J/MNRAS/376/960 X-ray emission from the Sombrero galaxy (NGC 4594) (Li+, 2007)
Chandra and XMM-Newton detection of large-scale diffuse X-ray emission from the
Sombrero galaxy.
Li Z., Wang Q.D., Hameed S.
<Mon. Not. R. Astron. Soc., 376, 960-976 (2007)>
=2007MNRAS.376..960L 2007MNRAS.376..960L
ADC_Keywords: Galaxies, nearby ; X-ray sources
Keywords: galaxies: general - galaxies: individual: Sombrero, NGC 4594 -
galaxies: spiral - X-rays: general
Abstract:
We present an X-ray study of the massive edge-on Sa galaxy, Sombrero
(M 104; NGC 4594), based on XMM-Newton and Chandra observations. A list
of 62 XMM-Newton and 175 Chandra discrete X-ray sources is provided,
the majority of which are associated with the galaxy. Spectral
analysis is carried out for relatively bright individual sources and
for an accumulated source spectrum.
Description:
The Chandra ACIS-S observation of Sombrero (Obs. ID. 1586) was taken
on 2001 May 31 with an exposure of 18.8ks.
The XMM-Newton EPIC observation of Sombrero (Obs. ID 0084030101) was
taken on 2001 December 28, with the thin filter and with a total
exposure of 43ks.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 63 175 Chandra source list
table3.dat 64 62 XMM-Newton source list
table4.dat 49 8 Matching results with 2MASS
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See also:
J/ApJ/599/1067 : X-ray sources in M104 (Di Stefano+, 2003)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
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1- 3 I3 --- [LWH2007] [1/175] Source designation,
[LWH2007] Chandra NNN in Simbad
5- 23 A19 --- CXOU CXOU name (JHHMMSS.ss-DDMMSS.s)
25- 27 F3.1 arcsec e_Pos Position uncertainty (1σ) calculated
from the maximum likelihood centroiding
29- 34 F6.2 ct/ks CR On-axis source broad-band count rate (1)
36- 39 F4.2 ct/ks e_CR rms uncertainty on CR
41- 45 F5.2 --- HR ?=- Harness ratio, HR=(H-S2)/(H+S2) (2)
47- 50 F4.2 --- e_HR ?=- rms uncertainty on HR
52- 56 F5.2 --- HR1 ?=- Harness ratio 1, HR1=(S2-S1)/S (2)
58- 61 F4.2 --- e_HR1 ?=- rms uncertainty on HR1
63 A1 --- Band [BSH] band in which a source is detected with
the most accurate position that is adopted
in Position uncertainty (e_Pos)
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Note (1): The sum of the exposure-corrected CRs in the four bands.
Note (2): Definition of the bands:
S1=0.3-0.7keV, S2=0.7-1.5keV, H1=1.5-3keV and H2=3-7keV.
In addition, S=S1+S2, H=H1+H2 and B=S+H.
The hardness ratios defined as HR=(H-S2)/(H+S2), and HR1=(S2-S1)/S,
listed only for values with uncertainties less than 0.2.
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- [LWH2007] [1/62] Source designation,
[LWH2007] XMM NNN in Simbad
5- 23 A19 --- XMMU XMMU name (JHHMMSS.ss-DDMMSS.s)
25- 27 F3.1 arcsec e_Pos Position uncertainty (1σ) calculated
from the maximum likelihood centroiding
29- 34 F6.2 ct/ks CR On-axis source broad-band count rate (1)
36- 40 F5.2 ct/ks e_CR rms uncertainty on CR
42- 46 F5.2 --- HR ?=- Harness ratio, HR=(H-S2)/(H+S2) (2)
48- 51 F4.2 --- e_HR ?=- rms uncertainty on HR
53- 57 F5.2 --- HR1 ?=- Harness ratio1, HR1=(S2-S1)/S (2)
59- 62 F4.2 --- e_HR1 ?=- rms uncertainty on HR1
64 A1 --- Band [BSH] band in which a source is detected with
the most accurate position that is adopted
in Position uncertainty (e_Pos)
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Note (1): The sum of the exposure-corrected CRs in the four bands.
Note (2): Definition of the bands:
S1=0.5-1keV, S2=1-2keV, H1=2-4.5keV and H2=4.5-7.5keV.
In addition, S=S1+S2, H=H1+H2 and B=S+H.
The hardness ratios defined as HR=(H-S2)/(H+S2), and HR1=(S2-S1)/S,
listed only for values with uncertainties less than 0.2.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- List [XA XP] XA for table2, XP for table3
3 A1 --- --- [-]
4- 6 I3 --- [LWH2007] Source designation
8- 26 A19 --- Name Name (JHHMMSS.ss+DDMMSS.s)
28- 30 F3.1 arcsec Dox Distance between X-ray and optical position
32- 34 F3.1 arcsec e_Dox rms uncertainty on Dox
36- 39 F4.1 mag Jmag J magnitude
41- 44 F4.1 mag Hmag H magnitude
46- 49 F4.1 mag Kmag K magnitude
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 28-Sep-2007