{"id":{"repo_id":"heid-diss","oai_identifier":"oai:archiv.ub.uni-heidelberg.de:5542"},"canonical_url":"https://search.dev.ndltd.org/etd/heid-diss/oai:archiv.ub.uni-heidelberg.de:5542","repository":{"repo_id":"heid-diss","name":"Universität Heidelberg","base_url":"http://archiv.ub.uni-heidelberg.de/volltextserver/cgi/oai2"},"display":{"title":"A new population of very high-energy gamma-ray sources detected with H.E.S.S. in the inner part of the Milky Way","abstract":"The H.E.S.S., experiment (High Energy Stereoscopic System) is an array of four imaging Cherenkov telescopes designed to detect gamma-rays in the energy domain above 100 GeV. The telescopes utilise the stereoscopic approach, in which particle showers in the atmosphere are observed by several telescopes simultaneously, connected by a central trigger system at the hardware level. This approach greatly reduces the background of the instrument and thereby allows one to decrease the energy threshold and improve the sensitivity of the system. The functionality and performance of the central trigger of H.E.S.S., is presented. Making use of the reduced energy threshold and the improved sensitivity, a survey of the inner part of the Milky way in very high energy gamma-rays, was conducted in 2004 with H.E.S.S. at an unprecedented sensitivity level. The Galactic plane between +- 30deg, in longitude and +-3deg, in latitude relative to the Galactic centre was observed for a total of 230 hours, reaching an average flux sensitivity of 3% of the Crab nebula at energies above 200 GeV. Fourteen new sources were detected at a significance level greater than 4 sigma in addition to three previously known sources in this area. Detailed spectral and morphological information for these new sources are provided, along with a discussion on possible counterparts in other wavelength bands. The distribution in galactic latitude of the detected sources appears to be consistent with a scale height in the galactic disc for the parent population of less than 100 parsec.","abstract_html":"The H.E.S.S., experiment (High Energy Stereoscopic System) is an array of four imaging Cherenkov telescopes designed to detect gamma-rays in the energy domain above 100 GeV. The telescopes utilise the stereoscopic approach, in which particle showers in the atmosphere are observed by several telescopes simultaneously, connected by a central trigger system at the hardware level. This approach greatly reduces the background of the instrument and thereby allows one to decrease the energy threshold and improve the sensitivity of the system. The functionality and performance of the central trigger of H.E.S.S., is presented. Making use of the reduced energy threshold and the improved sensitivity, a survey of the inner part of the Milky way in very high energy gamma-rays, was conducted in 2004 with H.E.S.S. at an unprecedented sensitivity level. The Galactic plane between +- 30deg, in longitude and +-3deg, in latitude relative to the Galactic centre was observed for a total of 230 hours, reaching an average flux sensitivity of 3% of the Crab nebula at energies above 200 GeV. Fourteen new sources were detected at a significance level greater than 4 sigma in addition to three previously known sources in this area. Detailed spectral and morphological information for these new sources are provided, along with a discussion on possible counterparts in other wavelength bands. The distribution in galactic latitude of the detected sources appears to be consistent with a scale height in the galactic disc for the parent population of less than 100 parsec.","abstract_has_math":false,"creators":["Funk, Stefan"],"institution":"Universität Heidelberg","degree_name":null,"degree_level":"thesis.doctoral","degree_discipline":null,"degree_department":null,"school":null,"contributors":["Hofmann, Werner"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2005,"date_issued":"2005-07-06","date_published":"2005-07-06","updated_at":"2026-07-24T02:30:04Z","subjects":[],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://www.ub.uni-heidelberg.de/archiv/5542","outbound_label":"Repository record","outbound_source":"source_url"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Hofmann, Werner"]},{"key":"dc:creator","label":"Author","values":["Funk, Stefan"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:publisher","label":"Institution","values":["Universitätsbibliothek Heidelberg"]},{"key":"dc:type","label":"Dc Type","values":["doctoralThesis"]},{"key":"thesis:degree_level","label":"Degree Level","values":["thesis.doctoral"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Universität Heidelberg"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The H.E.S.S., experiment (High Energy Stereoscopic System) is an array of four imaging Cherenkov telescopes designed to detect gamma-rays in the energy domain above 100 GeV. The telescopes utilise the stereoscopic approach, in which particle showers in the atmosphere are observed by several telescopes simultaneously, connected by a central trigger system at the hardware level. This approach greatly reduces the background of the instrument and thereby allows one to decrease the energy threshold and improve the sensitivity of the system. The functionality and performance of the central trigger of H.E.S.S., is presented. Making use of the reduced energy threshold and the improved sensitivity, a survey of the inner part of the Milky way in very high energy gamma-rays, was conducted in 2004 with H.E.S.S. at an unprecedented sensitivity level. The Galactic plane between +- 30deg, in longitude and +-3deg, in latitude relative to the Galactic centre was observed for a total of 230 hours, reaching an average flux sensitivity of 3% of the Crab nebula at energies above 200 GeV. Fourteen new sources were detected at a significance level greater than 4 sigma in addition to three previously known sources in this area. Detailed spectral and morphological information for these new sources are provided, along with a discussion on possible counterparts in other wavelength bands. The distribution in galactic latitude of the detected sources appears to be consistent with a scale height in the galactic disc for the parent population of less than 100 parsec.","Das H.E.S.S., Experiment besteht aus einem stereoskopischen System von vier Teleskopen. Ziel des Experiments ist die Untersuchung von Quellen hochenergetischer kosmischer gamma-Strahlung im Energiebereich oberhalb von 100 GeV. Die eingesetzte Technik beruht auf der stereoskopischen Beobachtung von Luftschauern mit mehreren Teleskopen. Dazu werden die Teleskope bereits auf dem Triggerlevel durch einen zentralen Trigger miteinander verschaltet. Durch den Einsatz dieses zentralen Triggers werden Untergrundereignisse massiv unterdrückt, wodurch es möglich ist, die Energieschwelle zu senken und die Sensitivität zu erhöhen. Funktionsweise und Messungen zur Charakterisierung des zentralen Triggersystems werden vorgestellt. Unter Zuhilfenahme der reduzierten Energieschwelle und erhöhten Sensitivität wurde eine Durchmusterung der Galaktischen Ebene im Sommer 2004 durchgeführt. Hierbei wurde der Bereich +-30deg in galaktischer Länge und +-3deg in galaktischer Breite um das Zentrum der Milchstrasse 230 Stunden lang nach Quellen hochenergetischer gamma-Strahlung abgesucht. Die durchschnittliche Sensitivität die hierbei erreicht wurde entspricht etwa 3% des Flusses des Krebs-Nebels oberhalb der Energieschwelle von 200 GeV. Vierzehn neue Quellen hochenergetischer gamma-Strahlung wurden oberhalb einer Signifikanzschwelle von 4 sigma detektiert. Detaillierte spektrale und morpholgische Untersuchungen dieser neuen Quellen werden vorgestellt, gefolgt von einer Diskussion möglicher Gegenstücke in anderen Wellenlängenbereichen. Es wird gezeigt, dass die Verteilung der neuen Quellen in galaktischer Breite mit einer Population von Supernovaüberresten mit Skalenhöhe von 100 pc der galaktischen Ebene konsistent ist."]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["A new population of very high-energy gamma-ray sources detected with H.E.S.S. in the inner part of the Milky Way","Eine neue Population von Quellen hochenergetischer Gammastrahlung im Inneren der Milchstrasse"]}]}],"canonical_facts":{"dc:contributor":["Hofmann, Werner"],"dc:creator":["Funk, Stefan"],"dc:description.abstract":["The H.E.S.S., experiment (High Energy Stereoscopic System) is an array of four imaging Cherenkov telescopes designed to detect gamma-rays in the energy domain above 100 GeV. The telescopes utilise the stereoscopic approach, in which particle showers in the atmosphere are observed by several telescopes simultaneously, connected by a central trigger system at the hardware level. This approach greatly reduces the background of the instrument and thereby allows one to decrease the energy threshold and improve the sensitivity of the system. The functionality and performance of the central trigger of H.E.S.S., is presented. Making use of the reduced energy threshold and the improved sensitivity, a survey of the inner part of the Milky way in very high energy gamma-rays, was conducted in 2004 with H.E.S.S. at an unprecedented sensitivity level. The Galactic plane between +- 30deg, in longitude and +-3deg, in latitude relative to the Galactic centre was observed for a total of 230 hours, reaching an average flux sensitivity of 3% of the Crab nebula at energies above 200 GeV. Fourteen new sources were detected at a significance level greater than 4 sigma in addition to three previously known sources in this area. Detailed spectral and morphological information for these new sources are provided, along with a discussion on possible counterparts in other wavelength bands. The distribution in galactic latitude of the detected sources appears to be consistent with a scale height in the galactic disc for the parent population of less than 100 parsec.","Das H.E.S.S., Experiment besteht aus einem stereoskopischen System von vier Teleskopen. Ziel des Experiments ist die Untersuchung von Quellen hochenergetischer kosmischer gamma-Strahlung im Energiebereich oberhalb von 100 GeV. Die eingesetzte Technik beruht auf der stereoskopischen Beobachtung von Luftschauern mit mehreren Teleskopen. Dazu werden die Teleskope bereits auf dem Triggerlevel durch einen zentralen Trigger miteinander verschaltet. Durch den Einsatz dieses zentralen Triggers werden Untergrundereignisse massiv unterdrückt, wodurch es möglich ist, die Energieschwelle zu senken und die Sensitivität zu erhöhen. Funktionsweise und Messungen zur Charakterisierung des zentralen Triggersystems werden vorgestellt. Unter Zuhilfenahme der reduzierten Energieschwelle und erhöhten Sensitivität wurde eine Durchmusterung der Galaktischen Ebene im Sommer 2004 durchgeführt. Hierbei wurde der Bereich +-30deg in galaktischer Länge und +-3deg in galaktischer Breite um das Zentrum der Milchstrasse 230 Stunden lang nach Quellen hochenergetischer gamma-Strahlung abgesucht. Die durchschnittliche Sensitivität die hierbei erreicht wurde entspricht etwa 3% des Flusses des Krebs-Nebels oberhalb der Energieschwelle von 200 GeV. Vierzehn neue Quellen hochenergetischer gamma-Strahlung wurden oberhalb einer Signifikanzschwelle von 4 sigma detektiert. Detaillierte spektrale und morpholgische Untersuchungen dieser neuen Quellen werden vorgestellt, gefolgt von einer Diskussion möglicher Gegenstücke in anderen Wellenlängenbereichen. Es wird gezeigt, dass die Verteilung der neuen Quellen in galaktischer Breite mit einer Population von Supernovaüberresten mit Skalenhöhe von 100 pc der galaktischen Ebene konsistent ist."],"dc:format.medium":["application/pdf"],"dc:publisher":["Universitätsbibliothek Heidelberg"],"dc:title":["A new population of very high-energy gamma-ray sources detected with H.E.S.S. in the inner part of the Milky Way","Eine neue Population von Quellen hochenergetischer Gammastrahlung im Inneren der Milchstrasse"],"dc:type":["doctoralThesis"],"thesis:degree_level":["thesis.doctoral"],"thesis:institution_name":["Universität Heidelberg"]},"updated_at":"2026-07-24T02:30:04Z"}