2004/02/12 by R. González‐Riestra, R. Gonzalez-Riestra, T. Oosterbroek +3 · 6 citations
Physics and Astronomy · #Absorption (acoustics) #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Astrophysics and Cosmic Phenomena #EPIC #Galaxy #Interstellar medium #Luminosity #Neutron star #Optics #Photon #Physics #Power law #Pulsars and Gravitational Waves Research #Spectral line #Transient (computer programming) #X-ray transient #astro-ph
paper · pdf · doi:10.1051/0004-6361:20035940
published as Astron.Astrophys. 420 (2004) 589-594 · Six pages, five figures; to appear in Astronomy and Astrophysics
arxiv created 2004/02/12 · openalex publication_date 2004/05/28 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
On September 17, 2003 INTEGRAL discovered a bright transient source 3° from the Galactic Center, IGR J17544-2619. The field containing the transient was observed by XMM-Newton on March 17 and September 11 and 17, 2003. A bright source, at a position consistent with the INTEGRAL location, was detected by the European Photon Imaging Camera (EPIC) during both September observations with mean 0.5-10 keV unabsorbed luminosities of and erg s-1 for an (assumed) distance of 8 kpc. The source was not detected in March 2003, with a 0.5-10 keV luminosity of < erg s-1. The September 11 and 17 EPIC spectra can be represented by a power-law model with photon indices of and , respectively. Thus, the 0.5-10 keV spectrum hardens with increasing intensity. The low-energy absorption during both September observations is comparable to the interstellar value. The X-ray lightcurves for both September observations show energy dependent flaring which may be modeled by changes in either low-energy absorption or power-law index.