Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/45326
Title: INTEGRAL and XMM-Newton observations towards the unidentified MeV source GRO J1411-64.
Author: Torres, Diego F.
Zhang, Shu
Reimer, Olaf
Barcons, Xavier
Corral, Amalia
Bosch i Ramon, Valentí
Paredes i Poy, Josep Maria
Romero, Gustavo E.
Qu, Jin-Lu
Collmar, Werner
Schonfelder, V.
Butt, Yousaf
Keywords: Raigs X
Estels
Raigs gamma
Astronomia de raigs X
Astronomia de raigs gamma
Astrofísica
X-rays
Stars
Gamma rays
X-ray astronomy
Gamma ray astronomy
Astrophysics
Issue Date: 2006
Publisher: Springer Verlag
Abstract: The COMPTEL unidentified source GRO J1411-64 was observed by INTEGRAL, and its central part, also by XMM-Newton. The data analysis shows no hint for new detections at hard X-rays. The upper limits in flux herein presented constrain the energy spectrum of whatever was producing GRO J1411-64, imposing, in the framework of earlier COMPTEL observations, the existence of a peak in power output located somewhere between 300-700 keV for the so-called low state. The Circinus Galaxy is the only source detected within the 4$\sigma$ location error of GRO J1411-64, but can be safely excluded as the possible counterpart: the extrapolation of the energy spectrum is well below the one for GRO J1411-64 at MeV energies. 22 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. The unique peak of the power output at high energies (hard X-rays and gamma-rays) resembles that found in the SED seen in blazars or microquasars. However, an analysis using a microquasar model consisting on a magnetized conical jet filled with relativistic electrons which radiate through synchrotron and inverse Compton scattering with star, disk, corona and synchrotron photons shows that it is hard to comply with all observational constrains. This and the non-detection at hard X-rays introduce an a-posteriori question mark upon the physical reality of this source, which is discussed in some detail.
Note: Versió postprint del document publicat a: http://dx.doi.org/10.1051/0004-6361:20065346
It is part of: Astronomy and Astrophysics, 2006, vol. 457, p. 257-264
Related resource: http://dx.doi.org/10.1051/0004-6361:20065346
URI: http://hdl.handle.net/2445/45326
ISSN: 0004-6361
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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