Search Publications
The Burst Spectra of EXO 0748-676 during a Long 2003 XMM-Newton Observation
Boirin, L.; Miller, J. M.; Lewin, W. H. G. +4 more
Gravitationally redshifted absorption lines from highly ionized iron have been previously identified in the burst spectra of the neutron star in EXO 0748-676. To repeat this detection we obtained a long, nearly 600 ks observation of the source with XMM-Newton in 2003. The spectral features seen in the burst spectra from the initial data are not re…
Spectral, Spatial, and Time Properties of the Hydrogen Nebula around Exoplanet HD 209458b
Ben-Jaffel, Lotfi
All far-ultraviolet (FUV) observations of HD 209458 tend to support a scenario in which the inflated hydrogen atmosphere of its planetary companion strongly absorbs the stellar Lyα flux during transit. However, it is not clear how the transit absorption depends on the selected wavelength range in the stellar line profile, nor how the atomic hydrog…
Discovery of a VHE gamma-ray source coincident with the supernova remnant CTB 37A
Santangelo, A.; Quirrenbach, A.; Ripken, J. +148 more
Aims: The supernova remnant (SNR) complex CTB 37 is an interesting candidate for observations with very high energy (VHE) γ-ray telescopes such as HESS. In this region, three SNRs are seen. One of them is potentially associated with several molecular clouds, a circumstance that can be used to probe the acceleration of hadronic cosmic rays.
Met…
Restoring the Suzaku Source Position Accuracy and Point-Spread Function
Maeda, Yoshitomo; Ishida, Manabu; Iizuka, Ryo +9 more
We present an empirical correction of sky coordinates of X-ray photons obtained with the X-ray Imaging Spectrometer (XIS) aboard the Suzaku satellite to improve the source position accuracy and restore the point-spread function (PSF). The XIS images are known to have an uncertainty in position of up to 1', and to show considerable degradations of …
Semi-annual oscillations in Saturn's low-latitude stratospheric temperatures
Tokunaga, Alan T.; Baines, Kevin H.; Hora, Joseph L. +25 more
Observations of oscillations of temperature and wind in planetary atmospheres provide a means of generalizing models for atmospheric dynamics in a diverse set of planets in the Solar System and elsewhere. An equatorial oscillation similar to one in the Earth's atmosphere has been discovered in Jupiter. Here we report the existence of similar oscil…
A STIS Survey for O VI Absorption Systems at 0.12 < z lesssim 0.5. I. The Statistical Properties of Ionized Gas
Chen, Hsiao-Wen; Thom, C.
We have conducted a systematic survey for intervening O VI absorbers in available echelle spectra of 16 QSOs at zQSO = 0.17-0.57. These spectra were obtained using HST STIS with the E140M grating. Our search uncovered a total of 27 foreground O VI absorbers with rest-frame absorption equivalent width Wr(1031) gtrsim 25 mÅ. Te…
GEMS Survey Data and Catalog
Bell, Eric F.; Somerville, Rachel S.; Wisotzki, Lutz +14 more
We describe the data reduction and object cataloging for the GEMS survey, a large-area (800 arcmin2) two-band (F606W and F850LP) imaging survey with the Advanced Camera for Surveys on the Hubble Space Telescope, centered on the Chandra Deep Field-South.
Star Formation Rates in Lyman Break Galaxies: Radio Stacking of LBGs in the COSMOS Field and the Sub-µJy Radio Source Population
Smolčić, V.; Taniguchi, Y.; Yun, M. S. +10 more
We present an analysis of the radio properties of large samples of Lyman break galaxies (LBGs) at z ~ 3, 4, and 5 from the COSMOS field. The median stacking analysis yields a statistical detection of the z ~ 3 LBGs (U-band dropouts), with a 1.4 GHz flux density of 0.90 +/- 0.21 µJy. The stacked emission is unresolved, with a size <1, or a…
The Stellar Content of Galaxy Halos: A Comparison between ΛCDM Models and Observations of M31
Robertson, Brant E.; Tumlinson, Jason; Johnston, Kathryn V. +4 more
Recent observations have revealed that high surface brightness, metal-rich debris is present over large regions of the Andromeda (M31) stellar halo. We use a set of numerical models to determine whether extended metal-rich debris is expected to exist in galaxy halos formed in a hierarchical ΛCDM universe. We identify tidal debris in the simulation…
Tilt of Emerging Bipolar Magnetic Regions on the Sun
Kosovichev, A. G.; Stenflo, J. O.
Magnetic fields emerging from the Sun's interior carry information about the physical processes of magnetic field generation and transport in the convection zone. A statistical analysis of variations of the tilt angle of bipolar magnetic regions during the emergence, observed from SOHO MDI, shows that the systematic tilt with respect to the equato…