Upper limits on TeV gamma-ray emission from Centaurus A, Vela X-1, Centaurus X-3, and Circinus X-1

1993 ◽  
Vol 405 ◽  
pp. 554 ◽  
Author(s):  
W. H. Allen ◽  
I. A. Bond ◽  
E. Budding ◽  
M. J. Conway ◽  
A. Daniel ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Upper Limits ◽  
Gamma Ray Emission ◽  
Centaurus A

scholarly journals Systematic search for very-high-energy gamma-ray emission from bow shocks of runaway stars

2018 ◽  
Vol 612 ◽  
pp. A12 ◽  
Author(s):  
◽  
H. Abdalla ◽  
A. Abramowski ◽  
F. Aharonian ◽  
F. Ait Benkhali ◽  
...  
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
Bow Shock ◽  
Systematic Search ◽  
Upper Limits ◽  
Very High Energy ◽  
Bow Shocks ◽  
Gamma Ray Emission ◽  
Runaway Stars ◽  
Very High

Context. Runaway stars form bow shocks by ploughing through the interstellar medium at supersonic speeds and are promising sources of non-thermal emission of photons. One of these objects has been found to emit non-thermal radiation in the radio band. This triggered the development of theoretical models predicting non-thermal photons from radio up to very-high-energy (VHE, E ≥ 0.1 TeV) gamma rays. Subsequently, one bow shock was also detected in X-ray observations. However, the data did not allow discrimination between a hot thermal and a non-thermal origin. Further observations of different candidates at X-ray energies showed no evidence for emission at the position of the bow shocks either. A systematic search in the Fermi-LAT energy regime resulted in flux upper limits for 27 candidates listed in the E-BOSS catalogue.Aim. Here we perform the first systematic search for VHE gamma-ray emission from bow shocks of runaway stars.Methods. Using all available archival H.E.S.S. data we search for very-high-energy gamma-ray emission at the positions of bow shock candidates listed in the second E-BOSS catalogue release. Out of the 73 bow shock candidates in this catalogue, 32 have been observed with H.E.S.S.Results. None of the observed 32 bow shock candidates in this population study show significant emission in the H.E.S.S. energy range. Therefore, flux upper limits are calculated in five energy bins and the fraction of the kinetic wind power that is converted into VHE gamma rays is constrained.Conclusions. Emission from stellar bow shocks is not detected in the energy range between 0.14 and 18 TeV.The resulting upper limits constrain the level of VHE gamma-ray emission from these objects down to 0.1–1% of the kinetic wind energy.

HEAO 3 upper limits to pulsed gamma-ray emission from PSR 1509 - 58 and PSR 0833 - 45

1991 ◽  
Vol 369 ◽  
pp. 485 ◽  
Author(s):  
M. P. Ulmer ◽  
W. R. Purcell ◽  
W. A. Wheaton ◽  
W. A. Mahoney
Keyword(s):  
Gamma Ray ◽  
Upper Limits ◽  
Gamma Ray Emission

Upper Limits on TeV Gamma-Ray Emission from Active Galactic Nuclei

1995 ◽  
Vol 452 ◽  
pp. 588 ◽  
Author(s):  
A. D. Kerrick ◽  
C. W. Akerlof ◽  
S. Biller ◽  
J. Buckley ◽  
D. A. Carter-Lewis ◽  
...  
Keyword(s):  
Active Galactic Nuclei ◽  
Gamma Ray ◽  
Galactic Nuclei ◽  
Upper Limits ◽  
Gamma Ray Emission

Sigma upper limits to the hard X-ray/soft gamma-ray emission from the millisecond pulsars of the nearby globular cluster 47 Tucunae

1993 ◽  
Vol 405 ◽  
pp. L59 ◽  
Author(s):  
D. Barret ◽  
P. Mandrou ◽  
M. Denis ◽  
J. F. Olive ◽  
P. Laurent ◽  
...  
Keyword(s):  
Globular Cluster ◽  
Gamma Ray ◽  
Millisecond Pulsars ◽  
X Ray ◽  
Upper Limits ◽  
Gamma Ray Emission

scholarly journals HESS upper limits on very high energy gamma-ray emission from the microquasar GRS 1915+105

2009 ◽  
Vol 508 (3) ◽  
pp. 1135-1140 ◽  
Author(s):  
◽  
F. Acero ◽  
F. Aharonian ◽  
A. G. Akhperjanian ◽  
G. Anton ◽  
...  
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
High Energy Gamma ◽  
Upper Limits ◽  
Very High Energy ◽  
Energy Gamma ◽  
Gamma Ray Emission ◽  
Very High

EGRET upper limits to the high-energy gamma-ray emission from the millisecond pulsars in nearby globular clusters

1994 ◽  
Vol 435 ◽  
pp. 218 ◽  
Author(s):  
P. F. Michelson ◽  
D. L. Bertsch ◽  
K. Brazier ◽  
J. Chiang ◽  
B. L. Dingus ◽  
...  
Keyword(s):  
Globular Clusters ◽  
Gamma Ray ◽  
High Energy ◽  
Millisecond Pulsars ◽  
High Energy Gamma ◽  
Upper Limits ◽  
Energy Gamma ◽  
Gamma Ray Emission

scholarly journals EGRET Upper Limits on the High‐Energy Gamma‐Ray Emission of Galaxy Clusters

2003 ◽  
Vol 588 (1) ◽  
pp. 155-164 ◽  
Author(s):  
O. Reimer ◽  
M. Pohl ◽  
P. Sreekumar ◽  
J. R. Mattox
Keyword(s):  
Galaxy Clusters ◽  
Gamma Ray ◽  
High Energy ◽  
High Energy Gamma ◽  
Upper Limits ◽  
Energy Gamma ◽  
Gamma Ray Emission

OSSE Observations of Gamma-Ray Emission from Centaurus A

1995 ◽  
Vol 449 ◽  
pp. 105 ◽  
Author(s):  
R. L. Kinzer ◽  
W. N. Johnson ◽  
C. D. Dermer ◽  
J. D. Kurfess ◽  
M. S. Strickman ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Emission ◽  
Centaurus A

OSSE Upper Limits to Pulsar Gamma-Ray Emission

1994 ◽  
Author(s):  
P. C. Schroeder ◽  
M. P. Ulmer ◽  
S. M. Matz ◽  
D. A. Grabelsky ◽  
W. R. Purcell ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Upper Limits ◽  
Gamma Ray Emission
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