2011ATel.3662....1K

Query : 2011ATel.3662....1K

2011ATel.3662....1K - The Astronomer's Telegram, 3662, 1 (2011/September-0)

Swift detects MAXI J1543-564 transition into hard state.

KENNEA J.A., MOTTA S., CURRAN P., EVANS P.A., KRIMM H.A., ROMANO P., MANGANO V., YAMAOKA K. and NEGORO H.

Abstract (from CDS):

Swift/XRT has been performing regular monitoring observations of the black-hole candidate binary system MAXI J1543-564 (Negoro et al., ATEL #3330) since May 8th, 2010 (Kennea et al., ATEL #3331). The source was seen to go into the soft state, where the spectrum is dominated by thermal emission from the disk, around May 15th, 2011 (e.g. Kennea et al., ATEL #3362, Munoz-Darias et al., ATEL #3355).

The source remained in the soft state, and flux has been slowly dropping, with the spectrum characterized by a disk blackbody model that has been cooling (from ∼1 keV to ∼0.6 keV), with the absorption corrected 0.5-10 keV flux decreasing from peak of ∼1.6 x 10<sup>-9</sup> erg/s/cm<sup>2</sup> on May 15th, 2011 to the current value of ∼9 x 10<sup>-11</sup> erg/s/cm<sup>-2</sup> measured on Sept 26th, 2011. The most recent observations have shown that from September 23rd, 2011 the hardness ratio (4-10 keV count rate/ 0.5-4 keV count rate) has started to increase, signaling that the source is returning to the hard state.

Examining the combined spectra of an observations taken by Swift/XRT of MAXI J1543-564 taken on September 25th-26th, 2011, we find that the spectrum is well fit by an absorbed power-law model with the following parameters:

N<sub>H</sub> = 1.4 ± 0.13 x 10<sup>22</sup> cm<sup-2</sup>

Photon Index = 2.69 (+0.13/-0.13)

Flux (0.5-10 keV) = 8.3 ± 0.2 x 10<sup>-11</sup> erg/s/cm<sup>-2</sup>

Although a disk component is not required to fit the spectrum, if we add this component to the fit, in the 0.5-10 keV range the disk fraction is ∼ 5%. By the standard definition (e.g. Remillard and McClintock, 2006), this is consistent with MAXI J1543-564 transitioning into the hard state (disk fraction < 20%).

MAXI J1543-564 also appears to be increasing in brightness in the BAT 15-50 keV band. The rate on Sep. 26, 2011 is 0.0027 =/- 0.0015 ct/s/cm<sup>2</sup> (∼12 mCrab). The source had been undetectable in the BAT since approximately July 12, 2011.

Monitoring of this source by Swift is continuing.

BAT Transient Monitor light curve of MAXI J1543-564: http://swift.gsfc.nasa.gov/docs/swift/results/transients/weak/MAXIJ1543-564


Abstract Copyright: ∼

Journal keyword(s): Transient

Errata: + erratum vol. 3664, p. 1

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 MAXI J1543-564 XB* 15 43 17.3567740392 -56 24 49.118899500           ~ 56 0

Query : 2011ATel.3662....1K

Basic data :
MAXI J1543-564 -- X-ray Binary
Other object types: otypes_help 		X (MAXI,[OKM2018]), XB* (2013ApJS), HX? (2016ApJS), * (Gaia), BH? (2011PASJ)
ICRS coord. (ep=J2000) : 		15 43 17.3567740392 -56 24 49.118899500 (Optical) [ 0.3208 0.3276 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		15 39 21.0909775886 -56 15 18.566560887 [ 0.3208 0.3276 90 ]
Gal coord. (ep=J2000) : 		325.0852614528250 -01.1213346185423 [ 0.3208 0.3276 90 ]
Proper motions mas/yr : 		-4.432 -4.337 [0.550 0.522 90] A 2020yCat.1350....0G
Fluxes (1) :
G 20.002352 [0.005663] C 2020yCat.1350....0G
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Identifiers (3) :
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MAXI J1543-564 [OKM2018] SWIFT J1543.4-5624 Gaia DR3 5884240474106548736

References (56 between 1850 and 2026) (Total 56)
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Gaia DR3 5884240474106548736

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