Search Publications
Strong Far-infrared Cooling Lines, Peculiar CO Kinematics, and Possible Star-formation Suppression in Hickson Compact Group 57
Appleton, P. N.; Xu, C. K.; Charmandaris, V. +14 more
We present [C II] and [O I] observations from Herschel and CO(1-0) maps from the Combined Array for Research in Millimeter Astronomy (CARMA) of the Hickson compact group HCG 57, focusing on the galaxies HCG 57a and HCG 57d. HCG 57a has been previously shown to contain enhanced quantities of warm molecular hydrogen consistent with shock or turbulen…
Interaction between Two Coronal Mass Ejections in the 2013 May 22 Large Solar Energetic Particle Event
Li, Gang; Ding, Liu-Guan; Chen, Yao +7 more
We investigate the eruption and interaction of two coronal mass ejections (CMEs) during the large 2013 May 22 solar energetic particle event using multiple spacecraft observations. Two CMEs, having similar propagation directions, were found to erupt from two nearby active regions (ARs), AR11748 and AR11745, at ~08:48 UT and ~13:25 UT, respectively…
NuSTAR J033202-2746.8: Direct Constraints on the Compton Reflection in a Heavily Obscured Quasar at z ≈ 2
Harrison, F. A.; Stern, D.; Zhang, W. W. +25 more
We report Nuclear Spectroscopic Telescope Array (NuSTAR) observations of NuSTAR J033202-2746.8, a heavily obscured, radio-loud quasar detected in the Extended Chandra Deep Field-South, the deepest layer of the NuSTAR extragalactic survey (~400 ks, at its deepest). NuSTAR J033202-2746.8 is reliably detected by NuSTAR only at E > 8 keV and has a …
Confirmation of a High Magnetic Field in GRO J1008-57
Hailey, Charles J.; Chakrabarty, Deepto; Fürst, Felix +11 more
GRO J1008-57 is a high-mass X-ray binary for which several claims of a cyclotron resonance scattering feature near 80 keV have been reported. We use NuSTAR, Suzaku, and Swift data from its giant outburst of 2012 November to confirm the existence of the 80 keV feature and perform the most sensitive search to date for cyclotron scattering features a…
Optical Observations of the Type Ic Supernova 2007gr in NGC 1058
Filippenko, Alexei V.; Li, Weidong; Wang, Xiaofeng +6 more
We present extensive optical observations of the normal Type Ic supernova (SN) 2007gr, spanning from about one week before maximum light to more than one year thereafter. The optical light and color curves of SN 2007gr are very similar to those of the broad-lined Type Ic SN 2002ap, but the spectra show remarkable differences. The optical spectra o…
Shock-Cloud Interaction and Particle Acceleration in the Southwestern Limb of SN 1006
Miceli, M.; Bocchino, F.; Decourchelle, A. +3 more
The supernova remnant SN 1006 is a powerful source of high-energy particles and evolves in a relatively tenuous and uniform environment despite interacting with an atomic cloud in its northwestern limb. The X-ray image of SN 1006 reveals an indentation in the southwestern part of the shock front and the H I maps show an isolated (southwestern) clo…
Salpeter Normalization of the Stellar Initial Mass Function for Massive Galaxies at z ~ 1
Cappellari, Michele; Shetty, Shravan
The stellar initial mass function (IMF) is a key parameter for studying galaxy evolution. Here we measure the IMF mass normalization for a sample of 68 field galaxies in the redshift range 0.7-0.9 within the Extended Groth Strip. To do this we derive the total (stellar + dark matter) mass-to-light [(M/L)] ratio using axisymmetric dynamical models.…
The Three-dimensional Analysis of Hinode Polar Jets using Images from LASCO C2, the Stereo COR2 Coronagraphs, and SMEI
Jackson, B. V.; Buffington, A.; Hick, P. P. +3 more
Images recorded by the X-ray Telescope on board the Hinode spacecraft are used to provide high-cadence observations of solar jetting activity. A selection of the brightest of these polar jets shows a positive correlation with high-speed responses traced into the interplanetary medium. LASCO C2 and STEREO COR2 coronagraph images measure the coronal…
A Clumpy Stellar Wind and Luminosity-dependent Cyclotron Line Revealed by the First Suzaku Observation of the High-mass X-Ray Binary 4U 1538-522
Hemphill, Paul B.; Rothschild, Richard E.; Fürst, Felix +3 more
We present results from the first Suzaku observation of the high-mass X-ray binary 4U 1538-522. The broadband spectral coverage of Suzaku allows for a detailed spectral analysis, characterizing the cyclotron resonance scattering feature at 23.0 ± 0.4 keV and the iron Kα line at 6.426 ± 0.008 keV, as well as placing limits on the strengths of the i…
Around the Ring We Go: The Cold, Dense Ring of Molecular Gas in NGC 1614
Wilson, Christine D.; Iono, Daisuke; Matsushita, Satoki +2 more
We present high-resolution archival Atacama Large Millimeter/submillimeter Array (ALMA) 12CO J = 3-2 and J = 6-5 and HCO+ J = 4-3 observations and new CARMA 12CO and 13CO J = 1-0 observations of the luminous infrared galaxy NGC 1614. The high-resolution maps show the previously identified ring-like struc…