XTE J1906+090: a persistent low luminosity Be X-ray Binary

Abstract

We present new results from INTEGRAL and Swift observations of the hitherto poorly studied and unidentified X-ray source XTE J1906+090. A bright hard X-ray outburst (luminosity of $\sim$10${}^{36}$ erg s${}^{-1}$ above 20 keV) has been discovered with INTEGRAL observations in 2010, this being the fourth outburst ever detected from the source. Such events are sporadic, the source duty cycle is in the range (0.8--1.6)% as inferred from extensive INTEGRAL and Swift monitoring in a similar hard X-ray band. Using five archival unpublished Swift/XRT observations, we found that XTE J1906+090 has been consistently detected at a persistent low X-ray luminosity value of $\sim$10${}^{34}$ erg s${}^{-1}$, with limited variability (a factor as high as 4). Based on our findings, we propose that XTE J1906+090 belongs to the small and rare group of persistent low luminosity Be X-ray Binaries.

arXiv commentAccepted for publication in MNRAS. 7 pages, 6 figures, 5 tables

References in corpus (23)

• On the Absorption of X-rays in the Interstellar Medium
• The Swift X-ray Telescope
• Atomic Data for Astrophysics. II. New Analytic Fits for Photoionization Cross Sections of Atoms and Ions
• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• ISGRI: the INTEGRAL Soft Gamma-Ray Imager
• The INTEGRAL Science Data Centre (ISDC)
• The 4th IBIS/ISGRI soft gamma-ray survey catalog
• A New Class of High-Mass X-ray Binaries: Implications for Core Collapse and Neutron-Star Recoil
• High-Mass X-ray binaries in the Small Magellanic Cloud
• Discovery of two new persistent Be/X-ray pulsar systems
• The IBIS soft gamma-ray sky after 1000 INTEGRAL orbits
• IGR J18483-0311: an accreting X-ray pulsar observed by INTEGRAL
• The X-ray properties of Be/X-ray pulsars in quiescence
• XMM-Newton observation of the Be/neutron star system RX J0146.9+6121: a soft X-ray excess in a low luminosity accreting pulsar
• XMM-Newton observation of the persistent Be/neutron-star system X Persei at a high-luminosity level
• XMM-Newton observation of the persistent Be/NS X-ray binary pulsar RX J1037.5-5647 in a low luminosity state
• XMM-Newton observation of the persistent Be/NS X-ray binary pulsar RX J0440.9+4431
• Discovering a 5.72 Day Period in the Supergiant Fast X-ray Transient AX J1845.0-0433
• Discovery of a New 89 Second X-ray Pulsar XTE J1906+09
• Diverse Long-Term Variability of Five Candidate High-Mass X-ray Binaries from Swift Burst Alert Telescope Observations
• Serendipitous Detections of XTE J1906+09 with the Rossi X-ray Timing Explorer
• Swift monitoring of the massive X-ray binary SAX J0635.2+0533
• A deep $XMM-Newton$ observation of the X-Persei-like binary system CXOU J225355.1+624336

Cited by in corpus (2)

• The role of XMM-Newton in the investigation of persistent BeXRBs
• True Unicorns and False Positives: Simulated Probabilities of Dark Massive Companions to Bright Stars