Search Publications
High frame rate imaging based photometry. Photometric reduction of data from electron-multiplying charge coupled devices (EMCCDs)
Grundahl, F.; Jørgensen, U. G.; Harpsøe, K. B. W. +1 more
Context. The EMCCD is a type of CCD that delivers fast readout times and negligible readout noise, making it an ideal detector for high frame rate applications which improve resolution, like lucky imaging or shift-and-add. This improvement in resolution can potentially improve the photometry of faint stars in extremely crowded fields significantly…
Strong interactions between g- and p-modes in the hybrid γ Doradus-δ Scuti CoRoT star ID 105733033
Mathias, P.; Debosscher, J.; Chapellier, E. +2 more
Context. The presence of stellar p- and g-modes allows us to test stellar structure models in great detail from the core to the envelope. As the driving mechanisms are not yet fully understood, the first important step is to provide clear evidence of these pulsation modes.
Aims: Recent space missions have confirmed that the γ Doradus and the …
The infrared dust bubble N22: an expanding H ii region and the star formation around it
Esimbek, J.; Wu, G.; Ji, W. -G. +3 more
Aims: To increase the observational samples of star formation around expanding H ii regions, we analyzed the interstellar medium and star formation around N22.
Methods: We used data extracted from the seven large-scale surveys from infrared to radio wavelengths. In addition we used the JCMT observations of the J = 3-2 line of 12
Modeling the evolution of infrared galaxies: clustering of galaxies in the cosmic infrared background
Doré, O.; Lagache, G.; Béthermin, M. +1 more
Context. Star-forming galaxies are highly biased tracers of the underlying dark matter density field. Their clustering can be studied through the cosmic infrared background (CIB) anisotropies. These anisotropies have been measured from 100 µm to 2 mm in the past few years.
Aims: In this paper, we present a fully parametric model allowin…
CXOM31 J004253.1+411422: the first ultraluminous X-ray transient in M 31
Pietsch, W.; Haberl, F.; Greiner, J. +6 more
Context. We seek clarification of the nature of X-ray sources detected in M 31. Here we focus on CXOM31 J004253.1+411422, the brightness of which suggests that it belongs to the class of ultraluminous X-ray sources.
Aims: We determine the X-ray properties of sources detected in the XMM-Newton/Chandra monitoring program. We investigate spectra…
9 Sagittarii: uncovering an O-type spectroscopic binary with an 8.6 year period
Gosset, E.; Rauw, G.; De Becker, M. +4 more
Context. The O-type object 9 Sgr is a well-known synchrotron radio emitter. This feature is usually attributed to colliding-wind binary systems, but 9 Sgr was long considered a single star.
Aims: We have conducted a long-term spectroscopic monitoring of this star to investigate its multiplicity and search for evidence for wind-wind interactio…
The dark matter distribution in z ~ 0.5 clusters of galaxies. I. Determining scaling relations with weak lensing masses
Arnaud, M.; Pointecouteau, E.; Pratt, G. W. +3 more
The total mass of clusters of galaxies is a key parameter for studing massive halos. It relates to numerous gravitational and baryonic processes at play in the framework of large-scale structure formation, thus rendering its determination both important and challenging. From a sample of the 11 X-ray bright clusters selected from the EXCPRES sample…
Herschel/HIFI observations of molecular emission in protoplanetary nebulae and young planetary nebulae
Waters, L. B. F. M.; Menten, K. M.; Olofsson, H. +16 more
Aims: We aim to study the physical conditions, particularly the excitation state, of the intermediate-temperature gas in protoplanetary nebulae and young planetary nebulae (PPNe, PNe). The information that the observations of the different components deliver is of particular importance for understanding the evolution of these objects.
Me…
Kinematics and helicity evolution of a loop-like eruptive prominence
Vial, J. -C.; Madjarska, M. S.; Schrijver, C. J. +4 more
Aims: We aim at investigating the morphology as well as kinematic and helicity evolution of a loop-like prominence during its eruption.
Methods: We used multi-instrument observations from AIA/SDO, EUVI/STEREO and LASCO/SoHO. The kinematic, morphological, geometrical, and helicity evolution of a loop-like eruptive prominence were studied …
Spectroscopic observations of propagating disturbances in a polar coronal hole: evidence of slow magneto-acoustic waves
Solanki, S. K.; Marsch, E.; Teriaca, L. +2 more
Aims: We focus on detecting and studying quasi-periodic propagating features that have been interpreted in terms of both slow magneto-acoustic waves and of high-speed upflows.
Methods: We analyzed long-duration spectroscopic observations of the on-disk part of the south polar coronal hole taken on 1997 February 25 by the SUMER spectromet…