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SDSS J042348.57-041403.5AB: A Brown Dwarf Binary Straddling the L/T Transition
Burrows, Adam; Kirkpatrick, J. Davy; Burgasser, Adam J. +3 more
We present the discovery of SDSS J042348.57-041403.5 as a closely separated (0.16") brown dwarf binary, resolved by the Hubble Space Telescope Near-Infrared Camera and Multi-Object Spectrometer. Physical association is deduced from the angular proximity of the components and constraints on their common proper motion. SDSS 0423-0414AB appears to be…
The 1st INTEGRAL SPI-ACS gamma-ray burst catalogue
Hurley, K.; Rau, A.; Lichti, G. G. +1 more
We present the sample of gamma-ray bursts detected with the anti-coincidence shield ACS of the spectrometer SPI on-board INTEGRAL for the first 26.5 months of mission operation (up to Jan. 2005). SPI-ACS works as a nearly omnidirectional gamma-ray burst detector above ~80 keV but lacks spatial and spectral information. In this catalogue, the prope…
The Metallicity Distribution Function of Field Stars in M31's Bulge
Sarajedini, Ata; Jablonka, Pascale
We have used Hubble Space Telescope Wide Field Planetary Camera 2 observations to construct a color-magnitude diagram (CMD) for the bulge of M31 at a location ~1.6 kpc from the galaxy's center. Using scaled solar abundance theoretical red giant branches with a range of metallicities, we have translated the observed colors of the stars in the CMD t…
The opposition surge of Enceladus: HST observations 338-1022 nm
French, Richard G.; Verbiscer, Anne J.; McGhee, Colleen A.
Hubble Space Telescope (HST) Wide-Field Planetary Camera (WFPC2) observations at phase angles in the range α=0.26°-6.4° obtained at every opposition and near quadrature between October 1996 and December 2002 reveal the opposition effect of Enceladus. We present a photometric analysis of nearly 200 images obtained through the five broadband UVBRI f…
An Ultracompact X-Ray Binary in the Globular Cluster M15 (NGC 7078)
Knigge, C.; Charles, P. A.; Long, K. S. +5 more
We have used the Advanced Camera for Surveys on board the Hubble Space Telescope to image the core of the globular cluster M15 in the far-ultraviolet (FUV) wave band. Based on these observations, we identify the FUV counterpart of the recently discovered low-mass X-ray binary M15 X-2. Our time-resolved FUV photometry shows a modulation with 0.062+…
Rotationally Resolved 8-35 Micron Spitzer Space Telescope Observations of the Nucleus of Comet 9P/Tempel 1
A'Hearn, M. F.; Groussin, O.; Charmandaris, V. +6 more
We have utilized the Spitzer Space Telescope (SST) Infrared Spectrograph (IRS) to directly observe thermal emission from the nucleus of comet 9P/Tempel 1 on UT 2004 March 25-27. We obtained 8-35 µm low-resolution (R~100) spectra and contemporaneous 16 and 22 µm photometric imaging over a 39 hr period. The comet was 3.7 AU from the Sun …
XMM-Newton EPIC observations of the ultraluminous X-ray source NGC 5204 X-1
Warwick, R. S.; Roberts, T. P.; Ward, M. J. +2 more
We present the results of two XMM-Newton observations of the ultraluminous X-ray source NGC 5204 X-1. The EPIC spectra are well fitted by the standard spectral model of a black hole X-ray binary, comprising a soft multicolour disc blackbody component plus a harder power-law continuum. The cool (kTin~ 0.2 keV) inner-disc temperature requ…
Discovery of a Fifth Image of the Large Separation Gravitationally Lensed Quasar SDSS J1004+4112
Castander, Francisco J.; Hennawi, Joseph F.; Hall, Patrick B. +11 more
We report on the discovery of a fifth lensed image in the large separation lensed quasar system SDSS J1004 + 4112. A faint point source located 0.''2 from the center of the brightest galaxy in the lensing cluster was detected in images taken with the Advanced Camera for Surveys (ACS) and the Near Infrared Camera and Multi-Object Spectrometer (NICM…
Unusual Pulsed X-Ray Emission from the Young, High Magnetic Field Pulsar PSR J1119-6127
Camilo, F.; Gaensler, B. M.; Gonzalez, M. E. +2 more
We present XMM-Newton observations of the radio pulsar PSR J1119-6127, which has an inferred age of 1700 yr and surface dipole magnetic field strength of 4.1×1013 G. We report the first detection of pulsed X-ray emission from PSR J1119-6127. In the 0.5-2.0 keV range, the pulse profile shows a narrow peak with a very high pulsed fraction…
Hubble Space Telescope Advanced Camera for Surveys Weak-Lensing and Chandra X-Ray Studies of the High-Redshift Cluster MS 1054-0321
Ford, H. C.; Jee, M. J.; Illingworth, G. D. +4 more
We present Hubble Space Telescope Advanced Camera for Surveys (ACS) weak-lensing and Chandra X-ray analyses of MS 1054-0321 at z=0.83, the most distant and X-ray-luminous cluster in the Einstein Extended Medium-Sensitivity Survey (EMSS). The high-resolution mass reconstruction through ACS weak lensing reveals the complicated dark matter substructu…