Multiwavelength astrophysics of the blazar OJ 287 and the project MOMO

Creators: Komossa, S.; Kraus, A.; Grupe, D.; Parker, M. L.; Gonzalez, A; Gallo, L. C.; Gurwell, M. A.; Laine, S.; Yao, S.; Chandra, S.; Dey, L.; Gómez, J. L.; Hada, K.; Haggard, D.; Hollett, A. R.; Jermak, H.; Jorstad, S.; Krichbaum, T. P.; Markoff, S.; McCall, C.; Neilsen, J.; Nowak, M.

Abstract

We are carrying out the densest and longest multiyear, multiwavelength monitoring project of OJ 287 ever done. The project MOMO (Multiwavelength Observations and Modeling of OJ 287) covers wavelengths from the radio to the high-energy regime. A few selected observations are simultaneous with those of the Event Horizon Telescope (EHT). MOMO aims at understanding disk-jet physics and at testing predictions of the binary black hole scenario of OJ 287. Here, we present a discussion of extreme outburst and minima states in context, and then focus on the recent flux and spectral evolution between 2021 and May 2022, including an ongoing bright radio flare. Further, we show that there is no evidence for precursor flare activity in our optical–UV–X-ray light curves that would be associated with any secondary supermassive black hole (SMBH) disk impact and that was predicted to start as thermal flare on December 23, 2021.

Additional Information

© 2023 The Authors. Astronomische Nachrichten published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. S. Komossa would like to thank the Swift and XMM-Newton teams for carrying out our observations of OJ 287 and for very useful discussions on the observational set-ups. S. Komossa also thanks Ski Antonucci, Mauri Valtonen, and Staszek Zola for enlightening discussions on OJ 287, and our referee for their very useful comments. This research has made use of the XRT Data Analysis Software (XRTDAS) developed under the responsibility of the ASI Science Data Center (SSDC), Italy. This work is partly based on data obtained with the 100-m telescope of the Max-Planck-Institut für Radioastronomie at Effelsberg. The Submillimeter Array near the summit of Maunakea is a joint project between the Smithsonian Astrophysical Observatory and the Academia Sinica Institute of Astronomy and Astrophysics and is funded by the Smithsonian Institution and the Academia Sinica. The authors recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. This work made use of data supplied by the UK Swift Science Data Centre at the University of Leicester (Evans et al. 2007). This work has made use of public Fermi-LAT data (Kocevski et al. 2021). This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Open Access funding enabled and organized by Projekt DEAL.

Attached Files

Published - Astron_Nachr_-_2023_-_Komossa_-_Multiwavelength_astrophysics_of_the_blazar_OJ_287_and_the_project_MOMO.pdf

Files

Astron_Nachr_-_2023_-_Komossa_-_Multiwavelength_astrophysics_of_the_blazar_OJ_287_and_the_project_MOMO.pdf

Files (1.6 MB)

Name	Size	Download all
Astron_Nachr_-_2023_-_Komossa_-_Multiwavelength_astrophysics_of_the_blazar_OJ_287_and_the_project_MOMO.pdf md5:57506e95658bcf1423bdba04c03a77fe	1.6 MB	Preview Download

Additional details

	All versions	This version
Views	0	0
Downloads	0	0
Data volume	0 Bytes	0 Bytes