English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present optically thin solutions for magnetized, advective disc-outflowsymbiosis around black holes (BHs). The main objective is to explain thebright, hard state observations of accreting systems with stellar-mass tosupermassive BHs. We include the effects of magnetic fields and radiationcounterpart in entropy gradient based on the first law of thermodynamics torepresent energy advection. The cooling process includes bremsstrahlung,synchrotron radiation, and inverse Comptonization process. One of our mainventures is to explain some long-standing issues of ultra-luminous X-raysources (ULXs). The existing physical scenarios to explain their unusual highluminosity are either the existence of the missing class of intermediate-massBH (IMBH), or super-Eddington accretion around a stellar-mass BH. However, mostULXs with steep power-law spectrum can be well explained throughsuper-Eddington accretion, while the existence of IMBH is indeed disputedextensively. Nevertheless, the interpretation of ULXs with a hard power-lawdominated state remains mysterious. Here we show that our magneticallydominated disc-outflow symbiosis around rapidly spinning stellar-mass BHs canachieve such large luminosity even for sub-Eddington accretion rate. Themagnetic field at the outer zone of the advective flow is more than thecorresponding Eddington limit. Such field becomes dynamically dominant near theBH through continuous accretion process due to flux freezing, but maintainingits Eddington limit. This unique field configurations enhance the synchrotron,and synchrotron self-Comptonization process to achieve very large luminosity.Through the same mechanism, our solutions for supermassive BHs can explain theunusual large luminosity of ultra-luminous quasars.

Role of magnetically dominated disc-outflow symbiosis on bright hard-state black hole sources: ultra-luminous X-ray sources to quasars