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Ionospheric plasma of comet 67P probed by Rosetta at 3 au from the Sun
Wurz, P.; Altwegg, K.; Glassmeier, K. -H. +23 more
We propose to identify the main sources of ionization of the plasma in the coma of comet 67P/Churyumov-Gerasimenko at different locations in the coma and to quantify their relative importance, for the first time, for close cometocentric distances (<20 km) and large heliocentric distances (>3 au). The ionospheric model proposed is used as an …
The Age of the Young Bulge-like Population in the Stellar System Terzan 5: Linking the Galactic Bulge to the High-z Universe
Dalessandro, E.; Massari, D.; Rich, R. M. +4 more
The Galactic bulge is dominated by an old, metal-rich stellar population. The possible presence and the amount of a young (a few gigayears old) minor component is one of the major issues debated in the literature. Recently, the bulge stellar system Terzan 5 was found to harbor three sub-populations with iron content varying by more than one order …
The Distance to M51
Dolphin, Andrew E.; Skillman, Evan D.; Berg, Danielle +2 more
Great investments of observing time have been dedicated to the study of nearby spiral galaxies with diverse goals ranging from understanding the star formation process to characterizing their dark matter distributions. Accurate distances are fundamental to interpreting observations of these galaxies, yet many of the best studied nearby galaxies ha…
Far-infrared Line Spectra of Active Galaxies from the Herschel/PACS Spectrometer: The Complete Database
Spinoglio, Luigi; Fernández-Ontiveros, Juan Antonio; Malkan, Matthew A. +3 more
We present a coherent database of spectroscopic observations of far-IR fine-structure lines from the Herschel/Photoconductor Array Camera and Spectrometer archive for a sample of 170 local active galactic nuclei (AGNs), plus a comparison sample of 20 starburst galaxies and 43 dwarf galaxies. Published Spitzer/IRS and Herschel/SPIRE line fluxes are…
The SAMI Galaxy Survey: extraplanar gas, galactic winds and their association with star formation history
Kewley, Lisa J.; Kobayashi, Chiaki; Bland-Hawthorn, Joss +23 more
We investigate a sample of 40 local, main-sequence, edge-on disc galaxies using integral field spectroscopy with the Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey to understand the link between properties of the extraplanar gas and their host galaxies. The kinematics properties of the extraplanar gas, including velocity …
BAHAMAS: New Analysis of Type Ia Supernovae Reveals Inconsistencies with Standard Cosmology
van Dyk, David A.; Shariff, Hikmatali; Jiao, Xiyun +1 more
We present results obtained by applying our BAyesian HierArchical Modeling for the Analysis of Supernova cosmology (BAHAMAS) software package to the 740 spectroscopically confirmed supernovae of type Ia (SNe Ia) from the “Joint Light-curve Analysis” (JLA) data set. We simultaneously determine cosmological parameters and standardization parameters,…
An Iron K Component to the Ultrafast Outflow in NGC 1313 X-1
Harrison, F. A.; Stern, D.; Fabian, A. C. +8 more
We present the detection of an absorption feature at E={8.77}-0.06+0.05 keV in the combined X-ray spectrum of the ultraluminous X-ray source NGC 1313 X-1 observed with XMM-Newton and NuSTAR, significant at the 3σ level. If associated with blueshifted ionized iron, the implied outflow velocity is ∼0.2c for Fe xxvi, or ∼0.25c f…
Structure and evolution of the diamagnetic cavity at comet 67P/Churyumov-Gerasimenko
Nilsson, H.; Eriksson, A.; Sierks, H. +13 more
The long duration of the Rosetta mission allows us to study the evolution of the diamagnetic cavity at comet 67P/Churyumov-Gerasimenko in detail. From 2015 April to 2016 February 665 intervals could be identified where Rosetta was located in a zero-magnetic-field region. We study the temporal and spatial distribution of this cavity and its boundar…
ALMA observations of cold molecular gas filaments trailing rising radio bubbles in PKS 0745-191
O'Connell, R. W.; Fabian, A. C.; Combes, F. +16 more
We present ALMA observations of the CO(1-0) and CO(3-2) line emission tracing filaments of cold molecular gas in the central galaxy of the cluster PKS 0745-191. The total molecular gas mass of 4.6± 0.3× 109 M_{⊙}, assuming a Galactic XCO factor, is divided roughly equally between three filaments each extending radially 3-5 kp…
The MOSDEF Survey: Dynamical and Baryonic Masses and Kinematic Structures of Star-forming Galaxies at 1.4 ≤ z ≤ 2.6
Barro, Guillermo; Siana, Brian; Shapley, Alice E. +11 more
We present {{H}}α gas kinematics for 178 star-forming galaxies at z∼ 2 from the MOSFIRE Deep Evolution Field survey. We have developed models to interpret the kinematic measurements from fixed-angle multi-object spectroscopy, using structural parameters derived from Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey Hubble Space Telesc…