Chandra observation of an ultraluminous X-ray source from the Galaxy NGC 12911

TL;DR

This paper analyzes an ultraluminous X-ray source in galaxy NGC 1291 using Chandra data, aiming to confirm assumptions about ULXs' nature and properties.

Contribution

It provides the first detailed analysis of ULX IXO6 in NGC 1291, confirming its classification and characteristics based on Chandra observations.

Findings

ULX IXO6 confirmed as an off-nuclear, high-luminosity X-ray source.

Supports the assumption that ULXs exceed Eddington luminosity for stellar-mass black holes.

No nearby X-ray sources detected around IXO6.

Abstract

I report the analysis of an ultraluminous X-ray source (ULX) located in the galaxy NGC 1291. This X-ray point source is denominated IXO6 in the Catalog of Candidate IXO (Colbert & Ptak). An Intermediate-luminosity X-ray Object (IXO) is defined as an off-nuclear, compact object with luminosity Lx [2-10keV] >= 1039 erg s-1. The cutoff Lx is defined as a value greater than the Eddington luminosity of a 1.4 Mo black hole (10 38.3 erg s-1). IXO is an early denomination of what is call now a ULX point source. The Catalog was derived from a ROSAT survey and represents 87 IXOS in 54 galaxies. IXO6 was selected because of being positioned in the outer disk of the galaxy, with no near X-ray source neighbors. The study of this ULX pretends to confirm certain assumptions related to this class of objects (Roberts et al.)