Search Publications
Detailed Fit of "Critical Balance" Theory to Solar Wind Turbulence Measurements
Wicks, Robert T.; Horbury, Timothy S.; Forman, Miriam A.
We derive the reduced spectrum of turbulent magnetic fluctuations at different frequencies f which would be observed by a single spacecraft in the solar wind when the magnetic field was at an angle θ B to the solar wind flow, if the wavevector spectrum in the solar wind frame were in anisotropic "critical balance" (CB) as proposed by Go…
GALEX Far-ultraviolet Color Selection of UV-bright High-redshift Quasars
Worseck, Gábor; Prochaska, J. Xavier
We study the small population of high-redshift (z em>2.7) quasars detected by the Galaxy Evolution Explorer(GALEX), whose far-UV emission is not extinguished by intervening H I Lyman limit systems. These quasars are of particular importance to detect intergalactic He II absorption along their sight lines. We correlate almost all veri…
Temporal variations of Titan’s middle-atmospheric temperatures from 2004 to 2009 observed by Cassini/CIRS
Nixon, Conor A.; Achterberg, Richard K.; Michael Flasar, F. +2 more
We use five and one-half years of limb- and nadir-viewing temperature mapping observations by the Composite Infrared Radiometer-Spectrometer (CIRS) on the Cassini Saturn orbiter, taken between July 2004 and December 2009 ( LS from 293° to 4°; northern mid-winter to just after northern spring equinox), to monitor temperature changes in t…
Understanding reverberation lags in 1H0707-495
Fabian, A. C.; Uttley, P.; Zoghbi, A.
The first reverberation lag from the vicinity of a supermassive black hole was recently detected in the NLS1 galaxy 1H0707-495. We interpreted the lag as due to reflection from matter close to the black hole, within a few gravitational radii of the event horizon (an inner reflector). It has since been claimed by Miller et al. that the lag can be p…
Planck early results. V. The Low Frequency Instrument data processing
Baccigalupi, C.; Banday, A. J.; Barreiro, R. B. +146 more
We describe the processing of data from the Low Frequency Instrument (LFI) used in production of the Planck Early Release Compact Source Catalogue (ERCSC). In particular, we discuss the steps involved in reducing the data from telemetry packets to cleaned, calibrated, time-ordered data (TOD) and frequency maps. Data are continuously calibrated usi…
Small-Scale Flux Emergence Observed Using Hinode/SOT
Parnell, C. E.; Thornton, L. M.
The aim of this paper is to determine the flux emergence rate due to small-scale magnetic features in the quiet Sun using high-resolution Hinode SOT NFI data. Small-scale magnetic features are identified in the data using two different feature identification methods (clumping and downhill); then three methods are applied to detect flux emergence e…
Black hole accretion and host galaxies of obscured quasars in XMM-COSMOS
Kneib, J. -P.; Aussel, H.; Le Floc'h, E. +61 more
Aims: We explore the connection between black hole growth at the center of obscured quasars selected from the XMM-COSMOS survey and the physical properties of their host galaxies. We study a bolometric regime ( ⟨ Lbol ⟩ = 8 × 1045 erg s-1) where several theoretical models invoke major galaxy mergers as the mai…
The shocking transit of WASP-12b: modelling the observed early ingress in the near-ultraviolet
Vidotto, A. A.; Fossati, L.; Helling, Ch. +4 more
Near-ultraviolet (near-UV) observations of WASP-12b have revealed an early ingress compared to the optical transit light curve. This has been interpreted as due to the presence of a magnetospheric bow shock which forms when the relative velocity of the planetary and stellar material is supersonic. We aim to reproduce this observed early ingress by…
Discovery of Two Millisecond Pulsars in Fermi Sources with the Nançay Radio Telescope
Abdo, A. A.; Ballet, J.; Camilo, F. +29 more
We report the discovery of two millisecond pulsars in a search for radio pulsations at the positions of Fermi-Large Area Telescope sources with no previously known counterparts, using the Nançay Radio Telescope. The two millisecond pulsars, PSRs J2017+0603 and J2302+4442, have rotational periods of 2.896 and 5.192 ms and are both in binary systems…
Multiphase Gas in Galaxy Halos: The O VI Lyman-limit System toward J1009+0713
Sembach, K. R.; Prochaska, J. X.; Tripp, T. M. +6 more
We have serendipitously detected a strong O VI-bearing Lyman-limit system (LLS) at z abs = 0.3558 toward the quasi-stellar object (QSO) J1009+0713 (z em = 0.456) in our survey of low-redshift galaxy halos with the Hubble Space Telescope's (HST) Cosmic Origins Spectrograph. Its total rest-frame equivalent width of Wr