Artículo de revista
A new, faint population of X-ray transients
Fecha
2017Registro en:
Monthly Notices of the Royal Astronomical Society, Volumen 467, Issue 4, 2017, Pages 4841-4857
13652966
00358711
10.1093/mnras/stx417
Autor
Bauer, Franz E.
Treister, Ezequiel
Schawinski, Kevin
Schulze, Steve
Luo, Bin
Alexander, David M.
Brandt, William N.
Comastri, Andrea
Forster, Francisco
Gilli, Roberto
Kann, David Alexander
Maeda, Keiichi
Nomoto, Ken'ichi
Paolillo, Maurizio
Ranalli, Piero
Schneider, Donald P.
Shemmer, Ohad
Tanaka, Masaomi
Tolstov, Alexey
Tominaga, Nozomu
Tozzi, Paolo
Vignali, Cristian
Wang, Junxian
Xue, Yongquan
Yang, Guang
Institución
Resumen
© 2017 The Authors. We report on the detection of a remarkable new fast high-energy transient found in the Chandra Deep Field-South, robustly associated with a faint (mR = 27.5mag, zph ~2.2) host in the CANDELS survey. The X-ray event is comprised of 115+12 -11 net 0.3-7.0 keV counts, with a light curve characterized by an ~100 s rise time, a peak 0.3-10 keV flux of ~5 × 10-12 erg s-1 cm-2 and a power-law decay time slope of -1.53 ± 0.27. The average spectral slope is Γ = 1.43+0.23 -0.13, with no clear spectral variations. The X-ray and multiwavelength properties effectively rule out the vast majority of previously observed highenergy transients. A few theoretical possibilities remain: an 'orphan' X-ray afterglow from an off-axis short-duration gamma-ray burst (GRB) with weak optical emission, a low-luminosity GRB at high redshift with no prompt emission below ~20 keV rest frame, or a highly beamed tidal disruption event (TDE) involving an intermediate-mass black hole and a white dwarf