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Carbon Abundances in Starburst Galaxies of the Local Universe
Leitherer, Claus; Wofford, Aida; Kewley, Lisa +2 more
The cosmological origin of carbon, the fourth most abundant element in the universe, is not well known and a matter of heavy debate. We investigate the behavior of C/O to O/H in order to constrain the production mechanism of carbon. We measured emission-line intensities in the spectral range from 1600 to 10000 Å on Space Telescope Imaging Spectrog…
Search for the warm-hot intergalactic medium around A 2744 using Suzaku
Finoguenov, Alexis; Akamatsu, Hiroki; Ota, Naomi +2 more
We present the results from Suzaku satellite observations of the surrounding region of a galaxy cluster, A 2744, at z = 0.3. To search for oxygen emission lines from the warm-hot intergalactic medium (WHIM), we analyzed X-ray spectra from two northeastern regions 2.2-3.3 and 3.3-4.4 Mpc from the center of the cluster, which offers the first test o…
VLBA Trigonometric Parallax Measurement of the Semi-regular Variable RT Vir
Menten, Karl M.; Honma, Mareki; Reid, Mark J. +4 more
We report a trigonometric parallax measurement of 22 GHz H2O masers toward the semi-regular variable RT Vir from multi-epoch Very Long Baseline Array observations. The parallax of 4.417 ± 0.134 mas, corresponding to a distance of 226 ± 7 pc, is significantly different from the Hipparcos parallax, but is consistent with a distance derive…
What is the Milky Way outer halo made of?. High resolution spectroscopy of distant red giants
Minniti, D.; Jablonka, P.; Starkenburg, E. +5 more
In a framework where galaxies form hierarchically, extended stellar haloes are predicted to be an ubiquitous feature around Milky Way-like galaxies and to consist mainly of the shredded stellar component of smaller galactic systems. The type of accreted stellar systems are expected to vary according to the specific accretion and merging history of…
Measurement of dust optical depth using the solar irradiance sensor (SIS) onboard the ExoMars 2016 EDM
Rannou, P.; Toledo, D.; Gómez, L. +5 more
The solar irradiance sensor (SIS) was included in the DREAMS package onboard the ExoMars 2016 Entry Descent and Landing Demonstrator Module, and has been selected in the METEO meteorological station onboard the ExoMars 2020 Lander. This instrument is designed to measure at different time intervals the scattered flux or the sum of direct flux and s…
Discovery of an H I-rich Gas Reservoir in the Outskirts of SZ-effect-selected Clusters
Nagai, Daisuke; Schaye, Joop; Muzahid, Sowgat +2 more
We report on the detection of three strong H I absorbers originating in the outskirts (I.e., impact parameter, {ρ }{cl} ≈ (1.6-4.7)r 500) of three massive ({M}500∼ 3× {10}14 M ⊙) clusters of galaxies at redshift {z}{cl}≈ 0.46, in the Hubble Space Telescope Cosmic Origins Spectrograp…
Observations of Lyα and O VI: Signatures of Cooling and Star Formation in a Massive Central Cluster Galaxy
Donahue, Megan; Voit, G. Mark; Connor, Thomas +1 more
We report new Hubble Space Telescope COS and Space Telescope Imaging Spectrograph spectroscopy of a star-forming region (∼ 100 {M}⊙ yr-1) in the center of the X-ray cluster RX J1532.9+3021 (z = 0.362), to follow-up the CLASH team discovery of luminous UV filaments and knots in the central massive galaxy. We detect broad (∼50…
Interchange Reconnection Associated with a Confined Filament Eruption: Implications for the Source of Transient Cold-dense Plasma in Solar Winds
Li, Gang; Chen, Yao; Zheng, Ruisheng +2 more
The cold-dense plasma is occasionally detected in the solar wind with in situ data, but the source of the cold-dense plasma remains illusive. Interchange reconnections (IRs) between closed fields and nearby open fields are known to contribute to the formation of solar winds. We present a confined filament eruption associated with a puff-like coron…
Bidirectional reflectance of laboratory cometary analogues to interpret the spectrophotometric properties of the nucleus of comet 67P/Churyumov-Gerasimenko
Thomas, Nicolas; Fornasier, Sonia; Pommerol, Antoine +5 more
In this work we provide measurements of the bidirectional reflectance in the VIS-NIR spectral range for a selection of laboratory samples to deduce parameters such as their visible spectrum, phase curve, hemispheric albedo and phase reddening. The aim is to simulate the reflectance of the comet nucleus in order to aid the interpretation of data fr…
Cometary coma dust size distribution from in situ IR spectra
Fulle, M.; Mottola, S.; D'Aversa, E. +16 more
Dust is the most abundant component in cometary comae. Here, we investigate the dust size distribution in 67P/Churyumov-Gerasimenko (67P/CG) using data from the Rosetta spacecraft that was in close proximity to the comet from 2014 August to 2016 September. The Visual, Infrared and Thermal Imaging Spectrometer (VIRTIS-M), spectral range of 0.25-5 &…