28 citations · 141 across the 10 of their papers we have counts for
8 papers · 1 filter
Attenuation of super-soft X-ray sources by circumstellar material
Mikkel Nielsen, Marat Gilfanov
Recent studies have suggested the possibility of significantly obscuring super-soft X-ray sources in relatively modest amounts of local matter lost from the binaries themselves. If…
Upper limits on the luminosity of the progenitor of type Ia supernova SN2014J
M. T. B. Nielsen, M. Gilfanov, A. Bogdan +2
We analysed archival data of Chandra pre-explosion observations of the position of SN2014J in M82. No X-ray source at this position was detected in the data, and we calculated uppe…
On double-degenerate type Ia supernova progenitors as supersoft X-ray sources - A population synthesis analysis using SeBa
Mikkel T. B. Nielsen, Gijs Nelemans, Rasmus Voss +1
Context: The nature of the progenitors of type Ia supernova (SN) progenitors remains unclear. While it is usually agreed that single-degenerate progenitor systems would be luminous…
Upper limits on bolometric luminosities of three type Ia supernova progenitors - New results in the ongoing Chandra archival search for type Ia supernova progenitors
M. T. B. Nielsen, R. Voss, G. Nelemans
We present analysis of Chandra archival, pre-explosion data of the positions of three nearby (< 25 Mpc) type Ia supernovae, SN2011iv, SN2012cu & SN2012fr. No sources corresponding…
On the association of ULXs with young superclusters: M82 X-1 and a new candidate in NGC 7479
R. Voss, M. T. B. Nielsen, G. Nelemans +2
We investigate the spatial coincidence of ultra-luminous X-ray sources (ULXs) with young massive stellar clusters. In particular we perform astrometry on Chandra and HST data of tw…
Obscuring Supersoft X-ray Sources in Stellar Winds
Mikkel Thomas Bøje Nielsen, Carsten Dominik, Gijs Nelemans
We investigate the possibility of obscuring supersoft X-ray sources in the winds of companion stars. We derive limits on the amount of circumstellar material needed to fully obscur…