Search Publications
Washington CCD Photometry of the Globular Cluster System of the Giant Elliptical Galaxy M60 in Virgo
Lee, Myung Gyoon; Hwang, Ho Seong; Geisler, Doug +3 more
We present a photometric study of the GCs in the giant elliptical galaxy M60 in the Virgo Cluster, based on deep, relatively wide field Washington CT1 CCD images. The CMD reveals a significant population of GCs in M60 and a large number of young luminous clusters in NGC 4647, a small companion spiral northwest of M60. The color distribu…
CME Earthward Direction as an Important Geoeffectiveness Indicator
Cho, K. -S.; Kim, K. -H.; Moon, Y. -J. +7 more
Frontside halo coronal mass ejections (CMEs) are generally considered as potential candidates for producing geomagnetic storms, but there was no definite way to predict whether they will hit the Earth or not. Recently Moon et al. suggested that the degree of CME asymmetries, as defined by the ratio of the shortest to the longest distances of the C…
The Solar Wind Power from Magnetic Flux
McComas, D. J.; Schwadron, N. A.
Observations of the fast, high-latitude solar wind throughout Ulysses' three orbits show that solar wind power correlates remarkably well with the Sun's total open magnetic flux. These observations support a recent model of the solar wind energy and particle sources, where magnetic flux emergence naturally leads to an energy flux proportional to t…
Hyperdiffusion as a Mechanism for Solar Coronal Heating
Cranmer, S. R.; van Ballegooijen, A. A.
A theory for the heating of coronal magnetic flux ropes is developed. The dissipated magnetic energy has two distinct contributions: (1) energy injected into the corona as a result of granule-scale, random footpoint motions and (2) energy from the large-scale, nonpotential magnetic field of the flux rope. The second type of dissipation can be desc…
A New Red Giant-based Distance Modulus of 13.3 Mpc to the Antennae Galaxies and Its Consequences
Rich, R. Michael; Saviane, Ivo; Da Costa, Gary S. +2 more
The Antennae galaxies are the closest example of an ongoing major galaxy merger and, as such, represent a unique laboratory for furthering the understanding of the formation of exotic objects (e.g., tidal dwarf galaxies, ultraluminous X-ray sources, super stellar clusters). In a previous paper HST WFPC2 observations were used to demonstrate that t…
Molecular Gas in the z = 1.2 Ultraluminous Merger GOODS J123634.53+621241.3
Dickinson, Mark; Chary, Ranga-Ram; Pope, Alexandra +14 more
We report the detection of CO(2→1) emission from the z = 1.2 ultraluminous infrared galaxy (ULIRG) GOODS J123634.53+621241.3 (also known as the submillimeter galaxy GN 26). These observations represent the first discovery of high-redshift CO emission using the new Combined Array for Research in Millimeter-Wave Astronomy (CARMA). Of all high-redshi…
Proto-Planetary Nebulae as Explosions: Bullets versus Jets and Nebular Shaping
Frank, Adam; Balick, Bruce; Blackman, Eric G. +3 more
Many proto-planetary nebulae (PPNs) appear as narrow collimated structures sometimes showing multiple, roughly aligned lobes. In addition, many PPN flows have been shown to have short acceleration times. In this paper we explore whether jet or "bullet" (a massive clump) models fit the observations of individual collimated lobes adequately by compa…
The Spectral Lag of GRB 060505: A Likely Member of the Long-Duration Class
McGlynn, S.; McBreen, S.; Foley, S. +7 more
Two long γ-ray bursts, GRB 060505 and GRB 060614, occurred in nearby galaxies at redshifts of 0.089 and 0.125, respectively. Due to their proximity and durations, deep follow-up campaigns to search for supernovae (SNe) were initiated. However, none were found in either case, to limits more than 2 orders of magnitude fainter than the prototypical G…
Submillimeter Structure of the Disk of the Butterfly Star
Stapelfeldt, K. R.; Wolf, S.; Beuther, H. +2 more
We present a spatially resolved 894 µm map of the circumstellar disk of the Butterfly Star in Taurus (IRAS 04302+2247), obtained with the Submillimeter Array (SMA). The predicted and observed radial brightness profiles agree well in the outer disk region but differ in the inner region with an outer radius of ~80-120 AU. In particular, we fin…
Unveiling the Important Role of Groups in the Evolution of Massive Galaxies: Insights from an Infrared Passive Sequence at Intermediate Redshift
Wilman, D. J.; Mulchaey, J. S.; Balogh, M. L. +6 more
The most massive galaxies in the universe are also the oldest. To overturn this apparent contradiction with hierarchical growth models we focus on the group-scale halos that host most of these galaxies. Our z ~ 0.4 group sample is selected in redshift space from the CNOC2 redshift survey. A stellar mass-selected M*gtrsim 2 × 1010