164 citations · 1.4k across the 37 of their papers we have counts for
6 papers · 1 filter
(No) dynamical constraints on the mass of the black hole in two ULXs
T. P. Roberts, J. C. Gladstone, A. D. Goulding +4
We present the preliminary results of two Gemini campaigns to constrain the mass of the black hole in an ultraluminous X-ray source (ULX) via optical spectroscopy. Pilot studies of…
New observations of ULX supershells, and their implications
David M. Russell, Yi-Jung Yang, Jeanette C. Gladstone +2
New optical narrowband imaging observations of the fields of several ULXs are presented. Known supershell nebulae are associated with a number of these ULXs, which we detect in emi…
A Large Catalogue of Ultraluminous X-ray Source Candidates in Nearby Galaxies
D. J. Walton, J. C. Gladstone, T. P. Roberts +1
Since their discovery, Ultraluminous X-ray sources (ULXs) have attracted attention due to their combination of extreme luminosities and extra-nuclear locations. However, they are a…
The Hot Interstellar Medium of the Interacting Galaxy NGC 4490
A. J. Richings, G. Fabbiano, Junfeng Wang +1
We present an analysis of the hot interstellar medium (ISM) in the spiral galaxy NGC 4490, which is interacting with the irregular galaxy NGC 4485, using ~100ks of Chandra ACIS-S o…
Challenging times: a re-analysis of NGC 5408 X-1
M. J. Middleton, T. P. Roberts, C. Done +1
The ultraluminous X-ray source (ULX), NGC 5408 X-1, is one of only 3 such objects to show a quasi-periodic oscillation (QPO) in its power spectrum. Previous analysis of this signal…
Ultraluminous X-ray Sources forming in low metallicity natal environments
L. Zampieri, M. Colpi, M. Mapelli +2
In the last few years multiwavelength observations have boosted our understanding of Ultraluminous X-ray Sources (ULXs). Yet, the most fundamental questions on ULXs still remain to…