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Self-calibration of BICEP1 three-year data and constraints on astrophysical polarization rotation
Ade, P. A. R.; Bock, J. J.; Chiang, H. C. +33 more
Cosmic microwave background (CMB) polarimeters aspire to measure the faint B-mode signature predicted to arise from inflationary gravitational waves. They also have the potential to constrain cosmic birefringence, rotation of the polarization of the CMB arising from parity-violating physics, which would produce nonzero expectation values for the C…
The VLT-FLAMES Tarantula Survey. XIII: On the nature of O Vz stars in 30 Doradus
Herrero, A.; Simón-Díaz, S.; Puls, J. +13 more
Context. O Vz stars, a subclass of O-type dwarfs characterized by having He ii λ4686 stronger in absorption than any other helium line in their blue-violet spectra, have been suggested to be on or near the zero-age main sequence (ZAMS). If their youth were confirmed, they would be key objects with which to advance our knowledge of the physical pro…
Star Formation Rates from [C II] 158 µm and Mid-infrared Emission Lines for Starbursts and Active Galactic Nuclei
Lebouteiller, V.; Sargsyan, L.; Samsonyan, A. +5 more
A summary is presented for 130 galaxies observed with the Herschel Photodetector Array Camera and Spectrometer instrument to measure fluxes for the [C II] 158 µm emission line. Sources cover a wide range of active galactic nucleus to starburst classifications, as derived from polycyclic aromatic hydrocarbon strength measured with the Spitzer…
Optical Spectroscopic Observations of Blazars and γ-Ray Blazar Candidates in the Sloan Digital Sky Survey Data Release Nine
Masetti, N.; Funk, S.; Massaro, F. +2 more
We present an analysis of the optical spectra available in the Sloan Digital Sky Survey data release nine (SDSS DR9) for the blazars listed in the ROMA-BZCAT and for the γ-ray blazar candidates selected according to their IR colors. First, we adopt a statistical approach based on Monte Carlo simulations to find the optical counterparts of the blaz…
Methane depletion in both polar regions of Uranus inferred from HST/STIS and Keck/NIRC2 observations
Sromovsky, L. A.; Fry, P. M.; Karkoschka, E. +3 more
From Space Telescope Imaging Spectrograph (STIS) observations of Uranus in 2012, when good views of its north polar regions were available, we found that the methane volume mixing ratio declined from about 4% at low latitudes to about 2% at 60-80°N. This depletion in the north polar region of Uranus in 2012 is similar in magnitude and depth to tha…
A Solar Type II Radio Burst from Coronal Mass Ejection-Coronal Ray Interaction: Simultaneous Radio and Extreme Ultraviolet Imaging
Feng, Li; Li, Gang; Chen, Yao +5 more
Simultaneous radio and extreme ultraviolet (EUV)/white-light imaging data are examined for a solar type II radio burst occurring on 2010 March 18 to deduce its source location. Using a bow-shock model, we reconstruct the three-dimensional EUV wave front (presumably the type-II-emitting shock) based on the imaging data of the two Solar TErrestrial …
Accelerated post-AGB evolution, initial-final mass relations, and the star-formation history of the Galactic bulge
Zijlstra, A. A.; Hajduk, M.; Gesicki, K. +1 more
Aims: We study the star-formation history of the Galactic bulge, as derived from the age distribution of the central stars of planetary nebulae that belong to this stellar population.
Methods: The high resolution imaging and spectroscopic observations of 31 compact planetary nebulae are used to derive their central star masses. We use th…
The Herschel Exploitation of Local Galaxy Andromeda (HELGA). IV. Dust scaling relations at sub-kpc resolution
Blommaert, J. A. D. L.; Ciesla, L.; Boquien, M. +18 more
Context. Dust and stars play a complex game of interactions in the interstellar medium and around young stars. The imprints of these processes are visible in scaling relations between stellar characteristics, star formation parameters, and dust properties.
Aims: In the present work, we aim to examine dust scaling relations on a sub-kpc resolu…
Planck intermediate results. XIV. Dust emission at millimetre wavelengths in the Galactic plane
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +192 more
We use Planck HFI data combined with ancillary radio data to study the emissivity index of the interstellar dust emission in the frequency range 100-353 GHz, or 3-0.8 mm, in the Galactic plane. We analyse the region l = 20°-44° and |b| ≤ 4° where the free-free emission can be estimated from radio recombination line data. We fit the spectra at each…
Hubble Space Telescope/Cosmic Origins Spectrograph Observations of the Quasar Q0302-003: Probing the He II Reionization Epoch and QSO Proximity Effects
Shull, J. Michael; Syphers, David
Q0302-003 (z = 3.2860 ± 0.0005) was the first quasar discovered that showed a He II Gunn-Peterson trough, a sign of incomplete helium reionization at z >~ 2.9. We present its Hubble Space Telescope/Cosmic Origins Spectrograph far-UV medium-resolution spectrum, which resolves many spectral features for the first time, allowing study of the quasa…