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High-Mass Triple Systems: The Classical Cepheid Y Carinae
Evans, Nancy Remage; Carpenter, Kenneth G.; Robinson, Richard +2 more
We have obtained a Hubble Space Telescope STIS ultraviolet high-dispersion echelle-mode spectrum of the binary companion of the double-mode classical Cepheid Y Car. The velocity measured for the hot companion from this spectrum is very different from reasonable predictions for binary motion, implying that the companion is itself a short-period bin…
Comparison of Interplanetary Disturbances at the NEAR Spacecraft with Coronal Mass Ejections at the Sun
Russell, C. T.; Andrews, M. D.; Mulligan, T. +4 more
We examined interplanetary (IP) magnetic field disturbances recorded by the Near Earth Asteroid Rendezvous-Shoemaker spacecraft (NEAR) when it was above either the east or west solar limb as seen from Earth; we then identified the associated coronal mass ejections (CMEs) detected above the limbs by the SOHO LASCO coronagraph. We found 10 cases in …
Homogeneous Photometry. V. The Globular Cluster NGC 4147
Catelan, M.; Stetson, Peter B.; Smith, Horace A.
New BVRI broadband photometry and astrometry are presented for the globular cluster NGC 4147, based upon measurements derived from 524 ground-based CCD images mostly either donated by colleagues or retrieved from public archives. We have also reanalyzed five exposures of the cluster obtained with WFPC2 on the Hubble Space Telescope in the F439W an…
The broad-band X-ray spectrum of the blazar PKS B1830-211 by Chandra and INTEGRAL
Piro, L.; de Rosa, A.; Tramacere, A. +6 more
In this paper we present a broad-band study of the X-ray emission of the blazar PKS 1830-211 based on Chandra and INTEGRAL observations. Notwithstanding the high redshift (z=2.507), it is a bright X-ray source (F(2-10 keV) ≃ 10-11 erg cm-2 s-1), due to gravitational lensing by an intervening galaxy at z=0.89. Previ…
A dichotomy in the orientation of dust and radio jets in nearby low-power radio galaxies
de Zeeuw, P. T.; Verdoes Kleijn, G. A.
We examine the properties of central dust in nearby quiescent and active early-type galaxies. The active galaxies are low-power radio galaxies with Fanaroff & Riley type I or I/II radio jets. We focus on (a) the comparison of the dust distributions in the active and quiescent galaxy samples; and (b) the relation between the radio jet and dust …
Accurate and approximate calculations of Raman scattering in the atmosphere of Neptune
Sromovsky, L. A.
Raman scattering by H 2 in Neptune's atmosphere has significant effects on its reflectivity for λ<0.5 µm, producing baseline decreases of ∼20% in a clear atmosphere and ∼10% in a hazy atmosphere. However, few accurate Raman calculations are carried out because of their complexity and computational costs. Here we present the fir…
Hubble Space Telescope Advanced Camera for Surveys Observations of the z = 6.42 Quasar SDSS J1148+5251: A Leak in the Gunn-Peterson Trough
White, Richard L.; Strauss, Michael A.; Fan, Xiaohui +1 more
The Hubble Space Telescope Advanced Camera for Surveys has been used to obtain a narrowband image of the weak emission peak seen at λ=7205 Å in the Gunn-Peterson Lyβ absorption trough of the highest redshift quasar, SDSS J1148+5251. The emission looks perfectly pointlike; there is no evidence for the intervening galaxy that we previously suggested…
High-Spatial-Resolution Imaging Combining High-Order Adaptive Optics, Frame Selection, and Speckle Masking Reconstruction
Xu, Yan; Cao, Wenda; Yang, Guo +5 more
We present, for the first time, high-spatial-resolution observations combining high-order adaptive optics (AO), frame selection, and post-facto image correction via speckle masking. The data analysis is based on observations of solar active region NOAA 10486 taken with the Dunn Solar Telescope (DST) at the Sacramento Peak Observatory (SPO) of the …
Titan's stratospheric zonal wind, temperature, and ethane abundance a year prior to Huygens insertion
Sonnabend, G.; Kostiuk, T.; Murakawa, K. +7 more
Saturn's satellite, Titan, may have stratospheric winds up to ~210 m/s, circling Titan in ~1 terrestrial day compared to its 16-day rotation. Theoretical models explaining such super-rotating winds are not well constrained by observations of Titan or a similar slow rotator, Venus. We report measurements taken in December 2003 of zonal wind near Ti…
INTEGRAL observations of six AGN in the Galactic Plane
de Rosa, A.; Fabian, A. C.; Walter, R. +7 more
We present results on approximately one year of INTEGRAL observations of six AGN detected during the regular scans of the Galactic Plane. The sample is composed by five Seyfert 2 objects (MCG 05 23 16, NGC 4945, the Circinus galaxy, NGC 6300, ESO 103 G35) and the radio galaxy Centaurus A. The continuum emission of each of these sources is well rep…