Search Publications
"TNOs are Cool": A survey of the trans-Neptunian region. XII. Thermal light curves of Haumea, 2003 VS2 and 2003 AZ84 with Herschel/PACS
Jorda, L.; Fornasier, S.; Groussin, O. +10 more
Context. Time series observations of the dwarf planet Haumea and the Plutinos 2003 VS2 and 2003 AZ84 with Herschel/PACS are presented in this work. Thermal emission of these trans-Neptunian objects (TNOs) were acquired as part of the "TNOs are Cool" Herschel Space Observatory key programme.
Aims: We search for the therma…
The Carnegie-Chicago Hubble Program: Discovery of the Most Distant Ultra-faint Dwarf Galaxy in the Local Universe
Lee, Myung Gyoon; Jang, In Sung; Seibert, Mark +3 more
Ultra-faint dwarf galaxies (UFDs) are the faintest known galaxies, and due to their incredibly low surface brightness, it is difficult to find them beyond the Local Group. We report a serendipitous discovery of a UFD, Fornax UFD1, in the outskirts of NGC 1316, a giant galaxy in the Fornax cluster. The new galaxy is located at a projected radius of…
Shock aurora: Field-aligned discrete structures moving along the dawnside oval
Zhou, Xiaoyan; Haerendel, Gerhard; Moen, Jøran I. +5 more
Generated by interplanetary shocks or solar wind pressure pulses, shock aurora has transient, global, and dynamic significances and provides a direct manifestation of the solar wind-magnetosphere-ionosphere interaction. As a part of a series of studies of the shock aurora, this paper focuses on the interaction at the morning magnetopause and its a…
HST Detection of Extended Neutral Hydrogen in a Massive Elliptical at z = 0.4
Zahedy, Fakhri S.; Chen, Hsiao-Wen; Rauch, Michael +1 more
We report the first detection of extended neutral hydrogen (H I) gas in the interstellar medium (ISM) of a massive elliptical galaxy beyond z∼ 0. The observations utilize the doubly lensed images of QSO HE 0047-1756 at {z}{QSO}=1.676 as absorption-line probes of the ISM in the massive ({M}{star}≈ {10}11 {M}⊙ <…
Insights on star-formation histories and physical properties of 1.2 ≤z ≲ 4 Herschel-detected galaxies
Elbaz, D.; Schaerer, D.; Pannella, M. +3 more
Aims: We aim to test the impact of using variable star-forming histories (SFHs) and the IR luminosity as a constrain on the physical parameters of high redshift dusty star-forming galaxies. We explore in particular the properties (SFHs, ages, timescales) of galaxies depending on their belonging to the "main sequence" of star-forming galaxies …
An isolated, bright cusp aurora at Saturn
Baines, K. H.; Dougherty, M. K.; Gray, R. L. +16 more
Saturn's dayside aurora displays a number of morphological features poleward of the main emission region. We present an unusual morphology captured by the Hubble Space Telescope on 14 June 2014 (day 165), where for 2 h, Saturn's FUV aurora faded almost entirely, with the exception of a distinct emission spot at high latitude. The spot remained fix…
Dawn-dusk difference of periodic oxygen EUV dayglow variations at Venus observed by Hisaki
Leblanc, François; Tsuchiya, Fuminori; Seki, Kanako +8 more
We report a dawn-dusk difference of periodic variations of oxygen EUV dayglow (OII 83.4 nm, OI 130.4 nm and OI 135.6 nm) in the upper atmosphere of Venus observed by the Hisaki spacecraft in 2015. Observations show that the periodic dayglow variations are mainly controlled by the solar EUV flux. Additionally, we observed characteristic ∼1 day and …
Is there another coincidence problem at the reionization epoch?
Lombriser, Lucas; Smer-Barreto, Vanessa
The cosmological coincidences between the matter and radiation energy densities at recombination as well as between the densities of matter and the cosmological constant at the present time are well known. We point out that, moreover, the third intersection between the energy densities of radiation and the cosmological constant coincides with the …
MAGIC observations of the microquasar V404 Cygni during the 2015 outburst
Maraschi, L.; Covino, S.; Antonelli, L. A. +143 more
The microquasar V404 Cygni underwent a series of outbursts in 2015, June 15-31, during which its flux in hard X-rays (20-40 keV) reached about 40 times the Crab nebula flux. Because of the exceptional interest of the flaring activity from this source, observations at several wavelengths were conducted. The MAGIC telescopes, triggered by the INTEGR…
CLUSIM: A Synthetic Aperture Radar Clutter Simulator for Planetary Exploration
Sánchez-Cano, B.; Witasse, O.; Orosei, R. +1 more
In this paper we present the CLUtter SIMulator (CLUSIM), a special program simulating radar side echoes from rough planetary surfaces using realistic topography data sets. A numerical model of realistic topography of the Martian surface, based on Mars Orbiter Laser Altimeter data, is developed. A specially developed computer routine for evaluation…