Determining the Nature of the SS 433 Binary Using an X-ray Spectrum During Eclipse

Abstract

We test the physical model of the relativistic jets in the galactic X-ray binary SS 433 proposed in our previous paper using additional observations from the Chandra High Energy Transmission Grating Spectrometer. These observations sample two new orbital/precessional phase combinations. In the observation near orbital phase zero, the H- and He-like Fe lines from both receding and approaching jets are comparably strong and unocculted while the He-like Si line of the receding jet is significantly weaker than that of the approaching jet. This condition may imply the cooler parts of the receding jet are eclipsed by the companion. The X-ray spectrum from this observation has broader emission lines than obtained in Paper I that may arise from the divergence of a conical outflow or from Doppler shift variations during the observation. Using recent optical results, along with the length of the unobscured portion of the receding jet assuming adiabatic cooling, we calculate the radius of the companion to be 9.6+/-1.0 R_sun, about one third of the Roche lobe radius. For a main sequence star, this corresponds to a companion mass of 35+/-7 M_sun, giving a primary source mass of 20+/-5 M_sun. If our model is correct, this calculation indicates the compact object is a black hole, and accretion occurs through a wind process. In a subsequent paper, we will examine the validity of the adiabatic cooling model of the jets and test the mode of line broadening.

26 pages, 10 figures, accepted to ApJ

References in corpus (9)

• The Chandra High Energy Transmission Grating: Design, Fabrication, Ground Calibration and Five Years in Flight
• The High Resolution X-ray Spectrum of SS 433 using the Chandra HETGS
• The X-Ray Spectrum and Global Structure of the Stellar Wind in Vela X-1
• Identification of the Mass Donor Star's Spectrum in SS 433
• Spectral Components of SS 433
• The Ionized Stellar Wind in Vela X-1 During Eclipse
• The Evolutionary Status of SS433
• The Spectrum of the Mass Donor Star in SS 433
• Chandra Grating Spectroscopy of the X-ray Binary 4U 1700-37 in a Flaring State

Cited by in corpus (26)

• WATCHDOG: A Comprehensive All-Sky Database of Galactic Black Hole X-ray Binaries
• Evidence for simultaneous jets and disk winds in luminous low-mass X-ray binaries
• When Microquasar Jets and Supernova Collide: Hydrodynamically Simulating the SS433-W50 Interaction
• Multiwavelength Observations of the SS 433 Jets
• NuSTAR, XMM-Newton and Suzaku Observations of the Ultraluminous X-ray Source Holmberg II X-1
• The Nature of the Compact X-ray Source in Supernova Remnant RCW 103
• On the Nature of the Compact Object in SS~433. Observational Evidence of X-ray Photon Index Saturation
• Evidences of the supercritical disc funnel radiation in X-ray spectra of SS 433
• Parsec-Scale Bipolar X-ray Shocks Produced by Powerful Jets from the Neutron Star Circinus X-1
• Inflow and outflow from the accretion disc of the microquasar SS433: UKIRT spectroscopy
• CG X-1: an eclipsing Wolf-Rayet ULX in the Circinus galaxy
• Long-term simulation of MHD jet launching from an orbiting star-disk system
• Thermal X-ray emission from a baryonic jet: a self-consistent multicolour spectral model
• Spectroscopic Signatures of the Superorbital Period in the Neutron Star Binary LMC X-4
• Suzaku and Optical Spectroscopic Observations of SS 433 in the 2006 April Multiwavelength Campaign
• A Multi-Wavelength Study of the Western Lobe of W50 Powered by the Galactic Microquasar SS 433
• An upper limit on nickel overabundance in the supercritical accretion disk wind of SS 433 from X-ray spectroscopy
• Diagnostics of Parameters for the X-ray Jets of SS 433 from High-Resolution Chandra Spectroscopy
• X-ray panorama of the SS433/W50 complex by SRG/eROSITA
• X-ray line formation in the spectrum of SS 433
• On the Formation of SS433
• Relativistic Outflows in two quasars in the Chandra Deep Field South
• Spectral and photometric variability of SS 433 observed with XRISM and simultaneous optical and near-infrared telescopes
• Infrared interferometry to spatially and spectrally resolve jets in X-ray binaries
• Stochastic Wobble of Accretion Discs and Jets from Turbulent Rocket Torques
• Modeling the SS 433 Jet Bends