Spectral Energy Distribution Modeling of BL Lacertae During a Large Submillimeter Outburst and Low X-Ray Polarization State
arXiv:2411.16249 · doi:10.3847/1538-4357/ad9603
Abstract
In 2023 October-November, the blazar BL Lacertae underwent a very large-amplitude submm outburst. The usual single-zone leptonic model with the lower energy peak of the spectral energy distribution (SED) fit by the synchrotron emission from one distribution of relativistic electrons in the jet and inverse-Compton (IC) scattering of lower energy photons from the synchrotron radiation in the jet itself (synchrotron self-Compton or SSC) or those from the broad line region and torus by the same distribution of electrons cannot satisfactorily fit the broadband SED with simultaneous data at submm--optical--X-ray--GeV energies. Furthermore, simultaneous observations with IXPE indicate the X-ray polarization is undetected. We consider two different synchrotron components, one for the high flux in the submm wavelengths and another for the data at the optical band, which are supposedly due to two separate distributions of electrons. In that case, the optical emission is dominated by the synchrotron radiation from one electron distribution while the X-rays are mostly due to SSC process by another, which may result in low polarization fraction due to the IC scattering. We show that such a model can fit the broadband SED satisfactorily as well as explain the low polarization fraction at the X-rays.
Accepted for publication in Astrophysical Journal (ApJ) on November 14, 2024, 13 pages with 4 figures and 6 tables
References in corpus (18)
- Incremental Fermi Large Area Telescope Fourth Source Catalog
- MOJAVE: XV. VLBA 15 GHz Total Intensity and Polarization Maps of 437 Parsec-Scale AGN Jets From 1996-2017
- Gamma-Ray Studies of Blazars: Synchro-Compton Analysis of Flat Spectrum Radio Quasars
- Multiwaveband Polarimetric Observations of 15 Active Galactic Nuclei at High Frequencies: Correlated Polarization Behavior
- Polarized Blazar X-rays imply particle acceleration in shocks
- The X-ray Polarization View of Mrk~421 in an Average Flux State as Observed by the Imaging X-ray Polarimetry Explorer
- Synchrotron and inverse-Compton emission from blazar jets I: a uniform conical jet model
- X-ray Polarization of BL Lacertae in Outburst
- X-ray Polarization Observations of BL Lacertae
- Long-term optical polarization variability and multiwavelength analysis of Blazar Mrk 421
- IXPE observation of PKS 2155-304 reveals the most highly polarized blazar
- The Polarization Behavior of Relativistic Synchrotron Self-Compton Jets
- A thirteen-year-long broadband view of BL Lac
- Multiwavelength Study of High-Redshift Blazars
- 3C 279 in Outburst in June 2015: A Broadband-SED Study Based on the INTEGRAL Detection
- Intra-night optical flux and polarization variability of BL~Lacertae during its 2020 2021 high state
- Optical polarization variations in the blazar PKS 1749+096
- XMM-NuSTAR Observation and Multiwavelength SED Modeling of Blazar 4FGL J1520.8-0348