Search in Xamin or Browse... |
## ACCEPTCAT - Archive of Chandra Cluster Entropy Profile Tables (ACCEPT) Catalog |
HEASARC Archive |

All data and results associated with this work are publicly available via the project web site http://www.pa.msu.edu/astro/MC2/accept/.

The sample is collected from observations taken with the Chandra X-ray Observatory and which were publicly available in the CDA (Chandra Data Archive) as of 2008 August.

Intracluster medium entropy profiles for a Chandra archival sample of galaxy clusters. Cavagnolo K.W., Donahue M., Voit G.M., Sun M. <Astrophys. J. Suppl. Ser., 182, 12-32 (2009)> =2009ApJS..182...12C

**Name**

The name of the cluster of galaxies

**ObsID_1**

The Chandra observation identifier (ObsID) for the dataset used
in the analysis of the particular cluster. Some clusters have been observed
multiple times by Chandra, notice, in which case this is the first such
observation

**RA**

The Right Ascension of the cluster center in the selected equinox.
This was given in J2000.0 equatorial coordinates to a precision of 0.001
seconds of time in the original table.

**Dec**

The Declination of the cluster center in the selected equinox.
This was given in J2000.0 equatorial coordinates to a precision of 0.01
arcseconds in the original table.

**LII**

The Galactic Longitude of the cluster center.

**BII**

The Galactic Latitude of the cluster center.

**Exposure_Obsid_1**

The exposure time for the (first if multiple observations
were made) Chandra observation, in seconds (converted by the HEASARC from the
kilosecond units given in the reference paper).

**Center_CCD_Obsid_1**

The ACIS CCD on which the cluster center is located in
the first Chandra observation.

**Redshift**

The redshift of the cluster of galaxies.

**kT**

The average cluster ICM temperature, in keV.

**Notes**

Codes for assigned note(s) for the specified clusters of galaxies,
as follows:

a = Clusters analyzed using the best-fit beta-model for the surface brightness profiles (discussed in Sect. 3.2 of the reference paper); b = Clusters with complex surface brightness of which only the central regions were used in fitting K(r); c = Clusters only used during analysis of the HIFLUGCS sub-sample (discussed in Sect. 5.4 of the reference paper); d = Clusters with central AGN removed during analysis (discussed in Sect. 3.5 of the reference paper); e = Clusters with central compact source removed during analysis (discussed in Sect. 3.5 of the reference paper); f = Clusters with central bin ignored during fitting (discussed in Sect. 3.5 of the reference paper).

**ObsID_2**

The Chandra observation identifier (ObsID) for the second dataset
used in the analysis of the particular cluster

**Exposure_Obsid_2**

The exposure time for the second Chandra observation, in
seconds (converted by the HEASARC from the kilosecond units given in the
reference paper).

**Center_CCD_Obsid_2**

The ACIS CCD on which the cluster center is located in
the second Chandra observation.

**ObsID_3**

The Chandra observation identifier (ObsID) for the third dataset
used in the analysis of the particular cluster

**Exposure_Obsid_3**

The exposure time for the third Chandra observation, in
seconds (converted by the HEASARC from the kilosecond units given in the
reference paper).

**Center_CCD_Obsid_3**

The ACIS CCD on which the cluster center is located in
the third Chandra observation.

**ObsID_4**

The Chandra observation identifier (ObsID) for the fourth
dataset used in the analysis of the particular cluster

**Exposure_Obsid_4**

The exposure time for the fourth Chandra observation, in
seconds (converted by the HEASARC from the kilosecond units given in the
reference paper).

**Center_CCD_Obsid_4**

The ACIS CCD on which the cluster center is located in
the fourth Chandra observation.

**ObsID_5**

The Chandra observation identifier (ObsID) for the
fifth dataset used in the analysis of the particular cluster

**Exposure_Obsid_5**

The exposure time for the fifth Chandra observation, in
seconds (converted by the HEASARC from the kilosecond units given in the
reference paper).

**Center_CCD_Obsid_5**

The ACIS CCD on which the cluster center is located in
the fifth Chandra observation.

**ObsID_6**

The Chandra observation identifier (ObsID) for the sixth dataset
used in the analysis of the particular cluster

**Exposure_Obsid_6**

The exposure time for the sixth Chandra observation, in
seconds (converted by the HEASARC from the kilosecond units given in the
reference paper).

**Center_CCD_Obsid_6**

The ACIS CCD on which the cluster center is located in
the sixth Chandra observation.

**ObsID_7**

The Chandra observation identifier (ObsID) for the seventh dataset
used in the analysis of the particular cluster

**Exposure_Obsid_7**

The exposure time for the seventh Chandra observation, in
seconds (converted by the HEASARC from the kilosecond units given in the
reference paper).

**Center_CCD_Obsid_7**

The ACIS CCD on which the cluster center is located in
the seventh Chandra observation.

**Fit_Method_1**

The method of T_{X} interpolation performed for the inner
region of the cluster for the first fit, where a single temperature bin
encompasses several density profile bins: 'flat' meaning Delta-T_{center} = 0,
i.e., the temperature across the central density bins is assumed to be
isothermal, or 'extr' meaning that the temperature is free to decline across
the central density bins, assuming a linear gradient consistent with the
slope of the temperature profile at radii larger than the central T_{X}
bin, i.e., a linear extrapolation is used.

**Num_Radial_Bins**

The number of radial bins included in the fit.

**Max_Fit_Radius**

The maximum radius for the fit, in Mpc.

**BF_Core_Entropy_1**

The best-fit core entropy, K_{0}, in keV cm^{2}, for
the first fit, using the model distribution specified by equation (4) in the
reference paper (if non-zero), or, if the model distribution is that specified
by equation (5) of the reference paper, the value of 0.0.

**BF_Core_Entropy_1_Error**

The uncertainty in the corresponding parameter,
in the same units as that parameter. If blank, this parameter was either not
included in the fit or set to a fixed value.

**Num_Sigma_K0_Gt_0_1**

The number of sigma that the best-fit value for the
core entropy K_{0} differs from zero, for the first fit. This is left blank
in fits where model distribution is that specified
by equation (5) of the reference paper, since in them the value of 0.0 for
K_{0} is adopted a priori.

**BF_100k_Entropy_1**

The best-fit entropy, K_{100}, at 100 kpc radius, in keV
cm^{2}, for the first fit, using the model distribution specified by equation
(4) in the reference paper if K_{0} is non-zero, or by that specified by
equation (5) of the reference paper if the value of K_{0} is 0.0.

**BF_100k_Entropy_1_Error**

The uncertainty in the corresponding parameter,
in the same units as that parameter.

**Alpha_1**

The best-fit power-law index alpha of the radial entropy profile,
for the first fit.

**Alpha_1_Error**

The uncertainty in the corresponding parameter,
in the same units as that parameter.

**DoF_1**

The number of degrees of freedom (dof) for the first fit.

**Chi_Squared_1**

The chi-squared statistic of the best-fit model for
the first fit.

**P_Value_1**

The p-value probability for the first fit, given the
Chi-Squared and degrees of freedom, i.e., the probability of obtaining
a test statistic at least as extreme as the one that was actually obtained

**Fit_Method_2**

The method of T_{X} interpolation performed for the inner
region of the cluster for the second fit, where a single temperature bin
encompasses several density profile bins: 'flat' meaning Delta-T_{center} = 0,
i.e., the temperature across the central density bins is assumed to be
isothermal, or 'extr' meaning that the temperature is free to decline across
the central density bins, assuming a linear gradient consistent with the
slope of the temperature profile at radii larger than the central T_{X}
bin, i.e., a linear extrapolation is used.

**BF_Core_Entropy_2**

The best-fit core entropy, K_{0}, in keV cm^{2}, for
the second fit, using the model distribution specified by equation (4) in the
reference paper (if non-zero), or, if the model distribution is that specified
by equation (5) of the reference paper, the value of 0.0.

**BF_Core_Entropy_2_Error**

The uncertainty in the corresponding parameter,
in the same units as that parameter. If blank, this parameter was either not
included in the fit or set to a fixed value.

**Num_Sigma_K0_Gt_0_2**

The number of sigma that the best-fit value for the
core entropy K_{0} differs from zero, for the second fit. This is left blank
in fits where model distribution is that specified
by equation (5) of the reference paper, since in them the value of 0.0 for
K_{0} is adopted a priori.

**BF_100k_Entropy_2**

The best-fit entropy, K_{100}, at 100 kpc radius, in keV
cm^{2}, for the second fit, using the model distribution specified by equation
(4) in the reference paper if K_{0} is non-zero, or by that specified by
equation (5) of the reference paper if the value of K_{0} is 0.0.

**BF_100k_Entropy_2_Error**

The uncertainty in the corresponding parameter,
in the same units as that parameter.

**Alpha_2**

The best-fit power-law index alpha of the radial entropy profile,
for the second fit.

**Alpha_2_Error**

The uncertainty in the corresponding parameter,
in the same units as that parameter.

**DoF_2**

The number of degrees of freedom (dof) for the second fit.

**Chi_Squared_2**

The chi-squared statistic of the best-fit model for
the second fit.

**P_Value_2**

The p-value probability for the second fit, given the
Chi-Squared and degrees of freedom, i.e., the probability of obtaining
a test statistic at least as extreme as the one that was actually obtained

**Fit_Method_3**

The method of T_{X} interpolation performed for the inner
region of the cluster for the third fit, where a single temperature bin
encompasses several density profile bins: 'flat' meaning Delta-T_{center} = 0,
i.e., the temperature across the central density bins is assumed to be
isothermal, or 'extr' meaning that the temperature is free to decline across
the central density bins, assuming a linear gradient consistent with the
slope of the temperature profile at radii larger than the central T_{X}
bin, i.e., a linear extrapolation is used.

**BF_Core_Entropy_3**

The best-fit core entropy, K_{0}, in keV cm^{2}, for
the third fit, using the model distribution specified by equation (4) in the
reference paper (if non-zero), or, if the model distribution is that specified
by equation (5) of the reference paper, the value of 0.0.

**BF_Core_Entropy_3_Error**

The uncertainty in the corresponding parameter,
in the same units as that parameter. If blank, this parameter was either not
included in the fit or set to a fixed value.

**Num_Sigma_K0_Gt_0_3**

The number of sigma that the best-fit value for the
core entropy K_{0} differs from zero, for the third fit. This is left blank
in fits where model distribution is that specified
by equation (5) of the reference paper, since in them the value of 0.0 for
K_{0} is adopted a priori.

**BF_100k_Entropy_3**

The best-fit entropy, K_{100}, at 100 kpc radius, in keV
cm^{2}, for the third fit, using the model distribution specified by equation
(4) in the reference paper if K_{0} is non-zero, or by that specified by
equation (5) of the reference paper if the value of K_{0} is 0.0.

**BF_100k_Entropy_3_Error**

The uncertainty in the corresponding parameter,
in the same units as that parameter.

**Alpha_3**

The best-fit power-law index alpha of the radial entropy profile,
for the third fit.

**Alpha_3_Error**

The uncertainty in the corresponding parameter,
in the same units as that parameter.

**DoF_3**

The number of degrees of freedom (dof) for the third fit.

**Chi_Squared_3**

The chi-squared statistic of the best-fit model for
the third fit.

**P_Value_3**

The p-value probability for the third fit, given the
Chi-Squared and degrees of freedom, i.e., the probability of obtaining
a test statistic at least as extreme as the one that was actually obtained

**Fit_Method_4**

The method of T_{X} interpolation performed for the inner
region of the cluster for the fourth fit, where a single temperature bin
encompasses several density profile bins: 'flat' meaning Delta-T_{center} = 0,
i.e., the temperature across the central density bins is assumed to be
isothermal, or 'extr' meaning that the temperature is free to decline across
the central density bins, assuming a linear gradient consistent with the
slope of the temperature profile at radii larger than the central T_{X}
bin, i.e., a linear extrapolation is used.

**BF_Core_Entropy_4**

The best-fit core entropy, K_{0}, in keV cm^{2}, for
the fourth fit, using the model distribution specified by equation (4) in the
reference paper (if non-zero), or, if the model distribution is that specified
by equation (5) of the reference paper, the value of 0.0.

**BF_Core_Entropy_4_Error**

The uncertainty in the corresponding parameter,
in the same units as that parameter. If blank, this parameter was either not
included in the fit or set to a fixed value.

**Num_Sigma_K0_Gt_0_4**

The number of sigma that the best-fit value for the
core entropy K_{0} differs from zero, for the fourth fit. This is left blank
in fits where model distribution is that specified
by equation (5) of the reference paper, since in them the value of 0.0 for
K_{0} is adopted a priori.

**BF_100k_Entropy_4**

The best-fit entropy, K_{100}, at 100 kpc radius, in keV
cm^{2}, for the fourth fit, using the model distribution specified by equation
(4) in the reference paper if K_{0} is non-zero, or by that specified by
equation (5) of the reference paper if the value of K_{0} is 0.0.

**BF_100k_Entropy_4_Error**

The uncertainty in the corresponding parameter,
in the same units as that parameter.

**Alpha_4**

The best-fit power-law index alpha of the radial entropy profile,
for the fourth fit.

**Alpha_4_Error**

The uncertainty in the corresponding parameter,
in the same units as that parameter.

**DoF_4**

The number of degrees of freedom (dof) for the fourth fit.

**Chi_Squared_4**

The chi-squared statistic of the best-fit model for
the fourth fit.

**P_Value_4**

The p-value probability for the fourth fit, given the
Chi-Squared and degrees of freedom, i.e., the probability of obtaining
a test statistic at least as extreme as the one that was actually obtained.