UltraCompCAT A Catalogue of Ultra-Compact and Short Orbital Period X-ray Binaries

« Previous object   Next object »

ID# 7

47 Tuc X-9

47 Tuc W42, 47 Tuc V1, 1E 0021.8-7221

Confirmed UCXB

RA                 Dec     [hh:mm:ss.ss]          [dd:mm:ss.ss] 00:24:04.25  -72:04:58.02                      [ICRS]

ℓ                      b [deg]                            [deg] 305.897030  -44.887576

Year of discovery: 1981

(Grindlay1981)

Basic data

Location in Globular Cluster	47 Tuc/NGC 104
Type of accretor	--	Persistent
Distance [kpc] (other distances) Gaia [kpc]	4.521 ±0.031 4.45±0.12	Baumgardt2021 Bogdanov2016Watkins2015 Chen2018
z [kpc]	-3.18	Baumgardt2021
Orbital period (Porb) [min]	28.18±0.02	Bahramian2017
Porb determination method	X-ray modulation
Thermonuclear X-ray burst
Peak X-ray flux [erg s-1 cm-2] (2 - 10 keV)	4.73E-12	Bahramian2017
NH [x1022 cm-2]	0.013	Heinke2005
E(B-V) [mag]	0.04±0.02	Harris2010Salaris2007
Magnitude	U=19.4	Paresce1992
Proposed companion	hydrogen-poor/CO WD (X-ray spec Opt Spec)	Bahramian2017 Tudor2018

NOTES

Bahramian2017 claimed a 6.8 day periodicity, which, if real, must have a super-orbital origin. This modulations was recovered in optical data (Tudor2018). A radio counterpart was first reported by Miller-Jones2015 at 5.5 and 9 GHz. Measurements from simultaneous radio and X-ray observations performed in February 2015 place the source within the scatter of the black hole population, but closer to the transitional MSPs in the LR-LX plane.

Spectral data

UV	double-peaked C IV λ1550 emission lines	Knigge2008
Optical	Featureless	Tudor2018
X-ray	O VIII emission line (0.65 keV) O VII (0.57 keV) emission line, bump at ~0.3 keV (C ?)	Heinke2005 Bahramian2017

Peak Optical/NIR magnitudes

If the system is transient, quiescent magnitudes are indicated with a "q" superindex Knigge2008 Paresce1992 Edmonds2003
m_FUV=17.53 (STMAG), m_F336W=19.11 (STMAG), U=19.4, F300W=18.10, F555W=19.81

Aladin finding chart

Scroll to zoom. Set survey image in "Manage layers"
Default image: DSS2 Red

47 Tuc X-9 in Simbad

---

References to finding charts

Grindlay2001Heinke2005Bhattacharya2017Knigge2008Miller-Jones2015