Looking for blazars in a sample of unidentified high-energy emittingFermisources
| العنوان: | Looking for blazars in a sample of unidentified high-energy emittingFermisources |
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| المؤلفون: | N. Masetti, Angela Malizia, V. H. Chavushyan, Sergio A. Cellone, Eliana Palazzi, E. J. Marchesini, John B. Stephen, G. Rodriguez-Castillo, Elena Jiménez-Bailón, Ileana Andruchow, R. Landi, Angela Bazzano, Pietro Ubertini, L. Bassani, Víctor M. Patiño-Álvarez |
| المساهمون: | ITA |
| المصدر: | NASA Astrophysics Data System CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET SEDICI (UNLP) Universidad Nacional de La Plata instacron:UNLP |
| بيانات النشر: | EDP Sciences, 2016. |
| سنة النشر: | 2016 |
| مصطلحات موضوعية: | Ciencias Astronómicas, active [Galaxies], Ciencias Físicas, Gamma rays: general, general [Gamma rays], FOS: Physical sciences, Astrophysics, X-rays: general, 01 natural sciences, Nordic Optical Telescope, purl.org/becyt/ford/1 [https], general [X-rays], 0103 physical sciences, ROSAT, Spectroscopy, Blazar, 010303 astronomy & astrophysics, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, X rays, general [BL Lacertae objects], 010308 nuclear & particles physics, Gamma rays, Gamma ray, Astronomy and Astrophysics, Quasar, BL Lacertae objects: general, Galaxies: active, purl.org/becyt/ford/1.3 [https], Redshift, Astronomía, Space and Planetary Science, Active galaxies, BL Lacertae objects, Astrophysics - High Energy Astrophysical Phenomena, CIENCIAS NATURALES Y EXACTAS, Fermi Gamma-ray Space Telescope |
| الوصف: | Context. Based on their overwhelming dominance among associated Fermi γ-ray catalogue sources, it is expected that a large fraction of the unidentified Fermi objects are blazars. Through crossmatching between the positions of unidentified γ-ray sources from the First Fermi Catalog of γ-ray sources emitting above 10 GeV (1FHL) and the ROSAT and Swift/XRT catalogues of X-ray objects and between pointed XRT observations, a sample of 36 potential associations was found in previous works with less than 15 arcsec of positional offset. One-third of them have recently been classified; the remainder, though believed to belong to the blazar class, still lack spectroscopic classifications. Aims. We study the optical spectrum of the putative counterparts of these unidentified gamma-ray sources in order to find their redshifts and to determine their nature and main spectral characteristics. Methods. An observational campaign was carried out on the putative counterparts of 13 1FHL sources using medium-resolution optical spectroscopy from the Osservatorio Astronomico di Bologna in Loiano, Italy; the Telescopio Nazionale Galileo and the Nordic Optical Telescope, both in the Canary Islands, Spain; and the Observatorio Astronómico Nacional San Pedro Mártir in Baja California, Mexico. Results. We were able to classify 14 new objects based on their continuum shapes and spectral features. Conclusions. Twelve new blazars were found, along with one new quasar and one new narrow line Seyfert 1 (NLS1) to be potentially associated with the 1FHL sources of our sample. Redshifts or lower limits were obtained when possible alongside central black hole mass and luminosity estimates for the NLS1 and the quasar. Facultad de Ciencias Astronómicas y Geofísicas Instituto de Astrofísica de La Plata |
| وصف الملف: | application/pdf |
| تدمد: | 1432-0746 0004-6361 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::974d38d33c8cae21bfae9525c08180dc https://doi.org/10.1051/0004-6361/201629028 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....974d38d33c8cae21bfae9525c08180dc |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14320746 00046361 |
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