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In and out star formation in z 1.5 quiescent galaxies from rest-frame UV spectroscopy and the far-infrared
Cimatti, A.; Daddi, E.; Béthermin, M. +18 more
We present a sample of 34 spectroscopically confirmed BzK-selected 1011M⊙ quiescent galaxies (pBzK) in the COSMOS field. The targets were initially observed with VIMOS on the VLT to facilitate the calibration of the photometric redshifts of massive galaxies at z ≳ 1.5. Here we describe the reduction and analysis of the data, …
Understanding Problem Forecasts of ISEST Campaign Flare-CME Events
Nitta, Nariaki; Webb, David
The goal of the International Study of Earth-affecting Solar Transients (ISEST) project as part of the Variability of the Sun and Its Terrestrial Impact (VarSITI) program is to understand the origin, evolution, and propagation of solar transients through the space between the Sun and Earth, and to improve our prediction capability for space weathe…
The Optical-Mid-infrared Extinction Law of the l = 165° Sightline in the Galactic Plane: Diversity of the Extinction Law in the Diffuse Interstellar Medium
Wang, Shu; de Grijs, Richard; Zhao, He +2 more
Understanding the effects of dust extinction is important to properly interpret observations. The optical total-to-selective extinction ratio, {R}V={A}V/E(B-V), is widely used to describe extinction variations in ultraviolet and optical bands. Since the {R}V=3.1 extinction curve adequately represents the average ex…
Plasma Environment around Comet 67P/Churyumov-Gerasimenko at Perihelion: Model Comparison with Rosetta Data
Altwegg, K.; Goetz, C.; Goldstein, R. +6 more
The plasma environment near comet 67P/Churyumov-Gerasimenko (67P/CG) is dynamically affected by various factors, including the incident solar wind and outgassing from the nucleus. The Rosetta spacecraft MAGnetometer (MAG) instrument observations near perihelion showed crossing events into a magnetic field-free region at about 170 km from the nucle…
Revision of Stellar Intrinsic Colors in the Infrared by Spectroscopic Surveys
Jiang, Biwei; Zhao, He; Gao, Shuang +1 more
Intrinsic colors of normal stars are derived in the popularly used infrared bands involving the Two Micron All-Sky Survey/JHKS, Wide-field Infrared Survey Explorer, Spitzer/IRAC, and AKARI/S9W filters. Based on three spectroscopic surveys—LAMOST, RAVE, and APOGEE, stars are classified into groups of giants and dwarfs, as well as metal-n…
Geomorphology of comet 67P/Churyumov-Gerasimenko
Soderblom, J. M.; Sierks, H.; Vincent, J. -B. +10 more
We present a global geomorphological map of comet 67P/Churyumov-Gerasimenko (67P/C-G) using data acquired by the Rosetta Orbiter's OSIRIS Narrow Angle Camera. The images used in our study were acquired between 2014 August and 2015 May, before 67P/C-G passed through perihelion. Imagery of the Southern hemisphere was included in our study, allowing …
Quasilinear analysis of saturation properties of broadband whistler mode waves
Chen, L.; Liu, X.; Wang, S. +2 more
Saturation properties of parallel propagating broadband whistler mode waves are investigated using quasilinear theory. By assuming that the electron distribution stays bi-Maxwellian, we combine the previously obtained energy equation of quasilinear theory with wave equation to self-consistently model the excitation of broadband whistler waves. The…
The Hard X-Ray Emission of the Blazar PKS 2155-304
Misra, R.; Dewangan, G. C.; Gaur, Haritma +4 more
The synchrotron peak of the X-ray bright High Energy Peaked Blazar PKS 2155-304 occurs in the UV-EUV region and hence its X-ray emission (0.6-10 keV) lies mostly in the falling part of the synchrotron hump. We aim to study the X-ray emission of PKS 2155-304 during different intensity states in 2009-2014 using the XMM-Newton satellite. We studied t…
Herschel survey and modelling of externally-illuminated photoevaporating protoplanetary disks
Kamp, I.; Le Petit, F.; Goicoechea, J. R. +5 more
Context. Protoplanetary disks undergo substantial mass-loss by photoevaporation, a mechanism that is crucial to their dynamical evolution. However, the processes regulating the gas energetics have not so far been well constrained by observations.
Aims: We aim to study the processes involved in disk photoevaporation when it is driven by far-UV…
Deep HST Imaging in 47 Tucanae: A Global Dynamical Model
Anderson, J.; Heyl, J.; Kalirai, J. +3 more
Multi-epoch observations with the Advanced Camera Survey and WFC3 on the Hubble Space Telescope provide a unique and comprehensive probe of stellar dynamics within 47 Tucanae. We confront analytic models of the globular cluster with the observed stellar proper motions that probe along the main sequence from just above 0.8-0.1M ⊙ as well…