The highly ionized disk wind of GRO J1655-40

Abstract

Aims: The galactic superluminal microquasar GRO J1655-40 started a new outburst in February 2005, after seven years in quiescence, rising to a high/soft state in March 2005. In this paper we study the X-ray spectra during this rise. Methods: We observed GRO J1655-40 with XMM-Newton, on 27 February 2005, in the low/hard state, and on three consecutive days in March 2005, during the rise of the source to its high/soft state. The EPIC-pn camera was used in the fast-read Burst mode to avoid photon pile-up. Results: First, we contributed to the improvement of the calibration of the EPIC-pn, since the high flux received from the source required some refinements in the correction of the Charge Transfer Efficiency of the camera.Second, we find that the X-ray spectrum of GRO J1655-40 is dominated in the high/soft state by the thermal emission from the accretion disk, with an inner radius of 13-14(D/3.2kpc)km and a maximum temperature of 1.3 keV. Two absorption lines are detected in the EPIC-pn spectra, at 6.7-6.8 and 7.8-8.0 keV, which can be identified either as blended Fe XXV and Fe XXVI K-alpha and K-beta lines, or as blueshifted Fe XXV. We find no orbital dependence on the X-ray properties, which provides an upper limit for the inclination of the system of 73 degr. The RGS spectrometers reveal interstellar absorption features at 17.2AA, 17.5AA (Fe L edges) and 23.54AA (OI K-alpha). Finally, while checking the interstellar origin of the OI line, we find a general correlation of the OI K-alpha line equivalent width with the hydrogen column density using several sources available in the literature.

10 pages, 7 figures, 4 tables. Revised version with important changes

References in corpus (22)

• On the Absorption of X-rays in the Interstellar Medium
• Atomic Data for Astrophysics. II. New Analytic Fits for Photoionization Cross Sections of Atoms and Ions
• Calibration of the Rossi X-ray Timing Explorer Proportional Counter Array
• Black Hole Spin in X-Ray Binaries: Observational Consequences
• An unusually massive stellar black hole in the Galaxy
• Optical Observations of GRO J1655-40 in Quiescence I: A Precise Mass for the Black Hole Primary
• The magnetic nature of disk accretion onto black holes
• Erratum: ASCA Observations of the Absorption-Line Features from the Super-Luminal Jet Source GRS 1915+105
• High-Resolution X-ray Spectroscopy of the Interstellar Medium: Structure at the Oxygen Absorption Edge
• High-Resolution X-ray Spectroscopy of the Interstellar Medium II: Neon and Iron Absorption Edges
• RXTE Spectral Observations of the 1996-97 Outburst of the Microquasar GRO J1655-40
• Interstellar X-ray Absorption Spectroscopy of Oxygen, Neon, and Iron with the Chandra LETGS Spectrum of X0614+091
• X-ray Absorption Line Spectroscopy of the Galactic Hot Interstellar Medium
• Warm-Hot Gas in and around the Milky Way: Detection and Implications of OVII Absorption toward LMC X-3
• The First High Resolution X-ray Spectrum of Cyg X-1: Soft X-Ray Ionization and Absorption
• Chandra Detection of Local OVII He-alpha Absorption Along the Sight Line Toward 3C 273
• The runaway black hole GRO J1655-40
• Absorption and scattering by interstellar dust: XMM-Newton observation of Cyg X-2
• The 2005 outburst of GRO J1655-40: spectral evolution of the rise, as observed by Swift
• The interstellar oxygen-K absorption edge as observed by XMM-Newton
• On the distance of GRO J1655-40
• Discovery of a red and blue shifted iron disk line in the galactic jet source GRO J1655-40

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• Angular Momentum Transport in Accretion Disks and its Implications for Spin Estimates in Black Hole Binaries
• Simulated spectral states of AGN and observational predictions
• Low/Hard State Spectra of GRO J1655-40 Observed with Suzaku
• Large Scale Cavities Surrounding Microquasars Inferred from Evolution of their Relativistic Jets
• XMM-Newton and INTEGRAL observations of the black hole candidate XTE J1817-330
• What is the closest black hole to the Sun?
• V5116 Sgr: a disc-eclipsed SSS post-outburst nova?
• New evidence on the origin of the microquasar GRO J1655-40