the signal associated with the DM annihilation o…
Listing of 502 Times When the Ulysses Magnetic Fields Instrument Observed Waves Due to Newborn Interstellar Pickup Protons
Isenberg, Philip A.; Murphy, Neil; Cannon, Bradford E. +4 more
In two earlier publications we analyzed 502 intervals of magnetic waves excited by newborn interstellar pickup protons that were observed by the Ulysses spacecraft. Due to the considerable effort required in identifying these events, we provide a list of the times for the 502 wave event intervals previously identified. In the process, we provide a…
A Comparison of the Most Massive Quiescent Galaxies from z ∼ 3 to the Present: Slow Evolution in Size, and spheroid-dominated
Patel, Shannon G.; Quadri, Ryan F.; Williams, Rik J. +2 more
We use Hubble Space Telescope imaging to study the structural properties of 10 of the most massive (M≥slant {10}11.25 {M}⊙ ) quiescent galaxies (QGs) in the UKIDSS UDS at 2.5< z< 3.0. The low spatial density of these galaxies required targeted WFC3 H 160 imaging, as such systems are rare in existing surveys l…
Extremely Red Submillimeter Galaxies: New z ≳ 4-6 Candidates Discovered using ALMA and Jansky VLA
Ivison, R. J.; Tamura, Yoichi; Kohno, Kotaro +18 more
We present the detailed characterization of two extremely red submillimeter galaxies (SMGs), ASXDF1100.053.1 and 231.1, with the Atacama Large Millimeter/submillimeter Array (ALMA) and the Jansky Very Large Array. These SMGs were originally selected using AzTEC at 1100 µm, and are observed by Herschel to be faint at 100-500 µm. Their (…
The Characteristics of Thin Magnetic Flux Tubes in the Lower Solar Atmosphere Observed by Hinode/SOT in the G band and in Ca II H Bright Points
Xiong, Jianping; Yang, Yunfei; Jin, Chunlan +5 more
Photospheric bright points (PBPs) and chromospheric bright points (CBPs) reflect the cross sections of magnetic flux tubes at different heights of the lower solar atmosphere. We aim to study the fine 3D structures and transportation dynamics of the magnetic flux tubes using G-band and simultaneous Ca II H image-series from the Solar Optical Telesc…
Geometric Corroboration of the Earliest Lensed Galaxy at z ≃ 10.8 from Robust Free-form Modelling
Broadhurst, Tom; Zitrin, Adi; Coe, Dan +4 more
A multiply lensed galaxy, MACS0647-JD, with a probable photometric redshift of z≃ {10.7}-0.4+0.6 is claimed to constitute one of the very earliest known galaxies, formed well before reionization was completed. However, spectral evidence that MACS0647-JD lies at high redshift has proven infeasible and so here we seek an indepe…
Transient Spiral Arms from Far Out-of-equilibrium Gravitational Evolution
Sylos Labini, Francesco; Benhaiem, David; Joyce, Michael
We describe how a simple class of out-of-equilibrium, rotating, and asymmetrical mass distributions evolve under their self-gravity to produce a quasi-planar spiral structure surrounding a virialized core, qualitatively resembling a spiral galaxy. The spiral structure is transient, but can survive tens of dynamical times, and further reproduces qu…
Evidence for Binarity and Possible Disk Obscuration in Kepler Observations of the Pulsating RV Tau Variable DF Cygni
Stassun, Keivan G.; Somers, Garrett; Vega, Laura D. +2 more
The Kepler light curve of DF Cyg is unparalleled in precision and cadence for any RV Tau star to date, spanning a baseline of ∼4 years and clearly displaying the signature pulsating behavior of alternating deep and shallow minima as well as the long-term trend indicative of an RVb-type variable. We measure DF Cyg’s formal period (the time interval…
An XMM-Newton and NuSTAR Study of IGR J18214-1318: A Non-pulsating High-mass X-Ray Binary with a Neutron Star
Fürst, Felix; Pottschmidt, Katja; Wilms, Jörn +5 more
IGR J18214-1318, a Galactic source discovered by the International Gamma-Ray Astrophysics Laboratory, is a high-mass X-ray binary (HMXB) with a supergiant O-type stellar donor. We report on the XMM-Newton and NuSTAR observations that were undertaken to determine the nature of the compact object in this system. This source exhibits high levels of a…
The Relativistic Jet-accretion Flow-Wind Connection in Mrk 231
O'Dea, Christopher P.; Miniutti, Giovanni; Punsly, Brian +2 more
Long-term radio monitoring of the broad absorption line (BAL) quasar Mrk 231 at 17.6 GHz detected a strong flare in 2015. This triggered four epochs of Very Long Baseline Array (VLBA) observations from 8.4 to 43 GHz as well as three epochs of X-ray observations with NuSTAR and two with XMM over a 15 week period. Two ejected components were detecte…