Search Publications
Homologous Flux Ropes Observed by the Solar Dynamics Observatory Atmospheric Imaging Assembly
Li, Ting; Zhang, Jun
We present the first Solar Dynamics Observatory observations of four homologous flux ropes in the active region (AR) 11745 on 2013 May 20-22. The four flux ropes are all above the neutral line of the AR, with endpoints anchoring at the same region, and have a generally similar morphology. The first three flux ropes rose with a velocity of less tha…
GRB060218 as a Tidal Disruption of a White Dwarf by an Intermediate-mass Black Hole
Reynolds, Christopher S.; Shcherbakov, Roman V.; Pe'er, Asaf +3 more
The highly unusual pair of a gamma-ray burst (GRB) GRB060218 and an associated supernova, SN2006aj, has puzzled theorists for years. A supernova shock breakout and a jet from a newborn stellar mass compact object have been proposed to explain this pair's multiwavelength signature. Alternatively, we propose that the source is naturally explained by…
A Herschel Survey of the [N II] 205 µm Line in Local Luminous Infrared Galaxies: The [N II] 205 µm Emission as a Star Formation Rate Indicator
Sanders, D. B.; Isaak, K. G.; Iwasawa, K. +16 more
We present, for the first time, a statistical study of [N II] 205 µm line emission for a large sample of local luminous infrared galaxies using Herschel Spectral and Photometric Imaging Receiver Fourier Transform Spectrometer (SPIRE FTS) data. For our sample of galaxies, we investigate the correlation between the [N II] luminosity (L [N…
Reverberation and Photoionization Estimates of the Broad-line Region Radius in Low-z Quasars
Sulentic, Jack W.; Marziani, Paola; Negrete, C. Alenka +1 more
Black hole mass estimation in quasars, especially at high redshift, involves the use of single-epoch spectra with signal-to-noise ratio and resolution that permit accurate measurement of the width of a broad line assumed to be a reliable virial estimator. Coupled with an estimate of the radius of the broad-line region (BLR) this yields the black h…
Discovery of Lyman Break Galaxies at z ~ 7 from the zFourGE Survey
Kelson, D. D.; Ferguson, H. C.; Finkelstein, S. L. +22 more
Star-forming galaxies at redshifts z > 6 are likely responsible for the reionization of the universe, and it is important to study the nature of these galaxies. We present three candidates for z ~ 7 Lyman break galaxies (LBGs) from a 155 arcmin2 area in the CANDELS/COSMOS field imaged by the deep FourStar Galaxy Evolution (zFourGE) s…
Polarimetry in the Hard X-Ray Domain with INTEGRAL SPI
Clark, D. J.; Jourdain, E.; Roques, J. P. +1 more
We present recent improvements in polarization analysis with the INTEGRAL SPI data. The SPI detector plane consists of 19 independent Ge crystals and can operate as a polarimeter. The anisotropy characteristics of Compton diffusions can provide information on the polarization parameters of the incident flux. By including the physics of the polariz…
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…
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…
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…