Search Publications
Tomographic Separation of Composite Spectra. XI. The Physical Properties of the Massive Close Binary HD 100213 (TU Muscae)
Gies, Douglas R.; Penny, Laura R.; Ouzts, Cynthia
We present the results of a Doppler tomographic reconstruction of the UV spectra of the double-lined, O binary HD 100213 based on observations made with the International Ultraviolet Explorer (IUE). We used cross-correlation methods to obtain radial velocities, confirm the orbital elements, estimate the UV flux ratio, and determine projected rotat…
Observations of the Prompt Gamma-Ray Emission of GRB 070125
Yamaoka, Kazutaka; Hong, Soojing; Kodaka, Natsuki +17 more
The long, bright gamma-ray burst GRB 070125 was localized by the Interplanetary Network. We present light curves of the prompt gamma-ray emission as observed by Konus-Wind, RHESSI, Suzaku WAM, and Swift BAT. We detail the results of joint spectral fits with Konus and RHESSI data. The burst shows moderate hard-to-soft evolution in its multipeaked e…
Detection of Dense Molecular Gas in Interarm Spurs in M51
Koda, Jin; Scoville, Nicholas Z.; Sheth, Kartik +3 more
Spiral arm spurs are prominent features that have been observed in extinction and 8 µm emission in nearby galaxies. In order to understand their molecular gas properties, we used the Owens Valley Radio Observatory (OVRO) to map the CO(1-0) emission in three spurs emanating from the inner northwestern spiral arm of M51. We report CO detection…
f-Mode Interactions with Thin Flux Tubes: The Scattering Matrix
Birch, A. C.; Hanasoge, S. M.; Gizon, L. +1 more
We calculate the scattering effects associated with the interaction of a surface gravity or f-mode with a thin magnetic flux tube embedded in a realistically stratified medium. We find that the dominant scattered wave is an f-mode with amplitude and phase of 1.17% and around 50° relative to the incident wave, compared to the values of 0.13% and 40…
A Pair of Leading Spiral Arms in a Luminous Infrared Galaxy?
Mattila, Seppo; Väisänen, Petri; Ryder, Stuart +1 more
Leading spiral arms are a rare phenomenon. We present here one of the very few convincing candidates of spiral arms opening counterintuitively in the same direction as the galaxy disk is rotating. This detection in the luminous IR galaxy (LIRG) IRAS 18293-3413 is based on near-infrared (NIR) adaptive optics imaging with the Very Large Telescope an…
The Plasma Structure of the Southwestern Region of the Cygnus Loop with the XMM-Newton Observatory
Katsuda, Satoru; Uchida, Hiroyuki; Tsunemi, Hiroshi +1 more
We observed the southwestern region of the Cygnus Loop in two pointings with XMM-Newton. The region observed is called the "blow-out" region, which is extended further in the south. The origin of the "blow out" is not well understood, but it is suggested that there is another supernova remnant here in radio observation. To investigate in detail th…
Parallel Motions of Coronal Hard X-Ray Source and Hα Ribbons
Gary, Dale E.; Lee, Jeongwoo
During solar flares Hα ribbons form and often move away from the local magnetic polarity inversion line (PIL). While the motion perpendicular to the PIL has been taken as evidence for coronal magnetic reconnection in the so-called CSHKP standard model, the other velocity component parallel to the PIL is much less adopted as a property of the magne…
Photochemical Enrichment of Deuterium in Titan's Atmosphere: New Insights from Cassini-Huygens
Mousis, Olivier; Lunine, Jonathan I.; Vuitton, Véronique +2 more
Cassini-Huygens data are used to reexamine the potential sources of the D/H enhancement over solar, measured in methane, in Titan's atmosphere. Assuming that the system is closed with respect to carbon, the use of constraints from the Huygens probe for the determination of the current mass of atmospheric methane and the most up-to-date determinati…
Radio Continuum Jet in NGC 7479
Laine, Seppo; Beck, Rainer
The barred galaxy NGC 7479 hosts a remarkable jetlike radio continuum feature: bright, 12 kpc long in projection, and hosting an aligned magnetic field. The degree of polarization is 6%-8% along the jet and remarkably constant, which is consistent with helical field models. The radio brightness of the jet suggests strong interaction with the ISM a…
X-Ray Sources in the Star-Forming Galaxies NGC 4194 and NGC 7541
Kaaret, Philip; Alonso-Herrero, Almudena
We examine the X-ray point-source population and 2-10 keV luminosity for two galaxies with high star formation rates (SFRs), NGC 4194 and NGC 7541. The X-ray point-source luminosity function (XLF) for these two galaxies is consistent with the XLF found by Grimm et al. for a sample of star-forming galaxies. Combining our results with a sample of ga…