Search Publications
The origin of mid-infrared emission in massive young stellar objects: multi-baseline VLTI observations of W33A
Lumsden, S. L.; Hoare, M. G.; de Wit, W. J. +1 more
Aims: In this paper we aim to determine the structure on 100 AU scales of the massive young stellar object W33A, using interferometric observations in the mid-infrared. This emission could be caused by a variety of elements, for example, the inner protostellar envelope, outflow cavity walls, or a dusty or gaseous accretion disk.
Methods:…
Active region moss. Basic physical parameters and their temporal variation
Young, P. R.; Mason, H. E.; Del Zanna, G. +1 more
Context. Active region moss are transition region phenomena, first noted in the images recorded by the Transition Region and Coronal Explorer (TRACE) in λ171. Moss regions are thought to be the footpoints of hot loops (3-5 MK) seen in the core of active regions. These hot loops appear “fuzzy” (unresolved). Therefore, it is difficult to study the p…
From high-mass starless cores to high-mass protostellar objects
Henning, Th.; Krause, O.; Beuther, H. +3 more
Aims: Our aim is to understand the evolutionary sequence of high-mass star formation from the earliest evolutionary stage of high-mass starless cores, via high-mass cores with embedded low- to intermediate-mass objects, to finally high-mass protostellar objects.
Methods: Herschel far-infrared PACS and SPIRE observations are combined with…
PKS 2005-489 at VHE: four years of monitoring with HESS and simultaneous multi-wavelength observations
Klochkov, D.; Santangelo, A.; Quirrenbach, A. +170 more
Aims: Our aim is to study the very high energy (VHE; E>100 GeV) γ-ray emission from BL Lac objects and the evolution in time of their broad-band spectral energy distribution (SED).
Methods: VHE observations of the high-frequency peaked BL Lac object PKS 2005-489 were made with the High Energy Stereoscopic System (HESS) from 2004 throu…
Gravitational lensing in the supernova legacy survey (SNLS)
Sullivan, M.; Astier, P.; Conley, A. +18 more
Aims: The observed brightness of type Ia supernovae is affected by gravitational lensing caused by the mass distribution along the line of sight, which introduces an additional dispersion into the Hubble diagram. We look for evidence of lensing in the SuperNova Legacy Survey 3-year data set.
Methods: We investigate the correlation betwee…
Large-scale distributions of mid- and far-infrared emission from the center to the halo of M 82 revealed with AKARI
Ohyama, Y.; Wada, T.; Onaka, T. +6 more
Context. The edge-on starburst galaxy M 82 exhibits complicated distributions of gaseous materials in its halo, which include ionized superwinds driven by nuclear starbursts, neutral materials entrained by the superwinds, and large-scale neutral streamers probably caused by a past tidal interaction with M 81.
Aims: We investigate detailed dis…
Evolution of blue E/S0 galaxies from z ~ 1: merger remnants or disk-rebuilding galaxies?
Bolzonella, M.; Koekemoer, A. M.; Huertas-Company, M. +3 more
Context. Studying outliers from the bimodal distribution of galaxies in the color-mass space, such as morphological early-type galaxies residing in the blue cloud (blue E/S0s), can help for better understanding the physical mechanisms that lead galaxy migrations in this space.
Aims: In this paper we try to bring new clues to studying the evol…
Planetary nebulae abundances and stellar evolution II
Pottasch, S. R.; Bernard-Salas, J.
Context. In recent years mid- and far infrared spectra of planetary nebulae have been analysed and lead to more accurate abundances. It may be expected that these better abundances lead to a better understanding of the evolution of these objects.
Aims: The observed abundances in planetary nebulae are compared to those predicted by the models …
The nature of p-modes and granulation in HD 49933 observed by CoRoT
Fossati, L.; Kallinger, T.; Guenther, D. B. +2 more
Context. Recent observations of HD 49933 by the space-photometric mission CoRoT provide photometric evidence of solar type oscillations in a star other than our Sun. The first published reduction, analysis, and interpretation of the CoRoT data yielded a spectrum of p-modes with l = 0, 1, and 2.
Aims: We present our own analysis of the CoRoT d…
Non-parametric modeling of the intra-cluster gas using APEX-SZ bolometer imaging data
Zhang, Y. -Y.; Kneissl, R.; Menten, K. M. +23 more
Aims: We aim to demonstrate the usability of mm-wavelength imaging data obtained from the APEX-SZ bolometer array to derive the radial temperature profile of the hot intra-cluster gas out to radius r500 and beyond. The goal is to study the physical properties of the intra-cluster gas by using a non-parametric de-projection method t…