J/ApJ/685/958 Spitzer and Chandra sources in galactic center (Arendt+ 2008)
Comparison of 3.6-8.0 µm Spitzer/IRAC Galactic Center survey point sources with Chandra X-ray point sources in the central 40x40 parsecs. Arendt R.G., Gezari D.Y., Stolovy S.R., Sellgren K., Smith R., Ramirez S.V., Yusef-Zadeh F., Law C.J., Smith H.A., Cotera A.S., Moseley S.H. <Astrophys. J., 685, 958-970 (2008)> =2008ApJ...685..958A
ADC_Keywords: Infrared sources ; Photometry, infrared ; X-ray sources Keywords: Galaxy: center - infrared: stars - X-rays: binaries Abstract: We have studied the correlation between 2357 Chandra X-ray point sources in a 40x40pc field and ∼20000 infrared sources we observed in the corresponding subset of our 2x1.4° Spitzer/IRAC Galactic Center Survey at 3.6-8.0um, using various spatial and X-ray hardness thresholds. The correlation was determined for source separations of less than 0.5", 1", or 2". Only the soft X-ray sources show any correlation with infrared point sources on these scales, and that correlation is very weak. The upper limit on hard X-ray sources that have infrared counterparts is <1.7% (3σ). However, because of the confusion limit of the IR catalog, we only detect IR sources with absolute magnitudes ≲1. As a result, a stronger correlation with fainter sources cannot be ruled out. Only one compact IR source, IRS 13, coincides with any of the dozen prominent X-ray emission features in the 3x3pc region centered on Sgr A*, and the diffuse X-ray and IR emission around Sgr A* seems to be anticorrelated on a few-arcsecond scale. We compare our results with previous identifications of near-infrared companions to Chandra X-ray sources. Description: Spitzer/IRAC Galactic Center survey observations cover four broad bands at 3.6, 4.5, 5.8, and 8um with a nominal resolution of ∼2". We calculated the correlation between 2357 hard and soft Chandra X-ray sources cataloged by Muno et al. (2003, Cat. J/ApJ/589/225) and the corresponding ∼20000 Spitzer/IRAC IR point sources. The IR sources are a small subset of our full catalog (Ramirez et al. 2008, Cat. II/295). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table7.dat 110 115 *IR and X-ray sources coinciding within 1" (no physical association implied)
Note on table7.dat: Positional coincidence does not necessarily imply a physical association of IR and X-ray sources. In fact, ∼70% of the objects on this list are likely to be random positional coincidences of unrelated sources along the line of sight.
See also: B/chandra : The Chandra Archive Log (CXC, 1999-) II/293 : GLIMPSE Source Catalog (I + II + 3D) (IPAC 2008) II/295 : Spitzer IRAC survey of the galactic center (Ramirez+, 2008) J/ApJ/589/225 : Chandra X-ray sources toward Galactic Center (Feigelson+, 2003) J/ApJ/613/1179 : X-ray sources in Galactic Center (Muno+, 2004) J/ApJS/181/110 : Galactic center x-ray sources (Muno+, 2009) Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 5 A5 --- --- [SSTGC] 7- 13 I7 --- SSTGC IR source identification number (1) 15- 23 F9.5 deg RAdeg IR right ascension in decimal degree (J2000) 25- 33 F9.5 deg DEdeg IR declination in decimal degree (J2000) 35- 39 F5.2 mag [3.6] ? Spitzer/IRAC 3.6um band magnitude 41- 45 F5.2 mag [4.5] ? Spitzer/IRAC 4.5um band magnitude 47- 51 F5.2 mag [5.8] ? Spitzer/IRAC 5.8um band magnitude 53- 57 F5.2 mag [8.0] ? Spitzer/IRAC 8.0um band magnitude 59- 63 A5 --- --- [CXOGC] 65- 80 A16 --- CXOGC X-ray source identification (JHHMMSS.s+DDMMSS) (2) 82- 90 F9.5 deg RAXdeg X-ray right ascension in decimal degree (J2000) 92-100 F9.5 deg DEXdeg X-ray declination in decimal degree (J2000) 102-105 A4 --- Sp Spectrum (soft for detected in the 0.5-2.0keV band or hard for not detected in this band) 107-110 F4.2 arcsec Sep Separation between IR and X-ray source positions
Note (1): Ramirez et al., 2008, Cat. II/295. <SSTGC NNNNNNN> in Simbad. Note (2): Muno et al., 2003, Cat. J/ApJ/589/225. <CXOGC JHHMMSS.s-DDMMSS> in Simbad.
History: From electronic version of the journal
(End) Emmanuelle Perret [CDS] 14-Dec-2010
|The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line|