Search Publications
The AU Mic Debris Disk: Far-infrared and Submillimeter Resolved Imaging
Ivison, R. J.; Dent, W. R. F.; Matthews, Brenda C. +20 more
We present far-infrared and submillimeter maps from the Herschel Space Observatory and the James Clerk Maxwell Telescope of the debris disk host star AU Microscopii. Disk emission is detected at 70, 160, 250, 350, 450, 500, and 850 µm. The disk is resolved at 70, 160, and 450 µm. In addition to the planetesimal belt, we detect thermal …
Sixteen Years of Ulysses Interstellar Dust Measurements in the Solar System. II. Fluctuations in the Dust Flow from the Data
Krüger, Harald; Sterken, Veerle J.; Strub, Peter
The Ulysses spacecraft provided the first opportunity to identify and study interstellar dust (ISD) in situ in the solar system between 1992 and 2007. Here we present the first comprehensive analysis of the ISD component in the entire Ulysses dust data set. We analyzed several parameters of the ISD flow in a time-resolved fashion: flux, flow direc…
From Diversity to Dichotomy, and Quenching: Milky-Way-like and Massive Galaxy Progenitors at 0.5 < z <3.0
Patel, Shannon G.; Kajisawa, Masaru; Morishita, Takahiro +4 more
Using the Hubble Space Telescope (HST)/WFC3 and Advanced Camera for Surveys multi-band imaging data taken in CANDELS and 3D-HST, we study the general properties and diversity of the progenitors of the Milky Way (MWs) and local massive galaxy (MGs) at 0.5\lt z\lt 3.0, based on a constant cumulative number density analysis. After careful data reduct…
Mapping the Outer Edge of the Young Stellar Cluster in the Galactic Center
Lu, J. R.; Do, T.; Ghez, A. +3 more
We present new near-infrared spectroscopic observations of the outer edges of the young stellar cluster around the supermassive black hole at the Galactic center. The observations show a break in the surface density profile of young stars at ∼13″ (0.52 pc). These observations spectroscopically confirm previous suggestions of a break based on photo…
The Role of Bars in AGN Fueling in Disk Galaxies Over the Last Seven Billion Years
Santini, Paola; Knapen, Johan H.; Salvato, Mara +3 more
We present empirical constraints on the influence of stellar bars on the fueling of active galactic nuclei (AGNs) out to z = 0.84 using a sample of X-ray-selected AGNs hosted in luminous non-interacting face-on and moderately inclined disk galaxies from the Chandra COSMOS survey. Using high-resolution Hubble Space Telescope imaging to identify bar…
Forward Modeling of Standing Slow Modes in Flaring Coronal Loops
Banerjee, D.; Antolin, P.; Van Doorsselaere, T. +1 more
Standing slow-mode waves in hot flaring loops are exclusively observed in spectrometers and are used to diagnose the magnetic field strength and temperature of the loop structure. Owing to the lack of spatial information, the longitudinal mode cannot be effectively identified. In this study, we simulate standing slow-mode waves in flaring loops an…
The Multi-layer Variable Absorbers in NGC 1365 Revealed by XMM-Newton and NuSTAR
Harrison, F.; Stern, D.; Zhang, W. W. +15 more
Between 2012 July and 2013 February, NuSTAR and XMM-Newton performed four long-look joint observations of the type 1.8 Seyfert, NGC 1365. We have analyzed the variable absorption seen in these observations in order to characterize the geometry of the absorbing material. Two of the observations caught NGC 1365 in an unusually low absorption state, …
Active-region Tilt Angles: Magnetic versus White-light Determinations of Joy's Law
Li, J.; Wang, Y. -M.; Baranyi, T. +1 more
The axes of solar active regions are inclined relative to the east-west direction, with the tilt angle tending to increase with latitude ("Joy's law"). Observational determinations of Joy's law have been based either on white-light images of sunspot groups or on magnetograms, where the latter have the advantage of measuring directly the physically…
Predicting CME Ejecta and Sheath Front Arrival at L1 with a Data-constrained Physical Model
Hess, Phillip; Zhang, Jie
We present a method for predicting the arrival of a coronal mass ejection (CME) flux rope in situ, as well as the sheath of solar wind plasma accumulated ahead of the driver. For faster CMEs, the front of this sheath will be a shock. The method is based upon geometrical separate measurement of the CME ejecta and sheath. These measurements are used…
Multi-wavelength Observations of 3FGL J2039.6-5618: A Candidate Redback Millisecond Pulsar
Greiner, J.; Belfiore, A.; Marelli, M. +8 more
We present multi-wavelength observations of the unassociated γ-ray source 3FGL J2039.6-5618 detected by the Fermi Large Area Telescope. The source γ-ray properties suggest that it is a pulsar, most likely a millisecond pulsar, for which neither radio nor γ-ray pulsations have been detected. We observed 3FGL J2039.6-5618 with XMM-Newton and discove…