10 papers · 1 filter
How rapidly do neutron stars spin at birth?
Roberto Soria, Rosalba Perna, David Pooley +1
We have studied the X-ray properties of ageing historical core-collapse supernovae in nearby galaxies, using archival data from Chandra, XMM-Newton and Swift. We found possible evi…
Characteristic temperatures and spectral appearance of ULX disks
Roberto Soria, Kinwah Wu, Zdenka Kuncic
A standard disk around an accreting black hole may become effectively optically-thin and scattering dominated in the inner region, for high accretion rates (as already predicted by…
Runaway core collapse and cluster survival: where are the parent clusters of ULXs?
Roberto Soria
Accreting intermediate-mass black holes (IMBHs) have been proposed as an explanation for ultraluminous X-ray sources (ULXs). Runaway core collapse inside a massive cluster is a pos…
A ULX in NGC 4559: a "mini-cartwheel" scenario?
Roberto Soria, Mark Cropper, Manfred Pakull
We have studied an ultraluminous X-ray source (ULX) in NGC 4559 with XMM-Newton, and its peculiar star-forming environment with HST/WFPC2. The X-ray source is one of the brightest…
X-ray properties of spiral galaxies
Roberto Soria
X-ray studies of nearby spiral galaxies with star formation allow us to investigate temperature and spatial distribution of the hot diffuse plasma, and to carry out individual and…
A High Resolution X-ray spectrum of the LINER Galaxy M81
M. J. Page, A. A. Breeveld, R. Soria +1
We present the soft X-ray spectrum of the LINER galaxy M81 from a long observation with the XMM-Newton RGS. As well as continuum emission from the active nucleus, the spectrum show…