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A 7 mm line survey of the shocked and disrupted molecular gas towards the W28 field TeV gamma-ray sources
Rowell, G.; Fukui, Y.; Burton, M. G. +4 more
We present 7 mm Mopra observations of the dense molecular gas towards the W28 supernova remnant (SNR) field, following a previous 12 mm line survey of this region. These observations take advantage of the 7 mm beam size to probe the dense and disrupted gas in the region at ∼1 arcmin scales. Our observations are focused towards the north-eastern (N…
A Treasury Study of Star-forming Regions in the Local Group. I. HST Photometry of Young Populations in Six Dwarf Galaxies
Massey, Philip; Bianchi, Luciana; Olsen, K. A. G. +2 more
We present a comprehensive study of young stellar populations in six dwarf galaxies in or near the Local Group: Phoenix, Pegasus, Sextans A, Sextans B, WLM, and NGC 6822. Their star-forming regions, selected from GALEX wide-field far-UV imaging, were imaged (at sub-pc resolution) with the WFPC2 camera on board the Hubble Space Telescope (HST) in s…
Supernova remnants and candidates detected in the XMM-Newton M 31 large survey
Stiele, H.; Pietsch, W.; Haberl, F. +5 more
Context. We present the analysis of supernova remnants (SNRs) and candidates in M 31 identified in the XMM-Newton large programme survey of M 31. Supernova remnants are among the brightest X-ray sources in a galaxy. They are good indicators of the recent star-formation activities of galaxies and the interstellar environment in which they evolve. <…
Detection of sub-kilometer craters in high resolution planetary images using shape and texture features
Stepinski, Tomasz F.; Bandeira, Lourenço; Ding, Wei
Counting craters is a paramount tool of planetary analysis because it provides relative dating of planetary surfaces. Dating surfaces with high spatial resolution requires counting a very large number of small, sub-kilometer size craters. Exhaustive manual surveys of such craters over extensive regions are impractical, sparking interest in designi…
Exploring the Diversity of Groups at 0.1 < z < 0.8 with X-Ray and Optically Selected Samples
Mulchaey, John S.; Connelly, J. L.; Balogh, Michael L. +8 more
We present the global group properties of two samples of galaxy groups containing 39 high-quality X-ray-selected systems and 38 optically (spectroscopically) selected systems in coincident spatial regions at 0.12 < z < 0.79. The total mass range of the combined sample is ~(1012-5) × 1014 M ⊙. Only nine optica…
Identification of Ambient Molecular Clouds Associated with Galactic Supernova Remnant IC 443
Yun, Min S.; Koo, Bon-Chul; Lee, Jae-Joon +3 more
The Galactic supernova remnant (SNR) IC 443 is one of the most studied core-collapse SNRs for its interaction with molecular clouds. However, the ambient molecular clouds with which IC 443 is interacting have not been thoroughly studied and remain poorly understood. Using the Five College Radio Astronomy Observatory 14 m telescope, we obtained ful…
Observational Aspects of Particle Acceleration in Large Solar Flares
Krucker, Säm; Raymond, John C.; Lin, Robert P. +1 more
Solar flares efficiently accelerate electrons to several tens of MeV and ions to 10 GeV. The acceleration is usually thought to be associated with magnetic reconnection occurring high in the corona, though a shock produced by the Coronal Mass Ejection (CME) associated with a flare can also accelerate particles. Diagnostic information comes from em…
On the origin of high-energy particles in the cusp diamagnetic cavity
Kronberg, E.; Daly, P.; Adamson, E. +2 more
We have analyzed Cluster magnetic field and plasma data during a high-altitude cusp crossing in 2003. The Cluster separation was ∼5000km and provided unique measurements of high energy particle properties both inside the DiaMagnetic Cavity (DMC) and surrounding magnetosheath. Most of the high energy electrons and protons had pitch angles of ∼90° i…
A peculiar class of debris disks from Herschel/DUNES. A steep fall off in the far infrared
Krivov, A. V.; Eiroa, C.; Löhne, T. +21 more
Context. The existence of debris disks around old main sequence stars is usually explained by continuous replenishment of small dust grains through collisions from a reservoir of larger objects.
Aims: We present photometric data of debris disks around HIP 103389 (HD 199260), HIP 107350 (HN Peg, HD 206860), and HIP 114948 (HD 219482), obtained…
The Occurrence and Speed of CMEs Related to Two Characteristic Evolution Patterns of Helicity Injection in Their Solar Source Regions
Wang, Haimin; Chae, Jongchul; Liu, Rui +4 more
Long-term (a few days) variation of magnetic helicity injection was calculated for 28 solar active regions that produced 47 coronal mass ejections (CMEs) to find its relationship to the CME occurrence and speed using SOHO/MDI line-of-sight magnetograms. As a result, we found that the 47 CMEs can be categorized into two different groups by two char…