Search Publications
A Precessing Jet in the CH Cyg Symbiotic System
Raymond, John C.; Karovska, Margarita; Carilli, Christopher L. +3 more
Jets have been detected in only a few symbiotic binaries to date, and CH Cyg is one of them. In 2001, a non-relativistic jet was detected in CH Cyg for the first time in X-rays. We carried out coordinated Chandra, Hubble Space Telescope (HST), and VLA observations in 2008 to study the propagation of this jet and its interaction with the circumbina…
Mode Identification of MHD Waves in an Active Region Observed with Hinode/EIS
Hara, H.; Kitagawa, N.; Yokoyama, T. +1 more
In order to better understand the possibility of coronal heating by MHD waves, we analyze Fe XII 195.12Å data observed with the EUV Imaging Spectrometer on board Hinode. We performed a Fourier analysis of EUV intensity and Doppler velocity time series data in the active region corona. Notable intensity and Doppler velocity oscillations were found …
HIFI observations of water in the atmosphere of comet C/2008 Q3 (Garradd)
Blommaert, J. A. D. L.; Küppers, M.; Thomas, N. +42 more
High-resolution far-infrared and sub-millimetre spectroscopy of water lines is an important tool to understand the physical and chemical properties of cometary atmospheres. We present observations of several rotational ortho- and para-water transitions in comet C/2008 Q3 (Garradd) performed with HIFI on Herschel. These observations have provided t…
Empirical modeling of a CIR-driven magnetic storm
Anderson, B. J.; Sitnov, M. I.; Lui, A. T. Y. +4 more
The empirical analysis of structure and evolution of the geomagnetic field and underlying electric currents during the 8-11 March 2008 magnetospheric storm, driven by a corotating interaction region, is presented. It is based on the high-resolution geomagnetic field model TS07D (http://geomag_field.jhuapl.edu/model/) and the low-altitude mapping o…
The source of 3-µm absorption in Jupiter’s clouds: Reanalysis of ISO observations using new NH3 absorption models
Sromovsky, L. A.; Fry, P. M.
A prominent characteristic of jovian near-IR spectra is the widely distributed presence of a strong absorption at wavelengths from about 2.9 µm to 3.1 µm, first noticed in a 3-µm spectrum obtained by the Infrared Space Observatory (ISO) in 1996. While Brooke et al. (Brooke, T.Y., Knacke, R.F., Encrenaz, T., Drossart, P., Crisp, D…
Radio weak gravitational lensing with VLA and MERLIN
Muxlow, T. W. B.; Beswick, R. J.; Hoyle, B. +2 more
We carry out an exploratory weak gravitational lensing analysis on a combined Very Large Array and Multi-Element Radio-Linked Interferometer Network radio data set: a deep (3.3µJybeam-1 rms noise) 1.4GHz image of the Hubble Deep Field-North. We measure the shear estimator distribution at this radio sensitivity for the first time, …
The youngest massive protostars in the Large Magellanic Cloud
van Loon, J. Th.; Okumura, K.; Hony, S. +19 more
We demonstrate the unique capabilities of Herschel to study very young luminous extragalactic young stellar objects (YSOs) by analyzing a central strip of the Large Magellanic Cloud obtained through the HERITAGE science demonstration program. We combine PACS 100 and 160, and SPIRE 250, 350, and 500 µm photometry with 2MASS (1.25-2.17 µ…
The Dynamical State of the Globular Cluster M10 (NGC 6254)
Dalessandro, E.; Trenti, M.; Beccari, G. +3 more
Studying the radial variation of the stellar mass function (MF) in globular clusters (GCs) has proved a valuable tool to explore the collisional dynamics leading to mass segregation and core collapse. Recently, Pasquato et al. (2009) used the mass segregation profile to investigate the presence of an intermediate-mass black hole (IMBH) in NGC 2298…
Investigation of Long-Period Oscillations of Sunspots with Ground-Based (Pulkovo) and SOHO/MDI Data
Solov'ev, A. A.; Efremov, V. I.; Parfinenko, L. D.
We applied special data-processing algorithms to the study of long-period oscillations of the magnetic-field strength and the line-of-sight velocity in sunspots. The oscillations were investigated with two independent groups of data. First, we used an eight-hour-long series of solar spectrograms, obtained with the solar telescope at the Pulkovo Ob…
AEGIS: A Multiwavelength Study of Spitzer Power-law Galaxies
Barmby, P.; Ivison, R. J.; Georgakakis, A. +8 more
This paper analyzes a sample of 489 Spitzer/Infrared Array Camera (IRAC) sources in the Extended Groth Strip (EGS), whose spectral energy distributions fit a red power law (PL) from 3.6 to 8.0 µm. The median redshift for sources with known redshifts is langzrang = 1.6. Though all or nearly all of the sample galaxies are likely to be active g…