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The circumstellar disk of HH 30. Searching for signs of disk evolution with multi-wavelength modeling
Wolf, S.; Guilloteau, S.; Dutrey, A. +1 more
Context. Circumstellar disks are characteristic for star formation and vanish during the first few Myr of stellar evolution. During this time planets are believed to form in the dense midplane by growth, sedimentation and aggregation of dust. Indicators of disk evolution, such as holes and gaps, can be traced in the spectral energy distribution (S…
The first outburst of the black-hole candidate MAXI J1836-194 observed by INTEGRAL, Swift, and RXTE
Capitanio, F.; Ferrigno, C.; Bozzo, E. +1 more
MAXI J1836-194 is a transient black-hole candidate discovered in outburst on 30 August 2011. We report on the available INTEGRAL, Swift, and RXTE observations performed in the direction of the source during this event before 55 864 MJD. Combining the broad band (0.6-200 keV) spectral and timing information obtained from these data with the results…
Gasa impact crater, Mars: Very young gullies formed from impact into latitude-dependent mantle and debris-covered glacier deposits?
Head, James W.; Schon, Samuel C.
The mode of formation of gullies on Mars, very young erosional-depositional landforms consisting of an alcove, channel, and fan, is one of the most enigmatic problems in martian geomorphology. Major questions center on their ages, geographic and stratigraphic associations, relation to recent ice ages, and, if formed by flowing water, the sources o…
The ROSAT-ESO flux limited X-ray galaxy cluster survey (REFLEX II). I. Newly identified X-ray luminous clusters at z ≥ 0.2
Böhringer, H.; Chon, G.
We report 19 intermediate redshift clusters newly detected in the ROSAT All-Sky survey that are spectroscopically confirmed. They form a part of 911 objects in the REFLEX II cluster catalogue with a limiting flux of 1.8 × 10-12 erg/s/cm2 in the 0.1-2.4 keV ROSAT band at redshift z ≥ 0.2. In addition we report three clusters f…
The Close T Tauri Binary System V4046 Sgr: Rotationally Modulated X-Ray Emission from Accretion Shocks
Donati, J. -F.; Audard, M.; Güdel, M. +11 more
We report initial results from a quasi-simultaneous X-ray/optical observing campaign targeting V4046 Sgr, a close, synchronous-rotating classical T Tauri star (CTTS) binary in which both components are actively accreting. V4046 Sgr is a strong X-ray source, with the X-rays mainly arising from high-density (n e~ 1011-1012…
Angular correlation functions of X-ray point-like sources in the full exposure XMM-LSS field
Chiappetti, L.; Pierre, M.; Gosset, E. +8 more
Aims: Our aim is to study the large-scale structure of different types of AGN using the medium-deep XMM-LSS survey.
Methods: We measure the two-point angular correlation function of 5700 and 2500 X-ray point-like sources over the 11 sq. deg. XMM-LSS field in the soft (0.5-2 keV) and hard (2-10 keV) bands. For the conversion from the angu…
Newly Discovered Global Temperature Structures in the Quiet Sun at Solar Minimum
Landi, Enrico; Gombosi, Tamas I.; Frazin, Richard A. +3 more
Magnetic loops are building blocks of the closed-field corona. While active region loops are readily seen in images taken at EUV and X-ray wavelengths, quiet-Sun (QS) loops are seldom identifiable and are therefore difficult to study on an individual basis. The first analysis of solar minimum (Carrington Rotation 2077) QS coronal loops utilizing a…
Dependence of solar proton events on their associated activities: Coronal mass ejection parameters
Moon, Y. -J.; Gopalswamy, N.; Park, J.
In this study we have examined the occurrence probability of solar proton events (SPEs) and their peak fluxes depending on coronal mass ejection (CME) parameters, linear speed (V), angular width (AW), and location (L). For this we used the NOAA SPE list and their associated CME data from 1997 to 2006. We found that the probability strongly depends…
The Distance to M101 Hosting Type Ia Supernova 2011fe Based on the Tip of the Red Giant Branch
Lee, Myung Gyoon; Jang, In Sung
We present a new determination of the distance to M101, host of the Type Ia supernova (SN Ia) 2011fe, based on the tip of the red giant branch (TRGB) method. Our determination is based on Hubble Space Telescope archival F555W and F814W images of nine fields within the galaxy. Color-magnitude diagrams of arm-free regions in all fields show a promin…
Atomic oxygen on the Venus nightside: Global distribution deduced from airglow mapping
Montmessin, F.; Bertaux, J. -L.; Drossart, P. +3 more
The Visible and Infra-Red Thermal Imaging Spectrometer (VIRTIS) instrument on board the Venus Express spacecraft has measured the O 2(a 1Δ) nightglow distribution at 1.27 µm in the Venus mesosphere for more than two years. Nadir observations have been used to create a statistical map of the emission on Venus nightside. …