Search Publications
Warm and Fuzzy: Temperature and Density Analysis of an Fe XV EUV Imaging Spectrometer Loop
Schmelz, J. T.; Pathak, S.; Saar, S. H. +3 more
The Hinode EUV Imaging Spectrometer (EIS) and X-Ray Telescope (XRT) were designed in part to work together. They have the same spatial resolution and cover different but overlapping coronal temperature ranges. These properties make a combined data set ideal for multithermal analysis, where EIS provides the best information on the cooler corona (lo…
Identification of a Population of X-ray-emitting Massive Stars in the Galactic Plane
Drake, Jeremy J.; Chakrabarty, Deepto; Lee, Julia C. +15 more
We present X-ray, infrared, optical, and radio observations of four previously unidentified Galactic plane X-ray sources: AX J163252-4746, AX J184738-0156, AX J144701-5919, and AX J144547-5931. Detection of each source with the Chandra X-ray Observatory has provided sub-arcsecond localizations, which we use to identify bright infrared counterparts…
Suzaku Observations of Three FeLoBAL Quasi-stellar Objects: SDSS J0943+5417, J1352+4239, and J1723+5553
Dai, Xinyu; Leighly, Karen M.; Sivakoff, Gregory R. +2 more
We present Suzaku observations of three iron low-ionization broad absorption line quasars (FeLoBALs). We detect J1723+5553 (3σ) in the observed 2-10 keV band, and constrain its intrinsic N H column density to N H > 6 × 1023 cm-2 by modeling its X-ray hardness ratio. We study the broadband spectral ind…
Anatomy of a Solar Flare: Measurements of the 2006 December 14 X-class Flare with GONG, Hinode, and RHESSI
Zharkova, V. V.; Matthews, S. A.; Zharkov, S.
Some of the most challenging observations to explain in the context of existing flare models are those related to the lower atmosphere and below the solar surface. Such observations, including changes in the photospheric magnetic field and seismic emission, indicate the poorly understood connections between energy release in the corona and its imp…
Extended Hard X-Ray Emission from the Vela Pulsar Wind Nebula
Götz, D.; Ponti, G.; Bouchet, L. +8 more
The nebula powered by the Vela pulsar is one of the best examples of an evolved pulsar wind nebula, allowing access to the particle injection history and the interaction with the supernova ejecta. We report on the INTEGRAL discovery of extended emission above 18 keV from the Vela nebula. The northern side has no known counterparts and it appears l…
On the Extended Emission around the Anomalous X-Ray Pulsar 1E 1547.0-5408
Ng, C. -Y.; Zhu, W. W.; Kaspi, V. M. +4 more
We present an analysis of the extended emission around the anomalous X-ray pulsar 1E 1547.0-5408 using four XMM-Newton observations taken with the source in varying states of outburst as well as in quiescence. We find that the extended emission flux is highly variable and strongly correlated with the flux of the magnetar. Based on this result, as …
The X-Ray Properties of Typical High-redshift Radio-loud Quasars
Brandt, W. N.; Vignali, C.; Saez, C. +5 more
We report spectral, imaging, and variability results from four new XMM-Newton observations and two new Chandra observations of high-redshift (z >~ 4) radio-loud quasars (RLQs). Our targets span lower, and more representative, values of radio loudness than those of past samples of high-redshift RLQs studied in the X-ray regime. Our spectral anal…
Differential Morphology Between Rest-frame Optical and Ultraviolet Emission from 1.5 < z < 3 Star-forming Galaxies
Koekemoer, Anton M.; Gawiser, Eric; Bond, Nicholas A.
We present the results of a comparative study of the rest-frame optical and rest-frame ultraviolet morphological properties of 117 star-forming galaxies (SFGs), including BX, BzK, and Lyman break galaxies with B < 24.5, and 15 passive galaxies in the region covered by the Wide Field Camera 3 Early Release Science program. Using the internal col…
Herschel/HIFI Observations of IRC+10216: Water Vapor in the Inner Envelope of a Carbon-rich Asymptotic Giant Branch Star
Cernicharo, José; Szczerba, Ryszard; González-Alfonso, Eduardo +6 more
We report the results of observations of 10 rotational transitions of water vapor toward the carbon-rich asymptotic giant branch (AGB) star IRC+10216 (CW Leonis), carried out with Herschel's HIFI instrument. Each transition was securely detected by means of observations using the dual beam switch mode of HIFI. The measured line ratios imply that w…
AKARI Observations of Brown Dwarfs. II. CO2 as Probe of Carbon and Oxygen Abundances in Brown Dwarfs
Yamamura, Issei; Sorahana, Satoko; Tsuji, Takashi
Recent observations with the infrared astronomical satellite AKARI have shown that the CO2 bands at 4.2 µm in three brown dwarfs are much stronger than expected from the unified cloudy model (UCM) based on recent solar C & O abundances. This result has been a puzzle, but we now find it is simply due to the effect of C & O …