J/ApJ/904/198 X-ray mass segregation effect in GCs. IV. (Cheng+, 2020)
Exploring the Mass Segregation Effect of X-Ray Sources in Globular Clusters.
IV. Evidence of Black Hole Burning in.
Cheng Z., Li Z., Wang W., Li X., Xu X.
<Astrophys. J., 904, 198 (2020)>
=2020ApJ...904..198C 2020ApJ...904..198C
ADC_Keywords: Clusters, globular; Black holes; Stars, double and multiple;
X-ray sources
Keywords: Globular star clusters ; Binary stars ; X-ray binary stars ;
Stellar mass black holes ; Gravitational wave sources ;
Stellar dynamics ; Intermediate-mass black holes
Abstract:
Using X-ray sources as sensitive probes of stellar dynamical
interactions in globular clusters (GCs), we study the mass segregation
and binary burning processes in ωCen. We show that the mass
segregation of X-ray sources is quenched in ωCen, while the
X-ray source abundance of ωCen is much smaller than other GCs,
and the binary hardness ratio (defined as LX/LKfb), with fb
being the binary fraction, LX and LK being the cumulative X-ray
and K-band luminosity of GCs, respectively) of ωCen is located
far below the LX/LKfb)--σc correlation line of the
dynamically normal GCs. This evidence suggests that the binary burning
processes are highly suppressed in ωCen, and other heating
mechanisms, very likely a black hole subsystem (BHS), are essential in
the dynamical evolution of ωCen. Through the black hole burning
processes (i.e., dynamical hardening of the BH binaries), the BHS is
dominating the energy production of ωCen, which also makes
ωCen a promising factory of gravitational-wave sources in the
Galaxy.
Description:
We used the Chandra Interactive Analysis Observations (CIAO, version
4.11) and the Chandra Calibration Database (version 4.8.4) to
reprocess the data. By setting the ObsID13726 as the reference frame,
we corrected the relative astrometry among the four observations, and
then merged them into master event files using the CIAO tool
mergeobs. Three groups of images have been created in soft
(0.5-2keV), hard (2-8keV), and full (0.5-8keV) bands and with a bin
size of 0.5, 1, and 2 pixels, respectively. These images are used for
detecting X-ray sources in this work.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 224 300 Main Chandra source catalog
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See also:
VII/195 : Globular Clusters in the Milky Way (Harris, 1996)
VII/202 : Globular Clusters in the Milky Way (Harris, 1997)
J/ApJ/697/224 : Chandra X-ray sources in ω Cen (Haggard+, 2009)
J/ApJ/710/1032 : Proper motions in ω Cen (Anderson+, 2010)
J/ApJ/827/12 : HSTPROMO cat. GCs. IV. Blue straggler stars (Baldwin+, 2016)
J/ApJ/842/6 : Astro-photometric cat. of the core of NGC5139 (Bellini+, 2017)
J/ApJ/844/164 : HST astro-photometric analysis NGC5139. III. (Bellini+, 2017)
J/MNRAS/478/1520 : Milky Way globular clusters data (Baumgardt+, 2018)
J/ApJ/853/86 : HST large programme on ω Centauri. II. (Bellini+, 2018)
J/MNRAS/479/2834 : 233 X-ray sources in omega Centauri (Henleywillis+, 2018)
J/MNRAS/482/5138 : Galactic GC mean proper motions & veloc. (Baumgardt+, 2019)
J/ApJ/883/90 : Mass segregation effect X-ray sources GCs. II. (Cheng+, 2019)
J/ApJ/876/59 : Chandra X-ray sources in globular cluster 47Tuc (Cheng+, 2019)
J/A+A/632/A3 : MUSE binaries in NGC 3201 (Giesers+, 2019)
J/MNRAS/484/2832 : Proper motions Milky Way globular clusters (Vasiliev, 2019)
J/ApJ/892/16 : X-ray mass segregation effect in GCs. III. M28 (Cheng+, 2020)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- XID X-ray catalog sequence number ([CLW2020] NN)
5- 22 A18 --- Name IAU designation (HHMMSS.ss+DDMMSS.s; J2000)
24- 33 F10.6 deg RAdeg [201/202] Right Ascension (J2000)
35- 44 F10.6 deg DEdeg [-47.7/-47.3] Declination (J2000)
46- 48 F3.1 arcsec PosErr [0/0.9] 1σ positional uncertainty
50- 54 F5.1 arcsec Dist [19.6/633] Projected distance from cluster
center (1)
56- 62 A7 --- PB Binomial no-source probability
64- 69 F6.1 ct Cnett [5.2/2706] Full (0.5-8keV) band
aperture-corrected source counts
71- 76 F6.1 ct e_Cnett [3.1/2654] 1σ lower bound of Cnett
78- 83 F6.1 ct E_Cnett [8.1/2759] 1σ upper bound of Cnett
85- 90 F6.1 ct Cnets [-1.9/1525] Soft (0.5-2keV) band
aperture-corrected source counts
92- 97 F6.1 ct e_Cnets [0/1486]? 1σ lower bound of Cnets
99-104 F6.1 ct E_Cnets [1/1564] 1σ upper bound of Cnets
106-111 F6.1 ct Cneth [-5/1200] Hard (2-8keV) band
aperture-corrected source counts
113-118 F6.1 ct e_Cneth [0/1165]? 1σ lower bound of Cneth
120-125 F6.1 ct E_Cneth [1/1235] 1σ upper bound of Cneth
127-134 E8.2 ph/cm2/s Fluxt [7.8e-08/5e-05] Full (0.5-8keV) band flux
136-144 E9.2 ph/cm2/s Fluxs [-2.6e-08/2.1e-05] Soft (0.5-8keV) band flux
146-154 E9.2 ph/cm2/s Fluxh [-1.2e-07/2.4e-05] Hard (0.5-8keV) band flux
156-163 E8.2 10-7W Lumtc [9.4e+29/7.9e+32] Absorption-corrected
intrinsic 0.5-8.0keV luminosity (2)
165-172 E8.2 10-7W Lumsc [2.8e+29/4e+32] Absorption-corrected
intrinsic 0.5-2.0keV luminosity
174-181 E8.2 10-7W Lumhc [6.6e+29/4.6e+32] Absorption-corrected
intrinsic 2.0-8.0keV luminosity
183-187 F5.2 [cm-2] NH [20.9/23]? Absorption column density, log
189-193 F5.2 [cm-2] e_NH [21/22.7]? 1σ lower bound of NH
195-199 F5.2 [cm-2] E_NH [21.3/23.2]? 1σ upper bound of NH
201-204 F4.2 --- PI [0.11/3.3]? Photon Index of powerlaw model
206-209 F4.2 --- e_PI [0.2/3]? 1σ lower bound of PI
211-214 F4.2 --- E_PI [1/3]? 1σ upper bound of PI
216-219 I4 --- DOF [1179/1182] Cstatistic degrees of freedom
221-224 I4 --- Cstat [321/1021] Cstatistic values (using 1192
PHA bins)
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Note (1): The cluster center coordinates adopted is RA=13:26:47.24 and
DEC=-47:28:46.45 (Anderson+, 2010, J/ApJ/710/1032)
Note (2): X-ray luminosities were derived from the model spectrum, assuming
a distance of 5.2kpc (Harris+, 1996, VII/195)
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History:
From electronic version of the journal
References:
Cheng et al. Paper I : 2019ApJ...876...59C 2019ApJ...876...59C Cat. J/ApJ/876/59
Cheng et al. Paper II : 2019ApJ...883...90C 2019ApJ...883...90C Cat. J/ApJ/883/90
Cheng et al. Paper III : 2020ApJ...892...16C 2020ApJ...892...16C Cat. J/ApJ/892/16
(End) Prepared by [AAS], Coralie Fix [CDS], 24-Mar-2022