The optical counterpart of the bright x-ray transient swift j1745-26

T. Muñoz-Darias; A. De Ugarte Postigo; D. M. Russell; S. Guziy; J. Gorosabel; J. Casares; M. Armas Padilla; P. A. Charles; R. P. Fender; T. M. Belloni; F. Lewis; S. Motta; A. Castro-Tirado; C. G. Mundell; R. Sánchez-Ramírez; C. C. Thöne

doi:10.1093/mnras/stt532

The optical counterpart of the bright x-ray transient swift j1745-26

T. Muñoz-Darias, A. De Ugarte Postigo, D. M. Russell, S. Guziy, J. Gorosabel, J. Casares, M. Armas Padilla, P. A. Charles, R. P. Fender, T. M. Belloni, F. Lewis, S. Motta, A. Castro-Tirado, C. G. Mundell, R. Sánchez-Ramírez, C. C. Thöne

Department of Physics

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15 Citations (SciVal)

Abstract

We present a 30-day monitoring campaign of the optical counterpart of the bright X-ray transient Swift J1745-26, starting only 19min after the discovery of the source.We observe the system peaking at i~17.6 on day six (MJD 561 92) to then decay at a rate of ~0.04 mag d^-1. We show that the optical peak occurs at least 3 d later than the hard X-ray (15-50 keV) flux peak. Our measurements result in an outburst amplitude greater than 4.3 mag, which favours an orbital period ≲21 h and a companion star with a spectral type later than ~A0. Spectroscopic observations taken with the Gran Telescopio de Canarias 10.4 m telescope reveal a broad (full width at half-maximum ~1100 km s^-1), double-peaked Ha emission line from which we constrain the radial velocity semi-amplitude of the donor to be K₂ > 250 km s^-1. The breadth of the line and the observed optical and X-ray fluxes suggest that Swift J1745-26 is a new black hole candidate located closer than ~7 kpc.

Original language	English
Pages (from-to)	1133-1137
Number of pages	5
Journal	Monthly Notices of the Royal Astronomical Society
Volume	432
Issue number	2
DOIs	https://doi.org/10.1093/mnras/stt532
Publication status	Published - 21 Jun 2013

Keywords

Accretion
Accretion discs
X-rays:binaries

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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Muñoz-Darias, T., De Ugarte Postigo, A., Russell, D. M., Guziy, S., Gorosabel, J., Casares, J., Armas Padilla, M., Charles, P. A., Fender, R. P., Belloni, T. M., Lewis, F., Motta, S., Castro-Tirado, A., Mundell, C. G., Sánchez-Ramírez, R., & Thöne, C. C. (2013). The optical counterpart of the bright x-ray transient swift j1745-26. Monthly Notices of the Royal Astronomical Society, 432(2), 1133-1137. https://doi.org/10.1093/mnras/stt532

Muñoz-Darias, T, De Ugarte Postigo, A, Russell, DM, Guziy, S, Gorosabel, J, Casares, J, Armas Padilla, M, Charles, PA, Fender, RP, Belloni, TM, Lewis, F, Motta, S, Castro-Tirado, A, Mundell, CG, Sánchez-Ramírez, R & Thöne, CC 2013, 'The optical counterpart of the bright x-ray transient swift j1745-26', Monthly Notices of the Royal Astronomical Society, vol. 432, no. 2, pp. 1133-1137. https://doi.org/10.1093/mnras/stt532

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abstract = "We present a 30-day monitoring campaign of the optical counterpart of the bright X-ray transient Swift J1745-26, starting only 19min after the discovery of the source.We observe the system peaking at i~17.6 on day six (MJD 561 92) to then decay at a rate of ~0.04 mag d-1. We show that the optical peak occurs at least 3 d later than the hard X-ray (15-50 keV) flux peak. Our measurements result in an outburst amplitude greater than 4.3 mag, which favours an orbital period ≲21 h and a companion star with a spectral type later than ~A0. Spectroscopic observations taken with the Gran Telescopio de Canarias 10.4 m telescope reveal a broad (full width at half-maximum ~1100 km s-1), double-peaked Ha emission line from which we constrain the radial velocity semi-amplitude of the donor to be K2 > 250 km s-1. The breadth of the line and the observed optical and X-ray fluxes suggest that Swift J1745-26 is a new black hole candidate located closer than ~7 kpc.",

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AU - Muñoz-Darias, T.

AU - De Ugarte Postigo, A.

AU - Russell, D. M.

AU - Guziy, S.

AU - Gorosabel, J.

AU - Casares, J.

AU - Armas Padilla, M.

AU - Charles, P. A.

AU - Fender, R. P.

AU - Belloni, T. M.

AU - Lewis, F.

AU - Motta, S.

AU - Castro-Tirado, A.

AU - Mundell, C. G.

AU - Sánchez-Ramírez, R.

AU - Thöne, C. C.

PY - 2013/6/21

Y1 - 2013/6/21

N2 - We present a 30-day monitoring campaign of the optical counterpart of the bright X-ray transient Swift J1745-26, starting only 19min after the discovery of the source.We observe the system peaking at i~17.6 on day six (MJD 561 92) to then decay at a rate of ~0.04 mag d-1. We show that the optical peak occurs at least 3 d later than the hard X-ray (15-50 keV) flux peak. Our measurements result in an outburst amplitude greater than 4.3 mag, which favours an orbital period ≲21 h and a companion star with a spectral type later than ~A0. Spectroscopic observations taken with the Gran Telescopio de Canarias 10.4 m telescope reveal a broad (full width at half-maximum ~1100 km s-1), double-peaked Ha emission line from which we constrain the radial velocity semi-amplitude of the donor to be K2 > 250 km s-1. The breadth of the line and the observed optical and X-ray fluxes suggest that Swift J1745-26 is a new black hole candidate located closer than ~7 kpc.

AB - We present a 30-day monitoring campaign of the optical counterpart of the bright X-ray transient Swift J1745-26, starting only 19min after the discovery of the source.We observe the system peaking at i~17.6 on day six (MJD 561 92) to then decay at a rate of ~0.04 mag d-1. We show that the optical peak occurs at least 3 d later than the hard X-ray (15-50 keV) flux peak. Our measurements result in an outburst amplitude greater than 4.3 mag, which favours an orbital period ≲21 h and a companion star with a spectral type later than ~A0. Spectroscopic observations taken with the Gran Telescopio de Canarias 10.4 m telescope reveal a broad (full width at half-maximum ~1100 km s-1), double-peaked Ha emission line from which we constrain the radial velocity semi-amplitude of the donor to be K2 > 250 km s-1. The breadth of the line and the observed optical and X-ray fluxes suggest that Swift J1745-26 is a new black hole candidate located closer than ~7 kpc.

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The optical counterpart of the bright x-ray transient swift j1745-26

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