Search Publications
The science process for selecting the landing site for the 2020 Mars rover
Golombek, Matthew P.; Wilson, Sharon A.; Grant, John A. +3 more
The process of identifying the landing site for NASA's Mars 2020 rover began in 2013 by defining threshold mission science criteria related to seeking signs of ancient habitable conditions, searching for biosignatures of past microbial life, assembling a returnable cache of samples for possible future return to Earth, and collecting data for plann…
Baryon Budget of the Hot Circumgalactic Medium of Massive Spiral Galaxies
Bregman, Joel N.; Anderson, Michael E.; Crain, Robert A. +2 more
The baryon content around local galaxies is observed to be much less than is needed in Big Bang nucleosynthesis. Simulations indicate that a significant fraction of these “missing baryons” may be stored in a hot tenuous circumgalactic medium (CGM) around massive galaxies extending to or even beyond the virial radius of their dark matter halos. Pre…
Titan's Meteorology Over the Cassini Mission: Evidence for Extensive Subsurface Methane Reservoirs
Le Mouélic, S.; Rodriguez, S.; Sotin, C. +15 more
Cassini observations of Titan's weather patterns over >13 years, almost half a Saturnian year, provide insight into seasonal circulation patterns and the methane cycle. The Imaging Science Subsystem and the Visual and Infrared Mapping Spectrometer documented cloud locations, characteristics, morphologies, and behavior. Clouds were generally mor…
The Herschel-PACS Legacy of Low-mass Protostars: The Properties of Warm and Hot Gas Components and Their Origin in Far-UV Illuminated Shocks
Herczeg, Gregory J.; van Dishoeck, Ewine F.; Green, Joel D. +11 more
Recent observations from Herschel allow the identification of important mechanisms responsible both for the heating of the gas that surrounds low-mass protostars and for its subsequent cooling in the far-infrared. Shocks are routinely invoked to reproduce some properties of the far-IR spectra, but standard models fail to reproduce the emission fro…
The empirical Gaia G-band extinction coefficient
Arenou, F.; Babusiaux, C.; Sartoretti, P. +2 more
Context. The first Gaia data release unlocked the access to photometric information for 1.1 billion sources in the G-band. Yet, given the high level of degeneracy between extinction and spectral energy distribution for large passbands such as the Gaia G-band, a correction for the interstellar reddening is needed in order to exploit Gaia data.
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Simultaneous Chandra and VLA Observations of the Transitional Millisecond Pulsar PSR J1023+0038: Anti-correlated X-Ray and Radio Variability
Deller, Adam T.; Bogdanov, Slavko; Hessels, Jason W. T. +6 more
We present coordinated Chandra X-ray Observatory and Karl G. Jansky Very Large Array observations of the transitional millisecond pulsar PSR J1023+0038 in its low-luminosity accreting state. The unprecedented five hours of strictly simultaneous X-ray and radio continuum coverage for the first time unambiguously show a highly reproducible, anti-cor…
Solar cycle 24: An unusual polar field reversal
Janardhan, P.; Fujiki, K.; Ingale, M. +2 more
Context. It is well known that the polarity of the Sun's magnetic field reverses or flips around the maximum of each 11 year solar cycle. This is commonly known as polar field reversal and plays a key role in deciding the polar field strength at the end of a cycle, which is crucial for the prediction of the upcoming cycle.
Aims: We aim to inv…
Revealing the Environmental Dependence of Molecular Gas Content in a Distant X-Ray Cluster at z = 2.51
Kohno, Kotaro; Daddi, Emanuele; Koyama, Yusei +13 more
We present a census of the molecular gas properties of galaxies in the most distant known X-ray cluster, CLJ1001, at z = 2.51, using deep observations of CO(1-0) with the Karl G. Jansky Very Large Array. In total, 14 cluster members with M * > 1010.5 M ⊙ are detected, including all of the massive star-forming me…
The second-closest gamma-ray burst: sub-luminous GRB 111005A with no supernova in a super-solar metallicity environment
Gentile, Gianfranco; Paragi, Zsolt; Fynbo, Johan P. U. +17 more
We report the detection of the radio afterglow of a long gamma-ray burst (GRB) 111005A at 5-345 GHz, including very long baseline interferometry observations with a positional error of 0.2 mas. The afterglow position is coincident with the disc of a galaxy ESO 58049 at z = 0.01326 (∼1″ from its centre), which makes GRB 111005A the second-closest G…
Surround and Squash: the impact of superbubbles on the interstellar medium in Scorpius-Centaurus OB2
Roccatagliata, Veronica; Diehl, Roland; Siegert, Thomas +7 more
Context. Feedback by massive stars shapes the interstellar medium and is thought to influence subsequent star formation. The details of this process are under debate.
Aims: We exploited observational constraints on stars, gas, and nucleosynthesis ashes for the closest region with recent massive-star formation, Scorpius-Centaurus OB2, and comb…