Search Publications
On the Kinematic Separation of Field and Cluster Stars across the Bulge Globular NGC 6528
Prada Moroni, P. G.; Milone, A. P.; Lagioia, E. P. +12 more
We present deep and precise multi-band photometry of the Galactic bulge globular cluster NGC 6528. The current data set includes optical and near-infrared images collected with ACS/WFC, WFC3/UVIS, and WFC3/IR on board the Hubble Space Telescope. The images cover a time interval of almost 10 yr, and we have been able to carry out a proper-motion se…
How Robust are the Size Measurements of High-redshift Compact Galaxies?
Ho, Luis C.; Huang, Song; Peng, Chien Y. +1 more
Massive quiescent galaxies at z ≈ 2 are apparently much more compact than galaxies of comparable mass today. How robust are these size measurements? We perform comprehensive simulations to determine possible biases and uncertainties in fitting single-component light distributions to real galaxies. In particular, we examine the robustness of the me…
Characterization of the Benchmark Binary NLTT 33370
Henning, Thomas; Skemer, Andrew; Leisenring, Jarron +16 more
We confirm the binary nature of the nearby, very low mass (VLM) system NLTT 33370 with adaptive optics imaging and present resolved near-infrared photometry and integrated light optical and near-infrared spectroscopy to characterize the system. VLT-NaCo and LBTI-LMIRCam images show significant orbital motion between 2013 February and 2013 April. O…
Formaldehyde Chemistry in Cometary Ices: On the Prospective Detection of NH2CH2OH, HOCH2OH, and POM by the On-board ROSINA Instrument of the Rosetta Mission
Duvernay, F.; Danger, G.; Theulé, P. +2 more
The thermal reactivity of a water-dominated cometary ice analog containing H2CO and NH3 is investigated by means of Fourier transform infrared spectroscopy, mass spectrometry, and B3LYP calculations. Three products are characterized by these techniques: aminomethanol (NH2CH2OH), methyleneglycol (HOCH
Derivation of an Analytical Approximation of the Spectrum of Spinning Dust Emission
Stevenson, Matthew A.
An analytical function for the spectrum of spinning dust emission is presented. It is derived through the application of careful approximations, with each step tested against numerical calculations. This approach ensures accuracy while providing an intuitive picture of the physics. The final result may be useful for fitting of anomalous microwave …
The Properties of Hα Emission-line Galaxies at Z = 2.24
Kong, Xu; Zheng, Xian Zhong; Gu, Qiu-Sheng +9 more
Using deep narrowband H 2 S1 and K s-band imaging data obtained with CFHT/WIRCam, we identify a sample of 56 Hα emission-line galaxies (ELGs) at z = 2.24 with the 5σ depths of H 2 S1 = 22.8 and K s = 24.8 (AB) over a 383 arcmin2 area in the Extended Chandra Deep Field South. A detailed analysi…
The Gaia Inertial Reference Frame and the Tilting of the Milky Way Disk
Spergel, David N.; Lindegren, Lennart; Perryman, Michael
While the precise relationship between the Milky Way disk and the symmetry planes of the dark matter halo remains somewhat uncertain, a time-varying disk orientation with respect to an inertial reference frame seems probable. Hierarchical structure formation models predict that the dark matter halo is triaxial and tumbles with a characteristic rat…
Tracing the Mass Growth and Star Formation Rate Evolution of Massive Galaxies from z ~ 6 to z ~ 1 in the Hubble Ultra-Deep Field
Stiavelli, Massimo; Franx, Marijn; van Dokkum, Pieter +8 more
We present an analysis of an H 160-selected photometric catalog of galaxies in the Hubble Ultra-Deep Field, using imaging from the WFC3/IR camera on the Hubble Space Telescope in combination with archival ultraviolet, optical, and near-infrared imaging. Using these data, we measure the spectral energy distributions of ~1500 galaxies to …
SUZAKU Observation of the Black Hole Binary 4U 1630-47 in the Very High State
Done, Chris; Shirahata, Mai; Ueda, Yoshihiro +7 more
We report the results from an X-ray and near-infrared observation of the Galactic black hole binary 4U 1630-47 in the very high state (VHS), performed with Suzaku and the Infrared Survey Facility around the peak of the 2012 September-October outburst. The X-ray spectrum is approximated by a steep power law, with photon index of 3.2, identifying th…
Plasma Flows in the Heliosheath along the Voyager 1 and 2 Trajectories due to Effects of the 11 yr Solar Cycle
Toth, G.; Richardson, J. D.; Opher, M. +2 more
We investigate the role of the 11 yr solar cycle variations in the solar wind (SW) parameters on the flows in the heliosheath using a new three-dimensional time-dependent model of the interaction between the SW and the interstellar medium. For boundary conditions in the model we use realistic time and the latitudinal dependence of the SW parameter…