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Warm gas towards young stellar objects in Corona Australis. Herschel/PACS observations from the DIGIT key programme
Herczeg, Gregory J.; Evans, Neal J.; Green, Joel D. +5 more
Context. The effects of external irradiation on the chemistry and physics in the protostellar envelope around low-mass young stellar objects are poorly understood. The Corona Australis star-forming region contains the R CrA dark cloud, comprising several low-mass protostellar cores irradiated by an intermediate-mass young star.
Aims: We study…
Discovery of the Fomalhaut C debris disc
Duchêne, G.; Lestrade, J. -F.; Wyatt, M. C. +5 more
Fomalhaut is one of the most interesting and well-studied nearby stars, hosting at least one planet, a spectacular debris ring and two distant low-mass stellar companions (TW PsA and LP 876-10, a.k.a. Fomalhaut B and C). We observed both companions with Herschel, and while no disc was detected around the secondary, TW PsA, we have discovered the s…
Planck confirmation of the disk and halo rotation of M 31
Nucita, A. A.; De Paolis, F.; Ingrosso, G. +8 more
Planck data acquired during the first 15.4 months of observations toward both the disk and halo of the M 31 galaxy were analyzed. We confirm the temperature asymmetry that was previously detected by using the seven-year WMAP data in the direction of the rotation of M 31, which indicates that this is a Doppler-induced effect. The asymmetry extends …
The Distribution of Satellites around Massive Galaxies at 1 < z < 3 in ZFOURGE/CANDELS: Dependence on Star Formation Activity
Papovich, Casey; Ferguson, Henry C.; Koekemoer, Anton M. +23 more
We study the statistical distribution of satellites around star-forming and quiescent central galaxies at 1 < z < 3 using imaging from the FourStar Galaxy Evolution Survey and the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey. The deep near-IR data select satellites down to log (M/M ⊙) > 9 at z < 3. The radial sat…
Magnetic clouds and origins in STEREO era
Luhmann, J. G.; Kilpua, E. K. J.; Lynch, B. J. +1 more
When a coronal mass ejection (CME) encounters the Earth, the Earth's electromagnetic environment is disturbed, especially when it is a magnetic cloud (MC) with enhanced, steady, and long-lasting southward field. The speed and the magnetic field of an MC are the two important properties for its geoeffectiveness. The correspondence between a CME and…
A New Detection of LYα Absorption from the Heliotail
Redfield, Seth; Wood, Brian E.; Edelman, Eric +2 more
We present new Hubble Space Telescope observations of H I Lyα absorption toward the F8 V star HD 35296. This line of sight is only a few degrees from the downwind direction of the local interstellar medium flow vector. As a consequence, Lyα absorption from the heliotail is detected in the spectrum, consistent with three previous downwind detection…
XMM-Newton reveals a candidate period for the spin of the "Magnificent Seven" neutron star RX J1605.3+3249
Haberl, F.; Motch, C.; Zane, S. +3 more
Context. The group of seven thermally emitting isolated neutron stars (INSs) discovered by ROSAT and known as the "Magnificent Seven" (M7) is unique among the various neutron star populations. Crustal heating by means of magnetic field decay and an evolutionary link with magnetars may explain why these objects rotate more slowly and have higher th…
Infrared properties of blazars: putting the GASP-WEBT sources into context
Villata, M.; Carnerero, M. I.; Raiteri, C. M. +16 more
The infrared properties of blazars can be studied from the statistical point of view with the help of sky surveys, like that provided by the Wide-field Infrared Survey Explorer and the Two Micron All Sky Survey. However, these sources are known for their strong and unpredictable variability, which can be monitored for a handful of objects only. In…
Search for the Infrared Emission Features from Deuterated Interstellar Polycyclic Aromatic Hydrocarbons
Onaka, Takashi; Sakon, Itsuki; Kaneda, Hidehiro +4 more
We report the results of a search for emission features from interstellar deuterated polycyclic aromatic hydrocarbons (PAHs) in the 4 µm region with the Infrared Camera (IRC) on board AKARI. No significant excess emission is seen in 4.3-4.7 µm in the spectra toward the Orion Bar and M17 after the subtraction of line emission from the i…
Atomic data for astrophysics: Fe IX
Mason, H. E.; Del Zanna, G.; Storey, P. J. +1 more
We present the results of a new large-scale intermediate-coupling frame transformation R-matrix scattering calculation for electron collisional excitation of Fe ix. The target includes all the main configurations up to n = 5, to improve our earlier R-matrix and distorted-wave (DW) calculations for the n = 3,4 levels. Unlike similar calculations wh…