REVIEW 7 cited by
Optical Counterparts of Ultraluminous X-Ray Sources
Not yet reviewed by Pith; the record is open.
This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.
SPECIMEN: schema-true, not a live event
T0 review · schema-true
One-sentence machine reading of the paper's core claim.
pith:XXXXXXXX · record.json · timestamp
Signed reviews
read the original abstract
Despite much observational and theoretical effort little is presently known about the nature of the luminous non-nuclear X-ray sources which appear to largely surpass the Eddington limit of a few solar masses. Here we present first results of our OHP/ESO/CFHT optical survey of the environments of variable ultraluminous X-ray sources (ULX) in nearby galaxies. At the position of several ULX we find emission nebulae of a few hundred parsecs diameter, and which often show both low and high ionisation emission lines. The gas must therefore be either photoionized by hard XUV continua, or be shock-ionized in the expanding bubbles. The nebulae have kinematic ages of some million years and appear to be directly linked to the highly energetic formation process of the compact ULX or being inflated by ongoing stellar wind/jet activity. The discovery of intense HeII lambda4686 nebular recombination radiation together with comparatively strong [OI] lambda6300 emission around the variable ULX in dwarf galaxy Holmberg II has allowed us to show that the interstellar medium acually 'sees' and reprocesses part of the 10^40 erg/s measured at X-ray wavelengths, if we assume isotropic emission. Strong beaming into our line of sight which has been advocated to avoid such high luminosities can thus be excluded, at least for this source.
Forward citations
Cited by 7 Pith papers
-
Strongly Magnetized Super-Eddington Accretion: How Spin and Accretion Rate Regulate Energy Output and Mass Loss
GRRMHD simulations of 32 super-Eddington magnetically arrested disks show black hole spin boosts energy output super-linearly while mass has no effect over 5–30 solar masses.
-
Significant or Not? The Impact of Randomisation During Data Reduction on Confirming a New Pulsating Ultraluminous X-ray Source Candidate in Centaurus A
A soft-spectrum PULX candidate is reported in Cen A but XMM-SAS randomisation during data reduction renders the marginal 1.27 Hz pulsation detection unreliable across repeated reductions.
-
Optically Thick Outflow Driven by Supercritical Accretion May Explain Little Red Dots
Super-Eddington outflows from 10^5–10^7 M_sun black holes, with 3000–6000 K photospheres, can account for Little Red Dots' red continua, broad-line widths, and Balmer breaks.
-
Reprocessing of X-rays emission in Ultra-Luminous X-ray sources
ULXs show suppressed reprocessed X-ray emission: iron line equivalent widths are below 11 to 20 eV, no eclipse hardness ratio change is seen, and the pattern points to metal-poor or highly ionized environments.
-
Spectral Insights and Evolutionary Pathways of Globular Cluster ULX in NGC 1399: A Two-Decade X-ray and Optical Study
GCU7, a bright X-ray and optical source in a globular cluster in NGC 1399, is best explained as a young neutron star accreting from a helium white dwarf, not an intermediate-mass black hole tidally disrupting a star.
-
Photoionization of the Composite Nebula Surrounding NGC 5408 X-1: Implications for Beamed Emission
Photoionization modeling indicates NGC 5408 X-1's EUV and X-ray emission is mildly beamed, consistent with supercritical accretion.
-
Deep optical spectroscopic monitoring of the pulsating ULX NGC 1313 X-2 with longslit Gemini observations
Gemini spectroscopy suggests an A-type supergiant donor in NGC 1313 X-2 and provides updated constraints on orbital parameters, disk size, and gas bubble expansion.
Discussion (0). Continue with ORCID to comment.