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Properties of X-ray-selected broad absorption-line quasars
Page, M. J.; Seymour, N.; Kennea, J. A. +6 more
Broad absorption-line quasars (commonly termed BALQSOs) contain the most dramatic examples of active galactic nucleus (AGN) driven winds. The high absorbing columns in these winds, ~1024cm-2, ensure that BALQSOs are generally X-ray faint. This high X-ray absorption means that almost all BALQSOs have been discovered through op…
Variable X-Ray Absorption Toward the Gravitationally-Lensed Blazar PKS 1830-211
Garmire, Gordon P.; Mathur, Smita; Dai, Xinyu +2 more
We present X-ray spectral analysis of five Chandra and XMM-Newton observations of the gravitationally-lensed blazar PKS 1830-211 from 2000 to 2004. We show that the X-ray absorption toward PKS 1830-211 is a variable, and the variable absorption is most likely to be intrinsic with amplitudes of ~2 × 1022 30 × 1022 cm-2
HHSMT observations of the Venusian mesospheric temperature, winds, and CO abundance around the MESSENGER flyby
Hartogh, Paul; Jarchow, Christopher; Rengel, Miriam
We present submillimeter observations of 12CO J=3-2 and 2-1, and 13CO J=2-1 lines of the Venusian mesosphere and lower thermosphere with the Heinrich Hertz Submillimeter Telescope (HHSMT) taken around the second MESSENGER flyby of Venus on 5 June 2007. The observations cover a range of Venus solar elongations with different f…
Dynamical study of wide pairs of stars based on data from the WDS catalog
Kiselev, A. A.; Kiyaeva, O. V.; Izmailov, I. S.
Using the method of apparent motion parameters, we have studied the relative motion of the components in 561 pairs of wide ( ρ > 2″) and relatively nearby (Hipparcos parallaxes > 0.01″) visual double stars based on data from the WDS catalog. The minimum masses of the double stars have been calculated at given parallaxes. We have identified 3…
Relationship between FAC at plasma sheet boundary layers and AE index during storms from August to October, 2001
Zhang, T. L.; Dunlop, M. W.; Liu, Z. X. +2 more
IRAS22036+5306: an Al2O3 oxide-dominated post-AGB star
Maldoni, M. M.; Ireland, T. R.; Robinson, G.
Radiative transfer modelling of the Infrared Space Observatory (ISO) spectrum of IRAS22036+5306 has shown that its unusual 11-µm band can be suitably modelled with an alumina-olivine mixture substantially dominated by the former. The results of this work add further credence to recent findings that significant amounts of Al2O…
A Study of the Scale Height of the Thin Galactic Disk in the Solar Neighborhood
Zhu, Zi; Kong, Da-Li
An attempt is made to determine the scale height of the thin Galactic disk in the solar neighborhood using various stellar samples from the accurate astrometric data of the Hipparcos satellite. Using the Tycho color indices and considering the completeness of the samples, several samples were selected from the main sequence and the horizontal bran…
Correcting for background changes in CoRoT exoplanet data
Auvergne, M.; Costa, J. E. S.; Samadi, R. +4 more
Context: The CoRoT satellite is a highly accurate photometer with 2 channels respectively optimised for asteroseismology and exoplanet finding. The design includes an effective straylight rejection system, however residual straylight reaches the detectors.
Aims: We test four different background models in order to apply the best possible backg…
Comparison of High-Resolution TRACE Data to Spectroscopic CDS Data for Temperature Determination
Walsh, R. W.; Noglik, J. B.; Cirtain, J.
In this paper we aim to measure the temperature along a specific coronal loop feature which is located in an active region on the western solar limb. The data are taken from Joint Observing Program 146 and consist of high-cadence TRACE triple-filter images coinciding with sparse raster Coronal Diagnostic Spectrometer (CDS) spectroscopic data. The …
HST NICMOS Observations of Fast Infrared Flickering in the Microquasar GRS 1915+105
Patel, Shannon G.; Remillard, Ronald; Pooley, Guy G. +3 more
We report infrared observations of the microquasar GRS 1915+105 using the NICMOS instrument of the Hubble Space Telescope during nine visits in 2003 April-June. During epochs of high X-ray/radio activity near the beginning and end of this period, we find that the 1.87 µm infrared flux is generally low (~2 mJy) and relatively steady. However,…