Search Publications
The MOSDEF Survey: The Nature of Mid-infrared Excess Galaxies and a Comparison of IR and UV Star Formation Tracers at z ∼ 2
Siana, Brian; Azadi, Mojegan; Coil, Alison +11 more
We present an analysis using the MOSFIRE Deep Evolution Field (MOSDEF) survey on the nature of “MIR-excess” galaxies, which have star formation rates (SFRs) inferred from mid-infrared (MIR) data that are substantially elevated relative to those estimated from dust-corrected UV data. We use a sample of ∼200 galaxies and active galactic nuclei (AGNs…
The Serpens filament at the onset of slightly supercritical collapse
Menten, K. M.; Henkel, C.; Gong, Y. +5 more
The Serpens filament, as one of the nearest infrared dark clouds, is regarded as a pristine filament at a very early evolutionary stage of star formation. In order to study its molecular content and dynamical state, we mapped this filament in seven species: C18O, HCO+, HNC, HCN, N2H+, CS, and CH3
Emission of solar chromospheric and transition region features related to the underlying magnetic field
Barczynski, K.; Peter, H.; Chitta, L. P. +1 more
Context. The emission of the upper atmosphere of the Sun is closely related to magnetic field concentrations at the solar surface.
Aims: It is well established that this relation between chromospheric emission and magnetic field is nonlinear. Here we investigate systematically how this relation, characterised by the exponent of a power-law fi…
The Spectral and Environment Properties of z ∼ 2.0-2.5 Quasar Pairs
Hennawi, Joseph F.; Rafelski, Marc; Neeleman, Marcel +5 more
We present the first results from our survey of intervening and proximate Lyman limit systems (LLSs) at z ∼ 2.0-2.5 using the Wide Field Camera 3 on board the Hubble Space Telescope. The quasars in our sample are projected pairs with proper transverse separations R ⊥ ≤ 150 kpc and line-of-sight velocity separations ≲11,000 km s-1
Three-dimensional structure of the Upper Scorpius association with the Gaia first data release
Moraux, Estelle; Galli, Phillip A. B.; Joncour, Isabelle
Using new proper motion data from recently published catalogues, we revisit the membership of previously identified members of the Upper Scorpius association. We confirmed 750 of them as cluster members based on the convergent point method, compute their kinematic parallaxes, and combined them with Gaia parallaxes to investigate the 3D structure a…
A Study of a Compound Solar Eruption with Two Consecutive Erupting Magnetic Structures
Chintzoglou, Georgios; Zhang, Jie; Dhakal, Suman K.
We report a study of a compound solar eruption that was associated with two consecutively erupting magnetic structures and correspondingly two distinct peaks, during impulsive phase, of an M-class flare (M8.5). Simultaneous multi-viewpoint observations from SDO, GOES and STEREO-A show that this compound eruption originated from two pre-existing si…
The SAGE photometric survey: technical description
Tan, Ke-Feng; Zhao, Gang; Fan, Zhou +4 more
To investigate a huge sample of data related to the Stellar Abundance and Galactic Evolution (SAGE) survey in more detail, we are performing a northern sky photometric survey named SAGES with the SAGE photometric system. This system consists of eight filters: Strӧmgren-u, SAGE-v, SDSS g, r, i, DDO-51, Hα wide and Hα narrow, i…
Investigation of dust attenuation and star formation activity in galaxies hosting GRBs
Salvaterra, R.; Buat, V.; Vergani, S. D. +6 more
Context. The gamma-ray bursts hosts (GRBHs) are excellent targets to study the extinction properties of dust and its effects on the global emission of distant galaxies. The dust extinction curve is measured along the GRB afterglow line of sight and the analysis of the spectral energy distribution (SED) of the host galaxy gives access to the global…
Methyl isocyanate (CH3NCO): an important missing organic in current astrochemical networks
Gratier, P.; Coutens, A.; Wakelam, V. +3 more
Methyl isocyanate (CH3NCO) is one of the important complex organic molecules detected on the comet 67P/Churyumov-Gerasimenko by Rosetta's Philae lander. It was also detected in hot cores around high-mass protostars along with a recent detection in the solar-type protostar IRAS 16293-2422. We propose here a gas-grain chemical model to fo…
K 2 Ultracool Dwarfs Survey. IV. Monster Flares Observed on the Young Brown Dwarf CFHT-BD-Tau 4
Mullan, D. J.; Burgasser, Adam J.; Gizis, John E. +4 more
We present photometric measurements of two superflares observed on a very young brown dwarf, CFHT-BD-Tau 4, observed during Campaign 13 of the Kepler K 2 mission. The stronger of the two superflares brightened by a factor of ∼48 relative to the quiescent photospheric level, with an increase in Kepler magnitude {{Δ }}\tilde{{K}p}=-4.20. …