| Canonical Name: | LS 5039 |
| TeVCat Name: | TeV J1826-148 |
| Other Names: | HESS J1826-148
2HWC J1825-134 |
| Source Type: | Binary |
| R.A.: | 18 26 15 (hh mm ss) |
| Dec.: | -14 49 30 (dd mm ss) |
| Gal Long: | 16.90 (deg) |
| Gal Lat: | -1.28 (deg) |
| Distance: | 2.5 kpc |
| Flux: | 0.03 (Crab Units) |
| Energy Threshold: | 220 GeV |
| Spectral Index: | |
| Extended: | No |
| Discovery Date: | 2005-07 |
| Discovered By: | H.E.S.S. |
| TeVCat SubCat: | Default Catalog |
Source Notes:
| H.E.S.S. Galactic Plane Survey (HGPS, 2018): |
| A selection of information for each of the 78 sources in the HGPS is provided in TeVCat. For full details, visit the HGPS website. |
| Name: | HESS J1826-148 |
| Source Class: | Binary |
| Identified Object: | LS 5039 |
| R.A. (J2000): | 276.56 deg (18 26 15) |
| Dec. (J2000): | -14.85 deg (-14 50 50) |
| Positional uncertainty: | 0.012 deg |
| Spatial Model: | Gaussian |
| Size: | N/A |
| Spectral Model: | power law |
| Integral Flux > 1 TeV: | 8.35e-13 +/- 7.69e-14 cm-2 s-1 |
| Pivot Energy, E0: | 1.05 TeV |
| Diff. Flux at E0: | 9.82e-13 +/- 7.41e-14 cm-2 s-1 TeV-1 |
| Spectral Index: | 2.32 +/- 0.07 |
| HGPS Source Notes: | |
| | |
This is one of the 31 firmly-identified objects among the HGPS sources. Three possible associations are listed in Table A.9. "This is a
list of astronomical objects, extracted from catalogs of plausible counterparts, which are are found to be spatially coincident with the HGPS source":
- LS 5039 (EXTRA)
- 3FGL J1826.2-1450 (3FGL)
- 2FHL J1826.3-1450 (2FHL)
"EXTRA associations: For completeness, in addition to the associations obtained through the catalog-based, automatic procedure, we add a list of 20 extra
associated objects that are plausible counterparts for some HGPS sources and are not covered by the limited set of catalogs we use."
Source position and its uncertainty:
From
Aharonian et al. (2005):
- R.A.(J2000): 18 26 15 +/- 32"(stat) +/- 30"(syst)
- Dec.(J2000): -14 49 30 +/- 32"(stat) +/- 30"(syst)
From
Aharonian et al. (2006):
- l: 16.879 +/- 12"(stat) +/- 20"(syst) (position converts to R.A.(J2000): 18 26 13.83)
- b: -1.285 +/- 12"(stat) +/- 20"(syst) (position converts to Dec.(J2000): -14 50 55.4)
From HESS
Online Catalog:
- R.A. (J2000): 18:26:15
- Dec. (J2000): -14:49:30
Source Association:
From
Abeysekara et al. (2017):
- this is one of three sources potentially associated with
2HWC J1825-134
Spectral information:
From
Abeysekara et al. (2020):
- "Fitting a power law to the spectrum for each orbital phase interval
gives a photon index of:
... 2.1 +/- 0.2 stat +/- 0.2 sys near inferior conjunction
and
... 2.4 +/- 0.5 stat +/- 0.2 sys near superior conjunction"
Flux:
From
Abeysekara et al. (2020):
- "The flux above 1 TeV is:
... (2.5 +/- 0.4stat +/- 0.5sys) x10e-12 cm-2 s-1 near inferior conjunction
(orbital phase 0.45 < phase ≤ 0.9, 232 minutes exposure)
... and (7.8 +/- 2.8stat +/- 1.6sys) ×10e-13 cm-2 s-1 near superior conjunction
(orbital phase 0.0 ≤ phase ≤ 0.45 and 0.9 < phase ≤ 1.0, 230 minutes)"
Pevatron Candidate:
From
Alfaro et al. (2025):
- "In this work, we present new observations of LS 5039 obtained with
the High Altitude Water Cherenkov (HAWC) observatory. Our data reveal
that the gamma-ray spectrum of LS 5039 extends up to 200 TeV with no
apparent spectral cut-off. Furthermore, we confirm, with a confidence
level of 4.7 sigma, that the emission between 2 TeV and 118 TeV is
modulated by the orbital motion of the system, which indicates that
these photons are likely produced within or near the binary orbit
where they can undergo absorption by the stellar photons. In a
leptonic scenario, the highest energy photons detected by HAWC can be
emitted by approx. 200 TeV electrons inverse Compton scattering
stellar photons, which would require an extremely efficient
acceleration mechanism operating within LS 5039. Alternatively, a
hadronic scenario could explain the data through proton-proton or
proton-gamma collisions of protons accelerated to peta-electronvolt
(PeV) energies."
Seen by: H.E.S.S., HAWC, VERITAS
-
Orbital Modulation of Gamma-Rays Beyond 100 TeV from LS 5039
Alfaro, R. et al., arXiv e-prints parXiv:2503.20947 (2025) [LINK]
-
Investigating the Potential of LS 5039 as a Triple System Using Fermi-LAT Data
Zeng, Lujun et al., arXiv e-prints parXiv:2409.09908 (2024) [LINK]
-
PeV proton acceleration in Gamma-ray Binaries
Bykov, A.M. et al., arXiv e-prints parXiv:2401.06271 (2024) [LINK]
-
Unveiling properties of the non-thermal X-ray production in the gamma-ray binary LS 5039 using the long-term pattern of its fast X-ray variability
Yoneda, Hiroki et al., arXiv e-prints parXiv:2303.12587 (2023) [LINK]
-
3D RMHD simulations of the Gamma-ray binaries
Barkov, Maxim V. et al., arXiv e-prints parXiv:2211.12053 (2022) [LINK]
-
Modeling the effects of clumpy winds in the high-energy light curves of gamma-ray binaries
Kefala, E. and Bosch-Ramon, V., arXiv e-prints parXiv:2210.16102 (2022) [LINK]
-
Relativistic fluid modelling of gamma-ray binaries. I. The model
Huber, D. et al., A&A 646 pA91 (2021) [LINK]
-
HAWC Search for High-Mass Microquasars
HAWC Collaboration et al., arXiv e-prints parXiv:2101.08945 (2021) [LINK]
-
NuSTAR observation of LS 5039
Volkov, Igor et al., arXiv e-prints parXiv:2103.04403 (2021) [LINK]
-
Relativistic fluid modelling of gamma-ray binaries. II. Application to LS 5039
Huber, David et al., arXiv e-prints parXiv:2103.00995 (2021) [LINK]
-
Explaining the extended GeV gamma-ray emission adjacent to HESS J1828-137
Collins, T. et al., arXiv e-prints parXiv:2104.05953 (2021) [LINK]
-
Phase-resolved hard X-ray emission of the high-mass binary LS 5039: a spectral hardening above 50 keV detected with INTEGRAL
Falanga, M. et al., arXiv e-prints parXiv:2104.07711 (2021) [LINK]
-
Radio absorption in high-mass gamma-ray binaries
Chen, A.M. et al., arXiv e-prints parXiv:2106.10445 (2021) [LINK]
-
Broad-Band High-Energy Emission of the Gamma-ray Binary System LS 5039: Spectral and Temporal Features using NuSTAR and Fermi Observations
Yoneda, Hiroki et al., arXiv e-prints parXiv:2106.13412 (2021) [LINK]
-
Polarization study of gamma-ray bianry
Hu, Xingxing and Takata, Jumpei, arXiv e-prints parXiv:2111.04300 (2021) [LINK]
-
Properties of a hypothetical cold pulsar wind in LS 5039
Bosch-Ramon, V., arXiv e-prints parXiv:2012.11578 (2020) [LINK]
-
Sign of hard X-ray pulsation from the gamma-ray binary system LS 5039
Yoneda, Hiroki et al., arXiv e-prints parXiv:2009.02075 (2020) [LINK]
-
A dynamical and radiation semi-analytical model of pulsar-star colliding winds along the orbit: Application to LS 5039
Molina, Edgar and Bosch-Ramon, Valent\'\i, arXiv e-prints parXiv:2007.00543 (2020) [LINK]
-
Gamma-ray binaries
Chernyakova, Maria and Malyshev, Denys, arXiv e-prints parXiv:2006.03615 (2020) [LINK]
-
VERITAS Detection of LS 5039 and HESS J1825-137
Abeysekara, A.U. et al., Astroparticle Physics 117 p102403 (2020) [LINK]
-
A diagnostic on the orbital spectrum of LS 5039 with Fermi-LAT
Chang, Zhi et al., arXiv e-prints parXiv:1907.07342 (2019) [LINK]
-
The H.E.S.S. Galactic plane survey
H.E.S.S. Collaboration et al., A&A 612 pA1 (2018) [LINK]
-
Uncovering the identities of compact objects in high-mass X-ray binaries and gamma-ray binaries by astrometric measurements
Yamaguchi, M.S. et al., ArXiv e-prints p (2017) [LINK]
-
The 2HWC HAWC Observatory Gamma-Ray Catalog
Abeysekara, A.U. et al., ApJ 843 p40 (2017) [LINK]
-
A First Look at Periodicity in HAWC with TeV Binaries
Brisbois, C. et al., ArXiv e-prints p (2017) [LINK]
-
Observations of Binary Systems with the H.E.S.S. Telescopes
Bordas, P. et al., ArXiv e-prints p (2016) [LINK]
-
Non-thermal emission from high-energy binaries through interferometric radio observations
Marcote, B., ArXiv e-prints p (2016) [LINK]
-
VHE observations of the gamma-ray binary system LS 5039 with H.E.S.S
Mariaud, C. et al., ArXiv e-prints p (2015) [LINK]
-
Modelling the high-energy emission from gamma-ray binaries using numerical relativistic hydrodynamics
Dubus, G. et al., ArXiv e-prints p (2015) [LINK]
-
Physical properties of the gamma-ray binary LS 5039 through low and high frequency radio observations
Marcote, B. et al., ArXiv e-prints p (2015) [LINK]
-
Gamma-ray binaries beyond one-zone models: an application to LS 5039
del Palacio, S. et al., ArXiv e-prints p (2014) [LINK]
-
Gamma-ray binaries and related systems
Dubus, G., ArXiv e-prints p (2013) [LINK]
-
Periodic radio morphology of gamma-ray binaries
Mold\'on, J. et al., ArXiv e-prints p (2013) [LINK]
-
Gamma-rays from nebulae around binary systems containing energetic rotation powered pulsars
Bednarek, W. and Sitarek, J., ArXiv e-prints p (2013) [LINK]
-
Periodic morphological changes in the radio structure of the gamma-ray binary LS 5039
Moldon, J. et al., A&A 548 pA103 (2012) [LINK]
-
Unraveling the high energy emission components of gamma-ray binaries
Zabalza, V. et al., ArXiv e-prints p (2012) [LINK]
-
Inverse Compton Scattering Model for X-ray Emission of the Gamma-ray Binary LS 5039
Yamaguchi, M.S. and Takahara, F., ArXiv e-prints p (2012) [LINK]
-
On the origin of LS 5039 and PSR J1825-1446
Moldon, J. et al., A&A 543 pA26 (2012) [LINK]
-
Long-term monitoring of the high-energy gamma-ray emission from LS I +61 303 and LS 5039
Hadasch, D. et al., ArXiv e-prints p (2012) [LINK]
-
A model for the two component gamma-ray spectra observed from the gamma-ray binaries
Bednarek, W., ArXiv e-prints p (2011) [LINK]
-
Mass and orbit constraints of the gamma-ray binary LS 5039
Szalai, T. et al., ArXiv e-prints p (2011) [LINK]
-
Direct Wind Accretion and Jet Launch in Binary Systems
Barkov, M.V. and Khangulyan, D.V., ArXiv e-prints p (2011) [LINK]
-
Results from the binaries LS I +61 303 and LS 5039 after 2.5 years of Fermi monitoring
Hadasch, D. and for the Fermi-LAT collaboration, ArXiv e-prints p (2011) [LINK]
-
Tracing colliding winds in the UV line orbital variability of gamma-ray binaries
Szostek, A. et al., ArXiv e-prints p (2011) [LINK]
-
Thermal X-ray Emission from the Shocked Stellar Wind of Pulsar Gamma-ray Binaries
Zabalza, V. et al., ArXiv e-prints p (2011) [LINK]
-
Monte-Carlo Simulations of Radio Emitting Secondaries in Gamma-Ray Binaries
Bosch-Ramon, V. and Khangulyan, D., ArXiv e-prints p (2011) [LINK]
-
Extended X-ray emission in the vicinity of the microquasar LS 5039: pulsar wind nebula?
Durant, M. et al., ArXiv e-prints p (2011) [LINK]
-
Gamma-ray binaries: microquasars and binary systems with pulsar
Paredes, J.M., ArXiv e-prints p (2011) [LINK]
-
The astrometric/morphological variability and the birth place of LS 5039
Moldon, J. et al., ArXiv e-prints p (2011) [LINK]
-
Relativistic Doppler-boosted emission in gamma-ray binaries
Dubus, G. et al., ArXiv e-prints p (2010) [LINK]
-
Gamma-ray binaries as non-accreting pulsar systems
Torres, D.F., ArXiv e-prints p (2010) [LINK]
-
Modulation Mechanism of Tev, Gev, and X-ray Emission in LS5039
Yamaguchi, M.S. and Takahara, F., ApJ 717 p85-92 (2010) [LINK]
-
Modeling the three-dimensional pair cascade in binaries. Application to LS 5039
Cerutti, B. et al., ArXiv e-prints p (2010) [LINK]
-
Looking into the heart of a beast: the black hole binary LS 5039
Szalai, T. et al., ArXiv e-prints p (2010) [LINK]
-
Microquasars in the GeV-TeV era
Paredes, J.M. and Zabalza, V., ArXiv e-prints p (2010) [LINK]
-
Fermi LAT Observations of LS 5039
The Fermi LAT collaboration, ArXiv e-prints p (2009) [LINK]
-
Exploring the powering source of the TeV X-ray binary LS 5039
Moldon, J. et al., p (2009) [LINK]
-
The Orbits of the Gamma-ray Binaries LS I +61 303 and LS 5039
Aragona, Christina and others, p (2009) [LINK]
-
Long-term Stability of Non-thermal X-ray Modulation in the Gamma-ray Binary LS 5039
Kishishita, T. et al., ArXiv e-prints p (2009) [LINK]
-
High-energy emission from jet-clump interactions in microquasars
Araudo, A.T. et al., ArXiv e-prints p (2009) [LINK]
-
Non-thermal emission from secondary pairs in close TeV binary systems
Bosch-Ramon, V. et al., ArXiv e-prints 801 p (2008) [LINK]
-
Studying the properties of the radio emitter in LS 5039
Bosch-Ramon, V., ArXiv e-prints p (2008) [LINK]
-
Pulsar wind model of close massive gamma-ray binaries: The influence of geometry in the pulsar wind zone processes
Sierpowska-Bartosik, A. and Torres, D.F., ArXiv e-prints 801 p (2008) [LINK]
-
Clues to unveil the emitter in LS 5039: powerful jets vs colliding winds
Bosch-Ramon, V. et al., ArXiv e-prints p (2008) [LINK]
-
The changing milliarcsecond radio morphology of the gamma-ray binary LS 5039
Ribo, M. et al., A&A 481 p (2008) [LINK]
-
On the X-ray/TeV connection in Galactic jet sources
Bosch-Ramon, V. et al., ArXiv e-prints 805 p (2008) [LINK]
-
The physics of non-thermal radiation in microquasars
Bosch-Ramon, V., ArXiv e-prints 805 p (2008) [LINK]
-
On the magnetic field and the TeV emitter location in Cygnus X-1 and LS 5039
Bosch-Ramon, V. et al., p (2008) [LINK]
-
The nature of LS 5039 under the scrutiny of gamma-rays
Torres, D.F. and Sierpowska-Bartosik, A., ArXiv e-prints p (2008) [LINK]
-
The accretion regime of LS 5039: 3-D SPH simulations
Okazaki, A. T. et al., ArXiv e-prints p (2008) [LINK]
-
INTEGRAL observation of hard X-ray variability of the TeV binary LS5039 / RX J1826.2-1450
Hoffmann, A.D. et al., ArXiv e-prints p (2008) [LINK]
-
The TeV emitter structure in LS 5039
Bosch-Ramon, V. et al., ArXiv e-prints p (2008) [LINK]
-
Spectral signature of a free pulsar wind in the gamma-ray binaries LS 5039 and LSI +61 303
Cerutti, B. et al., A&A 488 p37-46 (2008) [LINK]
-
The modulation of the gamma-ray emission from the binary LS 5039
Dubus, G. et al., A&A 477 p691-700 (2008) [LINK]
-
Study of the Spectral and Temporal Characteristics of X-Ray Emission of the Gamma-Ray Binary LS 5039 with Suzaku
Takahashi, T. et al., ArXiv e-prints p (2008) [LINK]
-
Pulsar model of the high energy phenomenology of LS 5039
Sierpowska-Bartosik, A. and Torres, D.F., ArXiv e-prints 708 p (2007) [LINK]
-
On the formation of TeV radiation in LS 5039
Khangulyan, D. et al., ArXiv e-prints 707 p (2007) [LINK]
-
Exploring the connection between the stellar wind and the non-thermal emission in LS 5039
Bosch-Ramon, V. et al., A&A 473 p545-550 (2007) [LINK]
-
INTEGRAL serendipitous detection of the gamma-ray microquasar LS 5039
Goldoni, P. et al., Ap&SS 309 p293-297 (2007) [LINK]
-
3.9 day orbital modulation in the TeV gamma-ray flux and spectrum from the X-ray binary LS 5039
Aharonian, F. et al., A&A 460 p743-749 (2006) [LINK]
-
Gamma-ray binaries: pulsars in disguise?
Dubus, G., A&A 456 p801-817 (2006) [LINK]
-
Discovery of Very High Energy Gamma Rays Associated with an X-ray Binary
Aharonian, F. et al., Science 309 p746-749 (2005) [LINK]
-
A possible black hole in the gamma-ray microquasar LS 5039
Casares, J. et al., MNRAS 364 p899-908 (2005) [LINK]
-
Orbital X-Ray Variability of the Microquasar LS 5039
Bosch-Ramon, V. et al., ApJ 628 p388-394 (2005) [LINK]
-
Optical polarimetric observations of the microquasar LS 5039
Combi, J.A. et al., A&A 427 p959-963 (2004) [LINK]
-
Long-term X-ray variability of the microquasar system LS 5039/RX J1826.2-1450.
Reig, P. et al., A&A 405 p285-290 (2003) [LINK]
-
Confirmation of persistent radio jets in the microquasar LS 5039
Paredes, J.M. et al., A&A 393 pL99-L102 (2002) [LINK]
-
LS 5039: A runaway microquasar ejected from the galactic plane
Ribo, M. et al., A&A 384 p954-964 (2002) [LINK]
-
X-ray and radio observations of RX J1826.2-1450/LS 5039
Ribo, M. et al., A&A 347 p518-523 (1999) [LINK]
-
The system LS 5039: a new massive radio emitting X-ray binary
Marti, J. et al., A&A 338 pL71-L74 (1998) [LINK]
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