Investigating the peculiar emission from the new VHE gamma-ray source H1722+119
Abstract
The Major Atmospheric Gamma-ray Imaging Cherenkov (MAGIC) telescopes ob- served the BL Lac object H1722+119 (redshift unknown) for six consecutive nights between 2013 May 17 and 22, for a total of 12.5 h. The observations were triggered by high activity in the optical band measured by the KVA (Kungliga Vetenskap- sakademien) telescope. The source was for the first time detected in the very high energy (VHE, E > 100GeV) γ-ray band with a statistical significance of 5.9 σ. The integral flux above 150GeV is estimated to be (2.0±0.5) per cent of the Crab Nebula flux. We used contemporaneous high energy (HE, 100MeV < E < 100GeV) γ-ray observations from Fermi-LAT (Large Area Telescope) to estimate the redshift of the source. Within the framework of the current extragalactic background light models, we estimate the redshift to be z = 0.34±0.15. Additionally, we used contemporaneous X-ray to radio data collected by the instruments on board the Swift satellite, the KVA, and the OVRO (Owens Valley Radio Observatory) telescope to study multifrequency characteristics of the source. We found no significant temporal variability of the flux in the HE and VHE bands. The flux in the optical and radio wavebands, on the other hand,more »
- Authors:
-
- ETH Zurich (Switzerland), et al.
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- The MAGIC Collaboration; for the Fermi-LAT Collaboration
- OSTI Identifier:
- 1355682
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Volume: 459; Journal Issue: 3; Journal ID: ISSN 0035-8711
- Publisher:
- Royal Astronomical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Ahnen, M. L. Investigating the peculiar emission from the new VHE gamma-ray source H1722+119. United States: N. p., 2016.
Web. doi:10.1093/mnras/stw689.
Ahnen, M. L. Investigating the peculiar emission from the new VHE gamma-ray source H1722+119. United States. https://doi.org/10.1093/mnras/stw689
Ahnen, M. L. Mon .
"Investigating the peculiar emission from the new VHE gamma-ray source H1722+119". United States. https://doi.org/10.1093/mnras/stw689. https://www.osti.gov/servlets/purl/1355682.
@article{osti_1355682,
title = {Investigating the peculiar emission from the new VHE gamma-ray source H1722+119},
author = {Ahnen, M. L.},
abstractNote = {The Major Atmospheric Gamma-ray Imaging Cherenkov (MAGIC) telescopes ob- served the BL Lac object H1722+119 (redshift unknown) for six consecutive nights between 2013 May 17 and 22, for a total of 12.5 h. The observations were triggered by high activity in the optical band measured by the KVA (Kungliga Vetenskap- sakademien) telescope. The source was for the first time detected in the very high energy (VHE, E > 100GeV) γ-ray band with a statistical significance of 5.9 σ. The integral flux above 150GeV is estimated to be (2.0±0.5) per cent of the Crab Nebula flux. We used contemporaneous high energy (HE, 100MeV < E < 100GeV) γ-ray observations from Fermi-LAT (Large Area Telescope) to estimate the redshift of the source. Within the framework of the current extragalactic background light models, we estimate the redshift to be z = 0.34±0.15. Additionally, we used contemporaneous X-ray to radio data collected by the instruments on board the Swift satellite, the KVA, and the OVRO (Owens Valley Radio Observatory) telescope to study multifrequency characteristics of the source. We found no significant temporal variability of the flux in the HE and VHE bands. The flux in the optical and radio wavebands, on the other hand, did vary with different patterns. The spectral energy distribution (SED) of H1722+119 shows surprising behaviour in the ~ 3×1014-1018 Hz frequency range. It can be modelled using an inhomogeneous helical jet synchrotron self-Compton model.},
doi = {10.1093/mnras/stw689},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 459,
place = {United States},
year = {Mon Mar 28 00:00:00 EDT 2016},
month = {Mon Mar 28 00:00:00 EDT 2016}
}
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Figure 1: θ2 distribution of signal (black points) and background (grey area) events. Non is the number of all events with θ2 < 0.0125 deg2 (vertical dashed line) with respect to the source position in the camera, and Noff the normalised number of all events from the same region aroundmore »
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