J/ApJ/589/225 Chandra X-ray sources toward Galactic Center (Muno+, 2003)
A deep Chandra catalog of X-ray point sources toward the Galactic Center.
Muno M.P., Baganoff F.K., Bautz M.W., Brandt W.N., Broos P.S.,
Feigelson E.D., Garmire G.P., Morris M.R., Ricker G.R., Townsley L.K.
<Astrophys. J. 589, 225 (2003)>
=2003ApJ...589..225M 2003ApJ...589..225M
ADC_Keywords: X-ray sources
Keywords: catalogs - Galaxy: center - X-rays: general
Abstract:
We present a catalog of 2357 point sources detected during 590ks of
Chandra observations of the 17x17' field around Sgr A*. This field
encompasses a physical area of 40x40pc at a distance of 8kpc. The
completeness limit of the sample at the Galactic center is 1031erg/s
(2.0-8.0keV), while the detection limit is an order of magnitude
lower. The 281 sources detected below 1.5keV are mainly in the
foreground of the Galactic center, while comparisons to the Chandra
deep fields at high Galactic latitudes suggest that only about 100 of
the observed sources are background AGNs.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 279 2357 Brightest point sources in the 17x17' field
toward the Galactic center
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See also:
J/A+A/368/835 : Soft X-ray sources in Galactic Center region (Sidoli+, 2001)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [CXOGC]
6- 21 A16 --- CXOGC The IAU designation
23- 31 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000)
33- 41 F9.5 deg DEdeg Declination in decimal degrees (J2000)
43- 46 F4.1 arcmin Sep Offset from Sgr A*
48- 52 F5.1 ks Exp Live time on source
54- 57 F4.2 --- FPSF Fraction of PSF encompassed by
source region
59- 62 F4.1 keV EPSF Energy at which PSF was estimated
64- 67 I4 ct Sct Total counts (0.5-2.0keV) in source region
69- 73 F5.1 ct Sbckg Estimated background (0.5-2.0keV) in
source region
75- 79 F5.1 --- Sbsc Ratio of areas of bkg and src regions,
0.5-2.0keV (1)
81- 85 F5.1 cm2 SARF Mean value of effective area function,
ARF (0.5-2.0keV)
87- 90 I4 ct M1ct Total counts (2.0-3.3keV) in source region
92- 96 F5.1 ct M1bckg Estimated background (2.0-3.3keV) in
source region
98-102 F5.1 --- M1bsc Ratio of areas of bkg and src regions,
(2.0-3.3keV) (1)
104-108 F5.1 cm2 M1ARF Mean value of effective area function,
ARF (2.0-3.3keV)
110-113 I4 ct M2ct Total counts (3.3-4.7keV) in source region
115-119 F5.1 ct M2bckg Estimated background (3.3-4.7keV) in
source region
121-125 F5.1 --- M2bsc Ratio of areas of bkg and src regions,
(3.3-4.7keV) (1)
127-131 F5.1 cm2 M2ARF Mean value of effective area function,
ARF (3.3-4.7keV)
133-136 I4 ct Hct Total counts (4.7-8.0keV) in source region
138-142 F5.1 ct Hbckg Estimated background (4.7-8.0keV) in
source region
144-148 F5.1 --- Hbsc Ratio of areas of bkg and src regions,
(4.7-8.0keV) (1)
150-154 F5.1 cm2 HARF Mean value of effective area function,
ARF (4.7-8.0keV)
156-159 I4 ct Fct Net counts in the full band F=0.5-8.0keV
161 A1 --- leFct Limit flag on e_Fct
162-163 I2 ct e_Fct Uncertainty or upper limit on Fct
165-170 F6.3 --- HR0 ?=-9.00 Soft hardness ratio, M1-S/M1+S (2)
172-177 F6.3 --- e_HR0 ?=-9.000 Lower uncertainty on HR0 (3)
179-184 F6.3 --- E_HR0 ?=-9.000 Upper uncertainty on HR0 (4)
186-191 F6.3 --- HR1 ?=-9. Medium hardness ratioM2-M1/M2+M1 (2)
193-198 F6.3 --- e_HR1 ?=-9.000 Lower uncertainty on HR1 (3)
200-205 F6.3 --- E_HR1 ?=-9.000 Upper uncertainty on HR1 (4)
207-212 F6.3 --- HR2 ?=-9.00 Hard hardness ratio, H-M2/H+M2 (2)
214-219 F6.3 --- e_HR2 ?=-9.000 Lower uncertainty on HR2 (3)
221-226 F6.3 --- E_HR2 ?=-9.000 Upper uncertainty on HR2 (4)
228-233 F6.2 10-7ph/cm2/s SFlux Photon flux (S=0.5-2.0keV)
235 A1 --- l_SFlux Limit flag on e_SFlux
236-239 F4.2 10-7ph/cm2/s e_SFlux Uncertainty or upper limit on SFlux
241-246 F6.2 10-7ph/cm2/s M1Flux Photon flux (M1=2.0-3.3keV)
248 A1 --- leM1Flux Limit flag on e_M1Flux
249-252 F4.2 10-7ph/cm2/s e_M1Flux Uncertainty or upper limit on M1Flux
254-259 F6.2 10-7ph/cm2/s M2Flux Photon flux (M2=3.3-4.7keV)
261 A1 --- leM2Flux Limit flag on e_M2Flux
262-265 F4.2 10-7ph/cm2/s e_M2Flux Uncertainty or upper limit on M2Flux
267-272 F6.2 10-7ph/cm2/s HFlux Photon flux (H=4.7-8.0keV)
274 A1 --- leHFlux Limit flag on e_HFlux
275-279 F5.2 10-7ph/cm2/s e_HFlux Uncertainty or upper limit on HFlux
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Note (1): The scaling factor to convert counts in the background region
into counts in the source region is BSc=Sum[Bi]/Sum[Bi*ASi/ABi],
where i is the observation number, Bi are the background counts in
background region i, ABi is the area of background region i, and ASi
is the area of the source region i. With this definition, the total
counts from all of the background regions (Sum[Bi]) can be divided by
BSc to yield the total background in the source region for all of the
observations, BK = Sum[Bi*ASi/ABi]. The uncertainty on the estimated
background can be computed from, e.g. {Sqrt(Sum[Bi]+0.75)+ 1}/BSc, for
the 1-sigma upper limit from Gerhels (1986ApJ...303..336G 1986ApJ...303..336G).
Note (2): Colors are defined according to (h-s)/(h+s), where h and s
are the net counts in high and low energy bands, respectively.
For the soft color, h is in the 2.0-3.3keV band (M1),
and s is in the 0.5-2.0keV bans (S)
For the medium color, h is in the 3.3-4.7keV band (M2),
and l is in the 2.0-3.3keV band (M1).
For the hard color, h is 4.7-8.0keV band (H)
and s is 3.3-4.7keV band (M2).
Values are set to -9.000 if the 90% confidence interval of
both bands contain zero counts.
Note (3): -9.000 = if the harder band is consistent with zero.
Note (4): -9.000 = if the softer band is consistent with zero.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 26-Sep-2003