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J/PASJ/57/135       Chandra observation of NGC 2146              (Inui+, 2005)

Chandra observation of the starburst galaxy NGC 2146. Inui T., Matsumoto H., Tsuru T.G., Koyama K., Matsushita S., Peck A.B., Tarchi A. <Publ. Astron. Soc. Jap., 57, 135-145 (2005)> =2005PASJ...57..135I
ADC_Keywords: Active gal. nuclei ; X-ray sources Keywords: galaxies: active - galaxies: individual (NGC 2146) - galaxies: starburst - X-rays: galaxies Abstract: We present six monitoring observations of the starburst galaxy NGC 2146 using the Chandra X-ray Observatory. We detected 67 point sources in the field of view of the ACIS-S detector. Six of these sources were Ultra-Luminous X-ray Sources, the brightest of which had a luminosity of 5x1039erg/s. One of them, with a luminosity of ∼1x1039erg/s, is coincident with the dynamical center location, which may be a low-luminosity active galactic nucleus. We have produced a table where the positions and main characteristics of the detected sources are reported. A comparison between the positions of the X-ray sources and those detected in NIR or radio indicates no definite counterpart. We have derived a logN-logS relation and a luminosity function. The luminosity function has a slope of 0.71 above a detection limit, which is similar to those found in other starburst galaxies. Diffuse emissions were detected in both soft (0.5-2.0keV) and hard (2.0-10.0keV) energy bands. The spectra of the diffuse component were fitted with two (hard and soft) components. The hard power-law component, with a luminosity of ∼4x1039erg/s, is likely to have originated by unresolved point sources. Description: NGC 2146 was observed six times through 2002 August to December, with the Advanced CCD Imaging Spectrometer on board the Chandra X-ray Observatory (CXO). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table8.dat 118 67 Main Chandra Point Source Catalog
See also: B/chandra : The Chandra Archive Log (CXC, 1999-) J/ApJS/157/59 : Ultraluminous X-ray sources in nearby galaxies (Liu+, 2005) Byte-by-byte Description of file: table8.dat
Bytes Format Units Label Explanations
1- 2 I2 --- [IMT2005] Sequential number 4- 5 I2 h RAh Right ascension (J2000) 7- 8 I2 min RAm Right ascension (J2000) 10- 14 F5.2 s RAs Right ascension (J2000) 16 A1 --- DE- Declination sing (J2000) 17- 18 I2 deg DEd Declination (J2000) 20- 21 I2 arcmin DEm Declination (J2000) 23- 26 F4.1 arcsec DEs Declination (J2000) 28- 32 F5.1 ct NCt Net photon counts with background substracted 34- 37 F4.1 ct e_NCt rms uncertainty on NCt 39- 42 F4.1 --- Signi Significance 44- 47 F4.2 --- VTime Time variability given with the chi2 test 49- 53 F5.2 --- HR ? Hardness ratio (H-S)/(H+S) (H:2-10keV, S:0.5-2keV) 54 A1 --- n_HR [c] Note on HR (1) 55- 59 F5.2 --- HRl ?=- Lower limit of hardness ratio interval (90% confidence) 61- 65 F5.2 --- HRu ?=- Upper limit of hardness ratio interval (90% confidence) 67- 70 F4.2 10-22cm-2 NH ? Absorption column density 71 A1 --- n_NH [b] Note on NH (1) 72- 75 F4.2 10-22cm-2 NHl ?=- Lower limit of NH interval (90% confidence) 77- 80 F4.2 10-22cm-2 NHu ?=- Upper limit of NH interval (90% confidence) 82- 85 F4.2 --- Gamma ? Photon-index 86 A1 --- n_Gamma [a] Note on Gamma (1) 87- 90 F4.2 --- Gammal ?=- Lower limit of Gamma interval (90% confidence) 92- 95 F4.2 --- Gammau ?=- Upper limit of Gamma interval (90% confidence) 97-100 F4.2 10-17W/m2 Fhard Observed flux in the hard 2-10keV band 102-106 F5.2 10-17W/m2 Ftot Observed flux in the total 0.5-10keV band 108-112 F5.2 [10-7W] logLhard X-ray luminosity in the hard 2-10keV band 114-118 F5.2 [10-7W] logLtot X-ray luminosity in the total 0.5-10keV band
Note (1): Notes as follows: a = Photon index fixed at 2.0 due to low number of counts (<180cts) b = Absorption column density fixed at 0.4 (1022cm-2), the best-fit value of the diffuse emission (<120cts). c = Since a background-substracted hard band counts drop into minus, HR shows less than -1.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 27-Jun-2006
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

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