Search Publications
A High-Resolution Mosaic of Molecular Gas in Stephan's Quintet
Petitpas, Glen R.; Taylor, Christopher L.
We present high-resolution 12CO J=1-0 observations of the molecular gas in the Hickson compact group Stephan's Quintet (HCG 92). Our observations consist of multiple pointings and mosaics covering all the regions where CO and star formation have been detected. Within the 100" field of view centered on the easternmost tidal tail, we dete…
Cluster Populations in Abell 2125 and 2218
Schombert, James; Rakos, Karl
We combine new narrowband photometry with archival Wide Field Planetary Camera 2 (WFPC2) data for A2218 (z=0.18) and A2125 (z=0.25), two clusters with intermediate redshifts but very different cluster properties, in order to examine the evolution of galaxy populations. A2218 is a dense, elliptical-rich cluster (Bautz-Morgan type II) similar to the…
Double Star project - master science operations plan
Liu, Z.; Shen, C.
For Double Star Project (DSP) exploration, the scientific operations are very important and essential for achieving its scientific objectives. Two years before the launch of the DSP satellites (TC-1 and TC-2) and during the mission operating phase, the long-term and short-term master science operations plans (MSOP) were produced. MSOP is composed …
Simultaneous Double Star and Cluster FTEs observations on the dawnside flank of the magnetosphere
Balogh, A.; Fazakerley, A. N.; Owen, C. J. +8 more
We present Cluster and Double Star-1 (TC-1) observations from a close magnetic conjunction on 8 May 2004. The five spacecraft were on the dawnside flank of the magnetosphere, with TC-1 located near the equatorial plane and Cluster at higher geographic latitudes in the Southern Hemisphere. TC-1, at its apogee, skimmed the magnetopause for almost 8h…
A Potential Supernova Remnant-X-Ray Binary Association in M31
Williams, Benjamin F.; Kong, Albert K. H.; Kolb, U. +3 more
The well-studied X-ray/optical/radio supernova remnant (SNR) DDB 1-15 (CXOM31 J004327.8+411829; r3-63) in M31 has been investigated with archival XMM-Newton and Chandra observations. The timing data from XMM-Newton reveal a power density spectrum (PDS) characteristic of accreting compact objects in X-ray binaries (XRBs). The PDS shows features typ…
Kinematics of Vega-like stars: Lifetimes and temporal evolution of circumstellar dust disks
Manoj, P.; Bhatt, H. C.
We have used the velocity dispersion as an age indicator to constrain the ages of a large sample of main sequence Vega-like stars in order to study the lifetimes and temporal evolution of the dust disks around them. We use Hipparcos measurements to compute stellar velocities in the sky plane. The velocity dispersion of Vega-like stars is found to …
Centre-to-limb variation of photospheric facular radiance and image resolution
Domingo, Vicente; Ortiz, Ada; Sanahuja, Blai +1 more
We study the effect of the angular resolution on the determination of the angular properties of the facular radiance. We analyze photospheric intensity in the continuum, around the Ni 676.8 nm line, and longitudinal magnetic field along the line of sight, measured by the MDI instrument aboard SOHO with two spatial resolutions, 4″ and 1.2″ (2″ and …
Simulations of high-latitude spots on Jupiter: Constraints on vortex strength and the deep wind
Morales-Juberias, Raul; Dowling, Timothy E.
We combine high-resolution observations of the dynamical behavior of small vortices (diameters ⩽5000 km) located at latitude 60°N on Jupiter with forward modeling, using the EPIC atmospheric model, to address two open questions: the dependence of the zonal winds with depth, and the strength of vortices that are too small to apply cloud tracking to…
Study of the Solar Cycle Dependence of Low-Degree p-Modes with Michelson Doppler Imager and VIRGO
Kosovichev, A. G.; Toutain, T.
Studying variations of observational properties of low-degree solar acoustic p-modes (radial, dipole, and quadrupole) with the activity cycle is important for understanding potential effects of the cycle in the deep interior, obtaining more accurate inversions for the sound speed and rotation, and also for estimating prospective investigation of s…
One-up on L1: Can X-rays provide longer advanced warning of solar wind flux enhancements than upstream monitors?
Kuntz, K. D.; Snowden, S. L.; Collier, M. R. +1 more
Observations of strong solar wind proton flux correlations with ROSAT X-ray rates along with high spectral resolution Chandra observations of X-rays from the dark Moon show that soft X-ray emission mirrors the behavior of the solar wind. In this paper, based on an analysis of an X-ray event observed by XMM-Newton resulting from charge exchange of …