Search Publications
The Debris Disk around γ Doradus Resolved with Herschel
Matthews, Brenda C.; Wilner, David J.; Kavelaars, J. J. +11 more
We present observations of the debris disk around γ Doradus, an F1V star, from the Herschel Key Programme DEBRIS (Disc Emission via Bias-free Reconnaissance in the Infrared/Submillimetre). The disk is well resolved at 70, 100, and 160 µm, resolved along its major axis at 250 µm, detected but not resolved at 350 µm, and confused w…
Parallel Electric Field Spectrum of Solar Wind Turbulence
Chen, C. H. K.; Mozer, F. S.
By searching through more than 10 satellite years of THEMIS and Cluster data, 3 reliable examples of parallel electric field turbulence in the undisturbed solar wind have been found. The perpendicular and parallel electric field spectra in these examples have similar shapes and amplitudes, even at large scales (frequencies below the ion gyroscale)…
The Discovery of Pulsating Hot Subdwarfs in NGC 2808
Brown, Thomas M.; Sweigart, Allen V.; Landsman, Wayne B. +2 more
We present the results of a Hubble Space Telescope program to search for pulsating hot subdwarfs in the core of NGC 2808. These observations were motivated by the recent discovery of such stars in the outskirts of ω Cen. Both NGC 2808 and ω Cen are massive globular clusters exhibiting complex stellar populations and large numbers of extreme horizo…
Probing the Cosmic X-Ray and MeV Gamma-Ray Background Radiation through the Anisotropy
Uchiyama, Yasunobu; Inoue, Yoshiyuki; Murase, Kohta +1 more
While the cosmic soft X-ray background is very likely to originate from individual Seyfert galaxies, the origin of the cosmic hard X-ray and MeV gamma-ray background is not fully understood. It is expected that Seyferts including Compton thick population may explain the cosmic hard X-ray background. At MeV energy range, Seyferts having non-thermal…
Suzaku Observations of the X-Ray Brightest Fossil Group ESO 3060170
Miller, Eric D.; White, Raymond E., III; Su, Yuanyuan
"Fossil" galaxy groups, each dominated by a relatively isolated giant elliptical galaxy, have many properties intermediate between groups and clusters of galaxies. We used the Suzaku X-ray observatory to observe the X-ray brightest fossil group, ESO 3060170, out to R 200, in order to better elucidate the relation between fossil groups, …
Galaxies in X-Ray Groups. III. Satellite Color and Morphology Transformations
Ma, Chung-Pei; Leauthaud, Alexie; Vulcani, Benedetta +5 more
While the star formation rates and morphologies of galaxies have long been known to correlate with their local environment, the process by which these correlations are generated is not well understood. Galaxy groups are thought to play an important role in shaping the physical properties of galaxies before entering massive clusters at low redshift…
Multiple Fast Molecular Outflows in the Pre-planetary Nebula CRL 618
Lee, Chin-Fei; Sahai, Raghvendra; Sánchez Contreras, Carmen +2 more
CRL 618 is a well-studied pre-planetary nebula. It has multiple highly collimated optical lobes, fast molecular outflows along the optical lobes, and an extended molecular envelope that consists of a dense torus in the equator and a tenuous round halo. Here we present our observations of this source in CO J = 3-2 and HCN J = 4-3 obtained with the …
A Suzaku Discovery of a Slowly Varying Hard X-Ray Continuum from the Type I Seyfert Galaxy NGC 3516
Makishima, Kazuo; Nakazawa, Kazuhiro; Yamada, Shin'ya +1 more
The bright type I Seyfert galaxy NGC 3516 was observed by Suzaku twice, in 2005 October 12-15 and 2009 October 28-November 2, for a gross time coverage of 242 and 544 ks and a net exposure of 134 and 255 ks, respectively. The 2-10 keV luminosity was 2.8 × 1041 erg s-1 in 2005 and 1.6 × 1041 erg s-1 in 20…
The Association of Polar Faculae with Polar Magnetic Patches Examined with Hinode Observations
Kubo, M.; Tsuneta, S.; Suematsu, Y. +2 more
The magnetic properties of the Sun's polar faculae are investigated with spectropolarimetric observations of the north polar region obtained by the Hinode satellite in 2007 September. Polar faculae are embedded in nearly all magnetic patches with fluxes greater than 1018 Mx, while magnetic patches without polar faculae dominate in the f…
Outflow versus Infall in Spiral Galaxies: Metal Absorption in the Halo of NGC 891
Miller, Eric D.; Bregman, Joel N.; Seitzer, Patrick +2 more
Gas accreting onto a galaxy will be of low metallicity while halo gas due to a galactic fountain will be of near-solar metallicity. We test these predictions by measuring the metal absorption line properties of halo gas 5 kpc above the plane of the edge-on galaxy NGC 891, using observations taken with HST/STIS toward a bright background quasar. Me…