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Detection of H I in Emission in the LYα Emitting Galaxy Haro 11
Cannon, John M.; Hayes, Matthew; Östlin, Göran +2 more
We present the first robust detection of H I 21 cm emission in the blue compact galaxy Haro 11 using the 100 m Robert C. Byrd Green Bank Telescope (GBT). Haro 11 is a luminous blue compact galaxy with emission in both Lyα and the Lyman continuum. We detect (5.1 ± 0.7 × 108) M ⊙ of H I gas at an assumed distance of 88 Mpc, mak…
Chandrayaan-2 dual-frequency SAR: Further investigation into lunar water and regolith
Das, Anup; Putrevu, Deepak; Vachhani, J. G. +2 more
The Space Applications Centre (SAC), one of the major centers of the Indian Space Research Organization (ISRO), is developing a high resolution, dual-frequency Synthetic Aperture Radar as a science payload on Chandrayaan-2, ISRO's second moon mission. With this instrument, ISRO aims to further the ongoing studies of the data from S-band MiniSAR on…
Herschel/HIFI observations of the circumstellar ammonia lines in IRC+10216
Menten, K. M.; Olofsson, H.; Marston, A. P. +14 more
Context. A discrepancy exists between the abundance of ammonia (NH3) derived previously for the circumstellar envelope (CSE) of
Aims: To address the discrepancy described above…
A Search for O2 in CO-depleted Molecular Cloud Cores with Herschel
Ceccarelli, Cecilia; Charnley, Steven B.; Cordiner, Martin A. +1 more
The general lack of molecular oxygen in molecular clouds is an outstanding problem in astrochemistry. Extensive searches with the Submillimeter Astronomical Satellite, Odin, and Herschel have only produced two detections; upper limits to the O2 abundance in the remaining sources observed are about 1000 times lower than predicted by chem…
Titan's surface spectra at the Huygens landing site and Shangri-La
Le Mouélic, S.; Sotin, C.; D'Aversa, E. +6 more
Titan is an icy satellite of Saturn with a dense atmosphere and covered by a global photochemical organic haze. Ground based observations and the Huygens descent probe allowed to retrieve the main spectral signature of the water ice (Griffith, C.A. et al. [2003]. Science 300(5619), 628-630; Coustenis, A. et al. [2005]. Icarus 177, 89-105) at the s…
Extinction law at a distance up to 25 kpc toward the Galactic poles
Gontcharov, G. A.
Photometry from the Tycho-2, 2MASS, andWISE catalogues for clump and branch giants at a distance up to 25 kpc toward the Galactic poles has allowed the variations of various characteristics of the infrared interstellar extinction law with distance to be analyzed. The results obtained by the extinction law extrapolation method are consistent for di…
Masses of the components of SB2s observed with Gaia - II. Masses derived from PIONIER interferometric observations for Gaia validation
Mazeh, T.; Grellmann, R.; Tal-Or, L. +15 more
In anticipation of the Gaia astrometric mission, a sample of spectroscopic binaries is being observed since 2010 with the Spectrograph pour l'Observation des PHénomènes des Intérieurs stellaires et des Exoplanètes (SOPHIE) spectrograph at the Haute-Provence Observatory. Our aim is to derive the orbital elements of double-lined spectroscopic binari…
Radial Distribution of ISM Gas-phase Metallicity in CLASH Clusters at z ~ 0.35: A New Outlook on Environmental Impact on Galaxy Evolution
Kewley, Lisa J.; Tran, Kim-Vy H.; Gupta, Anshu +3 more
We present the first observation of cluster-scale radial metallicity gradients from star-forming galaxies. We use DEIMOS on the Keck II telescope to observe two CLASH clusters at z ∼ 0.35: MACS J1115+0129 and RX J1532+3021. Based on our measured interstellar medium properties of star-forming galaxies out to a radius of 2.5 Mpc from the cluster cen…
IR excesses around nearby Lambda Boo stars are caused by debris discs rather than ISM bow waves
Wyatt, M. C.; Venn, K. A.; Matthews, B. C. +3 more
Lambda Boo stars are predominately A-type stars with solar abundant C, N, O, and S, but up to 2 dex underabundances of refractory elements. The stars' unusual surface abundances could be due to a selective accretion of volatile gas over dust. It has been proposed that there is a correlation between the Lambda Boo phenomenon and IR excesses which a…
Challenges associated with near-Earth nightside current
Liemohn, Michael W.; Welling, Daniel T.; Ilie, Raluca +1 more
Every magnetic field of solar and planetary space environments is associated with a current of differentially flowing charged particles. Electric potential patterns in geospace and near other planets are also closely linked with currents. Close to the Earth, particularly in the near-Earth nightside magnetosphere, several current systems wax and wa…