Search Publications
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…
The Herbig Ae Star HD 163296 in X-Rays
Drake, Jeremy J.; Swartz, Douglas A.; Ghosh, Kajal K. +5 more
Chandra X-ray imaging spectroscopy of the nearby Herbig Ae star HD 163296 at 100 AU angular resolution is reported. A pointlike, soft (kT~0.5 keV), emission-line source is detected at the location of the star with an X-ray luminosity of 4×1029 ergs s-1 (logLX/Lbol=-5.48). In addition, faint emission alon…
Multiplicity at the Stellar/Substellar Boundary in Upper Scorpius
Kraus, Adam L.; Hillenbrand, Lynne A.; White, Russel J.
We present the results of a high-resolution imaging survey of 12 brown dwarfs and very low mass stars in the closest (~145 pc) young (~5 Myr) OB association, Upper Scorpius. We obtained images with the Advanced Camera for Surveys High Resolution Channel on HST through the F555W (V), F775W (i'), and F850LP (z') filters. This survey discovered three…
Discovery of Multiply Imaged Galaxies behind the Cluster and Lensed Quasar SDSS J1004+4112
Smith, Graham P.; Broadhurst, Tom; Maoz, Dan +7 more
We have identified three multiply imaged galaxies in Hubble Space Telescope images of the redshift z=0.68 cluster responsible for the large-separation quadruply lensed quasar, SDSS J1004+4112. Spectroscopic redshifts have been secured for two of these systems using the Keck I 10 m telescope. The most distant lensed galaxy, at z=3.332, forms at lea…
Thermal X-Ray Emission from Shocked Ejecta in Type Ia Supernova Remnants. II. Parameters Affecting the Spectrum
Badenes, Carles; Borkowski, Kazimierz J.; Bravo, Eduardo
The supernova remnants (SNRs) left behind by Type Ia supernovae (SNe) provide an excellent opportunity for the study of these enigmatic objects. In a previous work we showed that it is possible to use the X-ray spectra of young Type Ia SNRs to explore the physics of Type Ia SNe and identify the relevant mechanism underlying these explosions. Our s…
The Fading of Transient Anomalous X-Ray Pulsar XTE J1810-197
Gotthelf, E. V.; Halpern, J. P.
Three observations of the 5.54 s transient anomalous X-ray pulsar XTE J1810-197 obtained over 6 months with the Newton X-ray Multi-Mirror (XMM-Newton) mission are used to study its spectrum and pulsed light curve as the source fades from outburst. The decay is consistent with an exponential of time constant ~300 days but not a power law as predict…
A Coherent Timing Solution for the Nearby Isolated Neutron Star RX J1308.6+2127/RBS 1223
van Kerkwijk, M. H.; Kaplan, D. L.
We present a phase-connected timing solution for the nearby isolated neutron star RX J1308.6+2127 (RBS 1223). From dedicated Chandra observations as well as archival Chandra and XMM-Newton data spanning a period of 5 years, we demonstrate that the 10.31 s pulsations are slowing down steadily at a rate of P˙=1.120(3)×10-13 s s-1
Chandra X-Ray Observation of a Mature Cloud-Shock Interaction in the Bright Eastern Knot Region of Puppis A
Petre, Robert; Hwang, Una; Flanagan, Kathryn A.
We present Chandra X-ray images and spectra of the most prominent cloud-shock interaction region in the Puppis A supernova remnant. The bright eastern knot (BEK) has two main morphological components: (1) a bright compact knot that lies directly behind the apex of an indentation in the eastern X-ray boundary; and (2) lying 1' westward behind the s…
XMM-Newton View of PKS 2155-304: Characterizing the X-Ray Variability Properties with EPIC pn
Treves, A.; Celotti, A.; Zhang, Y. H. +2 more
Starting from XMM-Newton EPIC pn data, we present the X-ray variability characteristics of PKS 2155-304 using a simple analysis of the excess variance, σ2XS, and of the fractional rms variability amplitude, Fvar. The scatter in σ2XS and Fvar, calculated using 500 s long segments of …