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Origin of Molecular Oxygen in Comets: Current Knowledge and Perspectives
Mousis, Olivier; Bouquet, Alexis; Lunine, Jonathan I. +10 more
The Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA) instrument onboard the Rosetta spacecraft has measured molecular oxygen (O2) in the coma of comet 67P/Churyumov-Gerasimenko (67P/C-G) in surprisingly high abundances. These measurements mark the first unequivocal detection of O2 in a cometary environment. …
Zodiacal Light Beyond Earth Orbit Observed with Pioneer 10
Matsumoto, T.; Pyo, J.; Tsumura, K. +1 more
We reanalyze the Imaging Photopolarimeter data from Pioneer 10 to study the zodiacal light in the B and R bands beyond Earth orbit, applying an improved method to subtract integrated star light (ISL) and diffuse Galactic light (DGL). We found that there exists a significant instrumental offset, making it difficult to examine the absolute sky brigh…
Comparing Chandra and Hubble in the Northern Disk of M31
Williams, Benjamin F.; Eracleous, Michael; Sasaki, Manami +9 more
The X-ray source populations within galaxies are typically difficult to identify and classify with X-ray data alone. We are able to break through this barrier by combining deep new Chandra ACIS-I observations with extensive Hubble Space Telescope (HST) imaging from the Panchromatic Hubble Andromeda Treasury of the M31 disk. We detect 373 X-ray sou…
The low-mass population of the Vela OB2 association from Gaia
Wright, Nicholas J.; Jeffries, R. D.; Armstrong, Joseph J.
The first Gaia Data Release presents an opportunity to characterize the low-mass population of OB associations, providing larger statistical samples and better constraints on the formation and evolution of clusters and associations. Using previously known low-mass members in a small region of Vela OB2, we have designed selection criteria that comb…
Galaxy Structure, Stellar Populations, and Star Formation Quenching at 0.6 ≲ z ≲ 1.2
Malhotra, Sangeeta; Pasquali, Anna; Joshi, Bhavin +3 more
We use both photometric and spectroscopic data from the Hubble Space Telescope to explore the relationships among 4000 Å break (D4000) strength, colors, stellar masses, and morphology, in a sample of 352 galaxies with log(M */M ⊙) > 9.44 at 0.6 ≲ z ≲ 1.2. We have identified authentically quiescent galaxies in the UVJ diagr…
ALMA Observations toward the Starburst Dwarf Galaxy NGC 5253. I. Molecular Cloud Properties and Scaling Relations
Bendo, George J.; Hirota, Akihiko; Nakanishi, Kouichiro +3 more
We present high-spatial-resolution (∼0.″2, or ∼3 pc) CO(2-1) observations of the nearest young starburst dwarf galaxy, NGC 5253, taken with the Atacama Large Millimeter/submillimeter Array. We have identified 118 molecular clouds with average values of 4.3 pc in radius and 2.2 km s-1 in velocity dispersion, which comprise the molecular …
Twin radio relics in the nearby low-mass galaxy cluster Abell 168
Kale, R.; Parekh, V.; Dwarakanath, K. S. +1 more
We report the discovery of twin radio relics in the outskirts of the low-mass merging galaxy cluster Abell 168 (redshift=0.045). One of the relics is elongated with a linear extent ∼800 kpc and projected width of ∼80 kpc and is located ∼900 kpc towards the north of the cluster centre, oriented roughly perpendicular to the major axis of the X-ray e…
Using Star Clusters as Tracers of Star Formation and Chemical Evolution: The Chemical Enrichment History of the Large Magellanic Cloud
Chilingarian, Igor V.; Asa'd, Randa
The star formation (SFH) and chemical enrichment (CEH) histories of Local Group galaxies are traditionally studied by analyzing their resolved stellar populations in a form of color-magnitude diagrams obtained with the Hubble Space Telescope. Star clusters can be studied in integrated light using ground-based telescopes to much larger distances. T…
HD 104860 and HD 192758: Two Debris Disks Newly Imaged in Scattered Light with the Hubble Space Telescope
Augereau, J. -C.; Bryden, G.; Mawet, D. +15 more
We present the first scattered-light images of two debris disks around the F8 star HD 104860 and the F0V star HD 192758, respectively ∼45 and ∼67 pc away. We detected these systems in the F110W and F160W filters through our reanalysis of archival Hubble Space Telescope (HST) NICMOS data with modern starlight-subtraction techniques. Our image of HD…
Space–time structure and wavevector anisotropy in space plasma turbulence
Narita, Yasuhito
Space and astrophysical plasmas often develop into a turbulent state and exhibit nearly random and stochastic motions. While earlier studies emphasize more on understanding the energy spectrum of turbulence in the one-dimensional context (either in the frequency or the wavenumber domain), recent achievements in plasma turbulence studies provide an…