Search Publications
Missions
Journals
Publication Years
Morphologies and Color Gradients of Luminous Evolved Galaxies at z ~ 1.5
McGrath, Elizabeth J.; Stockton, Alan; Canalizo, Gabriela +2 more
We have examined in detail the morphologies of seven z ~ 1.5 passively evolving luminous red galaxies using high-resolution HST NICMOS and ACS imaging data. Almost all of these galaxies appear to be relaxed systems, with smooth morphologies at both rest-frame UV and visible wavelengths. Previous results from spectral synthesis modeling favor a sin…
AKARI/IRC Deep Survey in the North Ecliptic Pole Region
Goto, Tomotsugu; Oyabu, Shinki; Ohyama, Youichi +10 more
We have made adeep and wide imaging survey with all nine AKARI/IRC bands from 2 to 24 µm within ahalf degree of the North Ecliptic Pole. The survey covered acircular area of 0.38deg2 centered at RA = 17h56m, Dec = 66°37' where adeep optical multi-band survey has been conducted by Subaru/Suprime-Cam. The 5σ se…
Wavelet Analysis of AGN X-Ray Time Series: A QPO in 3C 273?
Bregman, J.; Espaillat, C.; Hughes, P. +1 more
Quasi-periodic signals have yielded important constraints on the masses of black holes in galactic X-ray binaries, and here we extend this to active galactic nuclei (AGNs). We employ a wavelet technique to analyze 19 observations of 10 AGNs obtained with the XMM-Newton EPIC pn camera. We report the detection of a candidate 3.3 ks quasi period in 3…
Coronal Mass Ejection-Associated Coronal Dimmings
Biesecker, D. A.; Reinard, A. A.
We report on a statistical analysis of 96 CME-associated EUV coronal dimmings between 1998 and 2000. We investigate the size and location of the events and characterize how these events evolve with time. The durations typically range from 3 to 12 hr. The dimmings appear most frequently within the belt of active regions (20°-50° latitude). Dimming …
Spectral morphology of the X-ray emission from Jupiter's aurorae
Branduardi-Raymont, G.; Galand, M.; Waite, J. H. +5 more
Simultaneous Chandra X-ray and Hubble Space Telescope FUV observations of Jupiter's aurorae carried out in February 2003 have been re-examined to investigate the spatial morphology of the X-ray events in different energy bands. The data clearly show that in the Northern auroral region (in the main auroral oval and the polar cap) events with energy…
Infrared and X-Ray Evidence for Circumstellar Grain Destruction by the Blast Wave of Supernova 1987A
Polomski, Elisha F.; Gehrz, Robert D.; Woodward, Charles E. +10 more
Multiwavelength observations of supernova remnant 1987A show that its morphology and luminosity are rapidly changing at X-ray, optical, infrared (IR), and radio wavelengths as the blast wave from the explosion expands into the circumstellar equatorial ring, produced by mass loss from the progenitor star. The observed IR radiation arises from the i…
Deep Advanced Camera for Surveys Imaging in the Globular Cluster NGC 6397: Reduction Methods
Anderson, Jay; Rich, R. Michael; Stetson, Peter B. +6 more
We describe here the reduction methods that we developed to study the faintest red dwarfs and white dwarfs in an outer field of NGC 6397, which was observed by HST for 126 orbits in 2005. The particular challenge of this data set is that the faintest stars are not readily visible in individual exposures, so special care must be taken to combine th…
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…