Search Publications
The X-Ray Globular Cluster Population in NGC 1399
Angelini, Lorella; Loewenstein, Michael; Mushotzky, Richard F.
We report on the Chandra observations of the elliptical galaxy NGC 1399, concentrating on the X-ray sources identified with globular clusters (GCs). A large fraction of the 2-10 keV X-ray emission in the 8'×8' Chandra image is resolved into point sources with luminosities >=5×1037 ergs s-1. These sour…
The Formation of a Prominence in Active Region NOAA 8668. I. SOHO/MDI Observations of Magnetic Field Evolution
Qiu, Jiong; Wang, Haimin; Chae, Jongchul +3 more
We have studied the evolution of the photospheric magnetic field in active region NOAA 8668 for 3 days while the formation of a reverse S-shaped filament proceeded. From a set of full-disk line-of-sight magnetograms taken by the Michelson Doppler Imager (MDI) on board the Solar and Heliospheric Observatory (SOHO), we have found a large canceling m…
A Multiwavelength Study of the Young Star Clusters and Interstellar Medium in the Antennae Galaxies
Whitmore, Bradley C.; Fall, S. Michael; Zhang, Qing
We report on a multiwavelength study of the relationship between young star clusters in the Antennae galaxies (NGC 4038/9) and their interstellar environment, with the goal of understanding the formation and feedback effects of star clusters in merging galaxies. This is possible for the first time because various new observations (from X-rays to r…
Searching for the Physical Drivers of the Eigenvector 1 Correlation Space
Marziani, P.; Zwitter, T.; Sulentic, J. W. +2 more
We recently discussed an Eigenvector 1 (E1) parameter space that provides optimal discrimination between the principal classes of broad-line active galactic nuclei (AGNs). In this paper we begin a search for the most important physical parameters that are likely to govern correlations and data point distribution in E1 space. We focus on the princi…
Are Magnetic Dips Necessary for Prominence Formation?
Klimchuk, J. A.; MacNeice, P. J.; Antiochos, S. K. +2 more
The short answer: No.
Jet- and Wind-driven Ionized Outflows in the Superbubble and Star-forming Disk of NGC 3079
Filippenko, Alexei V.; Veilleux, Sylvain; Bland-Hawthorn, Joss +1 more
Hubble Space Telescope WFPC2 images are presented that span the inner ~19 kpc diameter of the edge-on galaxy NGC 3079; they are combined with optical, emission-line imaging spectrophotometry and VLA images of radio polarization vectors and rotation measures. Ionized gas filaments within 9 kpc diameter project up to 3 kpc above the disk, with the b…
Clustering Segregation with Ultraviolet Luminosity in Lyman Break Galaxies at z~3 and Its Implications
Dickinson, Mark; Giavalisco, Mauro
We report on the clustering properties of Lyman break galaxies (LBGs) at z~3. The correlation length of flux-limited samples of LBGs depends on their rest-frame ultraviolet (UV) luminosity at λ~1700 Å, with fainter galaxies being less strongly clustered in space. We have used three samples with progressively fainter flux limits: two extracted from…
Magnetic Energy Release and Transients in the Solar Flare of 2000 July 14
Kosovichev, A. G.; Zharkova, V. V.
High-resolution observations of a large solar flare on 2000 July 14 (``Bastille Day Flare'') from the Michelson Doppler Imager instrument on the SOHO spacecraft reveal rapid variations of the magnetic field in the lower solar atmosphere during the flare. Some of these variations were irreversible, occurred in the vicinity of magnetic neutral lines…
A Faint Star-forming System Viewed through the Lensing Cluster Abell 2218: First Light at z~=5.6?
Ellis, Richard; Kneib, Jean-Paul; Kuijken, Konrad +1 more
We discuss the physical nature of a remarkably faint pair of Lyα-emitting images discovered close to the giant cD galaxy in the lensing cluster Abell 2218 (z=0.18) during a systematic survey for highly magnified star-forming galaxies beyond z=5. A well-constrained mass model suggests the pair arises via a gravitationally lensed source viewed at hi…
Is the Gas in Cooling Flows Multiphase?
Molendi, Silvano; Pizzolato, Fabio
Employing XMM-Newton EPIC data we perform a detailed comparison between different spectral models to test whether the gas in cooling flows is multiphase or not. Our findings all point in the same direction, namely, that gas in cooling flows does not show the wide distribution of temperatures expected from standard multiphase models. This result ha…