Unveiling recurrent jets of the ULX Holmberg II X-1: evidence for a massive stellar-mass black hole?

Bibcode
2014MNRAS.439L...1C
DOI
10.1093/mnrasl/slt166
Cseh, D.; Kaaret, P.; Corbel, S.; Grisé, F.; Lang, C.; Körding, E.; Falcke, H.; Jonker, P. G.; Miller-Jones, J. C. A.; Farrell, S.; Yang, Y. J.; Paragi, Z.; Frey, S.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society: Letters, Volume 439, Issue 1, p.L1-L5

Advertised on:
3
2014
Number of authors
13
IAC number of authors
1
Citations
55
Refereed citations
51
Description
We report on the discovery of an apparent triple radio structure hidden inside the radio bubble of the ultraluminous X-ray source Holmberg II X-1. The morphology is consistent with a collimated jet structure, which is observed to emit optically thin synchrotron radiation. The central component has a steep radio spectrum and is brighter than the outer components indicating a renewed radio activity. We estimate a minimum time-averaged jet power of ˜2 × 1039 erg s-1 that is associated with a time-averaged isotropic X-ray luminosity of at least 4 × 1039 erg s-1. Our results suggest that Holmberg II X-1 is powered by a black hole of MBH ≥ 25 M⊙, that is inferred to be accreting at a high Eddington rate with intermittent radio activity.
Related projects
Black hole in outburst
Black holes, neutron stars, white dwarfs and their local environment
Accreting black-holes and neutron stars in X-ray binaries provide an ideal laboratory for exploring the physics of compact objects, yielding not only confirmation of the existence of stellar mass black holes via dynamical mass measurements, but also the best opportunity for probing high-gravity environments and the physics of accretion; the most
Montserrat
Armas Padilla
In progress
Type
Refereed
Stellar & Interstellar Physics (FEEI)
Accretion
Black hole physics

It may interest you

  • Refereed
    Planetary nebula evolution for single stellar models. The formation of neutral spikes
    Two-dimensional hydrodynamical simulations are presented from the formation up to the late evolution of planetary nebula, for six different stellar models from 1 to 5 M $_{\odot }$. The hydrodynamical models use stellar evolution calculations as inner boundary conditions and updated values for the number of ionizing photons. Special emphasis is
    García-Segura, Guillermo et al.

    Advertised on:

    11
    2025
    Bibcode
    2025MNRAS.543.3867G
    Citations
    0
  • Refereed
    SN 2024bfu, SN 2025qe, and the early light curves of type Iax supernovae
    Type Iax supernovae (SNe Iax) are one of the most common subclasses of thermonuclear supernova and yet their sample size, particularly those observed shortly after explosion, remains relatively small. In this paper, we present photometric and spectroscopic observations of two SNe Iax discovered shortly after explosion, SN 2024bfu and SN 2025qe
    Magee, M. R. et al.

    Advertised on:

    11
    2025
    Bibcode
    2025MNRAS.543.3731M
    Citations
    0
  • Refereed
    Aligned, Multiple-transient Events in the First Palomar Sky Survey
    Old, digitized astronomical images taken before the human spacefaring age offer a rare glimpse of the sky before the era of artificial satellites. In this paper, we present the first optical searches for artificial objects with high specular reflections near the Earth. We follow the method proposed in Villarroel et al. and use a transient sample
    Villarroel, Beatriz et al.

    Advertised on:

    10
    2025
    Bibcode
    2025PASP..137j4504V
    Citations
    0