Search Publications
Interstellar Dust Properties of M51 from AKARI Mid-infrared Images
Onaka, Takashi; Arimatsu, Ko; Matsuhara, Hideo +3 more
Using mid-infrared (MIR) images of four photometric bands of the Infrared Camera on board the AKARI satellite, S7 (7 µm), S11 (11 µm), L15 (15 µm), and L24 (24 µm), we investigate the interstellar dust properties of the nearby pair of galaxies M51 with respect to their spiral arm structure. The arm and interarm regions are …
Detecting exo-moons with photometric transit timing - I. Effect of realistic stellar noise
Lewis, Karen M.
The timing errors for individual planetary transits using the photometric transit timing technique (TTVp) are derived for light curves contaminated with either white additive noise, realistic stellar noise or filtered stellar noise. For the case of white noise, the timing errors are derived analytically, while timing errors for realisti…
2D and 3D Polar Plume Analysis from the Three Vantage Positions of STEREO/EUVI A, B, and SOHO/EIT
Feng, Li; Wiegelmann, Thomas; Inhester, Bernd +1 more
Polar plumes appear as elongated objects starting at the solar polar regions. Here we analyze these objects from a sequence of images taken simultaneously by the three spacecraft telescopes STEREO/EUVI A and B, and SOHO/EIT. We establish a method capable of automatically identifying plumes in solar EUV images close to the limb at 1.01 - 1.39 R
Ortho-to-Para Ratio in Interstellar Water on the Sightline toward Sagittarius B2(N)
Bergin, Edwin A.; van Dishoeck, Ewine F.; Lis, Dariusz C. +1 more
The determination of the water ortho-to-para ratio (OPR) is of great interest for studies of the formation and thermal history of water ices in the interstellar medium and protoplanetary disk environments. We present new Herschel observations of the fundamental rotational transitions of ortho- and para-water on the sightline toward Sagittarius B2(…
WMAP Observations of Planck ESZ Clusters
Hinshaw, Gary; Scott, Douglas; Ma, Yin-Zhe
We examine the Sunyaev-Zeldovich (SZ) effect in the seven year Wilkinson Microwave Anisotropy Probe (WMAP) data by cross-correlating it with the Planck Early-release Sunyaev-Zeldovich catalog. Our analysis proceeds in two parts. We first perform a stacking analysis in which the filtered WMAP data are averaged at the locations of the 175 Planck clu…
Spatial spreading of magnetospherically reflected chorus elements in the inner magnetosphere
Krasnoselskikh, V.; Breuillard, H.; Agapitov, O. +3 more
Chorus-type whistler waves are known to be generated in the vicinity of the magnetic equator, in the low-density plasma trough region. These wave packets propagate towards the magnetic poles, deviating from the magnetic field lines, before being eventually reflected at higher latitudes. Magnetospheric reflection of whistler waves results in bounce…
Current-voltage relation for the Saturnian system
Delamere, P. A.; Ray, L. C.; Galand, M. +1 more
Saturn's magnetosphere is populated by plasma created from neutrals ejected by the moon Enceladus. These neutrals are ionized and picked up by the planetary magnetic field requiring large amounts of angular momentum to be transferred from Saturn's upper atmosphere to the magnetospheric plasma. The resulting upward currents that supply this angular…
The host galaxy of the z = 2.4 radio-loud AGN MRC 0406-244 as seen by HST
Pentericci, L.; Röttgering, H. J. A.; Miley, G. K. +7 more
We present multicolour Hubble Space Telescope images of the powerful z = 2.4 radio galaxy MRC 0406-244 and model its complex morphology with several components including a host galaxy, a point source and extended nebular and continuum emission. We suggest that the main progenitor of this radio galaxy was a normal, albeit massive (M⋆ ∼ 1…
Helioseismology of sunspots: defocusing, folding, and healing of wavefronts
Gizon, L.; Schunker, H.; Liang, Z. -C. +1 more
We observe and characterize the scattering of acoustic wave packets by a sunspot in a regime where the wavelength is comparable to the size of the sunspot. Spatial maps of wave travel times and amplitudes are measured from the cross-covariance function of the random wave field observed by SOHO/MDI around the sunspot in active region NOAO 9787. We …
Solar activity and its evolution across the corona: recent advances
Vainio, Rami; Dudok de Wit, Thierry; Kretzschmar, Matthieu +15 more
Solar magnetism is responsible for the several active phenomena that occur in the solar atmosphere. The consequences of these phenomena on the solar-terrestrial environment and on Space Weather are nowadays clearly recognized, even if not yet fully understood. In order to shed light on the mechanisms that are at the basis of the Space Weather, it …