J/MNRAS/370/25 XMM observations of NGC 55 (Stobbart+, 2006)
The X-ray properties of the dwarf Magellanic-type galaxy NGC 55.
Stobbart A.-M., Roberts T.P., Warwick R.S.
<Mon. Not. R. Astron. Soc., 370, 25-42 (2006)>
=2006MNRAS.370...25S 2006MNRAS.370...25S
ADC_Keywords: Galaxies, nearby ; X-ray sources
Keywords: galaxies: individual: NGC 55 - galaxies: Magellanic Clouds -
X-rays: binaries - X-rays: galaxies
Abstract:
We present an analysis of the X-ray properties of the Magellanic-type
galaxy NGC 55 based on two contiguous XMM-Newton observations. We
detect a total of 137 X-ray sources in the field of view, down to a
flux of ∼5x10-15erg/cm2/s (0.3-6keV), 42 of which are located
within the optical confines of the galaxy. On the basis of X-ray
colour classification and after correcting for background objects, we
conclude that our source sample includes ∼20 X-ray binaries (XRBs),
five supernova remnants and seven very soft sources (including two
good candidate supersoft sources) associated with NGC 55. We also
detect an X-ray source coincident with a previously identified
globular cluster in NGC 55.
Description:
Two observations of NGC 55 were carried out by XMM-Newton in the period
2001 November 1415, with the second observation commencing 2.2ks
after the termination of the first.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 139 137 Catalogue of sources detected in the
XMM-Newton observations
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [SRW2006] Sequential number
4 A1 --- n_[SRW2006] [*] *: objects within the D25 ellipse
6- 7 I2 h RAh Right ascension (J2000)
9- 10 I2 min RAm Right ascension (J2000)
12- 16 F5.2 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- 28 F4.1 arcsec DEs Declination (J2000)
30- 33 F4.2 arcsec e_Pos 1sigma error radius including a 0.5-arcsec
systematic error
35 A1 --- f_PNcrs [*] *: significant detection (>4sigma)
36- 40 F5.1 ct/ks PNcrs ?=- PN soft (0.3-1keV) count rate
42- 44 F3.1 ct/ks e_PNcrs ?=- rms uncertainty on PNcrs
46 A1 --- f_PNcrm [*] *: significant detection (>4sigma)
47- 51 F5.1 ct/ks PNcrm ?=- PN medium (1-2keV) count rate
53- 55 F3.1 ct/ks e_PNcrm ?=- rms uncertainty on PNcrm
57 A1 --- f_PNcrh [*] *: significant detection (>4sigma)
58- 62 F5.1 ct/ks PNcrh ?=- PN hard (2-6keV) count rate
64- 66 F3.1 ct/ks e_PNcrh ?=- rms uncertainty on PNcrh
68 A1 --- f_MOScrs [*] *: significant detection (>4sigma)
69- 73 F5.1 ct/ks MOScrs ?=- MOS soft (0.3-1keV) count rate
75- 77 F3.1 ct/ks e_MOScrs ?=- rms uncertainty on MOScrs
79 A1 --- f_MOScrm [*] *: significant detection (>4sigma)
80- 84 F5.1 ct/ks MOScrm ?=- MOS medium (1-2keV) count rate
86- 88 F3.1 ct/ks e_MOScrm ?=- rms uncertainty on MOScrm
90 A1 --- f_MOScrh [*] *: significant detection (>4sigma)
91- 94 F4.1 ct/ks MOScrh ?=- MOS hard (2-6keV) count rate
96- 98 F3.1 ct/ks e_MOScrh ?=- rms uncertainty on MOScrh
100-104 F5.2 --- HR1 ?=- Soft hardness ratio 1, HR1=(M-S)/(M+S)
106-109 F4.2 --- e_HR1 ?=- rms uncertainty on HR1
111-115 F5.2 --- HR2 ?=- Hard hardness ratio 2, HR2=(H-M)/(H+M)
117-120 F4.2 --- e_HR2 ?=- rms uncertainty on HR2
122-127 F6.2 10-17W/m2 FX X-ray flux in (0.3-6keV) band
129-132 F4.2 10-17W/m2 e_FX rms uncertainty on FX
134-139 F6.2 10+29W LX ? X-ray luminosity in (0.3-6keV) band for
sources within the D25 ellipse (1)
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Note (1): In 10+36erg/s, assuming a distance to NGC 55 of 1.78Mpc.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 19-Feb-2007