Search Publications
The Chandra View of Nearby X-Shaped Radio Galaxies
Reynolds, Christopher S.; Cheung, Chi C.; Miller, M. Coleman +1 more
We present new and archival Chandra X-ray Observatory observations of X-shaped radio galaxies (XRGs) within z ~ 0.1 alongside a comparison sample of normal double-lobed FR I and II radio galaxies. By fitting elliptical distributions to the observed diffuse hot X-ray emitting atmospheres (either the interstellar or intragroup medium), we find that …
Distribution of Satellite Galaxies in High-redshift Groups
Hwang, Ho Seong; Park, Changbom; Chen, Xuelei +1 more
We use galaxy groups at redshifts between 0.4 and 1.0 selected from the Great Observatories Origins Deep Survey to study the color-morphological properties of satellite galaxies and investigate possible alignment between the distribution of the satellites and the orientation of their central galaxy. We confirm the bimodal color and morphological-t…
The Solar Minimum Corona from Differential Emission Measure Tomography
Frazin, Richard A.; Vásquez, Alberto M.; Manchester, Ward B., IV
We present results derived from a dual-spacecraft tomographic reconstruction of the solar corona's three-dimensional (3D) extreme ultraviolet (EUV) emissivity. We use simultaneously taken STEREO A and B spacecraft EUVI images from Carrington rotation 2077 (UT 2008 November 20 06:56 through UT December 17 14:34). During this period, the spacecraft …
Fermi Large Area Telescope Observations of PSR J1836+5925
Caraveo, P. A.; Frailis, M.; Orlando, E. +179 more
The discovery of the γ-ray pulsar PSR J1836+5925, powering the formerly unidentified EGRET source 3EG J1835+5918, was one of the early accomplishments of the Fermi Large Area Telescope (LAT). Sitting 25° off the Galactic plane, PSR J1836+5925 is a 173 ms pulsar with a characteristic age of 1.8 million years, a spindown luminosity of 1.1 × 103…
Galaxy Evolution in a Complex Environment: A Multi-wavelength Study of HCG 7
Hornschemeier, A. E.; Konstantopoulos, I. S.; Mendes de Oliveira, C. +17 more
The environment where galaxies are found heavily influences their evolution. Close groupings, like the ones in the cores of galaxy clusters or compact groups, evolve in ways far more dramatic than their isolated counterparts. We have conducted a multi-wavelength study of Hickson Compact Group 7 (HCG 7), consisting of four giant galaxies: three spi…
A First Glimpse Into the Far-IR Properties of High-z UV-selected galaxies: Herschel/PACS Observations of z ~ 3 LBGs
Berta, S.; Magnelli, B.; Nordon, R. +33 more
We present first insights into the far-IR properties for a sample of IRAC and MIPS 24 µm detected Lyman break galaxies (LBGs) at z ~ 3, as derived from observations in the northern field of the Great Observatories Origins Survey (GOODS-N) carried out with the PACS instrument on board the Herschel Space Observatory. Although none of our galax…
On the Constancy of the Solar Radius. III.
Kuhn, J. R.; Bush, R. I.; Emilio, M.
The Michelson Doppler Imager on board the Solar and Heliospheric Observatory satellite has operated for over a sunspot cycle. This instrument is now relatively well understood and provides a nearly continuous record of the solar radius in combination with previously developed algorithms. Because these data are obtained from above Earth's atmospher…
The Mass of the Candidate Exoplanet Companion to HD 136118 from Hubble Space Telescope Astrometry and High-Precision Radial Velocities
Harrison, Thomas E.; Bean, Jacob L.; Benedict, G. Fritz +3 more
We use Hubble Space Telescope fine guidance sensor astrometry and high-cadence radial velocities for HD 136118 from the Hobby-Eberly Telescope with archival data from Lick to determine the complete set of orbital parameters for HD 136118 b. We find an orbital inclination for the candidate exoplanet of ib = 163fdg1 ± 3fdg0. This establis…
Cosmic Origins Spectrograph and FUSE Observations of T ~ 105 K Gas in a Nearby Galaxy Filament
Sembach, Kenneth R.; Savage, Blair D.; Shull, J. Michael +4 more
We present a clear detection of a broad Lyα absorber (BLA) with a matching O VI line in the nearby universe. The BLA is detected at z(Lyα}) = 0.01028 in the high signal-to-noise ratio spectrum of Mrk 290 obtained using the Cosmic Origins Spectrograph. The Lyα absorption has two components, with b(H I) = 55 ± 1 km s-1 and b(H I) = 33 ± 1…
Hinode Solar Optical Telescope Observations of the Source Regions and Evolution of "Type II" Spicules at the Solar Polar Limb
Moore, Ronald L.; Sterling, Alphonse C.; DeForest, Craig E.
We examine solar spicules using high-cadence Ca II data of the north pole coronal hole region, using the Solar Optical Telescope (SOT) on the Hinode spacecraft. The features we observe are referred to as "Type II" spicules by De Pontieu et al. in 2007. By convolving the images with the inverse-point-spread function for the SOT Ca II filter, we are…