Search Publications
XMM-Newton and INTEGRAL analysis of the Ophiuchus cluster of galaxies
Eckert, D.; Kaastra, J.; Bonamente, M. +2 more
Aims. We investigated the non-thermal hard X-ray emission in the Ophiuchus cluster of galaxies. Our aim is to characterise the physical properties of the non-thermal component and its interaction with the cosmic microwave background.
Methods: We performed spatially resolved spectroscopy and imaging using XMM-Newton data to model the thermal em…
Uncovering strong MgII absorbing galaxies. Imaging below the Lyman limit
Fynbo, J. P. U.; Christensen, L.; Petitjean, P. +2 more
Context: The nature of the galaxies that give rise to absorption lines, such as damped Lyman-α systems (DLAs) or strong Mg ii lines, in quasar spectra is difficult to investigate in emission. These galaxies can be very faint and located close to the lines of sight of the much brighter background quasars.
Aims: Taking advantage of the total abs…
Abundances in the planetary nebula NGC 6210
Pottasch, S. R.; Bernard-Salas, J.; Roellig, T. L.
The spectra of the planetary nebula
Multi-wavelength fine structure and mass flows in solar microflares
Veronig, A. M.; Sütterlin, P.; Rybák, J. +2 more
Aims: We study the multi-wavelength characteristics at high spatial resolution, as well as chromospheric evaporation signatures of solar microflares. To this end, we analyze the fine structure and mass flow dynamics in the chromosphere, transition region and corona of three homologous microflares (GOES class <A9/0.7 with/without background), wh…
Evolution of the optical Tully-Fisher relation up to z = 1.3
Castañeda, H.; Cepa, J.; Bongiovanni, A. +5 more
Context: The study of the evolution of the Tully-Fisher relation has been controversial in the past years. The main difficulty is in determining the required parameters for intermediate and high redshift galaxies, given the cosmological corrections and biases involved.
Aims: This work aims to identify the main problems of the study of the Tull…
Star formation history of Canis Major R1. I. Wide-Field X-ray study of the young stellar population
Preibisch, T.; Zinnecker, H.; Rodrigues, C. V. +3 more
Aims: The CMa R1 star-forming region contains several compact clusters as well as many young early-B stars. It is associated with a well-known bright rimmed nebula, the nature of which is unclear (fossil HII region or supernova remnant). To help elucidate the nature of the nebula, our goal was to reconstruct the star-formation history of the CMa R…
The star cluster population of the spiral galaxy NGC 3370
Blakeslee, J. P.; Cantiello, M.; Brocato, E.
Aims: We study the photometric and structural properties of the star cluster system in the late type Sc spiral
Methods: BVI observations from the Advanced Camera for Surveys on board of HST are used to analyse in detail the colours, magnitudes and spatial properties of cluster candidates. The final catalogue of sou…
R-matrix electron-impact excitation data for B-like Si and its application in cool stars
Badnell, N. R.; Liang, G. Y.; Whiteford, A. D.
We present the results of an intermediate coupling frame-transformation R-matrix calculation for the electron-impact excitation of Si9+. The target and close-coupling expansions are both taken to be the 125 fine-structure levels (58 LS terms) belonging to the configurations 2sx2py (x+y = 3) and 2sα2p
On the nature of the extragalactic number counts in the K-band
Pelló, R.; Pérez-González, P. G.; Guzmán, R. +10 more
Context: The galaxy number counts has been traditionally used to test models of galaxy evolution. However, the origin of significant differences in the shape of number counts at different wavelengths is still unclear. By relating the most remarkable features in the number counts with the underlying galaxy population it is possible to introduce fur…
Near-IR search for lensed supernovae behind galaxy clusters. I. Observations and transient detection efficiency
Lidman, C.; Amanullah, R.; Goobar, A. +11 more
Context: Massive galaxy clusters at intermediate redshift can magnify the flux of distant background sources by several magnitudes.
Aims: We exploit this effect to search for lensed distant supernovae that may otherwise be too faint to be detected.
Methods: A supernova search was conducted at near infrared wavelengths using the ISAAC instr…