Search Publications
New 3D gas density maps of NaI and CaII interstellar absorption within 300 pc
Lallement, R.; Welsh, B. Y.; Vergely, J. -L. +1 more
Aims: We present new high resolution (R > 50 000) absorption measurements of the NaI doublet (5889-5895 Å) along 482 nearby sight-lines, in addition to 807 new measurements of the CaII K (3933 Å) absorption line. We have combined these new data with previously reported measurements to produce a catalog of absorptions towards a total of 185…
Optical and near-infrared coverage of SN 2004et: physical parameters and comparison with other Type IIP supernovae
Smartt, S. J.; Maguire, K.; Cappellaro, E. +22 more
We present new optical and near-infrared (NIR) photometry and spectroscopy of the Type IIP supernova (SN), SN 2004et. In combination with already published data, this provides one of the most complete studies of optical and NIR data for any Type IIP SN from just after explosion to +500d. The contribution of the NIR flux to the bolometric light cur…
Northern mid-latitude glaciation in the Late Amazonian period of Mars: Criteria for the recognition of debris-covered glacier and valley glacier landsystem deposits
Head, James W.; Marchant, David R.; Dickson, James L. +2 more
Lobate debris aprons (LDA) and lineated valley fill (LVF) have been known to characterize the mid-latitude regions of Mars since documented by Viking; their flow-like character suggested that deposition of ice in talus pile pore space caused lubrication and flow during an earlier climatic regime. A number of factors have remained uncertain, howeve…
The Lack of Intense Lyα in Ultradeep Spectra of z = 7 Candidates in GOODS-S: Imprint of Reionization?
Maiolino, R.; Dickinson, M.; Giavalisco, M. +10 more
We present ultradeep optical spectroscopy obtained with FORS2 on the Very Large Telescope (VLT) of seven Lyman-break galaxy (LBG) candidates at z>6.5 selected in the GOODS-S field from Hawk-I/VLT and WFC3/HST imaging. For one galaxy we detect a low significance emission line (S/N <= 7), located at λ = 9691.5 ± 0.5 Å and with flux 3.4 × 10
A Multi-color Optical Survey of the Orion Nebula Cluster. II. The H-R Diagram
Panagia, N.; Robberto, M.; Da Rio, N. +4 more
We present a new analysis of the stellar population of the Orion Nebula Cluster (ONC) based on multi-band optical photometry and spectroscopy. We study the color-color diagrams in BVI, plus a narrowband filter centered at 6200 Å, finding evidence that intrinsic color scales valid for main-sequence dwarfs are incompatible with the ONC in the M spec…
The Great Observatories Origins Deep Survey: Constraints on the Lyman Continuum Escape Fraction Distribution of Lyman-break Galaxies at 3.4 < z < 4.5
Stern, D.; Dickinson, M.; Giavalisco, M. +14 more
We use ultra-deep ultraviolet VLT/VIMOS intermediate-band and VLT/FORS1 narrowband imaging in the GOODS Southern field to derive limits on the distribution of the escape fraction (f esc) of ionizing radiation for L >= L* z=3 Lyman-break galaxies (LBGs) at redshift 3.4-4.5. Only one LBG, at redshift z = 3.795, is detected i…
A ground-based near-infrared emission spectrum of the exoplanet HD189733b
Henning, Thomas; Bouwman, Jeroen; Griffith, Caitlin A. +9 more
Detection of molecules using infrared spectroscopy probes the conditions and compositions of exoplanet atmospheres. Water (H2O), methane (CH4), carbon dioxide (CO2), and carbon monoxide (CO) have been detected in two hot Jupiters. These previous results relied on space-based telescopes that do not provide spectrosc…
Analysis of Cassini/CIRS limb spectra of Titan acquired during the nominal mission. I. Hydrocarbons, nitriles and CO 2 vertical mixing ratio profiles
Bézard, Bruno; Vinatier, Sandrine; Nixon, Conor A. +8 more
Observations of the Composite InfraRed Spectrometer (CIRS) during the entire nominal Cassini mission (2004-2008) provide us with an accurate global view of composition and temperature in the middle atmosphere of Titan (between 100 and 500 km). We investigated limb spectra acquired at 0.5cm resolution at nine different latitudes between 56°S and 80…
Mass profiles and c-MDM relation in X-ray luminous galaxy clusters
Rossetti, M.; Molendi, S.; Gastaldello, F. +4 more
Context. Galaxy clusters represent valuable cosmological probes using tests that mainly rely on measurements of cluster masses and baryon fractions. X-ray observations represent one of the main tools for uncovering these quantities.
Aims: We aim to constrain the cosmological parameters Ωm and σ8 using the observed distri…
Jet-powered Molecular Hydrogen Emission from Radio Galaxies
Appleton, P. N.; Ogle, Patrick; Antonucci, Robert +5 more
H2 pure-rotational emission lines are detected from warm (100-1500 K) molecular gas in 17/55 (31% of) radio galaxies at redshift z < 0.22 observed with the Spitzer IR Spectrograph. The summed H2 0-0 S(0)-S(3) line luminosities are L(H2) = 7 × 1038-2 × 1042 erg s-1, yielding warm …