Search Publications
An Intensive Hubble Space Telescope Survey for z>1 Type Ia Supernovae by Targeting Galaxy Clusters
Gladders, M. D.; Panagia, N.; Stern, D. +58 more
We present a new survey strategy to discover and study high-redshift Type Ia supernovae (SNe Ia) using the Hubble Space Telescope (HST). By targeting massive galaxy clusters at 0.9 < z < 1.5, we obtain a twofold improvement in the efficiency of finding SNe compared to an HST field survey and a factor of 3 improvement in the total yield of SN…
Searching for massive galaxies at z ≥ 3.5 in GOODS-North
Cimatti, A.; Daddi, E.; Rodighiero, G. +5 more
Aims: We constrain the space density and properties of massive galaxy candidates at redshifts of z≥3.5 in the Great Observatories Origin Deep Survey North (GOODS-N) field. By selecting sources in the Spitzer + IRAC bands, a sample highly complete in stellar-mass is assembled, including massive galaxies that are very faint in the optical/near-IR ba…
The ARTEMIS Catalog of LASCO Coronal Mass Ejections. Automatic Recognition of Transient Events and Marseille Inventory from Synoptic maps
Llebaria, A.; Lamy, P.; Boursier, Y. +2 more
The LASCO-C2 coronagraph aboard the SOHO solar observatory has been providing a continuous flow of coronal images since 1996. Synoptic maps for each Carrington rotation have been built from these images, and offer a global view of the temporal evolution of the solar corona, particularly the occurrence of transient events. Coronal Mass Ejections (C…
Isotopic evolution of the major constituents of Titan's atmosphere based on Cassini data
Mousis, Olivier; Mandt, Kathleen E.; Waite, J. Hunter +5 more
Using Cassini ion neutral mass spectrometer stable isotope observations, we have developed a comprehensive method for modeling the time-evolution of the stable isotopic ratios in Titan's major constituents, N 2, CH 4 and H 2. Our model provides constraints on the initial 14N/ 15N ratio in N
The quiescent spectral energy distribution of V404 Cyg
Fender, R. P.; Rupen, M.; Casares, J. +4 more
We present a multiwavelength study of the black hole X-ray binary V404 Cyg in quiescence, focusing upon the spectral energy distribution (SED). Radio, optical, ultraviolet (UV) and X-ray coverage is simultaneous. We supplement the SED with additional non-simultaneous data in the optical through infrared where necessary. The compiled SED is the mos…
Shoreline features of Titan's Ontario Lacus from Cassini/VIMS observations
Sotin, Christophe; Barnes, Jason W.; Soderblom, Jason M. +12 more
We analyze observations of Titan's south polar lake Ontario Lacus obtained by Cassini's Visual and Infrared Mapping Spectrometer during the 38th flyby of Titan (T38; 2007 December 5). These near-closest-approach observations have the highest signal-to-noise, the finest spatial resolution, and the least atmospheric influence of any near-infrared la…
Sunyaev-Zel'Dovich Effect Observations of the Bullet Cluster (1E 0657-56) with APEX-SZ
Kneissl, R.; Menten, K. M.; Ade, P. A. R. +33 more
We present observations of the Sunyaev-Zel'dovich effect (SZE) in the Bullet cluster (1E 0657-56) using the APEX-SZ instrument at 150 GHz with a resolution of 1'. The main results are maps of the SZE in this massive, merging galaxy cluster. The cluster is detected with 23σ significance within the central 1' radius of the source position. The SZE m…
The Genesis of Morphologies in Extended Radio Sources: X-Shapes, Off-Axis Distortions, and Giant Radio Sources
Saripalli, Lakshmi; Subrahmanyan, Ravi
We examine relationships between the morphology in double radio sources and the radio-optical position angle offset—the relative orientation of the radio axis with respect to the major axis of the host galaxy. The study was done for a representative sample of radio sources, the nearby (redshift z < 0.5) 3CRR sources, and separately for samples …
A self-consistent stellar and 3D nebular model of planetary nebula IC 418
Morisset, C.; Georgiev, L.
Aims: We present a coherent stellar and nebular model that reproduces observations of the planetary nebula IC 418. We aim to test whether a stellar model found to provide an optimal description of the stellar observations is able to satisfactory ionize the nebula and reproduce the nebular observations, a finding that is by no mean evident. This al…
Solar - Terrestrial Simulation in the STEREO Era: The 24 - 25 January 2007 Eruptions
Vourlidas, A.; Lugaz, N.; Roussev, I. I. +1 more
The SECCHI instruments aboard the recently launched STEREO spacecraft enable for the first time the continuous tracking of coronal mass ejections (CMEs) from the Sun to 1 AU. We analyze line-of-sight observations of the 24 - 25 January 2007 CMEs and fill the 20-hour gap in SECCHI coverage in 25 January by performing a numerical simulation using a …