Search Publications
High-Resolution X-Ray Imaging of the Center of IC 342
Mak, Daisy S. Y.; Pun, Chun S. J.; Kong, Albert K. H.
We present the results of a high-resolution (θFWHM ~ 0.5'') 12 ks Chandra HRC-I observation of the starburst galaxy IC 342 taken on 2006 April 2. We identify 23 X-ray sources within the central 30' × 30' region of IC 342 and resolve the historical ultraluminous X-ray source (ULX), X3, near the nucleus into two sources, namely, C12 and C…
A Systematic Survey of H I Lyα and O VI Doublet Profiles Observed in Polar Coronal Holes at Solar Minimum
Nakagawa, Akinari
A systematic, comprehensive survey of H I Lyα and O VI doublet profiles in polar coronal holes is performed using spectroscopic observation by the SOHO Ultraviolet Coronagraph Spectrometer (UVCS) at solar minimum in 1996-1997. By decomposing coronal hole profiles into component Gaussians, we determine detailed height distributions of profile param…
Relativistic Outflows in Two Quasars in the Chandra Deep Field South
Wang, J. X.; Zheng, Z. Y.
In this paper we provide new 1 Ms Chandra ACIS spectra of two quasars in the Chandra Deep Field South (CDF-S) which had strong and extremely blueshifted X-ray emission/absorption line features in previous 1 Ms spectra, with outflowing bulk velocity v ~ 0.65-0.84c. In the new 1 Ms spectra, the relativistic blueshifted line feature is solidly confir…
XMM-Newton Observations of the Red Type 1.8 Quasar 2M1049+5837: Reflection from Cold and Warm (Ionized) Matter
Wilkes, B. J.; Pounds, K. A.; Schmidt, G. D.
Chandra observations of the type 1.8, low-redshift (z = 0.115), red (J - KS ~ 2) quasar 2MASSJ 104943+583750 (2M1049+5837) indicated an unusually hard X-ray spectrum (HR ~ 0.6), suggesting obscuration of NH ~ 4 × 1022 cm-2 and a flat Γ ~ 0.4 power-law slope. A higher signal-to-noise ratio XMM-Newton obse…
The Tilted Solar Dipole as Observed and Modeled during the 1996 Solar Minimum
Raouafi, N. -E.; Petrie, G. J. D.; Norton, A. A.
We examine the tilt of the solar magnetic dipole away from the rotational axis near the 1996 solar minimum. A persistent tilted dipole may result from an MHD instability acting on the toroidal bands in the solar interior. Nonaxisymmetric eruption of sunspots has been predicted by dynamo theory and observed in sunspot location patterns. The decay o…
Discovery and Interpretation of an X-Ray Period in the Galactic Center Source CXOGC J174536.1-285638
Muno, Michael P.; Eikenberry, Stephen S.; Bandyopadhyay, Reba M. +1 more
We present X-ray and infrared observations of the X-ray source CXOGC J174536.1-285638. Previous observations suggest that this source may be an accreting binary with a high-mass donor (HMXB) or a colliding wind binary (CWB). Based on the Chandra and XMM-Newton light curve, we have found an apparent 189 +/- 6 day periodicity with better than 99.997…
IC 4406: A Radio-Infrared View
Hora, Joseph L.; Trigilio, Corrado; Cerrigone, Luciano +1 more
IC 4406 is a large (about 100'' × 30'') southern bipolar planetary nebula composed of two elongated lobes extending from a bright central region where there is evidence for the presence of a large torus of gas and dust. We show new observations of this source performed with IRAC (Spitzer Space Telescope) and the Australia Telescope Compact Array. …
SUBARU High-Dispersion Spectroscopy of Hα and [N II] 6583 Å Emission in the HH 46/47 Jet
Pyo, Tae-Soo; Takami, Michihiro; Hayashi, Masahiko +2 more
We present slit-scan observations of the Hα and [N II] 6583 Å emission lines toward the HH 46/47 jet with the Subaru Telescope. The spectral resolution of R = 3.6 × 104 allowed us to study the kinematics of individual features in unprecedented detail. The spectra show (1) the main jet component (VLSR ~ - 160 km s-1…
RX J1648.7+6109: Witnessing the Formation of a Massive Group/Poor Cluster and Its Brightest Galaxy
Mulchaey, John S.; Lubin, Lori M.; Jeltema, Tesla E.
Using deep Chandra and optical spectroscopic observations, we investigate an intriguing young massive group, RX J1648.7+6109, at z = 0.376, and we combine these observations with previous measurements to fit the scaling relations of intermediate-redshift groups and poor clusters. RX J1648 appears to be in an early stage of formation; while it foll…
A Search for Temperature and Density Variations in NGC 7027 with the Hubble Space Telescope
Bieging, John H.; Tielens, A. G. G. M.; Boley, Paul A. +1 more
We observed the young planetary nebula NGC 7027 with the HST Imaging Spectrograph (STIS) in long-slit mode at five slit positions along the major axis of the nebula, over the wavelength range from 3000 to ~10,000 Å. We used dereddened line ratios to determine line-of-sight average values for (1) He++ and He+ ionization fracti…