Search Publications
Magnetosonic wave instability by proton ring distributions: Simultaneous data and modeling
Xiao, Fuliang; Yang, Chang; Zhou, Qinghua +3 more
Simultaneous observations of enhanced fast magnetosonic (MS) waves and distinct proton ring distributions collected by Cluster satellite near the location L= 4-5 on 28 May 2005 are analyzed to study instability of MS waves. A sum of subtracted bi-Maxwellian components is utilized to fit the observed proton (2-10 keV) ring distributions. A ray-trac…
A Chandra Snapshot Survey for 3C Radio Galaxies with Redshifts between 0.3 and 0.5
Liuzzo, E.; Bonafede, A.; Massaro, F. +3 more
This paper contains an analysis of short Chandra observations of 19 3C sources with redshifts between 0.3 and 0.5 not previously observed in the X-rays. This sample is part of a project to obtain Chandra data for all of the extragalactic sources in the 3C catalog. Nuclear X-ray intensities as well as any X-ray emission associated with radio jet kn…
The Properties of Post-starburst Quasars Based on Optical Spectroscopy
Canalizo, Gabriela; Shang, Zhaohui; Brotherton, Michael S. +8 more
We present optical spectroscopy of a sample of 38 post-starburst quasars (PSQs) at z ~ 0.3, 29 of which have morphological classifications based on Hubble Space Telescope imaging. These broad-lined active galactic nuclei (AGNs) possess the spectral signatures of massive intermediate-aged stellar populations, making them potentially useful for stud…
Luminosity profiles and sizes of massive star clusters in NGC 7252
Bastian, N.; Larsen, S. S.; Kissler-Patig, M. +2 more
We present Hubble Space Telescope (HST) Wide-Field Camera 3 (WFC3) images of the merger remnant NGC 7252. In particular, we focus on the surface brightness profiles and effective radii Reff of 36 young massive clusters (YMCs) within the galaxy. All the clusters have masses exceeding 105 M⊙ and are, despite the 64 M…
A Direct Measurement of the Heat Release in the Outer Crust of the Transiently Accreting Neutron Star XTE J1709-267
Degenaar, N.; Wijnands, R.; Miller, J. M.
The heating and cooling of transiently accreting neutron stars provides a powerful probe of the structure and composition of their crust. Observations of superbursts and cooling of accretion-heated neutron stars require more heat release than is accounted for in current models. Obtaining firm constraints on the depth and magnitude of this extra he…
(Lack of) Cosmological evidence for dark radiation after Planck
Peiris, Hiranya V.; Verde, Licia; Feeney, Stephen M. +1 more
We use Bayesian model comparison to determine whether extensions to Standard-Model neutrino physics — primarily additional effective numbers of neutrinos and/or massive neutrinos — are merited by the latest cosmological data. Given the significant advances in cosmic microwave background (CMB) observations represented by the Planck data, we examine…
An Integral View of Fast Shocks Around Supernova 1006
Hughes, John P.; van de Ven, Glenn; Raymond, John C. +5 more
Supernova remnants are among the most spectacular examples of astrophysical pistons in our cosmic neighborhood. The gas expelled by the supernova explosion is launched with velocities ∼1000 kilometers per second into the ambient, tenuous interstellar medium, producing shocks that excite hydrogen lines. We have used an optical integral-field spectr…
Discovery of the Y1 Dwarf WISE J064723.23-623235.5
Cushing, Michael C.; Kirkpatrick, J. Davy; Gelino, Christopher R. +5 more
We present the discovery of a very cold, very low mass, nearby brown dwarf using data from the NASA Wide-field Infrared Survey Explorer (WISE). The object, WISE J064723.23-623235.5, has a very red WISE color of W1-W2 > 3.77 mag and a very red Spitzer Space Telescope color of ch1-ch2 = 2.82 ± 0.09 mag. In J MKO -ch2 color (7.58 ± 0.27…
Empirical Predictions for (Sub-)millimeter Line and Continuum Deep Fields
Carilli, Chris; Smail, Ian; Maiolino, Roberto +11 more
Modern (sub-)millimeter/radio interferometers such as ALMA, JVLA, and the PdBI successor NOEMA will enable us to measure the dust and molecular gas emission from galaxies that have luminosities lower than the Milky Way, out to high redshifts and with unprecedented spatial resolution and sensitivity. This will provide new constraints on the star fo…
Circumstellar habitable zones of binary-star systems in the solar neighbourhood
Eggl, S.; Haghighipour, N.; Pilat-Lohinger, E. +2 more
Binary and multiple systems constitute more than half of the total stellar population in the solar neighbourhood. Their frequent occurrence as well as the fact that more than 70 planets have already been discovered in such configurations - most notably the telluric companion of α Cen B - make them interesting targets in the search for habitable wo…