J/ApJ/602/231 Chandra X-ray point sources in nearby galaxies (Colbert+, 2004)
Old and young X-ray point source populations in nearby galaxies.
Colbert E.J.M., Heckman T.M., Ptak A.F., Strickland D.K., Weaver K.A.
<Astrophys. J., 602, 231-248 (2004)>
=2004ApJ...602..231C 2004ApJ...602..231C
ADC_Keywords: Galaxies, nearby ; X-ray sources ; Binaries, X-ray
Keywords: X-rays: binaries - X-rays: galaxies
Abstract:
We have analyzed Chandra ACIS observations of 32 nearby spiral and
elliptical galaxies and present the results of 1441 X-ray point
sources that were detected in these galaxies. The total point-source
X-ray (0.3-8.0keV) luminosity LXP is well correlated with the
B-band, K-band, and FIR+UV luminosities of spiral host galaxies and is
well correlated with the B-band and K-band luminosities of elliptical
galaxies. This suggests an intimate connection between LXP and both
the old and young stellar populations, for which K and FIR+UV
luminosities are reasonable proxies for the galaxy mass M and star
formation rate SFR.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 65 32 Observational Data
table2.dat 74 32 Galaxy Properties
tablea1.dat 98 1441 Properties of the X-ray Point Sources
--------------------------------------------------------------------------------
See also:
B/chandra : The Chandra Archive Log (CXC, 2002)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Name Galaxy name
12- 20 A9 --- OName Other name
21- 24 I4 --- ObsID Chandra observation ID
27 I1 --- CCD1 ACIS CCD number in galaxy field of view for
which point sources were detected.
28 A1 --- --- [/]
29 I1 --- CCD2 ? ACIS CCD number in galaxy field of view for
which point sources were detected.
30 A1 --- --- [/]
31 I1 --- CCD3 ? ACIS CCD number in galaxy field of view for
which point sources were detected.
32 A1 --- --- [/]
33 I1 --- CCD4 ? ACIS CCD number in galaxy field of view for
which point sources were detected.
34 A1 --- --- [/]
35 I1 --- CCD5 ? ACIS CCD number in galaxy field of view for
which point sources were detected.
37- 40 F4.1 ks ExpTime1 Exposure time for CCD1
41 A1 --- --- [/]
42- 45 F4.1 ks ExpTime2 ? Exposure time for CCD2
46 A1 --- --- [/]
47- 50 F4.1 ks ExpTime3 ? Exposure time for CCD3
51 A1 --- --- [/]
52- 55 F4.1 ks ExpTime4 ? Exposure time for CCD4
56 A1 --- --- [/]
57- 60 F4.1 ks ExpTime5 ? Exposure time for CCD5
63- 65 I3 --- NX-ray Number of X-ray point sources detected within
galaxy field of view
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Name Galaxy name
12- 15 F4.1 Mpc Dist Distance
17- 30 A14 --- MType Morphological type
31- 39 A9 --- AGN AGN type
41- 44 F4.1 [10-7W] logLB B-band luminosity
46- 49 F4.1 [10-7W] logLK K-band luminosity
51 A1 --- l_logLFIR Limit flag on logLFIR
52- 55 F4.1 [10-7W] logLFIR Far-IR luminosity
57- 60 F4.1 [10-7W] logLUV UV luminosity
62 A1 --- l_LFIR/LB Limit flag on LFIR/LB
63- 68 F6.4 --- LFIR/LB FIR to B band luminosity ratio
70 A1 --- l_LFIR+UV/LK Limit flag on LFIR+UV/LK
71- 74 F4.2 --- LFIR+UV/LK FIR+UV to B-band luminosity ratio
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Name Host Galaxy NGC number (see Table 1)
12- 13 I2 h RAh Hour of Right Ascension (J2000)
15- 16 I2 min RAm Minute of Right Ascension (J2000)
18- 21 F4.1 s RAs Second of Right Ascension (J2000)
23 A1 --- DE- Sign of the Declination (J2000)
24- 25 I2 deg DEd Degree of Declination (J2000)
27- 28 I2 arcmin DEm Arcminute of Declination (J2000)
30- 31 I2 arcsec DEs Arcsecond of Declination (J2000)
33 I1 --- CCD ACIS CCD number (1)
35- 39 F5.2 [10-7W] LX Log of the 0.3-8 keV X-ray luminosity
in units of erg/s (2)
41- 46 F6.1 ct ct(H) Net observed counts in the Hard band (3)
48- 51 F4.1 ct e_ct(H) ? Uncertainty in HR(H)
53- 58 F6.1 ct ct(M) Net observed counts in the Medium band (4)
60- 63 F4.1 ct e_ct(M) ? Uncertainty in HR(M)
65- 70 F6.1 ct ct(S) Net observed counts in the Soft band (5)
72- 75 F4.1 ct e_ct(S) ? Uncertainty in HR(S)
77- 81 F5.1 --- HR(HM) ? The (H-M)/(H+M) hardness ratio (6)
83- 86 F4.2 --- e_HR(HM) ? Uncertainty in HR(HM)
88- 92 F5.1 --- HR(MS) ? The (M-S)/(M+S) hardness ratio (6)
94- 97 F4.2 --- e_HR(MS) ? Uncertainty in HR(MS)
--------------------------------------------------------------------------------
Note (1): CCDs 5 and 7 are back-illuminated, and the others are
front-illuminated (see section 3.1).
Note (2): Assuming galaxy distances listed in Table 2 and exposure times listed
in Table 1. See section 3.1 for details about assumed spectrum.
Note (3): Hard = 2.0-8.0keV.
Note (4): Medium = 1.0-2.0keV.
Note (5): Soft = 0.3-1.0keV.
Note (6): Uncorrected (see section 3.1).
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 06-Apr-2004