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Depth of a strong jovian jet from a planetary-scale disturbance driven by storms
Hueso, R.; Sánchez-Lavega, A.; Rojas, J. F. +22 more
The atmospheres of the gas giant planets (Jupiter and Saturn) contain jets that dominate the circulation at visible levels. The power source for these jets (solar radiation, internal heat, or both) and their vertical structure below the upper cloud are major open questions in the atmospheric circulation and meteorology of giant planets. Several ob…
A deep X-ray observation of M82 with XMM-Newton
Maiolino, R.; Ranalli, P.; Comastri, A. +1 more
We report on the analysis of a deep (100-ks) observation of the starburst galaxy M82 with the EPIC and RGS instruments onboard the X-ray telescope XMM-Newton. The broad-band (0.5-10 keV) emission is due to at least three spectral components: (i) continuum emission from point sources; (ii) thermal plasma emission from hot gas; and (iii) charge-exch…
The Nature and Origin of Substructure in the Outskirts of M31. I. Surveying the Stellar Content with the Hubble Space Telescope Advanced Camera for Surveys
Chapman, S. C.; Tanvir, N. R.; Ferguson, A. M. N. +8 more
We present the largest and most detailed survey to date of the stellar populations in the outskirts of M31 based on the homogeneous analysis of 14 deep Hubble Space Telescope Advanced Camera for Surveys (HST/ACS) pointings spanning the range 11.5 kpc lsim R proj lsim 45 kpc. Many of these pointings sample coherent substructure discovere…
The Detection of a Light Echo from the Type Ia Supernova 2006X in M100
Filippenko, Alexei V.; Foley, Ryan J.; Smith, Nathan +3 more
We report the discovery of a light echo (LE) from the Type Ia supernova (SN) 2006X in the nearby galaxy M100. The presence of the LE is supported by analysis of both the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) images and the Keck optical spectrum that we obtained at ~300 days after maximum brightness. In the image procedure,…
Globular clusters in the outer halo of M31: the survey
Tanvir, N. R.; Ferguson, A. M. N.; Lewis, G. F. +4 more
We report the discovery of 40 new globular clusters (GCs) that have been found in surveys of the halo of M31 based on the Isaac Newton Telescope/Wide-Field Camera and Canada-France-Hawaii Telescope/Megacam imagery. A subset of these new GCs are of an extended, diffuse nature and include those already found in Huxor et al. The search strategy is de…
Blue Straggler Stars in the Unusual Globular Cluster NGC 6388
Dalessandro, E.; Valenti, E.; Piotto, G. +4 more
We have used multiband high-resolution HST WFPC2 and ACS observations combined with wide-field ground-based observations to study the blue straggler star (BSS) population in the Galactic globular cluster NGC 6388. As in several other clusters we have studied, the BSS distribution is found to be bimodal: highly peaked in the cluster center, rapidly…
XMM-Newton observations of the Lockman Hole: X-ray source catalogue and number counts
Cappelluti, N.; Barcons, X.; Fabian, A. C. +4 more
Context: The Lockman Hole field represents the sky area of lowest Galactic line-of-sight column density N_H=5.7 × 1019 cm-2. It was observed by the XMM-Newton X-ray observatory in 18 pointings for a total of 1.16 Ms (raw EPIC pn observing time) constituting the deepest XMM-Newton exposure so far. After the removal of time int…
Unveiling the nature of six HMXBs through IR spectroscopy
Mennickent, R. E.; Fabregat, J.; Nespoli, E.
Context: The International Gamma-Ray Astrophyiscs Laboratory (INTEGRAL) is discovering a large number of new hard X-ray sources, many of them being HMXBs. The identification and spectral characterization of their optical/infrared counterparts is a necessary step to undertake detailed study of these systems. In particular, the determination of the …
Exploring a SNR/molecular cloud association within HESS J1745-303
Santangelo, A.; Ripken, J.; Carrigan, S. +139 more
Aims: HESS J1745-303 is an extended, unidentified VHE (very high energy) gamma-ray source discovered using HESS in the Galactic Plane Survey. Since no obvious counterpart has previously been found in longer-wavelength data, the processes that power the VHE emission are not well understood.
Methods: Combining the latest VHE data with recent XMM…
Electron flat-top distributions around the magnetic reconnection region
RèMe, H.; Fazakerley, A. N.; Owen, C. J. +9 more
Cluster multisatellite observations provide snapshots of electron distributions around the magnetic neutral line. An isotropic flat-top-type electron distribution in phase space is frequently observed around the X line, together with large ion velocities and a Hall quadrupole-like magnetic field inside the hot and tenuous plasma sheet in the magne…