Search Publications
Star formation in the massive cluster merger Abell 2744
Okabe, N.; Altieri, B.; Valtchanov, I. +8 more
We present a comprehensive study of star-forming (SF) galaxies in the Hubble Space Telescope (HST) Frontier Field recent cluster merger A2744 (z = 0.308). Wide-field, ultraviolet-infrared (UV-IR) imaging enables a direct constraint of the total star formation rate (SFR) for 53 cluster galaxies, with SFRUV+IR = 343 ± 10 M⊙ yr<…
Evolution of the Fraction of Clumpy Galaxies at 0.2 < z < 1.0 in the COSMOS Field
Ilbert, O.; Taniguchi, Y.; Salvato, M. +7 more
Using the Hubble Space Telescope/Advanced Camera for Surveys data in the COSMOS field, we systematically searched clumpy galaxies at 0.2 < z < 1.0 and investigated the fraction of clumpy galaxies and its evolution as a function of stellar mass, star formation rate (SFR), and specific SFR (SSFR). The fraction of clumpy galaxies in star-formin…
Quantifying the BICEP2-Planck Tension over Gravitational Waves
Smith, Kendrick M.; Dvorkin, Cora; Boyle, Latham +4 more
The recent BICEP2 measurement of B-mode polarization in the cosmic microwave background (r =0.2-0.05+0.07), a possible indication of primordial gravity waves, appears to be in tension with the upper limit from WMAP (r<0.13 at 95% C.L.) and Planck (r <0.11 at 95% C.L.). We carefully quantify the level of tension and show that it is very signi…
Constraints for the Progenitor Masses of 17 Historic Core-collapse Supernovae
Dolphin, Andrew E.; Williams, Benjamin F.; Dalcanton, Julianne J. +4 more
Using resolved stellar photometry measured from archival Hubble Space Telescope imaging, we generate color-magnitude diagrams of the stars within 50 pc of the locations of historic core-collapse supernovae (SNe) that took place in galaxies within 8 Mpc. We fit these color-magnitude distributions with stellar evolution models to determine the best-…
The GEEC2 spectroscopic survey of Galaxy groups at 0.8 < z < 1
Mulchaey, John S.; Balogh, Michael L.; Finoguenov, Alexis +6 more
We present the data release of the Gemini-South GMOS spectroscopy in the fields of 11 galaxy groups at 0.8 < z < 1, within the COSMOS field. This forms the basis of the Galaxy Environment Evolution Collaboration 2 (GEEC2) project to study galaxy evolution in haloes with M ∼ 1013 M⊙ across cosmic time. The final sample i…
Spatially Resolving a Starburst Galaxy at Hard X-Ray Energies: NuSTAR, Chandra, and VLBA Observations of NGC 253
Argo, M. K.; Krivonos, R.; Wik, D. R. +16 more
Prior to the launch of NuSTAR, it was not feasible to spatially resolve the hard (E > 10 keV) emission from galaxies beyond the Local Group. The combined NuSTAR data set, comprised of three ~165 ks observations, allows spatial characterization of the hard X-ray emission in the galaxy NGC 253 for the first time. As a follow up to our initial stu…
A simulation study of the propagation of whistler-mode chorus in the Earth's inner magnetosphere
Katoh, Yuto
We study the propagation of whistler-mode chorus in the magnetosphere by a spatially two-dimensional simulation code in the dipole coordinates. We set the simulation system so as to assume the outside of the plasmapause, corresponding to the radial distance from 3.9 to 4.1 RE in the equatorial plane and the latitudinal range from ‑15° t…
Far-infrared molecular lines from low- to high-mass star forming regions observed with Herschel
Braine, J.; Fedele, D.; Contursi, A. +13 more
Aims: Our aim is to study the response of the gas-to-energetic processes associated with high-mass star formation and compare it with previously published studies on low- and intermediate-mass young stellar objects (YSOs) using the same methods. The quantified far-IR line emission and absorption of CO, H2O, OH, and [O i] reveals th…
The XXL Survey. V. Detection of the Sunyaev-Zel'dovich Effect of the Redshift 1.9 Galaxy Cluster XLSSU J021744.1-034536 with CARMA
Pierre, M.; Willis, J.; Adami, C. +14 more
We report the detection of the Sunyaev-Zel'dovich (SZ) effect of galaxy cluster XLSSU J021744.1-034536, using 30 GHz Combined Array for Research in Millimeter-wave Astronomy (CARMA) data. This cluster was discovered via its extended X-ray emission in the XMM- Newton Large Scale Structure survey, the precursor to the XXL survey. It has a photometri…
Martian satellite orbits and ephemerides
Lainey, V.; Jacobson, R. A.
We discuss the general characteristics of the orbits of the Martian satellites, Phobos and Deimos. We provide a concise review of the various descriptions of the orbits by both analytical theories and direct numerical integrations of their equations of motion. After summarizing the observational data used to determine the orbits, we discuss the re…