Search Publications
The Greater Impact of Mergers on the Growth of Massive Galaxies: Implications for Mass Assembly and Evolution since z sime 1
Ellis, Richard S.; Belli, Sirio; Kodama, Tadayuki +3 more
Using deep infrared observations conducted with the MOIRCS imager on the Subaru Telescope in the northern GOODS field combined with public surveys in GOODS-S, we investigate the dependence on stellar mass, M *, and galaxy type of the close pair fraction (5 h -1 kpc < r sep < 20 h -1 kpc) and implie…
Molecular Signatures in the Near-Infrared Dayside Spectrum of HD 189733b
Deming, D.; Tinetti, G.; Bouwman, J. +5 more
We have measured the dayside spectrum of HD 189733b between 1.5 and 2.5 µm using the NICMOS instrument on the Hubble Space Telescope. The emergent spectrum contains significant modulation, which we attribute to the presence of molecular bands seen in absorption. We find that water (H2O), carbon monoxide (CO), and carbon dioxide (C…
The global martian volcanic evolutionary history
Werner, Stephanie C.
Viking mission image data revealed the total spatial extent of preserved volcanic surface on Mars. One of the dominating surface expressions is Olympus Mons and the surrounding volcanic province Tharsis. Earlier studies of the global volcanic sequence of events based on stratigraphic relationships and crater count statistics were limited to the im…
PROSAC: a submillimeter array survey of low-mass protostars. II. The mass evolution of envelopes, disks, and stars from the Class 0 through I stages
Wilner, D. J.; van Dishoeck, E. F.; Lommen, D. +5 more
Context: The key question about early protostellar evolution is how matter is accreted from the large-scale molecular cloud, through the circumstellar disk onto the central star.
Aims: We constrain the masses of the envelopes, disks, and central stars of a sample of low-mass protostars and compare the results to theoretical models for the evol…
Analysis of Titan's neutral upper atmosphere from Cassini Ion Neutral Mass Spectrometer measurements
Waite, J. H.; Yelle, R. V.; Kasprzak, W. T. +10 more
In this paper we present an in-depth study of the distributions of various neutral species in Titan's upper atmosphere, between 950 and 1500 km for abundant species (N 2, CH 4, H 2) and between 950 and 1200 km for other minor species. Our analysis is based on a large sample of Cassini/INMS (Ion Neutral Mass Spectro…
The great observatories origins deep survey. VLT/VIMOS spectroscopy in the GOODS-south field
Daddi, E.; Popesso, P.; Cesarsky, C. +10 more
Aims: We present the first results from the VIsible Multiobject Spectrograph (VIMOS) ESO/GOODS program of spectroscopy for faint galaxies in the Chandra Deep Field South (CDF-S). This program complements the FORS2 ESO/GOODS campaign.
Methods: All 3312 spectra were obtained in service mode with VIMOS at the ESO/VLT UT3. The VIMOS LR-Blue and MR…
Nonlinear mechanisms of lower-band and upper-band VLF chorus emissions in the magnetosphere
Katoh, Yuto; Omura, Yoshiharu; Hikishima, Mitsuru +2 more
We develop a nonlinear wave growth theory of magnetospheric chorus emissions, taking into account the spatial inhomogeneity of the static magnetic field and the plasma density variation along the magnetic field line. We derive theoretical expressions for the nonlinear growth rate and the amplitude threshold for the generation of self-sustaining ch…
History of Galaxy Interactions and Their Impact on Star Formation Over the Last 7 Gyr from GEMS
Papovich, Casey; Bell, Eric F.; Somerville, Rachel S. +22 more
We perform a comprehensive estimate of the frequency of galaxy mergers and their impact on star formation over z~ 0.24-0.80 (lookback time T b~ 3-7 Gyr) using ~3600 (M>= 1 × 109 M sun) galaxies with GEMS Hubble Space Telescope, COMBO-17, and Spitzer data. Our results are as follows. (1) Among ~790 high-mass (M&g…
A New Approach to Analyzing Solar Coronal Spectra and Updated Collisional Ionization Equilibrium Calculations. II. Updated Ionization Rate Coefficients
Savin, D. W.; Landi, E.; Bryans, P.
We have re-analyzed Solar Ultraviolet Measurement of Emitted Radiation (SUMER) observations of a parcel of coronal gas using new collisional ionization equilibrium (CIE) calculations. These improved CIE fractional abundances were calculated using state-of-the-art electron-ion recombination data for K-shell, L-shell, Na-like, and Mg-like ions of al…
Automated LASCO CME Catalog for Solar Cycle 23: Are CMEs Scale Invariant?
Berghmans, D.; Robbrecht, E.; Van der Linden, R. A. M.
In this paper, we present the first automatically constructed LASCO coronal mass ejection (CME) catalog, a result of the application of the Computer Aided CME Tracking software (CACTus) on the LASCO archive during the interval 1997 September-2007 January. We have studied the CME characteristics and have compared them with similar results obtained …