Discovery of an X-Ray Photoionized Optical Nebula and a Radio Nebula Associated with the ULX NGC 4861 X-1

Bibcode
2023ApJ...958...24G
DOI
10.3847/1538-4357/acf8c3
Gong, Hang; Urquhart, Ryan; Vinokurov, Alexandr; Bai, Yu; Cabrera-Lavers, Antonio; Fabrika, Sergei; Wang, Liang; Liu, Jifeng
Bibliographical reference

The Astrophysical Journal

Advertised on:
11
2023
Journal
The Astrophysical Journal
Number of authors
8
IAC number of authors
1
Citations
0
Refereed citations
0
Description
We have conducted long-slit spectroscopic observations and analyzed archival radio data for the ultraluminous X-ray source (ULX) NGC 4861 X-1. Our spectral line analysis unveils NGC 4861 X-1 as the fourth ULX situated within an X-ray photoionized nebula, following three previous findings made approximately two decades ago. Remarkably, we discover NGC 4861 X-1 also possesses a radio nebula emitting optically thin synchrotron radiation, which contradicts its X-ray photoionization and raises doubts about the four ULXs being a mere coincidence. Instead of gradually accumulating from different bands bit by bit, our multiband discovery is made all at once. Moreover, we tentatively perceive a faint continuum spectrum of the optical nebula. Further observations are needed to ascertain its radio structures and verify the optical continuum.
Related projects
NGC 2808 Globular Cluster
Milky Way and Nearby Galaxies

The general aim of the project is to research the structure, evolutionary history and formation of galaxies through the study of their resolved stellar populations, both from photometry and spectroscopy. The group research concentrates in the most nearby objects, namely the Local Group galaxies including the Milky Way and M33 under the hypothesis

Martín
López Corredoira
Closed
Type
Refereed
Radio jets
Emission nebulae
X-ray binary stars
The Milky Way and the Local Group (MWLG)

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