Search Publications
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…
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 …
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…
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…
Multiwavelength observation of a large-scale flux rope eruption above a kinked small filament
Kumar, Pankaj; Cho, Kyung-Suk
We analyzed multiwavelength observations of a western limb flare (C3.9) that occurred in AR NOAA 111465 on 30 April 2012. The high-resolution images recorded by SDO/AIA 304, 1600 Å and Hinode/SOT Hα show the activation of a small filament (rising speed ~40 km s-1) associated with a kink instability and the onset of a C-class flare near …
The long-period Galactic Cepheid RS Puppis. III. A geometric distance from HST polarimetric imaging of its light echoes
Szabados, L.; Kervella, P.; Anderson, R. I. +8 more
As one of the most luminous Cepheids in the Milky Way, the 41.5-day RS Puppis is an analog of the long-period Cepheids used to measure extragalactic distances. An accurate distance to this star would therefore help anchor the zero-point of the bright end of the period-luminosity relation. But, at a distance of about 2 kpc, RS Pup is too far away f…
Physical structure of the photodissociation regions in NGC 7023. Observations of gas and dust emission with Herschel
Abergel, A.; Teyssier, D.; Zavagno, A. +16 more
Context. The determination of the physical conditions in molecular clouds is a key step towards our understanding of their formation and evolution of associated star formation. We investigate the density, temperature, and column density of both dust and gas in the photodissociation regions (PDRs) located at the interface between the atomic and col…
A subarcsecond study of the hot molecular core in G023.01-00.41
Menten, K. M.; Sanna, A.; Molinari, S. +5 more
Context. Searching for disk-outflow systems in massive star-forming regions is a key to assessing the main physical processes in the recipe of massive star formation.
Aims: We have selected a hot molecular core (HMC) in the high-mass star-forming region G023.01-00.41, where VLBI multi-epoch observations of water and methanol masers have sugge…
Polycyclic aromatic hydrocarbon feature deficit of starburst galaxies in the AKARI North Ecliptic Pole Deep field
Inami, H.; Armus, L.; Serjeant, S. +6 more
We study the behaviour of polycyclic aromatic hydrocarbon (PAH) emission in galaxies at z = 0.3-1.4 using 1868 samples from the revised catalogue of AKARI North Ecliptic Pole Deep survey. The continuous filter coverage at 2-24 µm makes it possible to measure 8 µm luminosity, which is dominated by PAH emission, for galaxies at up to z =…
Pair separation of magnetic elements in the quiet Sun
Gošić, M.; Orozco Suárez, D.; Bellot Rubio, L. +5 more
The dynamic properties of the quiet Sun photosphere can be investigated by analyzing the pair dispersion of small-scale magnetic fields (i.e., magnetic elements). By using 25 h-long Hinode magnetograms at high spatial resolution (0.3 arcsec), we tracked 68 490 magnetic element pairs within a supergranular cell near the disk center. The computed pa…