Search Publications
Erratum: "Joint Analysis of Cluster Observations. II. Chandra/XMM-Newton X-Ray and Weak Lensing Scaling Relations for a Sample of 50 Rich Clusters of Galaxies" (2013, ApJ, 767, 116)
Hoekstra, Henk; Babul, Arif; Mahdavi, Andisheh +3 more
Physical Nature of the [S II]-bright Shell Nebulae N70 and N185
Gruendl, R. A.; Chu, You-Hua; Chen, Yang +3 more
N70 and N185 are two large (>=100 pc in diameter) shell nebulae in the Large Magellanic Cloud (LMC). Their high [S II]/Hα ratios rival those of supernova remnants (SNRs), but they are not confirmed as SNRs. To study their physical nature, we have obtained XMM-Newton X-ray observations and high-dispersion long-slit echelle spectroscopic observat…
Modeling Active Region Transient Brightenings Observed with X-Ray Telescope as Multi-stranded Loops
McKenzie, David E.; Donachie, Martin; Kobelski, Adam R.
Strong evidence exists that coronal loops as observed in extreme ultraviolet and soft X-rays may not be monolithic isotropic structures, but can often be more accurately modeled as bundles of independent strands. Modeling the observed active region transient brightenings (ARTBs) within this framework allows for the exploration of the energetic ram…
Fe-rich Ejecta in the Supernova Remnant G352.7-0.1 with Suzaku
Sezer, A.; Gök, F.
In this work, we present results from a ~201.6 ks observation of G352.7-0.1 using the X-ray Imaging Spectrometer on board Suzaku X-ray Observatory. The X-ray emission from the remnant is well described by two-temperature thermal models of non-equilibrium ionization with variable abundances with a column density of N H ~ 3.3 × 1022<…
Early-type Galaxies at Intermediate Redshift Observed with Hubble Space Telescope WFC3: Perspectives on Recent Star Formation
Hathi, Nimish P.; Rutkowski, Michael J.; Windhorst, Rogier A. +7 more
We present an analysis of the stellar populations of 102 visually selected early-type galaxies (ETGs) with spectroscopic redshifts (0.35 lsim z lsim 1.5) from observations in the Early Release Science program with the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST). We fit one- and two-component synthetic stellar models to the ETGs …
Full Particle Electromagnetic Simulations of Entropy Generation across a Collisionless Shock
Wang, Rui; Yang, Zhongwei; Liu, Ying D. +5 more
Experimental data from Cluster have shown that entropy density can be generated across Earth's bow shock. These new observations are a starting point for a more sophisticated analysis that includes computer modeling of a collisionless shock using observed shock parameters as input. In this Letter, we present the first comparison between observatio…
Tracing Recent Star Formation of Red Early-type Galaxies out to z ~ 1
Im, Myungshin; Lee, Jong Chul; Hwang, Ho Seong +3 more
We study the mid-infrared (IR) excess emission of early-type galaxies (ETGs) on the red sequence at z < 1 using a spectroscopic sample of galaxies in the fields of Great Observatories Origins Deep Survey (GOODS). In the mass-limited sample of 1025 galaxies with M star > 1010.5 M ⊙ and 0.4 < z < 1.05, we…
Imaging Comet ISON C/2012 S1 in the Inner Corona at Perihelion
Morgan, Huw; Habbal, Shadia Rifai; Druckmüller, Miloslav +2 more
Much anticipation and speculation were building around comet ISON, or C/2012 S1, discovered on 2012 September 21 by the International Scientific Optical Network telescope in Russia, and bound for the Sun on 2013 November 28, with a closest heliocentric approach distance of 2.7 R ⊙. Here we present the first white light image of the come…
The Origin of the X-Ray Emission from the High-velocity Cloud MS30.7-81.4-118
Henley, David B.; Shelton, Robin L.; Kwak, Kyujin
A soft X-ray enhancement has recently been reported toward the high-velocity cloud MS30.7-81.4-118 (MS30.7), a constituent of the Magellanic Stream. In order to investigate the origin of this enhancement, we have analyzed two overlapping XMM-Newton observations of this cloud. We find that the X-ray enhancement is ~6' or ~100 pc across, and is conc…
Deconvolving X-Ray Spectral Variability Components in the Seyfert 1.5 NGC 3227
Arévalo, P.; Markowitz, A.
We present the variability analysis of a 100 ks XMM-Newton observation of the Seyfert 1.5 active galaxy, NGC 3227. The observation found NGC 3227 in a period where its hard power-law component displayed remarkably little long-term variability. This lucky event allows us to clearly observe a soft spectral component undergoing a large-amplitude but …