Abstract
The joint detection of gravitational waves and the gamma-ray counterpart of a binary neutron star merger event, GW170817, unambiguously validates the connection between short gamma-ray bursts and compact binary object (CBO) mergers. We focus on a special scenario where short gamma-ray bursts produced by CBO mergers are embedded in disks of active galactic nuclei (AGNs), and we investigate the γ-ray emission produced in the internal dissipation region via synchrotron, synchrotron self-Compton, and external inverse Compton (EIC) processes. In this scenario, isotropic thermal photons from the AGN disks contribute to the EIC component. We show that a low-density cavity can be formed in the migration traps, leading to the embedded mergers producing successful GRB jets. We find that the EIC component would dominate the GeV emission for typical CBO mergers with an isotropic-equivalent luminosity of L j,iso = 1048.5 erg s-1 that are located close to the central supermassive black hole. Considering a long-lasting jet of duration T dur ∼102-103 s, we find that the future Cherenkov Telescope Array (CTA) will be able to detect its 25-100 GeV emission out to a redshift z = 1.0. In the optimistic case, it is possible to detect the on-axis extended emission simultaneously with GWs within one decade using MAGIC, H.E.S.S., VERITAS, CTA, and LHAASO-WCDA. Early diagnosis of prompt emissions with Fermi-GBM and HAWC can provide valuable directional information for the follow-up observations.
| Original language | English |
|---|---|
| Article number | 80 |
| Journal | Astrophysical Journal |
| Volume | 932 |
| Issue number | 2 |
| DOIs | |
| State | Published - 1 Jun 2022 |
Bibliographical note
Publisher Copyright:© 2022. The Author(s). Published by the American Astronomical Society.
Funding
We thank B. Theodore Zhang, Mukul Bhattacharya, Zsuzsa Márka, and Szabolcs Márka for fruitful discussions. C.C.Y. and P.M. acknowledge support from the Eberly Foundation. The work of K.M. is supported by NSF grant Nos. AST-1908689, AST-2108466, and AST-2108467 and KAKENHI grant Nos. 20H01901 and 20H05852. A.P. is supported by the European Research Council via ERC consolidating grant 773062 (acronym O.M.J.). I.B. acknowledges the support of NSF under awards PHY-1911796 and PHY-2110060 and the Alfred P. Sloan Foundation.
| Funders | Funder number |
|---|---|
| Eberly Foundation | |
| National Science Foundation | 20H01901, AST-1908689, 20H05852, AST-2108466, AST-2108467 |
| Alfred P. Sloan Foundation | |
| Engineering Research Centers | 773062, PHY-2110060, PHY-1911796 |
| European Commission |