Search Publications
Independent Emission and Absorption Abundances for Planetary Nebulae
Zhang, Yong; Jenkins, Edward B.; Phillips, Mark +4 more
Emission-line abundances have been uncertain for more than a decade due to unexplained discrepancies in the relative intensities of the forbidden lines and weak permitted recombination lines in PNe and H II regions. The observed intensities of forbidden and recombination lines originating from the same parent ion differ from their theoretical valu…
Unveiling the Narrow-Line Seyfert 1 Nature of Markarian 573 Using Near-Infrared Spectroscopy
Pérez García, A. M.; Acosta-Pulido, J. A.; González-Martín, O. +1 more
In this Letter we present clear evidence that Mrk 573 is an obscured narrow-line Seyfert 1 (NLSy1) galaxy and not an archetypal Seyfert 2, as it has been classified until now. Only three galaxies have been proposed as members of this class, prior to this work. Here we report near-infrared spectroscopic data taken with LIRIS on the 4.2 m William He…
V5116 Sagittarii, an Eclipsing Supersoft Postoutburst Nova?
Greiner, J.; Hernanz, M.; Sala, G. +1 more
V5116 Sgr (Nova Sgr 2005 No. 2), discovered on 2005 July 4, was observed with XMM-Newton in 2007 March, 20 months after the optical outburst. The X-ray spectrum shows that the nova had evolved to a pure supersoft X-ray source, with no significant emission at energies above 1 keV. The X-ray light curve shows abrupt decreases and increases of the fl…
A Parameterization Study of the Properties of the X-Ray Dips in the Low-Mass X-Ray Binary X1916-053
Hu, Chin-Ping; Chou, Yi; Chung, Yi-Ying
The ultracompact low-mass X-ray binary X1916-053, which is composed of a neutron star and a semidegenerate white dwarf, exhibits periodic X-ray dips of variable width and depth. We have developed a new method to parameterize this dipping behavior to systematically study its variations. This can help in further understanding binary and accretion di…
High-Velocity Interstellar Bullets in IRAS 05506+2414: A Very Young Protostar
Sahai, Raghvendra; Sánchez Contreras, Carmen; Morris, Mark +2 more
We have made a serendipitous discovery of an enigmatic outflow source, IRAS 05506+2414 (hereafter IRAS 05506), as part of a multiwavelength survey of pre-planetary nebulae (PPNs). The HST optical and near-infrared images show a bright compact central source with a jetlike extension, and a fanlike spray of high-velocity (with radial velocities up t…
The X-Ray-Emitting Components toward l = 111°: The Local Hot Bubble and Beyond
Kuntz, K. D.; Snowden, S. L.
We have obtained an XMM-Newton spectrum of the diffuse X-ray emission toward (l ,b) = (111.14°,1.11°) , a line of sight with a relatively simple distribution of absorbing clouds: >9 × 1019 cm-2 at R > 170 pc, a 6 × 1021 cm-2 molecular cloud at 2.5-3.3 kpc, and a total column of 1.2 × 1022
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…