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Title: MAGIC detection of very high energy γ-ray emission from the low-luminosity blazar 1ES 1741+196

Journal Article · · Monthly Notices of the Royal Astronomical Society
DOI:https://doi.org/10.1093/mnras/stx472· OSTI ID:1355724
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Here, we present the first detection of the nearby (z = 0.084) low-luminosity BL Lac object 1ES 1741+196 in the very high energy (E > 100 GeV) band. This object lies in a triplet of interacting galaxies. Early predictions had suggested 1ES 1741+196 to be, along with several other high-frequency BL Lac sources, within the reach of MAGIC detectability. Its detection by MAGIC, later confirmed by VERITAS, helps to expand the small population of known TeV BL Lacs. The source was observed with the MAGIC telescopes between 2010 April and 2011 May, collecting 46 h of good quality data. These observations led to the detection of the source at 6.0 σ confidence level, with a steady flux F(>100 GeV) = (6.4 ± 1.7stat ± 2.6syst) × 10–12 ph cm–2s–1 and a differential spectral photon index Γ = 2.4 ± 0.2stat ± 0.2syst in the range of ~80 GeV–3 TeV. To study the broad-band spectral energy distribution (SED) simultaneous with MAGIC observations, we use KVA, Swift/UVOT and XRT and Fermi/LAT data. One-zone synchrotron-self-Compton (SSC) modelling of the SED of 1ES 1741+196 suggests values for the SSC parameters that are quite common among known TeV BL Lacs except for a relatively low Doppler factor and slope of electron energy distribution. A thermal feature seen in the SED is well matched by a giant elliptical's template. As a result, this appears to be the signature of thermal emission from the host galaxy, which is clearly resolved in optical observations.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515; FPA2015-69818-P; FPA2012-36668; FPA2015-68278-P; FPA2015-69210-C6-2-R; FPA2015-69210-C6-4-R; FPA2015-69210-C6-6-R; AYA2013-47447-C3-1-P; AYA2015-71042-P; ESP2015-71662-C2-2-P; CSD2009-00064
OSTI ID:
1355724
Journal Information:
Monthly Notices of the Royal Astronomical Society, Vol. 468, Issue 2; ISSN 0035-8711
Publisher:
Royal Astronomical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections text January 2005
The Burst Alert Telescope (BAT) on the Swift MIDEX Mission text January 2005
The Swift Ultra-Violet/Optical Telescope text January 2005
The Swift X-ray Telescope text January 2005
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Cited By (4)

GeV-TeV γ $\gamma $ -ray energy spectral break of BL Lac objects journal August 2018
New Hard-TeV Extreme Blazars Detected with the MAGIC Telescopes journal February 2020
New Hard-TeV Extreme Blazars Detected with the MAGIC Telescopes text January 2020
New hard-TeV extreme blazars detected with the MAGIC telescopes text January 2019

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
BL Lacertae objects: individual: (1ES 1741+196)
gamma-rays: galaxies