Search Publications
Probing the Terminator Region Atmosphere of the Hot-Jupiter XO-1b with Transmission Spectroscopy
Tinetti, G.; Burke, C.; Griffith, C. A. +5 more
We report here the first infrared spectrum of the hot-Jupiter XO-1b. The observations were obtained with the NICMOS instrument on board the Hubble Space Telescope during a primary eclipse of the XO-1 system. Near photon-noise-limited spectroscopy between 1.2 and 1.8 µm allows us to determine the main composition of this hot-Jupiter's planeta…
Low-velocity streams in the solar neighbourhood caused by the Galactic bar
Siebert, A.; Minchev, I.; Bienayme, O. +1 more
We find that a steady-state bar induces transient features at low velocities in the solar neighbourhood velocity distribution due to the initial response of the disc, following the formation of the bar. We associate these velocity streams with two quasi-periodic orbital families, librating around the stable x1(1) and x1(2) or…
Theory and observation of electromagnetic ion cyclotron triggered emissions in the magnetosphere
Dandouras, Iannis; Masson, Arnaud; Omura, Yoshiharu +5 more
We develop a nonlinear wave growth theory of electromagnetic ion cyclotron (EMIC) triggered emissions observed in the inner magnetosphere. We first derive the basic wave equations from Maxwell's equations and the momentum equations for the electrons and ions. We then obtain equations that describe the nonlinear dynamics of resonant protons interac…
Herschel observations of EXtra-Ordinary Sources (HEXOS): The present and future of spectral surveys with Herschel/HIFI
de Graauw, Th.; Menten, K. M.; Falgarone, E. +56 more
We present initial results from the Herschel GT key program: Herschel observations of EXtra-Ordinary Sources (HEXOS) and outline the promise and potential of spectral surveys with Herschel/HIFI. The HIFI instrument offers unprecedented sensitivity, as well as continuous spectral coverage across the gaps imposed by the atmosphere, opening up a larg…
Herschel-ATLAS: Extragalactic number counts from 250 to 500 microns
Rodighiero, G.; Valtchanov, I.; Gardner, Jonathan P. +40 more
Aims: The Herschel-ATLAS survey (H-ATLAS) will be the largest area survey to be undertaken by the Herschel Space Observatory. It will cover 550 sq. deg. of extragalactic sky at wavelengths of 100, 160, 250, 350 and 500 µm when completed, reaching flux limits (5σ) from 32 to 145 mJy. We here present galaxy number counts obtained for SPIR…
Low-Redshift Lyα Selected Galaxies from GALEX Spectroscopy: A Comparison with Both UV-Continuum Selected Galaxies and High-Redshift Lyα Emitters
Cowie, Lennox L.; Barger, Amy J.; Hu, Esther M.
We construct a sample of low-redshift Lyα emission-line selected sources from Galaxy Evolution Explorer (GALEX) grism spectroscopy of nine deep fields to study the role of Lyα emission in galaxy populations with cosmic time. Our final sample consists of 119 (141) sources selected in the redshift interval z = 0.195-0.44 (z = 0.65-1.25) from the FUV…
Multiple Stellar Populations in the Galactic Globular Cluster NGC 6752
Anderson, J.; Milone, A. P.; Marino, A. F. +6 more
We have carried out high-precision photometry on a large number of archival Hubble Space Telescope images of the Galactic globular cluster NGC 6752, to search for signs of multiple stellar populations. We find a broadened main sequence (MS) and demonstrate that this broadening cannot be attributed either to binaries or to photometric errors. There…
X-ray groups and clusters of galaxies in the Subaru-XMM Deep Field
Finoguenov, A.; Smolčić, V.; McLure, R. J. +20 more
We present the results of a search for galaxy clusters in the Subaru-XMM Deep Field (SXDF). We reach a depth for a total cluster flux in the 0.5-2 keV band of 2 × 10-15 erg cm-2 s-1 over one of the widest XMM-Newton contiguous raster surveys, covering an area of 1.3deg2. Cluster candidates are identified…
The seeds of star formation in the filamentary infrared-dark cloud G011.11-0.12
Henning, Th.; Krause, O.; Beuther, H. +5 more
Context. Infrared-dark clouds (IRDCs) are the precursors to massive stars and stellar clusters. G011.11-0.12 is a well-studied filamentary IRDC, though, to date, the absence of far-infrared data with sufficient spatial resolution has limited the understanding of the structure and star-formation activity.
Aims: We use Herschel to study the emb…
The Absolute Magnitudes of Type Ia Supernovae in the Ultraviolet
Filippenko, Alexei V.; Foley, Ryan J.; Kirshner, Robert P. +19 more
We examine the absolute magnitudes and light-curve shapes of 14 nearby (redshift z = 0.004-0.027) Type Ia supernovae (SNe Ia) observed in the ultraviolet (UV) with the Swift Ultraviolet/Optical Telescope. Colors and absolute magnitudes are calculated using both a standard Milky Way extinction law and one for the Large Magellanic Cloud that has bee…