Search Publications
Isolated starless cores in infrared dark clouds in the Hi-GAL survey
Peretto, N.; Elia, D.; Griffin, M. J. +15 more
In a previous paper, we identified cores within infrared dark clouds. We regarded those without embedded sources as the least evolved and labelled them starless. Here we identify the most isolated starless cores and model them using a three-dimensional multiwavelength Monte Carlo radiative transfer code. We derive the cores' physical parameters an…
Axial symmetry breaking of Saturn's thermosphere
Achilleos, N.; Smith, C. G. A.
The source of the various planetary-period signals in Saturn's magnetosphere is at present unknown. We investigate the possibility that the source of these signals is an axially asymmetric wind system in the thermosphere. We describe a feedback mechanism that has the potential to drive such axially asymmetric wind systems. The proposed mechanism r…
Measuring the black hole masses in accreting X-ray binaries by detecting the Doppler orbital motion of their accretion disc wind absorption lines
Yao, Yangsen; Zhang, Shuang-Nan; Liao, Jinyuan
So far essentially all black hole masses in X-ray binaries have been obtained by observing the companion star's velocity and light curves as functions of the orbital phase. However, a major uncertainty is the estimate of the orbital inclination angle of an X-ray binary. Here we suggest to measure the black hole mass in an X-ray binary by measuring…
XMM-Newton and Swift observations of the Type IIb supernova 2011dh in Messier 51
Campana, Sergio; Immler, Stefan
The Type IIb supernova (SN) 2011dh exploded in the nearby galaxy M51 (the Whirlpool galaxy) and provides us with one of the best laboratories to study early high-energy emission from SNe. We give here a comprehensive view of the X-ray properties of SN 2011dh from the analyses of two pointed XMM-Newton early observations as well as the full Swift X…
Newly identified star clusters in M33 - III. Structural parameters
Holtzman, J. A.; Sarajedini, A.; Garnett, D. R. +1 more
We present the morphological properties of 161 star clusters in M33 using the Advanced Camera for Surveys Wide Field Channel on-board the Hubble Space Telescope using observations with the F606W and F814W filters. We obtain, for the first time, ellipticities, position angles and surface brightness profiles for a significant number of clusters. On …
Cluster-cluster lensing and the case of Abell 383
Zitrin, Adi; Umetsu, Keiichi; Medezinski, Elinor +8 more
Extensive surveys of galaxy clusters motivate us to assess the likelihood of cluster-cluster lensing (CCL), namely, gravitational lensing of a background cluster by a foreground cluster. We briefly describe the characteristics of CCLs in optical, X-ray and Sunyaev-Zel'dovich effect measurements, and calculate their predicted numbers for Λ cold dar…
Charging of ice grains in Saturn's E ring: theory and observations
Misra, Shikha; Mishra, S. K.; Sodha, M. S.
We have developed a theoretical model for a physical understanding of the charging of ice grains in the plasma of Saturn's E ring. The evaluated results are compared with the available observations and measurements from the Cassini, Hubble Space Telescope, Voyager and Pioneer campaigns. In this formulation, we implement the uniform potential theor…
Constraining stellar assembly and active galactic nucleus feedback at the peak epoch of star formation
Ryan, R. E.; O'Connell, R. W.; Hathi, N. P. +9 more
We study stellar assembly and feedback from active galactic nuclei (AGN) around the epoch of peak star formation (1 ≲z≲ 2), by comparing hydrodynamic simulations to rest-frame UV-optical galaxy colours from the Wide Field Camera 3 (WFC3) Early Release Science (ERS) programme. Our adaptive mesh refinement simulations include metal-dependent radiati…
Golden gravitational lensing systems from the Sloan Lens ACS Survey - II. SDSS J1430+4105: a precise inner total mass profile from lensing alone
Seitz, Stella; Eichner, Thomas; Bauer, Anne
We study the Sloan Lens ACS (SLACS) survey strong-lensing system SDSS J1430+4105 at zl = 0.285. The lensed source (zs = 0.575) of this system has a complex morphology with several subcomponents. Its subcomponents span a radial range from 4 to 10 kpc in the plane of the lens. Therefore, we can constrain the slope of the total …
The enigmatic black hole candidate and X-ray transient IGR J17091-3624 in its quiescent state as seen with XMM-Newton
Altamirano, D.; Wijnands, R.; Yang, Y. J.
We report on two short XMM-Newton observations performed in 2006 August and 2007 February during the quiescence state of the enigmatic black hole candidate system IGR J17091-3624. During both observations the source was clearly detected. Although the errors on the estimated fluxes are large, the source appears to be brighter by several tens of per…