Search Publications
The Kinematics of Morphologically Selected z~2 Galaxies in the GOODS-North Field
Pettini, Max; Erb, Dawn K.; Shapley, Alice E. +2 more
We present near-IR spectra of Hα emission from 13 galaxies at z~2 in the Great Observatories Origins Deep Survey-North (GOODS-N) field. The galaxies were selected primarily because they appear to have elongated morphologies, and slits were aligned with the major axes (as determined from the rest-frame UV emission) of 11 of the 13. If the galaxies …
Wavelet Phase Coherence Analysis: Application to a Quiet-Sun Magnetic Element
Judge, Philip G.; Lites, Bruce W.; Mathioudakis, Mihalis +3 more
A new application of wavelet analysis is presented that utilizes the inherent phase information residing within the complex Morlet transform. The technique is applied to a weak solar magnetic network region, and the temporal variation of phase difference between TRACE 1700 Å and SOHO/SUMER C II 1037 Å intensities is shown. We present, for the firs…
Kinematics and Ultraviolet to Infrared Morphology of the Inner Homunculus of η Carinae
Corcoran, Michael F.; Walborn, Nolan R.; Hamann, Fred +12 more
We present the first ultraviolet and optical images of η Car and its circumstellar Homunculus nebula, obtained with the Advanced Camera for Surveys/High Resolution Camera (ACS/HRC) on board the Hubble Space Telescope (HST). Compared to those at visual wavelengths, UV images reveal excess emission 0.1"-0.6" from the central source along the minor a…
A Resolved Debris Disk around the G2 V Star HD 107146
Ford, H. C.; Williams, J. P.; Illingworth, G. D. +6 more
We present resolved scattered-light images of the debris disk around HD 107146, a G2 star 28.5 pc from the Sun. This is the first debris disk to be resolved in scattered light around a solar-type star. We observed it with the Hubble Space Telescope/Advanced Camera for Surveys coronagraph, using a 1.8" occulting spot and the F606W (broad V) and F81…
The N Enrichment and Supernova Ejection of the Runaway Microquasar LS 5039
Kaper, L.; Gies, D. R.; Huang, W. +3 more
We present an investigation of new optical and ultraviolet spectra of the mass donor star in the massive X-ray binary LS 5039. The optical band spectral line strengths indicate that the atmosphere is N-rich and C-poor, and we classify the stellar spectrum as type ON6.5 V((f)). The N-strong and C-weak pattern is also found in the stellar wind P Cyg…
HETE Observations of the Gamma-Ray Burst GRB 030329: Evidence for an Underlying Soft X-Ray Component
Sakamoto, T.; Hurley, K.; Boer, M. +30 more
An exceptionally intense gamma-ray burst, GRB 030329, was detected and localized by the instruments on board the High Energy Transient Explorer satellite (HETE) at 11:37:14 UT on 2003 March 29. The burst consisted of two ~10 s pulses of roughly equal brightness and an X-ray tail lasting more than 100 s. The energy fluence in the 30-400 keV energy …
Thermal and Nonthermal X-Rays from the Large Magellanic Cloud Superbubble 30 Doradus C
Ueno, Masaru; Koyama, Katsuji; Nakajima, Hiroshi +1 more
We report on the discovery of thermal and nonthermal X-rays from the shells of the superbubble (SB) 30 Dor C in the LMC. The X-ray morphology is a nearly circular shell with a radius of ~40 pc, which is bright on the northern and western sides. The spectra of the shells differ from region to region. The southern shell shows clear emission lines an…
Hypernovae/Gamma-Ray Bursts in the Galactic Center as Possible Sources of Galactic Positrons
Schanne, S.; Cordier, B.; Paul, J. +1 more
The observation of a strong and extended positron-electron line annihilation emission in the central regions of the Galaxy by the SPectrometer on the International Gamma-Ray Astrophysical Laboratory (INTEGRAL/SPI), consistent with the Galactic bulge geometry and without any counterpart in the gamma-ray range, neither at high energy nor in the 1809…
The Ultraluminous X-Ray Source NGC 1313 X-2 (MS 0317.7-6647) and Its Environment
Kaaret, Philip; Turolla, Roberto; Zampieri, Luca +5 more
We present new optical and Chandra observations of the field containing the ultraluminous X-ray source NGC 1313 X-2. On an ESO 3.6 m image, the Chandra error box embraces an R=21.6 pointlike object and excludes a previously proposed optical counterpart. The resulting X-ray/optical flux ratio of NGC 1313 X-2 is ~500. The value of fX/f
Evidence of Rapid Flux Emergence Associated with the M8.7 Flare on 2002 July 26
Qiu, Jiong; Jing, Ju; Wang, Haimin +5 more
In this paper, we present a detailed study of the M8.7 flare that occurred on 2002 July 26 using data from the Big Bear Solar Observatory (BBSO), Ramaty High Energy Solar Spectroscopic Imager (RHESSI), the Transition Region and Coronal Explorer (TRACE), and the Solar and Heliospheric Observatory (SOHO). This flare has interesting properties simila…