RT Journal Article
T1 Morphological and spectral study of 4FGL J1115.1–6118 in the region of the young massive stellar cluster NGC 3603
A1 Saha, Lab
A1 Domínguez, Alberto
A1 Tibaldo, Luigi
A1 Marchesi, Stefano
A1 Ajello, Marco
A1 Lemoine-Goumard, Marianne
A1 López Moya, Marcos
AB We report a detailed study of an unidentified gamma-ray source located in the region of the compact stellar cluster NGC 3603. This is a star-forming region (SFR) powered by a massive cluster of OB stars. A dedicated analysis of about 10 yr of data from 10 GeV to 1 TeV, provided by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope, yields the detection of a pointlike source at a significance of 9 sigma. The source photon spectrum can be described by a power-law model with a best-fit spectral index of 2.35 0.03. In addition, the analysis of a deep Chandra image in the 0.5-7 keV band reliably rules out an extragalactic origin for the gamma-rays. We also conclude that the broadband spectral energy distribution of the point source can be explained well with both leptonic and hadronic models. No firm evidence of association with any other classes of known gamma-ray emitters is found; therefore, we speculate that 4FGL J1115.1-6118 is a gamma-ray-emitting SFR.
PB American Astronomical Society
SN 0004-637X
YR 2020
FD 2020
LK https://hdl.handle.net/20.500.14352/100939
UL https://hdl.handle.net/20.500.14352/100939
LA eng
NO Saha, L., Domínguez, A., Tibaldo, L., Marchesi, S. T. E. F. A. N. O., Ajello, M., Lemoine-Goumard, M., & López, M. (2020). Morphological and Spectral Study of 4FGL J1115. 1–6118 in the Region of the Young Massive Stellar Cluster NGC 3603. The Astrophysical Journal, 897(2), 131.
NO Está depositada la versión preprint del artículo
NO Ministerio de Economía y Competitividad (España)
NO Ramon and Cajal program
NO Istituto Nazionale Astrofisica (Italia)
NO Agenzia Spaziale Italiana
NO United States Department of Energy 
DS Docta Complutense
RD 6 abr 2025