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Statements

Subject Item
n2:RIV%2F00216208%3A11320%2F11%3A10104674%21RIV12-GA0-11320___
rdf:type
skos:Concept n18:Vysledek
dcterms:description
Context. The H. E. S. S. Cherenkov telescope array has been surveying the Galactic plane for new VHE (}100 GeV) gamma-ray sources. Aims. We report on a newly detected point-like source, HESS J1943+213. This source coincides with an unidentified hard X-ray source IGR J19443+2117, which was proposed to have radio and infrared counterparts. Methods. We combine new H. E. S. S., Fermi/LAT and Nancay Radio Telescope observations with pre-existing non-simultaneous multi-wavelength observations of IGR J19443+2117 and discuss the likely source associations as well as the interpretation as an active galactic nucleus, a gamma-ray binary or a pulsar wind nebula. Results. HESS J1943+213 is detected at the significance level of 7.9 sigma (post-trials) at RA(J2000) = 19(h)43(m)55(s) +/- 1(stat)(s) +/- 1(sys)(s), Dec(J2000) = +21 degrees 18''8 '' +/- 17(stat)'' +/- 20(sys)''. The source has a soft spectrum with photon index Gamma = 3.1 +/- 0.3(stat) +/- 0.2(sys) and a flux above 470 GeV of (1.3 +/- 0.2(stat) +/- 0.3(sys)) x 10(-12) cm(-2) s(-1). There is no Fermi/LAT counterpart down to a flux limit of 6 x 10(-9) cm(-2) s(-1) in the 0.1-100 GeV energy range (95% confidence upper limit calculated for an assumed power-law model with a photon index Gamma = 2.0). The data from radio to VHE gamma-rays do not show any significant variability. Conclusions. The lack of a massive stellar counterpart disfavors the binary hypothesis, while the soft VHE spectrum would be very unusual in case of a pulsar wind nebula. In addition, the distance estimates for Galactic counterparts places them outside of the Milky Way. All available observations favor an interpretation as an extreme, high-frequency peaked BL Lac object with a redshift z } 0.14. This would be the first time a blazar is detected serendipitously from ground-based VHE observations, and the first VHE AGN detected in the Galactic Plane. Context. The H. E. S. S. Cherenkov telescope array has been surveying the Galactic plane for new VHE (}100 GeV) gamma-ray sources. Aims. We report on a newly detected point-like source, HESS J1943+213. This source coincides with an unidentified hard X-ray source IGR J19443+2117, which was proposed to have radio and infrared counterparts. Methods. We combine new H. E. S. S., Fermi/LAT and Nancay Radio Telescope observations with pre-existing non-simultaneous multi-wavelength observations of IGR J19443+2117 and discuss the likely source associations as well as the interpretation as an active galactic nucleus, a gamma-ray binary or a pulsar wind nebula. Results. HESS J1943+213 is detected at the significance level of 7.9 sigma (post-trials) at RA(J2000) = 19(h)43(m)55(s) +/- 1(stat)(s) +/- 1(sys)(s), Dec(J2000) = +21 degrees 18''8 '' +/- 17(stat)'' +/- 20(sys)''. The source has a soft spectrum with photon index Gamma = 3.1 +/- 0.3(stat) +/- 0.2(sys) and a flux above 470 GeV of (1.3 +/- 0.2(stat) +/- 0.3(sys)) x 10(-12) cm(-2) s(-1). There is no Fermi/LAT counterpart down to a flux limit of 6 x 10(-9) cm(-2) s(-1) in the 0.1-100 GeV energy range (95% confidence upper limit calculated for an assumed power-law model with a photon index Gamma = 2.0). The data from radio to VHE gamma-rays do not show any significant variability. Conclusions. The lack of a massive stellar counterpart disfavors the binary hypothesis, while the soft VHE spectrum would be very unusual in case of a pulsar wind nebula. In addition, the distance estimates for Galactic counterparts places them outside of the Milky Way. All available observations favor an interpretation as an extreme, high-frequency peaked BL Lac object with a redshift z } 0.14. This would be the first time a blazar is detected serendipitously from ground-based VHE observations, and the first VHE AGN detected in the Galactic Plane.
dcterms:title
HESS J1943+213: a candidate extreme BL Lacertae object HESS J1943+213: a candidate extreme BL Lacertae object
skos:prefLabel
HESS J1943+213: a candidate extreme BL Lacertae object HESS J1943+213: a candidate extreme BL Lacertae object
skos:notation
RIV/00216208:11320/11:10104674!RIV12-GA0-11320___
n18:predkladatel
n19:orjk%3A11320
n4:aktivita
n9:Z n9:P
n4:aktivity
P(GPP203/11/P363), P(LC527), Z(MSM0021620859)
n4:cisloPeriodika
1
n4:dodaniDat
n5:2012
n4:domaciTvurceVysledku
n11:9283439 n11:6144063
n4:druhVysledku
n15:J
n4:duvernostUdaju
n13:S
n4:entitaPredkladatele
n20:predkladatel
n4:idSjednocenehoVysledku
201940
n4:idVysledku
RIV/00216208:11320/11:10104674
n4:jazykVysledku
n21:eng
n4:klicovaSlova
gamma rays: general; BL Lacertae objects: individual: IGR J19443+2117; galaxies: active
n4:klicoveSlovo
n8:galaxies%3A%20active n8:BL%20Lacertae%20objects%3A%20individual%3A%20IGR%20J19443%2B2117 n8:gamma%20rays%3A%20general
n4:kodStatuVydavatele
DE - Spolková republika Německo
n4:kontrolniKodProRIV
[1D26E9CD5563]
n4:nazevZdroje
Astronomy and Astrophysics
n4:obor
n16:BF
n4:pocetDomacichTvurcuVysledku
2
n4:pocetTvurcuVysledku
180
n4:projekt
n14:GPP203%2F11%2FP363 n14:LC527
n4:rokUplatneniVysledku
n5:2011
n4:svazekPeriodika
529
n4:tvurceVysledku
Abramowski, A. Aharonian, F. Nedbal, Dalibor Acero, F. Rob, Ladislav
n4:wos
000289557200057
n4:zamer
n7:MSM0021620859
s:issn
0004-6361
s:numberOfPages
10
n12:doi
10.1051/0004-6361/201116545
n10:organizacniJednotka
11320