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NGC5866CXO - NGC 5866 Chandra X-Ray Point Source Catalog

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Overview

S0 galaxies are often thought to be passively evolved from spirals after star formation is quenched. To explore what is actually occurring in such galaxies, the authors conducted a multi-wavelength case study of NGC 5866 - a nearby edge-on S0 galaxy in a relatively isolated environment. This study shows strong evidence for dynamic activities in the interstellar medium, which are most likely driven by supernova explosions in the galactic disk and bulge. Understanding these activities can have strong implications for studying the evolution of such galaxies. The authors utilized Chandra, Hubble Space Telescope, and Spitzer data as well as ground-based observations to characterize the content, structure, and physical state of the medium and its interplay with the stellar component in NGC 5866. These reveal the presence of diffuse X-ray-emitting hot gas, which extends as far as 3.5 kpc away from the galactic plane and can be heated easily by Type Ia SNe in the bulge.

The Chandra/ACIS observation of NGC 5866 was taken on 2002 November 14. The authors reprocessed the archived data for their study. See Figure 1 in the reference paper for the Chandra/ACIS-S image of NGC 5866 in the 0.3-7 keV band. This table contains the detected X-ray point sources listed in table 2 of this paper.


Catalog Bibcode

2009ApJ...706..693L

References

Dynamic S0 galaxies: a case study of NGC 5866.
    Li J.-T., Wang Q.D., Li Z., Chen Y.
   <Astrophys. J., 706, 693-704 (2009)>
   =2009ApJ...706..693L

Provenance

This table was created by the HEASARC in May 2018 based on CDS Catalog J/ApJ/706/693 file table2.dat, the list of detected X-ray sources in the Chandra observation of NGC 5866.

Parameters

Source_Number
A unique sequential identification number for each X-ray source in the catalog, sorted in order of increasing J2000.0 Right Ascension.

Name
The name of the Chandra source using the "CXOU" prefix (for Chandra X-ray Observatory Unregistered source) and the J2000.0 coordinates of the source in the "JHHMMSS.ss+DDMMSS.s" format.

RA
The Right Ascension of the Chandra X-ray source in the selected equinox. This parameter was derived by the HEASARC from the CXOU source name and thus is precise only to 0.01 seconds of time (and truncated).

Dec
The Declination of the Chandra X-ray source in the selected equinox. This parameter was derived by the HEASARC from the CXOU source name and thus is precise only to 0.1 arcseconds (and truncated).

LII
The Galactic Longitude of the Chandra X-ray source.

BII
The Galactic Latitude of the Chandra X-ray source.

Error_Radius
The 1-sigma positional uncertainty of the X-ray source, in arcseconds. This is calculated from the maximum likelihood centroiding error and an approximate off-axis angle (r) dependent systematic error, namely 0.2" + 1.4"*(r/8')2 (an approximation to Fig. 4 of Feigelson et al. 2002, ApJ, 574, 258), which are added in quadrature.

Count_Rate
The on-axis exposure-corrected count rate of the X-ray source in the entire (broad-band) 0.3-7 keV energy range, in ct/s (converted by the HEASARC from the ct/ks units used in the original table). This is the sum of the exposure-corrected count rates in the four individual bands (0.3-0.7 keV (S1), 0.7-1.5 keV (S2), 1.5-3 keV (H1), and 3-7 keV (H2)) that were used in this study.

Count_Rate_Error
The uncertainty in the on-axis exposure-corrected count rate of the X-ray source in the entire (broad-band) 0.3-7 keV energy range, in ct/s (converted by the HEASARC from the ct/ks units used in the original table).

Hardness_Ratio
The hardness ratio HR of the Chandra source, Defined as HR = (H-S2)/(H+S2), where S1 = 0.3-0.7 keV, S2 = 0.7-1.5 keV, H = 1.5-7 keV, S = 0.3-1.5 keV. This is listed only for values with uncertainties less than 0.2.

Hardness_Ratio_Error
The uncertainty in the hardness ratio HR of the Chandra source.

Hardness_Ratio_1
The hardness ratio HR1 of the Chandra source, Defined as HR1 = (S2-S1)/S, where S1 = 0.3-0.7 keV, S2 = 0.7-1.5 keV, H = 1.5-7 keV, S = 0.3-1.5 keV. This is listed only for values with uncertainties less than 0.2.

Hardness_Ratio_1_Error
The uncertainty in the hardness ratio HR1 of the Chandra source.

Detect_Flags
This parameter contains labels that mark the bands in which a source is detected with the most accuracy and that were used to derive the quoted source position, as follows:

        S = soft band (0.3-1.5 keV)
        H = hard band (1.5-7.0 keV)
        B = broad band (0.3-7.0 keV)
  

Contact Person

Questions regarding the NGC5866CXO database table can be addressed to the HEASARC User Hotline.
Page Author: Browse Software Development Team
Last Modified: Tuesday, 22-May-2018 15:31:19 EDT