Spitzer Reveals Infrared Optically-Thin Synchrotron Emission from the Compact Jet of the Neutron Star X-Ray Binary 4U 0614+091

Abstract

Spitzer observations of the neutron star (ultra-compact) X-ray binary (XRB) 4U 0614+091 with the Infrared Array Camera reveal emission of non-thermal origin in the range 3.5-8 um. The mid-infrared spectrum is well fit by a power law with spectral index of alpha=-0.57+/-0.04 (where the flux density is F_nu \propto nu^(alpha)). Given the ultra-compact nature of the binary system, we exclude the possibility that either the companion star or the accretion disk can be the origin of the observed emission. These observations represent the first spectral evidence for a compact jet in a low-luminosity neutron star XRB and furthermore of the presence, already observed in two black hole (BH) XRBs, of a `break' in the synchrotron spectrum of such compact jets. We can derive a firm upper limit on the break frequency of the spectrum of nu_thin=3.7x10^(13) Hz, which is lower than that observed in BH XRBs by at least a factor of 10. Assuming a high-energy cooling cutoff at ~1 keV, we estimate a total (integrated up to X-rays) jet power to X-ray bolometric luminosity ratio of \~5%, much lower than that inferred in BHs.

Accepted for publication in ApJ Letters

References in corpus (31)

• Advection-Dominated Accretion: A Self-Similar Solution
• On the Fate of Gas Accreting at a Low Rate onto a Black Hole
• A Scheme to Unify Low-Power Accreting Black Holes - Jet-Dominated Accretion Flows and the Radio/X-Ray Correlation
• A universal radio/X-ray correlation in low/hard state black hole binaries
• Absolute Calibration of the Infrared Array Camera on the Spitzer Space Telescope
• Powerful jets from black hole X-ray binaries in Low/Hard X-ray states
• Radio / X-ray correlation in the low/hard state of GX 339--4
• A relativistic jet from Cygnus X-1 in the low/hard X-ray state
• Quenching of the radio jet during the X-ray high state of GX 339-4
• Jets in neutron star X-ray binaries: a comparison with black holes
• Point Source Extraction with MOPEX
• AU-Scale Synchrotron Jets and Superluminal Ejecta in GRS 1915+105
• Jet-dominated states: an alternative to advection across black hole event horizons in `quiescent' X-ray binaries
• Near-infrared synchrotron emission from the compact jet of GX339-4
• X-ray states and radio emission in the black hole candidate XTE J1550-564
• The radio luminosity of persistent X-ray binaries
• The X-ray transient XTE J1118+480: Multiwavelength observations of a low-state mini-outburst
• The remarkable rapid X-ray, ultraviolet, optical, and IR variability in the black hole XTE J1118+480
• The very flat radio - millimetre spectrum of Cygnus X-1
• Relations Between Timing Features and Colors in the X-Ray Binary 4U 0614+09
• Optical spectra of the carbon-oxygen accretion discs in the ultra-compact X-ray binaries 4U 0614+09, 4U 1543-624 and 2S 0918-549
• Ultracompact X-Ray Binaries with Neon-Rich Degenerate Donors
• The flat synchrotron spectra of partially self-absorbed jets revisited
• Disc-jet coupling in an atoll-type neutron star X-ray binary: 4U 1728-34 (GX 354-0)
• Constraints on the role of synchrotron X-rays from jets of accreting black holes
• Is the `IR Coincidence' Just That?
• The Optical Counterpart of the Accreting Millisecond Pulsar SAX J1808.4-3658 in Outburst: Constraints on the Binary Inclination
• Constraints on relativistic beaming from estimators of the unbeamed flux
• The X-ray Position and Optical Counterpart of the Accretion-Powered Millisecond Pulsar XTE J1814-338
• The Structure and Evolution of Circumbinary Disks in Cataclysmic Variable Systems
• The optical counterpart of XTE J0929-314, the third transient millisecond X-ray pulsar

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• The complete spectrum of the neutron star X-ray binary 4U0614+091
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• Simultaneous Chandra and VLA Observations of the Transitional Millisecond Pulsar PSR J1023+0038: Anti-correlated X-ray and Radio Variability
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• Outburst Morphology in the Soft X-ray Transient Aquila X-1
• A multiwavelength study of Cygnus X-1: the first mid-infrared spectroscopic detection of compact jets
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• Parallel tracks in infrared versus X-ray emission in black hole X-ray transient outbursts: a hysteresis effect?
• Galactic Binaries Can Explain the Fermi Galactic Center Excess and 511 keV Emission
• Observations of the 599 Hz Accreting X-ray Pulsar IGR J00291+5934 during the 2004 Outburst and in Quiescence
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• The Double-Peaked 2008 Outburst of the Accreting Milli-Second X-ray Pulsar, IGR J00291+5934
• Optical and near-infrared spectroscopy of the black hole GX 339-4: I. A focus on the continuum in the low/hard and high/soft states
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• INTEGRAL spectral variability study of the atoll 4U 1820-30: first detection of hard X-ray emission
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• The Fermi-GBM X-ray burst monitor: thermonuclear bursts from 4U 0614+09
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• Long Term Simulations Of Astrophysical Jets; Energy Structure and Quasi-Periodic Ejection