Search Publications
Rosetta lander Philae: Flight Dynamics analyses for landing site selection and post-landing operations
Vincent, Jean-Baptiste; Kofman, Wlodek; Herique, Alain +20 more
On the 12th of November 2014, The Rosetta Lander Philae became the first spacecraft to softly land on a comet nucleus. Due to the double failure of the cold gas hold-down thruster and the anchoring harpoons that should have fixed Philae to the surface, it spent approximately two hours bouncing over the comet surface to finally come at rest one km …
Ultraviolet Halos around Spiral Galaxies. I. Morphology
Bregman, Joel N.; Hodges-Kluck, Edmund; Cafmeyer, Julian
We examine ultraviolet halos around a sample of highly inclined galaxies within 25 Mpc to measure their morphology and luminosity. Despite contamination from galactic light scattered into the wings of the point-spread function, we find that ultraviolet (UV) halos occur around each galaxy in our sample. Around most galaxies the halos form a thick, …
Dust Attenuation of the Nebular Regions of z ~ 2 Star-forming Galaxies: Insight from UV, IR, and Emission Lines
De Barros, S.; Reddy, N.; Shivaei, I.
We use a sample of 149 spectroscopically confirmed UV-selected galaxies at z ∼ 2 to investigate the relative dust attenuation of the stellar continuum and the nebular emission lines. For each galaxy in the sample, at least one rest-frame optical emission line (Hα/[N II] λ6583 or [O III] λ5007) measurement has been taken from the litterature, and 4…
Estimating the strength of the nucleus material of comet 67P Churyumov-Gerasimenko
Keller, H. U.; Mottola, S.; Hviid, S. F. +5 more
Consideration is given to the estimates for the strength of the consolidated material forming the bulk of the nucleus of comet 67P Churyumov-Gerasimenko and those for the strength of the surface material overlying the consolidated material at the sites of the first and last contact of the Philae lander with the nucleus. The strength of the consoli…
Access of energetic particles to Titan's exobase: A study of Cassini's T9 flyby
Coates, A. J.; Krupp, N.; Dougherty, M. K. +6 more
We study how the local electromagnetic disturbances introduced by Titan affect the ionization rates of the atmosphere. For this, we model the precipitation of energetic particles, specifically hydrogen and oxygen ions with energies between 1 keV and 1 MeV, into Titan's exobase for the specific magnetospheric configuration of the T9 flyby. For the …
Cosmic constraint on massive neutrinos in viable f(R) gravity with producing Λ
Yang, Weiqiang; Wu, Yabo; Wang, Yan +2 more
Tensions between several cosmic observations were found recently, such as the inconsistent values of
Comet 322P/SOHO 1: An Asteroid with the Smallest Perihelion Distance?
Snodgrass, Colin; Knight, Matthew M.; Kelley, Michael S. P. +1 more
We observed comet 322P/SOHO 1 (P/1999 R1) from the ground and with the Spitzer Space Telescope when it was between 2.2 and 1.2 au from the Sun. These are the first observations of any Solar and Heliospheric Observatory (SOHO)-discovered periodic comet by a non-solar observatory and allow us to investigate its behavior under typical cometary circum…
Starburst galaxies in the COSMOS field: clumpy star-formation at redshift 0 < z < 0.5
Muñoz-Tuñón, C.; Méndez-Abreu, J.; Hinojosa-Goñi, R.
Context. At high redshift, starburst galaxies present irregular morphologies with 10-20% of their star formation occurring in giant clumps. These clumpy galaxies are considered the progenitors of local disk galaxies. To understand the properties of starbursts at intermediate and low redshift, it is fundamental to track their evolution and the poss…
Quasar host environments: The view from Planck
Palanque-Delabrouille, Nathalie; Yèche, Christophe; Magneville, Christophe +3 more
We measure the far-infrared emission of the general quasar (QSO) population using Planck observations of the Baryon Oscillation Spectroscopic Survey QSO sample. By applying multi-component matched multi-filters to the seven highest Planck frequencies, we extract the amplitudes of dust, synchrotron, and thermal Sunyaev-Zeldovich (SZ) signals for ne…
Dense Gas in Molecular Cores Associated with Planck Galactic Cold Clumps
Liu, Hong-Li; Liu, Tie; Yuan, Jinghua +7 more
We present the first survey of dense gas toward Planck Galactic Cold Clumps (PGCCs). Observations in the J = 1-0 transitions of HCO+ and HCN toward 621 molecular cores associated with PGCCs were performed using the Purple Mountain Observatory’s 13.7 m telescope. Among them, 250 sources were detected, including 230 cores detected in HCO<…