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INTEGRAL/XMM views on the MeV source GRO J1411-64 |
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| Authors: | Diego F Torres Shu Zhang Olaf Reimer Xavier Barcons Amalia Corral Valentí Bosch-Ramon Josep M Paredes Gustavo E Romero Jin Qu Werner Collmar Volker Schönfelder Yousaf Butt |
| Institution: | 1. Institució de Recerca i Estudis Avan?ats (ICREA) & Institut de Ciències de l’Espai (IEEC-CSIC), Facultat de Ciencies, Universitat Autònoma de Barcelona, Torre C5 Parell, 2a planta, 08193, Barcelona, Spain 2. Laboratory for Particle Astrophysics, Institute of High Energy Physics, Beijing 100049, China 3. W.W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305, USA 4. Instituto de Física de Cantabria (CSIC-UC), 39005, Santander, Spain 5. Universitat de Barcelona, Av. Diagonal 647, 08028, Barcelona, Spain 6. Instituto Argentino de Radioastronomia, CC5, 1894, Villa Elisa, Argentina 7. Max-Planck-Institut für extraterrestrische Physik, P.O. Box 1603, 85740, Garching, Germany 8. Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA, 02138, USA |
| Abstract: | The COMPTEL unidentified source GRO J 1411-64 was observed by INTEGRAL and XMM-Newton in 2005. The Circinus Galaxy is the only source detected within the 4σ location error of GRO J1411-64, but in here excluded as the possible counterpart. At soft X-rays, 22 reliable and statistically significant sources (likelihood >10) were extracted and analyzed from XMM-Newton data. Only one of these sources, XMMU J141255.6-635932, is spectrally compatible with GRO J1411-64 although the fact the soft X-ray observations do not cover the full extent of the COMPTEL source position uncertainty make an association hard to quantify and thus risky. At the best location of the source, detections at hard X-rays show only upper limits, which, together with MeV results obtained by COMPTEL suggest the existence of a peak in power output located somewhere between 300–700 keV for the so-called low state. Such a spectrum resembles those in blazars or microquasars, and might suggest at work by the models accordingly. However, an analysis using a microquasar model consisting on a magnetized conical jet filled with relativistic electrons, shows that it is hard to comply with all observational constrains. This fact and the non-detection at hard X-rays introduce an a-posteriori question mark upon the physical reality of this source, what is discussed here. |
| Keywords: | γ -Rays Unidentified γ -ray sources |
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