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CLASH: Extreme Emission-line Galaxies and Their Implication on Selection of High-redshift Galaxies
Donahue, Megan; Broadhurst, Tom; Frye, Brenda L. +23 more
We utilize the Cluster Lensing And Supernova survey with Hubble observations of 25 clusters to search for extreme emission-line galaxies (EELGs). The selections are carried out in two central bands: F105W (Y 105) and F125W (J 125), as the flux of the central bands could be enhanced by the presence of [O III] λλ4959, 5007 at r…
A Combined Spitzer and Herschel Infrared Study of Gas and Dust in the Circumbinary Disk Orbiting V4046 Sgr
Kastner, Joel H.; Wilner, David; Andrews, Sean +6 more
We present results from a spectroscopic Spitzer and Herschel mid-to-far-infrared study of the circumbinary disk orbiting the evolved (age ∼12-23 Myr) close binary T Tauri system V4046 Sgr. Spitzer InfraRed Spectrograph spectra show emission lines of [Ne ii], H2 S(1), CO2, and HCN, while Herschel Photodetector Array Camera and…
Star Formation Activity in the Long, Filamentary Infrared Dark Cloud G53.2
Koo, Bon-Chul; Kim, Hyun-Jeong; Davis, Christopher J.
We present star formation activity in the infrared dark cloud (IRDC) G53.2, a remarkable IRDC located at Galactic coordinates (l,b)∼ (53\buildrel{\circ}\over{.} 2, 0\buildrel{\circ}\over{.} 0) based on the census of young stellar object (YSO) candidates. IRDC G53.2 was previously identified as several IRDCs in mid-IR images, but it is in fact a lo…
The Cheshire Cat Gravitational Lens: The Formation of a Massive Fossil Group
White, Raymond E., III; Maksym, W. Peter; Dupke, Renato +3 more
The Cheshire Cat is a relatively poor group of galaxies dominated by two luminous elliptical galaxies surrounded by at least four arcs from gravitationally lensed background galaxies that give the system a humorous appearance. Our combined optical/X-ray study of this system reveals that it is experiencing a line of sight merger between two groups …
Evolution and Flare Activity of δ -Sunspots in Cycle 23
Takizawa, K.; Kitai, R.
The emergence and magnetic evolution of solar active regions (ARs) of β γ δ -type, which are known to be highly flare-productive, were studied with SOHO/MDI data in Cycle 23. We selected 31 ARs that can be observed from their birth phase as unbiased samples for our study. From the analysis of the magnetic topology (twist and writhe), we obtained t…
Far-infrared observations of an unbiased sample of gamma-ray burst host galaxies
Ivison, R. J.; Scott, D.; Fritz, J. +19 more
Gamma-ray bursts (GRBs) are the most energetic phenomena in the Universe; believed to result from the collapse and subsequent explosion of massive stars. Even though it has profound consequences for our understanding of their nature and selection biases, little is known about the dust properties of the galaxies hosting GRBs. We present analysis of…
IGR J14488-4008: an X-ray peculiar giant radio galaxy discovered by INTEGRAL
Venturi, T.; Dallacasa, D.; Bird, A. J. +5 more
In this paper, we report the discovery and detailed radio/X-ray analysis of a peculiar giant radio galaxy (GRG) detected by INTEGRAL, IGR J14488-4008. The source has been recently classified as a Seyfert 1.2 galaxy at redshift 0.123; the radio data denote the source to be a type II Fanaroff-Riley radio galaxy, with a linear projected size exceedin…
Mars as a comet: Solar wind interaction on a large scale
Holmstrom, Mats; Wang, Xiao-Dong
Looking at the Mars-solar wind interaction on a larger spatial scale than the near Mars region, the planet can be seen as an ion source interacting with the solar wind, in many ways like a comet, but with a smaller ion source region. Here we study the interaction between Mars and the solar wind using a hybrid model (particle ions and fluid electro…
3D magnetic field configuration of small-scale reconnection events in the solar plasma atmosphere
Shimizu, T.
The outer solar atmosphere, i.e., the corona and the chromosphere, is replete with small energy-release events, which are accompanied by transient brightening and jet-like ejections. These events are considered to be magnetic reconnection events in the solar plasma, and their dynamics have been studied using recent advanced observations from the H…
Morpho-kinematics of the planetary nebula NGC 3242: an analysis beyond its multiple-shell structure
Gómez-Muñoz, M. A.; Vázquez, R.; Ayala, S. +3 more
In this paper we present the results of optical high-resolution imaging and spectroscopy of the complex planetary nebula (PN) NGC 3242. Our study is based on the analysis of the narrow-band Hα λ6563, [O III] λ5007, [N II] λ6584, and [S II] λ6724 Å images, and high-resolution spectroscopy using spectral ranges centred on the Hα λ6564, [N II] λ6583,…