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Discovery of the third transient x-ray binary in the galactic globular cluster Terzan 5

Discovery of the third transient x-ray binary in the galactic globular cluster Terzan 5
Discovery of the third transient x-ray binary in the galactic globular cluster Terzan 5
We report and study the outburst of a new transient X-ray binary (XRB) in Terzan 5, the third detected in this globular cluster, Swift J174805.3-244637 or Terzan 5 X-3. We find clear spectral hardening in Swift/XRT data during the outburst rise to the hard state, thanks to our early coverage (starting at LX ~ 4 × 1034 erg s–1) of the outburst. This hardening appears to be due to the decline in relative strength of a soft thermal component from the surface of the neutron star (NS) during the rise. We identify a Type I X-ray burst in Swift/XRT data with a long (16 s) decay time, indicative of hydrogen burning on the surface of the NS. We use Swift/BAT, MAXI/GSC, Chandra/ACIS, and Swift/XRT data to study the spectral changes during the outburst, identifying a clear hard-to-soft state transition. We use a Chandra/ACIS observation during outburst to identify the transient's position. Seven archival Chandra/ACIS observations show evidence for variations in Terzan 5 X-3's nonthermal component but not the thermal component during quiescence. The inferred long-term time-averaged mass accretion rate, from the quiescent thermal luminosity, suggests that if this outburst is typical and only slow cooling processes are active in the NS core, such outbursts should recur every ~10 yr.
0004-637X
1-15
Bahramian, Arash
390154f6-92b9-4e9f-9c5e-2eeaec97460a
Heinke, Craig O.
d7382ed2-cb85-4e15-b2d9-296fc8b6221d
Sivakoff, Gregory R.
e725b4eb-7437-46ca-9f6e-e56847938736
Altamirano, Diego
d5ccdb09-0b71-4303-9538-05b467be075b
Wijnands, Rudy
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Homan, Jeroen
67eb2764-46f0-455b-b1f0-f4824c129e87
Linares, Manuel
d501c137-c3eb-45ca-b05c-4d4040b42b7b
Pooley, David
72898f52-e7ed-441b-910c-95cd1e57db0d
Degenaar, Nathalie
347a2379-6b78-482e-976c-52f08a96114d
Gladstone, Jeanette C.
58d3f449-db12-480f-b411-7bd659a40d65
Bahramian, Arash
390154f6-92b9-4e9f-9c5e-2eeaec97460a
Heinke, Craig O.
d7382ed2-cb85-4e15-b2d9-296fc8b6221d
Sivakoff, Gregory R.
e725b4eb-7437-46ca-9f6e-e56847938736
Altamirano, Diego
d5ccdb09-0b71-4303-9538-05b467be075b
Wijnands, Rudy
4ac16ff6-b564-4e5d-89d4-36ff92c6030c
Homan, Jeroen
67eb2764-46f0-455b-b1f0-f4824c129e87
Linares, Manuel
d501c137-c3eb-45ca-b05c-4d4040b42b7b
Pooley, David
72898f52-e7ed-441b-910c-95cd1e57db0d
Degenaar, Nathalie
347a2379-6b78-482e-976c-52f08a96114d
Gladstone, Jeanette C.
58d3f449-db12-480f-b411-7bd659a40d65

Bahramian, Arash, Heinke, Craig O., Sivakoff, Gregory R., Altamirano, Diego, Wijnands, Rudy, Homan, Jeroen, Linares, Manuel, Pooley, David, Degenaar, Nathalie and Gladstone, Jeanette C. (2014) Discovery of the third transient x-ray binary in the galactic globular cluster Terzan 5. Astrophysical Journal, 780 (127), 1-15. (doi:10.1088/0004-637X/780/2/127).

Record type: Article

Abstract

We report and study the outburst of a new transient X-ray binary (XRB) in Terzan 5, the third detected in this globular cluster, Swift J174805.3-244637 or Terzan 5 X-3. We find clear spectral hardening in Swift/XRT data during the outburst rise to the hard state, thanks to our early coverage (starting at LX ~ 4 × 1034 erg s–1) of the outburst. This hardening appears to be due to the decline in relative strength of a soft thermal component from the surface of the neutron star (NS) during the rise. We identify a Type I X-ray burst in Swift/XRT data with a long (16 s) decay time, indicative of hydrogen burning on the surface of the NS. We use Swift/BAT, MAXI/GSC, Chandra/ACIS, and Swift/XRT data to study the spectral changes during the outburst, identifying a clear hard-to-soft state transition. We use a Chandra/ACIS observation during outburst to identify the transient's position. Seven archival Chandra/ACIS observations show evidence for variations in Terzan 5 X-3's nonthermal component but not the thermal component during quiescence. The inferred long-term time-averaged mass accretion rate, from the quiescent thermal luminosity, suggests that if this outburst is typical and only slow cooling processes are active in the NS core, such outbursts should recur every ~10 yr.

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Accepted/In Press date: 16 November 2013
e-pub ahead of print date: 17 December 2013
Published date: 10 January 2014
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 402031
URI: http://eprints.soton.ac.uk/id/eprint/402031
ISSN: 0004-637X
PURE UUID: 1c3719c9-8752-4129-9b08-83e88fa953af
ORCID for Diego Altamirano: ORCID iD orcid.org/0000-0002-3422-0074

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Date deposited: 27 Oct 2016 10:49
Last modified: 22 Nov 2021 03:06

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Contributors

Author: Arash Bahramian
Author: Craig O. Heinke
Author: Gregory R. Sivakoff
Author: Rudy Wijnands
Author: Jeroen Homan
Author: Manuel Linares
Author: David Pooley
Author: Nathalie Degenaar
Author: Jeanette C. Gladstone

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