J/A+A/451/835 Properties of X-ray sources in M31/M33 (Hatzidimitriou+, 2006)
Spectroscopy of the brightest optical counterparts of X-ray sources in the
direction of M 31 and M 33.
Hatzidimitriou D., Pietsch W., Misanovic Z., Reig P., Haberl F.
<Astron. Astrophys. 451, 835 (2006)>
=2006A&A...451..835H 2006A&A...451..835H
ADC_Keywords: Galaxies, nearby ; X-ray sources ; Cross identifications
Keywords: galaxies: individual: M 31 - galaxies: individual: M 33 -
X-rays: galaxies - X-rays: stars - Local Group
Abstract:
We have obtained optical spectra for the 14 brightest optical
counterparts of X-ray sources identified by XMM-Newton in the
direction of M 31 and for 21 optical counterparts in the direction of
M 33, using the 1.3m Skinakas telescope in Crete, Greece.
Description:
The optical observations used in this study were carried out during
three observing runs, on September 6, 2003, on October 18-22, 2003 and
on October 10-11, 2004, using the 1.3-m Ritchey-Cretien telescope at
Skinakas Observatory, located on the island of Crete (Greece).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 108 40 Log of objects observed in the direction of M 31
and M 33 and derived spectral types
table2.dat 58 33 X-ray properties of the objects of Table 1
notes.dat 80 26 Individual notes
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See also:
B/xmm : XMM-Newton Observation Log (XMM-Newton SOC, 2002)
J/A+A/426/11 : XMM-Newton survey of M33 (Pietsch+, 2004)
J/A+A/373/438 : The X-ray view of M33 after ROSAT (Haberl+ 2001)
J/A+A/434/483 : An XMM-Newton survey of M 31 (Pietsch+, 2005)
J/A+A/373/63 : M31 second ROSAT PSPC survey (Supper+, 2001)
J/ApJ/577/738 : M31 Chandra X-ray point sources (Kong+, 2002)
J/ApJ/578/114 : Chandra HRC source in M31 (Kaaret, 2002)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Gal Galaxy (M 31 or M 33)
6- 8 I3 --- Seq Sequential number (G1)
9 A1 --- m_Seq [b] Multiplicity index on Seq (1)
11 A1 --- n_Seq [a-g] Individual note (in notes.dat)
13- 14 I2 h RAh Right ascension (J2000)
16- 17 I2 min RAm Right ascension (J2000)
19- 23 F5.2 s RAs Right ascension (J2000)
25 A1 --- DE- Declination sign (J2000)
26- 27 I2 deg DEd Declination (J2000)
29- 30 I2 arcmin DEm Declination (J2000)
32- 35 F4.1 arcsec DEs Declination (J2000)
37- 48 A12 --- USNO-B1 USNO-B1 I/284 identification
50- 54 F5.2 mag Bmag ? USNO B magnitude (B2 in USNOB-1) (2)
56- 60 F5.2 mag Rmag ? USNO R magnitude (R2 in USNOB-1) (2)
62- 77 A16 --- 2MASS 2MASS II/246 identification
79- 83 F5.2 mag Jmag ? 2MASS J magnitude
85- 94 A10 "DD/MM/YYYY" Date Date of the Skinakas observation
96- 99 I4 s ExpTime ? Total exposition time
101 I1 --- Nobs ? Number of exposure
103-108 A6 --- SpType MK spectral type of optical counterpart
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Note (1): Object 3b in the direction of M 33, which was not detected by the
automatic procedures due to its far off-axis location and thus it was
not included in PMH2004, J/A+A/426/11 (see Sect. 5.2 for more
details).
Note (2): The limiting magnitude of the sample of stars observed in M 33 was
R=14.75, while in M 31 it was 12.43. In neither case is the sample of
objects observed complete to the corresponding limiting magnitude.
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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- 4 A4 --- Gal Galaxy (M 31 or M 33)
6- 8 I3 --- Seq Sequential number (G1)
10 A1 --- n_Seq [h-j] Note on Seq (in notes.dat)
12- 19 E8.3 mW/m2 FX X-ray flux in 0.2-4.5keV band
21- 27 E7.2 mW/m2 e_FX rms uncertainty on FX
29- 32 F4.1 [-] logFX/Fopt ? logarithm of the ratio of the X-ray flux to
the optical flux
34- 37 F4.2 [-] e_logFX/Fopt ? rms uncertainty on logFX/Fopt
39- 42 F4.2 --- HR1 Hardness ratio 1, HR1=(R2-R1)/(R2+R1) (1)
44- 47 F4.2 --- e_HR1 rms uncertainty on HR1
49- 53 F5.2 --- HR2 Hardness ratio 2, HR2=(R3-R2)/(R3+R2) (1)
55- 58 F4.2 --- e_HR2 rms uncertainty on HR2
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Note (1): The hardness ratios were derived from the count rates in the
energy bands R1=0.2-0.5keV, R2=0.5-1.0keV,and R3=1.0-2.0keV, according
to the formulae HR1=(R2-R1)/(R2+R1) and HR2=(R3-R2)/(R3+R2)
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1 A1 --- Note Note code
3- 80 A78 --- Text Text of the note
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Global notes:
Note (G1): X-ray source number of the target as it appears in the
corresponding X-ray catalogue paper, i.e.,
-- for M 31: Pietsch et al., 2005, J/A+A/434/483, [PFH2005] NNN
-- for M 33: Pietsch et al., 2004, J/A+A/426/11, [PMH2004] NNN
exception of object 3b (See note (1) in table1)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 05-May-2006