Access to Astronomical Catalogues

← Click to display the menu
J/A+A/480/397   XMM observations of NGC 2808 and NGC 4372   (Servillat+, 2008)

XMM-Newton observations of the Galactic globular clusters NGC 2808 and NGC 4372. Servillat M., Webb N.A., Barret D. <Astron. Astrophys., 480, 397-407 (2008)> =2008A&A...480..397S
ADC_Keywords: Clusters, globular ; X-ray sources Keywords: Galaxy: globular clusters: individual: NGC 2808 - Galaxy: globular clusters: individual: NGC 4372 - X-rays: general - stars: binaries: close Abstract: Galactic globular clusters harbour binary systems that are detected as faint X-ray sources. These close binaries are thought to play an important role in the stability of the clusters by liberating energy and delaying the inevitable core collapse of globular clusters. The inventory of close binaries and their identification is therefore essential. We present XMM-Newton observations of two Galactic globular clusters: NGC 2808 and NGC 4372. We use X-ray spectral and variability analysis combined with ultra-violet observations made with the XMM-Newton optical monitor and published data from the Hubble Space Telescope to identify sources associated with the clusters. We compare the results of our observations with estimates from population synthesis models. Description: NGC 2808 was observed on February 1st 2005, for 41.8 kiloseconds (ks) with the three European Photon Imaging Cameras (EPIC MOS1, MOS2 and pn) on board the XMM-Newton observatory, in imaging mode, using a full frame window and a medium filter. The observation of NGC 4372 was performed under the same conditions on March 23-24th 2005, for 29.7ks, but the MOS1 CCD6 was inoperative (micro-meteorite event on March 9th 2005), and the pn data was lost due to technical issues. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 66 96 NGC 2808 X-ray source properties table3.dat 66 10 NGC 4372 X-ray source properties
See also: B/xmm : XMM-Newton Observation Log (XMM-Newton SOC, 2007) J/A+A/309/116 : 10 globular cluster ROSAT observations (Johnston+, 1996) Byte-by-byte Description of file: table2.dat table3.dat
Bytes Format Units Label Explanations
1- 2 A2 --- [SWB2008] Sequential number (1) 4- 5 I2 h RAh X-ray Right ascension (J2000) 7- 8 I2 min RAm X-ray Right ascension (J2000) 10- 14 F5.2 s RAs X-ray Right ascension (J2000) 16 A1 --- DE- X-ray Declination sign (J2000) 17- 18 I2 deg DEd X-ray Declination (J2000) 20- 21 I2 arcmin DEm X-ray Declination (J2000) /bin/bash: q: command not found 29- 32 F4.2 arcsec e_Pos Positional error 34- 38 F5.1 ct/ks CR Count rate 40- 43 F4.1 ct/ks e_CR rms uncertainty on CR 45- 49 F5.1 10-17W/m2 Flux Flux converted with ECFs in band 0.5-10keV 51- 54 F4.1 10-17W/m2 e_Flux rms uncertainty on Flux 56- 60 F5.2 --- HR1 Hardness ratio 1 (2) 62- 66 F5.2 --- HR2 Hardness ratio 2 (2)
Note (1): Nomenclature note: Objects identified as [SWB2008] NGC 2808 NN or [SWB2008] NGC 2808 CN in table2 [SWB2008] NGC 4372 NN in table3 Note (2): Hardness ratio as HR=(B2-B1)/(B1+B2), HR1 for 0.5-1.5 and 1.5-3keV energy bands, HR2 for 1.5-3 and 3-10keV energy bands.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 26-May-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

catalogue service

© UDS/CNRS

Contact