J/ApJS/235/7 7yr MAXI/GSC X-ray source cat. (3MAXI), |b|<10° (Hori+, 2018)
The 7-year MAXI/GSC source catalog of the low-Galactic-latitude sky (3MAXI).
Hori T., Shidatsu M., Ueda Y., Kawamuro T., Morii M., Nakahira S.,
Isobe N., Kawai N., Mihara T., Matsuoka M., Morita T., Nakajima M.,
Negoro H., Oda S., Sakamoto T., Serino M., Sugizaki M., Tanimoto A.,
Tomida H., Tsuboi Y., Tsunemi H., Ueno S., Yamaoka K., Yamada S.,
Yoshida A., Iwakiri W., Kawakubo Y., Sugawara Y., Sugita S., Tachibana Y.,
Yoshii T.
<Astrophys. J. Suppl. Ser., 235, 7-7 (2018)>
=2018ApJS..235....7H 2018ApJS..235....7H (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, X-ray; Cross identifications; Active gal. nuclei;
Binaries, cataclysmic; Surveys; X-ray sources
Keywords: catalogs; surveys; X-rays: binaries
Abstract:
We present the first MAXI/GSC X-ray source catalog in the
low-Galactic-latitude sky |b|<10° outside the Galactic center
region (|b|<5°, l<30°, and l>330°) based on 7-year data
from 2009 August 13 to 2016 July 31. To overcome source confusion in
crowded regions, we have accurately calibrated the position-dependent
shape of the point-spread function of the MAXI/GSC by analyzing
onboard data. We have also taken into account the Galactic ridge X-ray
emission. Using a maximum likelihood image fitting method, we have
detected 221 sources with a significance threshold >6.5σ, 7 of
which are transients only detected in 73-day time-sliced images. The
faintest source has a flux of 5.2x10-12erg/cm2/s (or an intensity
of 0.43mCrab) in the 4-10keV band. We have identified the counterparts
for about 81% of the detected sources, by cross-matching with the
Swift, Uhuru, RXTE, XMM-Newton, MCXC, and ROSAT all-sky survey
catalogs. Our catalog contains the source name, position and its
error, flux and detection significance in the 3-4keV, 4-10keV, and
10-20keV bands, hardness ratios, and information on the likely
counterpart for the individual detected sources. We have obtained
73-day bin light curves of all the cataloged sources over 7 years and
have calculated their periodograms. On the basis of the mean
properties of time variability and spectral hardness, we suggest that
the majority of the unidentified sources are low-mass X-ray binaries
or blazars. Finally, we present the log N-log S relations at different
Galactic longitudes and for different source populations.
Description:
We used the Monitor of All-sky X-ray Image/Gas Slit Camera (MAXI/GSC)
cleaned event data version 1.8 from 2009-August-13 to 2016-July-31,
and reduced them with essentially the same method as that in the
MAXI/GSC 37-month high-latitude catalog (Hiroi+ 2013, J/ApJS/207/36).
In Table 4, we provide the 7-year MAXI/GSC catalog in the Galactic
plane region |b|<10° (except for the Galactic center region
|b|<5° and |l|<30°), obtained from the GSC data in the 4-10keV
band. We detected 214 sources in total, with a significance of
sD,4-10keV=6.5 in the 7-year integrated image, 143 of which are
identified with sources listed in BAT105 (Oh+ 2018, J/ApJS/235/4).
Seven sources are additionally detected in the 73-day (i.e., 0.2yr)
time-sliced images ("73-day sources"; Table 5), one of which is
identified with BAT105 (Oh+ 2018, J/ApJS/235/4).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 130 214 Properties of the 7-year sources in the
MAXI/GSC catalog at |b|<10°
table5.dat 129 7 Properties of the 73-day sources in the
MAXI/GSC catalog at |b|<10°;
see Section 3.4
table6.dat 84 214 Possible counterparts for the 7-year sources
in the MAXI/GSC catalog at |b|<10°
table7.dat 84 7 Possible counterparts for te 73-day sources in
the MAXI/GSC catalog at |b|<10°
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See also:
IX/4 : Fourth UHURU Catalogue (4U) (Forman+ 1978)
VII/80 : The HEAO A-1 X-Ray Source Catalog (Wood+, 1984)
IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
J/ApJS/134/77 : ASCA Gal. Plane Survey faint X-ray sources (Sugizak+, 2001)
J/A+A/411/L59 : INTEGRAL reference catalog (Ebisawa+, 2003)
J/A+A/418/927 : RXTE All-Sky Slew Survey cat., |b|>10° (Revnivtsev+, 2004)
J/MNRAS/351/31 : XMM-Newton Galactic Plane Survey (XGPS) (Hands+, 2004)
J/ApJ/635/214 : Chandra X-ray sources and NIR identifications (Ebisawa+, 2005)
J/ApJS/170/175 : Third IBIS/ISGRI soft gamma-ray survey catalog (Bird+, 2007)
J/A+A/480/611 : XMM-Newton Slew Survey catalogue, XMMSL1 (Saxton+, 2008)
J/ApJS/186/1 : The 4th IBIS/ISGRI soft gamma-ray survey catalog (Bird+, 2010)
J/A+A/534/A109 : MCXC Meta-Catalogue X-ray galaxy Clusters (Piffaretti+, 2011)
J/PASJ/63/S677 : MAXI/GSC catalog in high Galactic-latitude sky (Hiroi+, 2011)
J/A+A/553/A12 : XMM-Newton SSC survey of Gal. Plane (Nebot Gomez-Moran+, 2013)
J/ApJS/207/19 : Hard X-ray survey from Swift-BAT 6yrs (Baumgartner+, 2013)
J/ApJS/207/36 : 2nd MAXI/GSC cat. in high galactic-latitude sky (Hiroi+, 2013)
J/ApJS/223/15 : 8yr INTEGRAL/IBIS soft gamma-ray source obs. (Bird+, 2016)
J/other/NewA/47.81 : Distances of X-ray binaries (Islam+, 2016)
J/ApJS/235/4 : The 105-month Swift-BAT all-sky hard X-ray survey (Oh+, 2018)
Byte-by-byte Description of file: table[45].dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/221] Running sequence number
(nos 1-214 for the 7-year sources and
nos 215-221 for the 73-day sources)
5- 13 A9 --- 3MAXI 3MAXI identifier (JHHMM+DDMM)
15- 21 F7.3 deg RAdeg Right ascension (J2000)
23- 29 F7.3 deg DEdeg [-70/68] Declination (J2000)
31- 35 F5.3 deg ePos [0.016/0.22]? The 1σ statistical
position error
37- 42 F6.1 --- sig4-10 [6/2272] Significance in the 4-10keV band
44- 50 F7.1 10-12mW/m2 F4-10keV [5/13859] The observed 4-10keV flux in
units of 10-12erg/cm2/s (1)
52- 55 F4.1 10-12mW/m2 e_F4-10keV [0.7/12] F4-10keV uncertainty
57- 62 F6.1 --- sig3-4 [0/1508] Significance in the 3-4keV band
64 A1 --- l_F3-4keV Limit flag on F3-4keV
66- 71 F6.1 10-12mW/m2 F3-4keV [0.2/3980] The observed 3-4keV flux
in units of 10-12erg/cm2/s (2)
73- 75 F3.1 10-12mW/m2 e_F3-4keV [0.2/4]? F3-4keV uncertainty
77- 81 F5.1 --- sig10-20 [0/998] Significance in the 10-20keV band
83 A1 --- l_F10-20keV Limit flag on F10-20keV
85- 90 F6.1 10-12mW/m2 F10-20keV [1.7/8510] The observed 10-20keV flux
in units of 10-12erg/cm2/s (3)
92- 95 F4.1 10-12mW/m2 e_F10-20keV [2.6/35]? F10-20keV uncertainty
97-101 F5.2 --- HR1 [-0.9/1] HR(3-4keV, 4-10keV) calculated
with Equation-2 (4)
103-106 F4.2 --- e_HR1 [0/0.2] HR1 uncertainty
108-112 F5.2 --- HR2 [-1/0.7] HR(4-10keV, 10-20keV)
calculated with Equation-2 (4)
114-117 F4.2 --- e_HR2 [0/0.5] HR2 uncertainty
119-124 F6.3 --- rms [-0.23/18.7] Excess variance
(σ2_rms) calculated
with Equation-3
126-130 F5.3 --- e_rms [0/0.4] rms uncertainty
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Note (1): Converted from Crab units by assuming a Crab-like spectrum;
1mCrab=1.21x10-11erg/cm2/s
Note (2): Converted from Crab units by assuming a Crab-like spectrum;
1mCrab=3.98x10-12erg/cm2/s
Note (3): Converted from Crab units by assuming a Crab-like spectrum;
1mCrab=8.51x10-12erg/cm2/s
Note (4): HRs were defined by the fluxes in any two of the three bands:
Equation (2): HR(H,S)=(FH-FS)/(FH+FS)
where FH and FS correspond to the fluxes in the higher and
lower energy bands, respectively.
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Byte-by-byte Description of file: table[67].dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq [1/221] Running sequence number
(nos 215-221 for the 73-day sources)
5- 13 A9 --- 3MAXI 3MAXI identifier (JHHMM+DDMM)
15- 40 A26 --- CName Possible counterpart name
42- 48 F7.3 deg RACdeg ? Right ascension (J2000)
50- 56 F7.3 deg DECdeg [-70/68]? Declination (J2000)
58- 62 F5.3 deg Sep [0.01/0.6]? Angular separation between the MAXI
position and that of possible a counterpart
64- 77 A14 --- OType Object type (1)
79- 82 A4 --- Flag Cross-matching flag (2)
84 A1 --- Note Note (3)
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Note (1): Abbreviations in object type:
Sy = Seyfert galaxy,
AGN = active galactic nucleus,
HMXB = high-mass X-ray binary,
LMXB = low-mass X-ray binary,
XRB = X-ray binary,
SNR = supernova remnant,
CV = cataclysmic variable,
unID = unidentified source
Note (2): B, U, X, N, M, and R indicate that the source has one or more
counterparts in the BAT105 (Oh+ 2018, J/ApJS/235/4), 4U (the Uhuru
fourth catalog (Forman+ 1978, IX/4), XTEASMLONG (the RXTE All-Sky
Monitor (ASM) long-term observed source table:
http://heasarc.gsfc.nasa.gov/W3Browse/xte/xteasmlong.html),
XMMSL2 (Saxton+ 2008, J/A+A/480/611 and IX/53),
MCXC (Piffaretti+ 2011, J/A+A/534/A109), and 1RXS (IX/10),
respectively. The counterpart name listed in column "CName" is quoted
from the catalog expressed by the leftmost letter in this column.
Note (3): Note as follows:
T = Transient or new MAXI source.
S = Classified as an XRB in the original catalog (BAT105;
Oh+ 2018, J/ApJS/235/4).
C = Classified as a symbiotic star in the original catalog (BAT105;
Oh+ 2018, J/ApJS/235/4).
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 12-Oct-2023