J/ApJS/227/31 X-ray cavities from isolated gal. to clusters (Shin+, 2016)
A systematic search for X-ray cavities in galaxy clusters, groups, and
elliptical galaxies.
Shin J., Woo J.-H., Mulchaey J.S.
<Astrophys. J. Suppl. Ser., 227, 31-31 (2016)>
=2016ApJS..227...31S 2016ApJS..227...31S (SIMBAD/NED BibCode)
ADC_Keywords: X-ray sources ; Clusters, galaxy ; Redshifts
Keywords: X-rays: galaxies: clusters
Abstract:
We perform a comprehensive study of X-ray cavities using a large
sample of X-ray targets selected from the Chandra archive. The sample
is selected to cover a large dynamic range including galaxy clusters,
groups, and individual galaxies. Using β-modeling and unsharp
masking techniques, we investigate the presence of X-ray cavities for
133 targets that have sufficient X-ray photons for analysis. We detect
148 X-ray cavities from 69 targets and measure their properties,
including cavity size, angle, and distance from the center of the
diffuse X-ray gas. We confirm the strong correlation between cavity
size and distance from the X-ray center similar to previous studies.
We find that the detection rates of X-ray cavities are similar among
galaxy clusters, groups and individual galaxies, suggesting that the
formation mechanism of X-ray cavities is independent of environment.
Description:
To search X-ray cavities, we used available Chandra X-ray images,
which provide high spatial resolution (PSF FWHM ∼0.5" at the aim
point). We considered sources in the Chandra archive in one of three
categories, namely, "normal galaxies", "cluster of galaxies", and
"active galaxies and quasar". For our cavity study, we used a final
sample of 133 targets based on a consistent analysis of X-ray photon
counts.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 69 133 Target list
table2.dat 46 148 X-ray cavity properties for 69 targets
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See also:
B/chandra : The Chandra Archive Log (CXC, 1999-2014)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Name Object Name
20- 21 I2 h RAh Hour of Right Ascension (J2000)
23- 24 I2 min RAm Minute of Right Ascension (J2000)
26- 27 I2 s RAs Second of Right Ascension (J2000)
29- 29 A1 --- DE- Sign of the Declination (J2000)
30- 31 I2 deg DEd Degree of Declination (J2000)
33- 34 I2 arcmin DEm Arcminute of Declination (J2000)
36- 37 I2 arcsec DEs Arcsecond of Declination (J2000)
39- 43 F5.3 --- z [0.001/2.8] Redshift from NED
(NASA/IPAC extragalactic database)
45- 49 F5.2 10+20cm-2 nH [1.2/76.1] Column density
51- 51 A1 --- r_nH x= Dickey & Lockman (1990ARA&A..28..215D 1990ARA&A..28..215D)
53- 57 F5.2 keV T [0.3/15] Gas Temperature
59- 62 F4.2 keV e_T [0/2] Lower uncertainty on T
64- 67 F4.2 keV E_T [0/3] Upper uncertainty on T
69 I1 --- Det [1/3] Class of X-ray cavity detection (G1)
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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- 18 A18 --- Name Object Name
20 A1 --- Cav [a-g] Cavity identifier in Name
22- 25 F4.1 kpc amaj [0.2/92.1] Cavity size ra, semimajor axis
27- 30 F4.1 kpc bmin [0.1/79.2] Cavity size rb, semiminor axis
32- 38 F7.1 kpc2 Area [0.1/22922] Cavity Area
40- 44 F5.1 kpc Dist [0.2/168]? Distance, X-ray gas emission center
to X-ray cavity center
46 I1 --- Det [1/2] Detection image (G1)
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Global notes:
Note (G1): Class of X-ray cavity detection as follows:
1 = X-ray cavities detected from raw images;
2 = X-ray cavities detected from beta-model subtracted images;
3 = X-ray cavities non-detected.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 11-Jan-2017