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Interferometric observations of warm deuterated methanol in the inner regions of low-mass protostars
Codella, C.; Bianchi, E.; Ceccarelli, C. +7 more
Methanol is a key species in astrochemistry because it is the most abundant organic molecule in the interstellar medium and is thought to be the mother molecule of many complex organic species. Estimating the deuteration of methanol around young protostars is of crucial importance because it highly depends on its formation mechanisms and the physi…
The Role of Major Mergers and Nuclear Star Formation in Nearby Obscured Quasars
Ho, Luis C.; Zhao, Dongyao; Kim, Minjin +2 more
We investigate the triggering mechanism and the structural properties of obscured luminous active galactic nuclei from a detailed study of the rest-frame B and I Hubble Space Telescope images of 29 nearby (z ≈ 0.04-0.4) optically selected type 2 quasars. Morphological classification reveals that only a minority (34%) of the hosts are mergers or in…
Tidal Destruction in a Low-mass Galaxy Environment: The Discovery of Tidal Tails around DDO 44
Forbes, Duncan A.; Romanowsky, Aaron J.; Strader, Jay +10 more
We report the discovery of a ≳1° (∼50 kpc) long stellar tidal stream emanating from the dwarf galaxy DDO 44, a likely satellite of Local Volume galaxy NGC 2403 located ∼70 kpc in projection from its companion. NGC 2403 is a roughly Large Magellanic Cloud (LMC) stellar-mass galaxy 3 Mpc away, residing at the outer limits of the M81 group. We are ma…
Modeling the Multiple CME Interaction Event on 6-9 September 2017 with WSA-ENLIL+Cone
Temmer, M.; Dimmock, A. P.; Yordanova, E. +1 more
A series of coronal mass ejections (CMEs) erupted from the same active region between 4-6 September 2017. Later, on 6-9 September, two interplanetary (IP) shocks reached L1, creating a complex and geoeffective plasma structure. To understand the processes leading up to the formation of the two shocks, we model the CMEs with the Wang-Sheeley-Arge (…
ALMA Spatially Resolved Dense Molecular Gas Survey of Nearby Ultraluminous Infrared Galaxies
Imanishi, Masatoshi; Izumi, Takuma; Nakanishi, Kouichiro
We present the results of our Atacama Large Millimeter Array HCN J = 3-2 and HCO+ J = 3-2 line observations of a uniformly selected sample (>25) of nearby ultraluminous infrared galaxies (ULIRGs) at z < 0.15. The emission of these dense molecular gas tracers and continuum are spatially resolved in the majority of observed ULIRGs f…
Surface Morphology of Comets and Associated Evolutionary Processes: A Review of Rosetta's Observations of 67P/Churyumov-Gerasimenko
Keller, H. U.; Mottola, S.; Pajola, M. +7 more
Comets can be regarded as active planetary bodies because they display evidence for nearly all fundamental geological processes, which include impact cratering, tectonism, and erosion. Comets also display sublimation-driven outgassing, which is comparable to volcanism on larger planetary bodies in that it provides a conduit for delivering material…
Direct Estimates of the Solar Coronal Magnetic Field Using Contemporaneous Extreme-ultraviolet, Radio, and White-light Observations
Kumari, Anshu; Ramesh, R.; Kathiravan, C. +2 more
We report a solar coronal split-band type II radio burst that was observed on 2016 March 16 with the Gauribidanur Radio Spectro-Polarimeter in the frequency range ≈90-50 MHz, and the Gauribidanur RadioheliograPH at two discrete frequencies, viz. 80 and 53.3 MHz. Observations around the same epoch in extreme ultraviolet (EUV) and white light show t…
Two sub-millimetre bright protoclusters bounding the epoch of peak star-formation activity
Ivison, R. J.; Smail, Ian; Gurwell, M. +8 more
We present James Clerk Maxwell Telescope Submillimetre Common-User Bolometer Array 2 (SCUBA-2) 850 and 450 µm observations (σ850 ∼ 0.5 mJy, σ450 ∼ 5 mJy) of the HS1549+19 and HS1700+64 survey fields containing two of the largest known galaxy overdensities at z = 2.85 and 2.30, respectively. We detect 56 sub-millimetre g…
Challenging a Newtonian prediction through Gaia wide binaries
Scarpa, R.; Hernandez, X.; Allen, Christine +1 more
Under Newtonian dynamics, the relative motion of the components of a binary star should follow a Keplerian scaling with separation. Once orientation effects and a distribution of ellipticities are accounted for, dynamical evolution can be modeled to include the effects of Galactic tides and stellar mass perturbers, over the lifetime of the solar n…
TESS exoplanet candidates validated with HARPS archival data. A massive Neptune around GJ 143 and two Neptunes around HD 23472
Trifonov, Trifon; Kürster, Martin; Rybizki, Jan
Aims: We aim at the discovery of new planetary systems by exploiting the transit light-curve results from observations made in TESS orbital observatory Sectors 1 and 2 and validating them with precise Doppler measurements obtained from archival HARPS data.
Methods: Taking advantage of the reported TESS transit events around GJ 143 (TOI 1…