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- Last Modified: 18-May-2007
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M33XMM2 - M33 XMM-Newton X-Ray Variability Source Catalog |
HEASARC Archive |
XMM-Newton survey of the Local Group galaxy M33.
Variability of the detected sources.
Misanovic Z., Pietsch W., Haberl F., Ehle M., Hatzidimitriou D.,
Trinchieri G
<Astron. Astrophys. 448, 1247 (2006)>
=2006A&A...448.1247M
Source_Number
A running number for the X-ray source in order of increasing
J2000.0 Right Ascension.
Name
The name of the X-ray source using the '[MPH2006]' prefix followed by
the X-ray source number, as recommended by the CDS Dictionary of Nomenclature
of Celestial Objects.
Alt_Name
An alternative designation for the X-ray source, when available,
from Pietsch et al. (2004, CDS Cat. <J/A+A/426/11>), using the prefix
of '[PMH2004]' followed by the X-ray source number, as recommended by the
CDS Dictionary of Nomenclature of Celestial Objects for sources listed in
this reference.
RA
The Right Ascension of the source in the selected equinox. This was
given in J2000.0 coordinates to a precision of 0.01 seconds of time in the
original table. The authors determined the relative shifts between their
overlapping observations using the positions of the common sources. Sources
were considered detected in two different fields if their positions were
closer than 3 times the combined statistical errors. They corrected all X-ray
positions relative to the observation 0141980801 (1c), since the X-ray source
positions in this observation showed the smallest offset with respect to
optical and infrared counterparts in their preliminary analysis. Moreover,
this field has sources in common with all other fields.
Dec
The Declination of the source in the selected equinox. This was
given in J2000.0 coordinates to a precision of 0.1 arcseconds in the
original table. The authors determined the relative shifts between their
overlapping observations using the positions of the common sources. Sources
were considered detected in two different fields if their positions were
closer than 3 times the combined statistical errors. They corrected all X-ray
positions relative to the observation 0141980801 (1c), since the X-ray source
positions in this observation showed the smallest offset with respect to
optical and infrared counterparts in their preliminary analysis. Moreover,
this field has sources in common with all other fields.
LII
The Galactic Longitude of the X-ray source.
BII
The Galactic Latitude of the X-ray source.
Error_Radius
The total positional error, in arcseconds, which includes the
statistical error and a systematic error of 0.5 arcseconds quadratically
summed.
Flux_Max
The maximum EPIC flux, in erg/cm^2/s, of the X-ray source in
the different observations in the XID band (0.2 - 4.5
keV), calculated from the vignetting-corrected count rate using the energy
conversion factors (ECF) for the PN and MOS medium, thin and thick filter,
obtained by W3PIMMS, taking 100% of the source counts and assuming a
power-law spectrum with a photon index of 1.7 absorbed by the Galactic
foreground column of 6 x 10^20 cm^-2. The various ECFs are listed in Table 3
of the reference paper. The assumed spectral model fits the majority of
the sources in the sample well. i.e., XRBs, AGN, or "hard" sources, while it
leads to an underestimation of the flux of soft sources (SNR, foreground stars,
SSSs) by approximately 10-20%, or even higher for extremely soft sources like
SSSs, especially if they are detected only in MOS data.
Flux_Max_Error
The error in the maximum EPIC flux, in erg/cm^2/s.
Var_Factor
The variability factor V of the X-ray source. V is defined as
F _max/F_min where F_max and F_min are the maximum and minimum source fluxes
in the XID band. If the source was not detected at the minimum level, then
F_min was determined as the 3-sigma upper limit to the XID flux.
Var_Significance
The variability significance S for the X-ray source.
S is defined as (F_max - F_min)/sqrt(sigma_max^2 + sigma_min^2), where
sigma_max and sigma_min are the errors in F_max and F_min, respectively.
Var_Factor_Flag
The variability flag V_FLAG is set to 1 to indicate
that the minimum XID flux was a non-detection, while for cases where
the minimum XID flux was a detection, it is set to 0.
Alt_Names_Comments
Alternative X-ray identifications for the X-ray
source from cross-correlations with sources detected in earlier surveys
of M 33, and brief comments on X-ray variability and other information
on the sources presented in these catalogs, as follows:
X-n = Long et al., 1981ApJ...246L..61L;
Trinchieri et al., 1988ApJ...329.1037T
SBn = Schulman & Bregman, 1995ApJ...441..568S
LCBn = Long et al., 1996ApJ...466..750L
DCL97= Dubus et al., 1997ApJ...490L..47D
DCL99= Dubus et al., 1999MNRAS.302..731D
HPn = Haberl & Pietsch, 2001A&A...373..438H
USNOB1_Name
The USNO-B1 counterpart to the X-ray source obtained from
positional cross-correlation.
Log_Fx_Fopt
The logarithm of the ratio of the X-ray flux to the optical
flux for the source (the latter using the USNO-B1 data).
TwoMASS_Name
The 2MASS counterpart to the X-ray source obtained from
positional cross-correlation.
Jmag
The 2MASS J magnitude of the IR counterpart to the X-ray source.
Hmag
The 2MASS H Magnitude of the IR counterpart to the X-ray source.
Kmag
The 2MASS K Magnitude of the IR counterpart to the X-ray source.
NVSS_Name
The NVSS counterpart to the X-ray source obtained from
positional cross-correlation.
Flux_21_cm
The NVSS 1.4-GHz flux density, in mJy, of the radio
counterpart to the X-ray source.
Source_Type
A classification of the X-ray source, first used by
Pietsch et al. (2004, A&A, 426, 11 = PMH2004), and discussed in detail
in Section 9 of the reference paper, as follows:
fgStar = foreground star
<fgStar> = foreground star candidate
AGN = active galactic nucleus
<AGN> = AGN candidate
GAL = galaxy
<GAL> = galaxy candidate
SSS = supersoft source in M33
<SSS> = supersoft source candidate in M33
SNR = supernova remnant in M 33
<SNR> = supernova remnant candidate in M33
XRB = X-ray binary in M 33
<hard> = HR2 - sigma_HR2 > -0.2, or only HR3 and HR4 defined,
and no other classification (See PMH2004 for HRn definitions)
Additional_Comments
Additional comments and other identifications for
the X-ray source or its counterpart in other energy bands, with their
associated references, as follows:
SIM = SIMBAD Database
NED = NASA Extragalactic Database
NVSS = Condon et al., 1998AJ....115.1693C
CS82 = Christian & Schommer, 1982ApJ...253L..13C
[MC83]25 = Massey & Conti, 1983ApJ...273..576M
IFM* = Ivanov et al., 1993ApJS...89...85I
GKLn = Gordon et al., 1998ApJS..117...89G
GDKn = Gordon et al., 1999ApJS..120..247G
TYC2293-810-1 = Hog et al., 1998A&A...335L..65H
IV74 = Israel & van der Kruit, 1974A&A....32..363I
VBW78 = von Kap-Herr et al., 1978A&A....62...51V
M98 = Massey, 1998ApJ...501..153M
MCM2001 = Magrini et al., 2001A&A...367..498M
MBH96 = Massey et al., 1996ApJ...469..629M
PMM2004 = Pietsch et al., 2004A&A...413..879P
GM94 = Giovagnoli & Mould, 1994PASP..106..376G
FS95b = Fabrika et al., 1995Ap&SS.226..229F
FSZ = Fabrika et al., 1997BSAO...43..133F
D33 = Macri et al., 2001AJ....121..870M;
Mochejska et al., 2001AJ....121.2032M
RW93 = Regan & Wilson, 1993AJ....105..499R
VHK = Hubble, 1926ApJ....63..236H
CGC97 = Crampton et al., 1997AJ....114.2353C
BCLMP = Boulesteix et al., 1974A&A....37...33B
Class
The HEASARC Browse object classification based on the value of the
source_type parameter.