Search Publications
Dust emission in star-forming dwarf galaxies: General properties and the nature of the submm excess
Izotov, Y. I.; Henkel, C.; Guseva, N. G. +2 more
We studied the global characteristics of dust emission in a large sample of emission-line star-forming galaxies. The sample consists of two subsamples. One subsample (SDSS sample) includes ~4000 compact star-forming galaxies from the Sloan Digital Sky Survey (SDSS), which were also detected in all four bands at 3.4 µm, 4.6 µm, 12 &micr…
Herschel-ATLAS and ALMA. HATLAS J142935.3-002836, a lensed major merger at redshift 1.027
Ivison, R. J.; Fu, Hai; Dunne, Loretta +36 more
Context. The submillimetre-bright galaxy population is believed to comprise, aside from local galaxies and radio-loud sources, intrinsically active star-forming galaxies, the brightest of which are lensed gravitationally. The latter enable studies at a level of detail beyond what is usually possible by the observation facility.
Aims: This wor…
Physical conditions of molecular gas in the Circinus galaxy Multi-J CO and Ci 3PP0 observations
Menten, Karl M.; Gao, Yu; Zhang, Zhi-Yu +6 more
We report mapping observations of the 12CO J = 3 → 2, 4 → 3, 6 → 5, and 7 → 6 transitions and the Ci 3PP0 (Ci) 492GHz transition toward the central 40'' × 40'' region of the Circinus galaxy, using the Atacama Pathfinder EXperiment (APEX) telescope. We also detected 13COJ = 3 → 2 at the central position o…
Carbon in different phases ([CII], [CI], and CO) in infrared dark clouds: Cloud formation signatures and carbon gas fractions
Henning, Th.; Krause, O.; Ossenkopf, V. +8 more
Context. How molecular clouds form out of the atomic phase and what the relative fractions of carbon are in the ionized, atomic, and molecular phase are questions at the heart of cloud and star formation.
Aims: We want to understand the kinematic processes of gas flows during the formation of molecular clouds. In addition to that, we aim at d…
Physical properties of the jet from DG Tauri on sub-arcsecond scales with HST/STIS
Ray, T. P.; Eislöffel, J.; Podio, L. +5 more
Context. Stellar jets are believed to play a key role in star formation, but the question of how they originate is still being debated.
Aims: We derive the physical properties at the base of the jet from DG Tau both along and across the flow and as a function of velocity.
Methods: We analysed seven optical spectra of the DG Tau jet, take…
Cross-calibration of the XMM-Newton EPIC pn and MOS on-axis effective areas using 2XMM sources
Read, A. M.; Guainazzi, M.; Sembay, S.
Aims: We aim to examine the relative cross-calibration accuracy of the on-axis effective areas of the XMM-Newton EPIC pn and MOS instruments.
Methods: Spectra from a sample of 46 bright, high-count, non-piled-up, isolated on-axis point sources are stacked together, and model residuals are examined to characterize the EPIC MOS-to-pn inter…
Spectral and temporal properties of RX J0520.5-6932 (LXP 8.04) during a type-I outburst
Haberl, F.; Udalski, A.; Sturm, R. +2 more
Aims: We observed RX J0520.5-6932 in the X-rays and studied the optical light curve of its counterpart to verify it as a Be/X-ray binary.
Methods: We performed an XMM-Newton anticipated target-of-opportunity observation in January 2013 during an X-ray outburst of the source in order to search for pulsations and derive its spectral proper…
Rigorous treatment of barycentric stellar motion. Perspective and light-time effects in astrometric and radial velocity data
Lindegren, L.; Butkevich, A. G.
Context. High-precision astrometric and radial-velocity observations require accurate modelling of stellar motions in order to extrapolate measurements over long time intervals, and to detect deviations from uniform motion caused, for example, by unseen companions.
Aims: We aim to explore the simplest possible kinematic model of stellar motio…
The accretion environment in Vela X-1 during a flaring period using XMM-Newton
Wilms, J.; Torrejón, J. M.; Kretschmar, P. +8 more
We present analysis of 100 ks contiguous XMM-Newton data of the prototypical wind accretor Vela X-1. The observation covered eclipse egress between orbital phases 0.134 and 0.265, during which a giant flare took place, enabling us to study the spectral properties both outside and during the flare. This giant flare with a peak luminosity of 3.92
The extended structure of the dwarf irregular galaxies Sextans A and Sextans B. Signatures of tidal distortion in the outskirts of the Local Group
Bellazzini, M.; Galleti, S.; Testa, V. +7 more
We present a detailed study of the stellar and H i structure of the dwarf irregular galaxies Sextans A and Sextans B, members of the NGC 3109 association. We use newly obtained deep (r ≃ 26.5) and wide-field g and r photometry to extend the surface brightness (SB) profiles of the two galaxies down to µV ≃ 31.0 mag/arcsec2