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J/AJ/132/1372       Chandra observation of NGC 6822          (Tennant+, 2006)

Chandra observation of NGC 6822. Tennant A.F. <Astron. J., 132, 1372-1383 (2006)> =2006AJ....132.1372T
ADC_Keywords: Galaxies, nearby ; X-ray sources Keywords: galaxies: individual (NGC 6822) - methods: data analysis - X-rays: galaxies Abstract: Chandra observed the nearby dwarf galaxy NGC 6822. There are 70 sources in the Chandra field, two of which are fairly extended and likely background clusters of galaxies. A third source was resolved by Chandra that has the same size and position as a known supernova remnant. The suspected variability detected from this source in previous missions is shown to be in error. The majority of the remaining 67 sources are consistent with background sources. Of the 61 sources detected above a completeness limit of 10 events, we estimate that 9±4±8 are associated with the galaxy, including both systematic and statistical errors. We compare the X-ray positions of all sources with various catalogs and Hubble Space Telescope data and offer tentative identifications for several. Based on the mass and star formation rate of NGC 6822, we expect only about 10 sources, mostly high-mass systems. Description: NGC 6822 was observed for 28.1ks by Chandra on 2002 November 4. The I-array CCDs plus S2 were operated in the normal 3.14s time exposure mode. The S2 chip was mostly used as a background monitor, and since it was far off-axis did not yield any other useful information about NGC 6822. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 41 68 Chandra Sources in NGC 6822
See also: J/AJ/121/2020 : CTIO and WFPC2 photometry in NGC 6822 (Bianchi+, 2001) J/AJ/132/378 : HST and UV photometry of NGC 6822 (Bianchi+, 2006) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 A3 --- [T2006] Source name (SNN) 5- 6 I2 h RAh Right ascension (J2000) 8- 9 I2 min RAm Right ascension (J2000) 11- 16 F6.3 s RAs Right ascension (J2000) 18 A1 --- DE- Declination sign (J2000) 19- 20 I2 deg DEd Declination (J2000) 22- 23 I2 arcmin DEm Declination (J2000) 25- 29 F5.2 arcsec DEs Declination (J2000) 31- 33 F3.1 arcsec ePos Radius hat encloses the Chandra position with 90% confidence 35- 37 F3.1 arcsec PSFsig Size of the PSF at this location 39- 41 I3 ct Counts Number of counts detected corrected for the PSF
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 25-Apr-2008
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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