Search Publications
A surprisingly high pair fraction for extremely massive galaxies at z ~ 3 in the GOODS NICMOS survey
Papovich, Casey; Dickinson, Mark; Conselice, Christopher J. +4 more
We calculate the major pair fraction and derive the major merger fraction and rate for 82 massive (M* > 1011Msolar) galaxies at 1.7 < z < 3.0 utilizing deep Hubble Space Telescope NICMOS data taken in the GOODS north and south fields. For the first time, our NICMOS data provide imaging with sufficient angu…
New CTI Correction Method for Spaced-Row Charge Injection of the Suzaku X-Ray Imaging Spectrometer
Dotani, Tadayasu; Miller, Eric D.; Mori, Hideyuki +21 more
The charge transfer inefficiency (CTI) of the X-ray CCDs on board the Suzaku satellite (X-ray Imaging Spectrometers; XIS) has increased since the launch due to radiation damage, and the energy resolution has been degraded. To improve the CTI, we have applied a spaced-row charge injection (SCI) technique to the XIS in orbit; by injecting charges in…
X-Ray Absorption by WHIM in the Sculptor Wall
Humphrey, Philip J.; Buote, David A.; Gastaldello, Fabio +3 more
We present XMM Reflection Grating Spectrometer (RGS) and Chandra Low-Energy Transmission Grating (LETG) observations of the blazar, H 2356-309, located behind the Sculptor Wall, a large-scale galaxy structure expected to harbor high-density Warm-Hot Intergalactic Medium (WHIM). Our simultaneous analysis of the RGS and LETG spectra yields a 3σ dete…
Discovery of two distinct red clumps in NGC 419: a rare snapshot of a cluster at the onset of degeneracy
Girardi, Léo; Rubele, Stefano; Kerber, Leandro
Colour-magnitude diagrams (CMDs) of the Small Magellanic Cloud (SMC) star cluster NGC 419, derived from Hubble Space Telescope (HST)/Advanced Camera for Surveys (ACS) data, reveal a well-delineated secondary clump located below the classical compact red clump typical of intermediate-age populations. We demonstrate that this feature belongs to the …
A systematic study of variability in a sample of ultraluminous X-ray sources
Vaughan, S.; Roberts, T. P.; Heil, L. M.
We present results from a study of short-term variability in 19 archival observations by XMM-Newton of 16 ultraluminous X-ray sources (ULXs). Eight observations (six sources) showed intrinsic variability with power spectra in the form of either a power-law or broken power-law-like continuum and in some cases quasi-periodic oscillations (QPOs). The…
A spatially resolved map of the kinematics, star formation and stellar mass assembly in a star-forming galaxy at z = 4.9
Smail, I.; Jones, T.; van Dokkum, P. +8 more
We present a detailed study of the spatially resolved kinematics, star formation and stellar mass in a highly amplified galaxy at z = 4.92 behind the lensing cluster MS1358+62. We use the observed optical, near- and mid-infrared imaging from Hubble Space Telescope ACS & NICMOS and Spitzer IRAC to derive the stellar mass and the Gemini/NIFS IFU…
Searching for a link between the magnetic nature and other observed properties of Herbig Ae/Be stars and stars with debris disks
Hamaguchi, K.; Hubrig, S.; Stelzer, B. +6 more
Context: Recently, evidence for the presence of weak magnetic fields in Herbig Ae/Be stars has been found in several studies.
Aims: We seek to expand the sample of intermediate-mass pre-main sequence stars with circular polarization data to measure their magnetic fields, and to determine whether magnetic field properties in these stars are cor…
Timing characteristics of the hard X-ray emission from bright X-ray pulsars based on INTEGRAL data
Tsygankov, S. S.; Lutovinov, A. A.
We review the results of a timing analysis of the observations for ten bright X-ray pulsars (with fluxes >100 mCrab in the 20-100 keV energy band) that fell within the INTEGRAL field of view from 2003 to 2007. The dependence of the pulse profile on the energy and intrinsic source luminosity has been investigated; particular attention has been p…
On the ionospheric structure of Titan
Garnier, P.; Wahlund, J. -E.; Ågren, K. +4 more
In this study we present data from 17 Titan flybys showing that solar photons are the main ionisation source of Titan's dayside atmosphere. This is the first comprehensive study of Solar Zenith Angle (SZA) dependence of the electron number density and electron temperature at the ionospheric peak. The results show on average four times more plasma …
Titan's Surface Brightness Temperatures
Pearl, J. C.; Flasar, F. M.; Coustenis, A. +17 more
Radiance from the surface of Titan can be detected from space through a spectral window of low opacity in the thermal infrared at 19 µm (530 cm-1). By combining Composite Infrared Spectrometer observations from Cassini's first four years, we have mapped the latitude distribution of zonally averaged surface brightness temperatures.…