2026-06-27T15:26:56Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/438962024-09-05T18:35:18Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Antoranz Canales, Pedro
author
Barrio Uña, Juan Abel
author
Contreras González, José Luis
author
Fonseca González, María Victoria
author
Miranda Pantoja, José Miguel
author
Nieto Castaño, Daniel
2023-06-20T03:34:02Z
2023-06-20T03:34:02Z
2011-03-10
0004-637X
10.1088/0004-637X/729/2/115
https://hdl.handle.net/20.500.14352/43896
http://dx.doi.org/10.1088/0004-637X/729/2/115
http://iopscience.iop.orghttp://arxiv.org/abs/1002.2951
Between 2004 and 2009, a sample of 28 X-ray selected high-and intermediate-frequency peaked blazars with an X-ray flux larger than 2 mu Jy at 1 keV in the redshift range from 0.018 to 0.361 was observed with the MAGIC telescope at energies above 100 GeV. Seven among them were detected and the results of these observations are discussed elsewhere. Here we concentrate on the remaining 21 blazars which were not detected during this observation campaign and present the 3 sigma (99.7%) confidence upper limits on their flux. The individual flux upper limits lie between 1.6% and 13.6% of the integral flux from the Crab Nebula. Applying a stacking method to the sample of non-detections with a total of 394.1 hr exposure time, we find evidence for an excess with a cumulative significance of 4.9 standard deviations. It is not dominated by individual objects or flares, but increases linearly with the observation time as for a constant source with an integral flux level of similar to 1.5% of that observed from the Crab Nebula above 150 GeV.
eng
Gamma-Ray excess from a stacked sample of high- and intermediate-frequency peaked blazars observed with the MAGIC telescope
journal article
URL
https://docta.ucm.es/bitstreams/0fedb5b7-e098-4774-97db-839456b9a297/download
File
MD5
21025e5c338678b3befab24847642bf1
422424
application/pdf
MirandaJM22libre.pdf
URL
https://docta.ucm.es/bitstreams/f5707475-41be-4370-90cd-8a26595f569e/download
File
MD5
6b694254bcfee78dec0e4ab894a99944
50625
text/plain
MirandaJM22libre.pdf.txt