Search Publications
Enhanced Star Formation of Less Massive Galaxies in a Protocluster at z = 2.5
Suzuki, Tomoko L.; Koyama, Yusei; Kodama, Tadayuki +5 more
We investigate a correlation between star formation rate (SFR) and stellar mass for Hα emission-line galaxies (HAEs) in one of the richest protoclusters ever known at z ∼ 2.5, the USS 1558-003 protocluster. This study is based on a 9.7 hr narrowband imaging data with MOIRCS on the Subaru telescope. We are able to construct a sample in combination …
Galaxy Zoo: Mergers - Dynamical models of interacting galaxies
Keel, William C.; Parrish, Michael; Smith, Arfon M. +6 more
The dynamical history of most merging galaxies is not well understood. Correlations between galaxy interaction and star formation have been found in previous studies, but require the context of the physical history of merging systems for full insight into the processes that lead to enhanced star formation. We present the results of simulations tha…
H-ATLAS: a candidate high redshift cluster/protocluster of star-forming galaxies
Pérez-Fournon, I.; Valtchanov, I.; Ivison, R. J. +33 more
We investigate the region around the Planck-detected z = 3.26 gravitationally lensed galaxy HATLAS J114637.9-001132 (hereinafter HATLAS12-00) using both archival Herschel data from the H-ATLAS survey and using submm data obtained with both LABOCA and SCUBA2. The lensed source is found to be surrounded by a strong overdensity of both Herschel-SPIRE…
Gas outflow and dust transport of comet 67P/Churyumov-Gerasimenko
Bertaux, Jean-Loup; Da Deppo, Vania; Naletto, Giampiero +46 more
Because of the diurnal thermal cycle and the irregular shape of the nucleus, gas outflow of comet 67P/Churyumov-Gerasimenko could be highly anisotropic as indicated by the colliminated dust jet structures on the sunlit side. Based on the OSIRIS imaging observations of the outgassing effect, a simple model of surface sublimation can be constructed …
The ISLANDS Project. I. Andromeda XVI, An Extremely Low Mass Galaxy Not Quenched by Reionization
McQuinn, Kristen B. W.; Dolphin, Andrew E.; Skillman, Evan D. +14 more
Based on data aquired in 13 orbits of Hubble Space Telescope time, we present a detailed evolutionary history of the M31 dSph satellite Andromeda XVI, including its lifetime star formation history (SFH), the spatial distribution of its stellar populations, and the properties of its variable stars. And XVI is characterized by prolonged star formati…
First simultaneous SST/CRISP and IRIS observations of a small-scale quiet Sun vortex
Doyle, J. G.; Scullion, E.; Tziotziou, K. +3 more
Context. Ubiquitous small-scale vortices have recently been found in the lower atmosphere of the quiet Sun in state-of-the-art solar observations and in numerical simulations.
Aims: We investigate the characteristics and temporal evolution of a granular-scale vortex and its associated upflows through the photosphere and chromosphere of a quie…
A mini outburst from the nightside of comet 67P/Churyumov-Gerasimenko observed by the OSIRIS camera on Rosetta
Jorda, L.; Lara, L. M.; Lamy, P. +40 more
Context. On 12 March 2015 the OSIRIS WAC camera onboard the ESA Rosetta spacecraft orbiting comet 67P/Churyumov-Gerasimenko observed a small outburst originating from the Imhotep region at the foot of the big lobe of the comet. These measurements are unique since it was the first time that the initial phase of a transient outburst event could be d…
Spectral Properties of Large Gradual Solar Energetic Particle Events. I. Fe, O, and Seed Material
Cohen, C. M. S.; Mewaldt, R. A.; Schwadron, N. A. +7 more
We have surveyed ∼0.1-100 MeV nucleon-1 O and Fe fluence spectra during 46 isolated, large gradual SEP events observed at ACE during solar cycles 23 and 24. Most SEP spectra are well represented by the four-parameter Band function with a normalization constant, low-energy spectral slope, high-energy spectral slope, and break energy. The…
NGC 6362: The Least Massive Globular Cluster with Chemically Distinct Multiple Populations
Dalessandro, Emanuele; Salaris, Maurizio; Mucciarelli, Alessio +6 more
We present the first measure of Fe and Na abundances in NGC 6362, a low-mass globular cluster (GC) where first- and second-generation stars are fully spatially mixed. A total of 160 member stars (along the red giant branch (RGB) and the red horizontal branch (RHB)) were observed with the multi-object spectrograph FLAMES at the Very Large Telescope…
Probing the 2D temperature structure of protoplanetary disks with Herschel observations of high-J CO lines
Fedele, D.; van Dishoeck, E. F.; Bruderer, S. +2 more
The gas temperature structure of protoplanetary disks is a key ingredient for interpreting various disk observations and for quantifying the subsequent evolution of these systems. The comparison of low- and mid-J CO rotational lines is a powerful tool for assessing the temperature gradient in the warm molecular layer of disks. Spectrally resolved …