Search Publications
The ACS Virgo Cluster Survey. II. Data Reduction Procedures
Jordán, Andrés; Tonry, John L.; Côté, Patrick +7 more
The ACS Virgo Cluster Survey is a large program to carry out multicolor imaging of 100 early-type members of the Virgo Cluster using the Advanced Camera for Surveys (ACS) on the Hubble Space Telescope. Deep F475W and F850LP images (~SDSS g and z) are being used to study the central regions of the program galaxies, their globular cluster systems, a…
Coronal Mass Ejection of 15 May 2001: II. Coupling of the Cme Acceleration and the Flare Energy Release
Maričić, D.; Vršnak, B.; Stanger, A. L. +1 more
We analyze the relationship between the dynamics of the coronal mass ejection (CME) of 15 May 2001 and the energy release in the associated flare. The flare took place behind the east limb and was disclosed by a growing system of hot soft X-ray (SXR) loops that appeared from behind the limb around the onset of the rapid acceleration of the CME. Th…
Mapping the inner regions of MCG-6-30-15 with XMM-Newton
Cappi, M.; Ponti, G.; Dadina, M. +1 more
Timing analysis of a ∼95 ks long XMM-Newton observation of the Seyfert 1 galaxy MCG-6-30-15 is presented. Model-independent tools have been used with the intent of resolving the different components that produce the observed flux and spectral variations down to timescales as short as ∼300 s. We find that the fractional variability is possibly due …
X-Ray Sources and Their Optical Counterparts in the Globular Cluster M4
Anderson, Scott F.; Kaspi, Victoria M.; Verbunt, Frank +7 more
We report on the Chandra X-Ray Observatory ACIS-S3 imaging observation of the Galactic globular cluster M4 (NGC 6121). We detect 12 X-ray sources inside the core and 19 more within the cluster half-mass radius. The limiting luminosity of this observation is LX~1029 ergs s-1 for sources associated with the cluster, …
Solar and Heliospheric Phenomena in October-November 2003: Causes and Effects
Petrukovich, A. A.; Zelenyi, L. M.; Yermolaev, Yu. I. +72 more
We present new observational data on the phenomena of extremely high activity on the Sun and in the heliosphere that took place in October-November 2003. A large variety of solar and heliospheric parameters give evidence that the interval under consideration is unique over the entire observation time. Based on these data, comparing them with simil…
The Solar Neighborhood. IX. Hubble Space Telescope Detections of Companions to Five M and L Dwarfs within 10 Parsecs of the Sun
Illingworth, Garth D.; Nelan, Edmund P.; Ardila, David R. +10 more
We report the detections of low-mass companions to five M and L dwarfs within 10 pc of the Sun using the Hubble Space Telescope (HST) Near-Infrared Camera and Multi-Object Spectrometer (NICMOS). Follow-up observations using the HST Advanced Camera for Surveys (ACS) and Fine Guidance Sensor 1r (FGS1r) confirm our NICMOS discoveries of companions to…
XMM-Newton observation of Kepler's supernova remnant
Ballet, J.; Decourchelle, A.; Hughes, J. P. +4 more
We present the first results coming from the observation of Kepler's supernova remnant obtained with the EPIC instruments on board the XMM-Newton satellite. We focus on the images and radial profiles of the emission lines (Si K, Fe L, Fe K) and of the high energy continuum. Chiefly, the Fe L and Si K emission-line images are generally consistent w…
ISAAC/VLT observations of a lensed galaxy at z = 10.0
Kneib, J. -P.; Schaerer, D.; Pelló, R. +2 more
We report the first likely spectroscopic confirmation of a z∼ 10.0 galaxy from our ongoing search for distant galaxies with ISAAC/VLT. Galaxy candidates at z ⪆ 7 are selected from ultra-deep JHKs images in the core of gravitational lensing clusters for which deep optical imaging is also available, including HST data. The object reported here, foun…
Cassini UVIS observations of the Io plasma torus. I. Initial results
Steffl, Andrew J.; Stewart, A. Ian F.; Bagenal, Fran
During the Cassini spacecraft's flyby of Jupiter (October, 2000-March, 2001), the Ultraviolet Imaging Spectrograph (UVIS) produced an extensive dataset consisting of 3349 spectrally dispersed images of the Io plasma torus. Here we present an example of the raw data and representative EUV spectra (561-1181 Å) of the torus, obtained on October 1, 20…
The Off-Nuclear Starbursts in NGC 4038/4039 (The Antennae Galaxies)
Surace, J. A.; Fazio, G. G.; Huang, J. -S. +7 more
Imaging of the Antennae galaxies (NGC 4038/4039) with the Infrared Array Camera (IRAC) aboard the Spitzer Space Telescope reveals large concentrations of star-forming activity away from both nuclei of the two merging galaxies. These images confirm earlier findings based on Infrared Space Observatory (ISO) data with lower angular resolution. The sh…