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A new observational solar irradiance composite
Schmutz, Werner; Haberreiter, Margit; Schöll, Micha +4 more
Variations in the solar spectral irradiance (SSI) are an important driver of the chemistry, temperature, and dynamics of the Earth's atmosphere and ultimately the Earth's climate. To investigate the detailed response of the Earth's atmosphere to SSI variations, a reliable SSI data set is needed. We present an observational SSI composite data set t…
ALMA Observations of Starless Core Substructure in Ophiuchus
Di Francesco, J.; Sadavoy, S. I.; Johnstone, D. +11 more
Compact substructure is expected to arise in a starless core as mass becomes concentrated in the central region likely to form a protostar. Additionally, multiple peaks may form if fragmentation occurs. We present Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 2 observations of 60 starless and protostellar cores in the Ophiuchus molecul…
Space Motions of the Dwarf Spheroidal Galaxies Draco and Sculptor Based on HST Proper Motions with a ∼10 yr Time Baseline
van der Marel, Roeland P.; van de Ven, Glenn; Bellini, Andrea +6 more
We present new proper motion (PM) measurements of the dwarf spheroidal galaxies (dSphs) Draco and Sculptor using multiepoch images obtained with the Hubble Space Telescope ACS/WFC. Our PM results have uncertainties far lower than previous measurements, even those made with the same instrument. The PM results for Draco and Sculptor are ({µ }<…
The late-time light curve of the Type Ia supernova SN 2011fe
Gal-Yam, A.; Sullivan, M.; Nugent, P. +10 more
We present late-time optical R-band imaging data from the Palomar Transient Factory (PTF) for the nearby Type Ia supernova SN 2011fe. The stacked PTF light curve provides densely sampled coverage down to R ≃ 22 mag over 200-620 d past explosion. Combining with literature data, we estimate the pseudo-bolometric light curve for this event from 200 t…
The independent pulsations of Jupiter's northern and southern X-ray auroras
Coates, A. J.; Jackman, C. M.; Jones, G. H. +14 more
Auroral hot spots are observed across the Universe at different scales1 and mark the coupling between a surrounding plasma environment and an atmosphere. Within our own Solar System, Jupiter possesses the only resolvable example of this large-scale energy transfer. Jupiter's northern X-ray aurora is concentrated into a hot spot, which i…
Improvement of solar-cycle prediction: Plateau of solar axial dipole moment
Kusano, K.; Shiota, D.; Imada, S. +2 more
Aims: We report the small temporal variation of the axial dipole moment near the solar minimum and its application to the solar-cycle prediction by the surface flux transport (SFT) model.
Methods: We measure the axial dipole moment using the photospheric synoptic magnetogram observed by the Wilcox Solar Observatory (WSO), the ESA/NASA So…
Diagnosing galactic feedback with line broadening in the low-redshift Lyα forest
Viel, Matteo; Wakker, Bart P.; Kim, Tae-Sun +4 more
We compare the low-redshift (z ≃ 0.1) Lyα forest from hydrodynamical simulations with data from the Cosmic Origins Spectrograph. We find the tension between the observed number of lines with b-parameters in the range of 25-45 km s-1 and the predictions from simulations that incorporate either vigorous feedback from active galactic nucle…
Super-Eddington QSO RX J0439.6-5311 - II. Multiwavelength constraints on the global structure of the accretion flow
Done, Chris; Ward, Martin; Jin, Chichuan +1 more
We present a detailed multiwavelength study of an unobscured, highly super-Eddington Type-1 QSO RX J0439.6-5311. We combine the latest XMM-Newton observation with all archival data from infrared to hard X-rays. The optical spectrum is very similar to that of 1H 0707-495 in having extremely weak [O III] and strong Fe II emission lines, although the…
Complexes of triggered star formation in supergiant shell of Holmberg II
Egorov, Oleg V.; Lozinskaya, Tatiana A.; Moiseev, Alexei V. +1 more
We report a detailed analysis of all regions of current star formation in the walls of the supergiant H I shell (SGS) in the galaxy Holmberg II based on observations with a scanning Fabry-Perot interferometer at the Russian 6-m telescope. We compare the structure and kinematics of ionized gas with that of atomic hydrogen and with the stellar popul…
The large-scale nebular pattern of a superwind binary in an eccentric orbit
Morris, Mark R.; Liu, Sheng-Yuan; Taam, Ronald E. +5 more
Preplanetary nebulae and planetary nebulae are evolved, mass-losing stellar objects that show a wide variety of morphologies. Many of these nebulae consist of outer structures that are nearly spherical (spiral/shell/arc/halo) and inner structures that are highly asymmetric (bipolar/multipolar) 1,2 . The coexistence of such geometrically…