Search Publications
X-Ray Emission from the Super-Earth Host GJ 1214
Schmitt, J. H. M. M.; Czesla, S.; Singh, K. P. +2 more
Stellar activity can produce large amounts of high-energy radiation, which is absorbed by the planetary atmosphere leading to irradiation-driven mass loss. We present the detection and an investigation of high-energy emission in a transiting super-Earth host system, GJ 1214, based on XMM-Newton observations. We derive an X-ray luminosity of L…
The Effect of Surface Brightness Dimming in the Selection of High-z Galaxies
Kim, S.; Stiavelli, M.; Bradley, L. +2 more
Cosmological surface brightness (SB) dimming of the form (1 + z)-4 affects all sources. The strong dependence of SB dimming on redshift z suggests the presence of a selection bias when searching for high-z galaxies, i.e., we tend to detect only those galaxies with a high SB. However, unresolved knots of emission are not affected by SB d…
Hot Topic, Warm Loops, Cooling Plasma? Multithermal Analysis of Active Region Loops
Schmelz, J. T.; Pathak, S.; Brooks, D. H. +2 more
We have found indications of a relationship between the differential emission measure (DEM) weighted temperature and the cross-field DEM width for coronal loops. The data come from the Hinode X-ray Telescope, the Hinode EUV Imaging Spectrometer, and the Solar Dynamics Observatory Atmospheric Imaging Assembly. These data show that cooler loops tend…
Observations of the Interplanetary Hydrogen during Solar Cycles 23 and 24. What can We Deduce about the Local Interstellar Medium?
Harris, Walter M.; Quémerais, Eric; Koutroumpa, Dimitra +5 more
Observations of interstellar helium atoms by the Interstellar Boundary Explorer (IBEX) spacecraft in 2009 reported a local interstellar medium (LISM) velocity vector different from the results of the Ulysses spacecraft between 1991 and 2002. The interplanetary hydrogen (IPH), a population of neutrals that fills the space between planets inside the…
Long-term X-Ray Stability and Ultraviolet Variability of the Ionized Absorption in NGC 3783
Brandt, W. N.; Behar, E.; Turner, T. J. +6 more
We present the results of recent Chandra High-Energy Transmission Grating Spectrometer and Hubble Space Telescope Cosmic Origins Spectrograph observations of the nearby Seyfert 1 galaxy NGC 3783, which show a strong, nonvarying X-ray warm absorber and physically related and kinematically varying UV absorption. We compare our new observations to hi…
The Trace of the CNO Cycle in the Ring Nebula NGC 6888
Morisset, C.; Bresolin, F.; García-Rojas, J. +3 more
We present new results on the chemical composition of the Galactic ring nebula NGC 6888 surrounding the WN6(h) star WR136. The data are based on deep spectroscopical observations taken with the High Dispersion Spectrograph at the 8.2 m Subaru Telescope. The spectra cover the optical range from 3700 to 7400 Å. The effect of the CNO cycle is well-id…
The Ground-based H-, K-, and L-band Absolute Emission Spectra of HD 209458b
Zellem, Robert T.; Griffith, Caitlin A.; Swain, Mark R. +2 more
Here we explore the capabilities of NASA's 3.0 m Infrared Telescope Facility (IRTF) and SpeX spectrometer and the 5.08 m Hale telescope with the TripleSpec spectrometer with near-infrared H-, K-, and L-band measurements of HD 209458b's secondary eclipse. Our IRTF/SpeX data are the first absolute L-band spectroscopic emission measurements of any ex…
Imaging the Environment of a z = 6.3 Submillimeter Galaxy with SCUBA-2
Pérez-Fournon, I.; Ivison, R. J.; Omont, A. +24 more
We describe a search for submillimeter emission in the vicinity of one of the most distant, luminous galaxies known, HerMES FLS3, at z = 6.34, exploiting it as a signpost to a potentially biased region of the early universe, as might be expected in hierarchical structure formation models. Imaging to the confusion limit with the innovative, wide-fi…
A Tale of a Rich Cluster at z ~ 0.8 as Seen by the Star Formation Histories of its Early-type Galaxies
Vazdekis, Alexandre; Sánchez-Blázquez, Patricia; Ferré-Mateu, Anna +1 more
We present a detailed stellar population analysis for a sample of 24 early-type galaxies (ETGs) belonging to the rich cluster RX J0152.7-1357 at z = 0.83. We have derived the age, metallicity, abundance pattern, and star formation history (SFH) for each galaxy individually to further characterize this intermediate-z reference cluster. We then stud…
INTEGRAL SPI Observations of Cygnus X-1 in the Soft State: What about the Jet Contribution in Hard X-Rays?
Jourdain, E.; Roques, J. P.; Chauvin, M.
During the first 7 yr of the INTEGRAL mission (2003-2009), Cyg X-1 has essentially been detected in its hard state (HS), with some incursions in intermediate HSs. This long, spectrally stable period allowed in particular the measurement of the polarization of the high-energy component that has long been observed above 200 keV in this peculiar obje…