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Estimating Black Hole Masses of AGNs using Ultraviolet Emission Line Properties
Wang, Ran; Wu, Xue-Bing; Kong, Min-Zhi +1 more
Based on measured broad line region sizes in the reverberation-mapping AGN sample, two new empirical relations are introduced to estimate the central black hole masses of radio-loud high-redshift (z>0.5) AGNs. First, using the archival IUE/HST spectroscopy data at UV band for the reverberation-mapping objects, we obtained two new empirical rela…
Low-Redshift Intergalactic Absorption Lines in the Spectrum of HE 0226-4110
Savage, B. D.; Wakker, B. P.; Sembach, K. R. +2 more
We present an analysis of the FUSE and HST STIS E140M spectra of HE 0226-4110 (z=0.495). We detect 56 Lyman absorbers and five O VI absorbers. The number of intervening O VI systems per unit redshift with Wλ>~50 mÅ is dN(O VI)/dz~11. The O VI systems unambiguously trace hot gas only in one case. For the four other O VI systems, photo…
Direct Measurement of the Size of 2003 UB313 from the Hubble Space Telescope
Brown, M. E.; Schaller, E. L.; Roe, H. G. +2 more
We have used the Hubble Space Telescope to directly measure the angular size of the large Kuiper Belt object 2003 UB313. By carefully calibrating the point-spread function of a nearby field star, we measure the size of 2003 UB313 to be 34.3+/-1.4 mas, corresponding to a diameter of 2400+/-100 km or a size ~5% larger than Pluto. The V-band geometri…
A posteriori detection of the planetary transit of HD 189733 b in the Hipparcos photometry
Hébrard, G.; Lecavelier Des Etangs, A.
Context: Aims: Using observations performed at the Haute-Provence Observatory, the detection of a 2.2-day orbital period extra-solar planet that transits the disk of its parent star, HD 189733, has been recently reported. We searched in the Hipparcos photometry Catalogue for possible detections of those transits. Methods: Statistic studies were pe…
Cluster observations in the magnetosheath - Part 1: Anisotropies of the wave vector distribution of the turbulence at electron scales
Maksimovic, M.; Trávníček, P.; Cornilleau-Wehrlin, N. +5 more
We analyse the power spectral density δB2 and δE2 of the magnetic and electric fluctuations measured by Cluster 1 (Rumba) in the magnetosheath during 23 h, on four different days. The frequency range of the STAFF Spectral Analyser (f=8 Hz to 4 kHz) extends from about the lower hybrid frequency, i.e. the electromagnetic (e.m.)…
GALEX Observations of ``Passive Spirals'' in the Cluster Cl 0024+17: Clues to the Formation of S0 Galaxies
Smith, Graham P.; Treu, Tommaso; Ellis, Richard S. +4 more
We present new results from deep GALEX UV imaging of the cluster Cl 0024+17 at z~0.4. Rest-frame far-UV emission is detected from a large fraction of so-called passive spiral galaxies-a significant population that exhibits spiral morphology with little or no spectroscopic evidence of ongoing star formation. This population is thought to represent …
New members in the Upper Scorpius association from the UKIRT Infrared Deep Sky Survey Early Data Release†
Hambly, N. C.; Jameson, R. F.; Lodieu, N.
We present the results of a 9.3-deg2 infrared (ZYJHK) survey in the Upper Scorpius association extracted from the UKIRT Infrared Deep Sky Survey (UKIDSS) Galactic Cluster Survey Early Data Release. We have selected a total of 112 candidates from the (Z-J, Z) colour-magnitude diagram over the Z= 12.5-20.5 magnitude range, corresponding t…
Wind accretion in the massive X-ray binary 4U 2206+54 : abnormally slow wind and a moderately eccentric orbit
Reig, P.; Torrejón, J. M.; Negueruela, I. +2 more
Massive X-ray binaries are usually classified by the properties of the donor star in classical, supergiant and Be X-ray binaries, the main difference being the mass transfer mechanism between the two components. The massive X-ray binary
Bursty Bulk Flow Driven Turbulence in the Earth's Plasma Sheet
Nakamura, R.; Baumjohann, W.; Volwerk, M. +2 more
During the last several years significant progress has been made in understanding MHD turbulence in the Earth’s plasma sheet. Due to the statistically transitory properties of fluctuations, finite size and boundary effects, however, issues of fundamental importance remain unresolved. Here we concentrate on such intrinsic features of plasma sheet t…
On the orbits and masses of the satellites of the Pluto Charon system
Lee, Man Hoi; Peale, S. J.
Two small satellites of Pluto, S/2005 P1 (hereafter P1) and S/2005 P2 (hereafter P2), have recently been discovered outside the orbit of Charon, and their orbits are nearly circular and nearly coplanar with that of Charon. Because the mass ratio of Charon-Pluto is ∼0.1, the orbits of P2 and P1 are significantly non-Keplerian even if P2 and P1 have…