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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2023

eRASSt J040515.6-745202, an X-ray burster in the Magellanic Bridge

F. Haberl
  • Fonction : Auteur
C. Maitra
  • Fonction : Auteur
F. Valdes
  • Fonction : Auteur
D. Lang
  • Fonction : Auteur
V. Doroshenko
  • Fonction : Auteur
L. Ducci
  • Fonction : Auteur
I. Kreykenbohm
  • Fonction : Auteur
A. Rau
  • Fonction : Auteur
P. Weber
  • Fonction : Auteur
J. Wilms
  • Fonction : Auteur
C.D. Bailyn
  • Fonction : Auteur
G.K. Jaisawal
  • Fonction : Auteur
P.S. Ray
  • Fonction : Auteur
H. Treiber
  • Fonction : Auteur

Résumé

During the third all-sky survey (eRASS3), eROSITA, the soft X-ray instrument aboard Spectrum-Roentgen-Gamma, detected a new hard X-ray transient, eRASSt J040515.6-745202, in the direction of the Magellanic Bridge. We arranged follow-up observations and searched for archival data to reveal the nature of the transient. Using X-ray observations with XMM-Newton, NICER, and Swift, we investigated the temporal and spectral behaviour of the source for over about 10 days. The X-ray light curve obtained from the XMM-Newton observation with an 28 ks exposure revealed a type-I X-ray burst with a peak bolometric luminosity of at least 1.4e37 erg/s. The burst energetics are consistent with a location of the burster at the distance of the Magellanic Bridge. The relatively long exponential decay time of the burst of 70 s indicates that it ignited in a H-rich environment. The non-detection of the source during the other eROSITA surveys, twelve and six months before and six months after eRASS3, suggests that the burst was discovered during a moderate outburst which reached 2.6e36 erg/s in persistent emission. During the NICER observations, the source showed alternating flux states with the high level at a similar brightness as during the XMM-Newton observation. This behaviour is likely caused by dips as also seen during the last hour of the XMM-Newton observation. Evidence for a recurrence of the dips with a period of 21.8 hr suggests eRASSt J040515.6-745202 is a low-mass X-ray binary (LMXB) system with an accretion disk seen nearly edge on. We identify a multi-wavelength counterpart to the X-ray source in UVW1 and g, r, i, and z images obtained by the optical/UV monitor on XMM-Newton and the Dark Energy Camera at the Cerro Tololo Inter-American Observatory. (abbreviated)
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hal-03879315 , version 1 (15-10-2023)

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F. Haberl, G. Vasilopoulos, C. Maitra, F. Valdes, D. Lang, et al.. eRASSt J040515.6-745202, an X-ray burster in the Magellanic Bridge. Astronomy and Astrophysics - A&A, 2023, 669, pp.A66. ⟨10.1051/0004-6361/202245015⟩. ⟨hal-03879315⟩
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