J/MNRAS/453/2682 Observation & modelling for radio-loud AGN (Ineson+, 2015)
The link between accretion mode and environment in radio-loud active galaxies.
Ineson J., Croston J.H., Hardcastle M.J., Kraft R.P., Evans D.A., Jarvis M.
<Mon. Not. R. Astron. Soc., 453, 2682-2706 (2015)>
=2015MNRAS.453.2682I 2015MNRAS.453.2682I (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, radio ; Active gal. nuclei ; Morphology ;
X-ray sources ; Abundances
Keywords: galaxies: active - galaxies: clusters: intracluster medium -
galaxies: jets
Abstract:
The interactions between radio-loud AGN and their environments play
an important role in galaxy and cluster evolution. Recent work has
demonstrated fundamental differences between high- and low-excitation
radio galaxies (HERGs and LERGs), and shown that they may have different
relationships with their environments. In the Chandra Large Project ERA
(Environments of Radio-loud AGN), we made the first systematic X-ray
environmental study of the cluster environments of radio galaxies at
a single epoch (z∼0.5), and found tentative evidence for a correlation
between radio luminosity and cluster X-ray luminosity. We also found that
this relationship appeared to be driven by the LERG subpopulation. We
have now repeated the analysis with a low-redshift sample (z∼0.1), and
found strong correlations between radio luminosity and environment richness
and between radio luminosity and central density for the LERGs but not
for the HERGs. These results are consistent with models in which the HERGs
are fuelled from accretion discs maintained from local reservoirs of gas,
while LERGs are fuelled more directly by gas ingested from the intracluster
medium. Comparing the samples, we found that although the maximum
environment richness of the HERG environments is similar in both samples,
there are poorer HERG environments in the z∼0.1 sample than in the z∼0.5
sample. We have therefore tentative evidence of evolution of the HERG
environments. We found no differences between the LERG subsamples for
the two epochs, as would be expected if radio and cluster luminosities
are related.
Description:
The new sample, hereafter referred to as the z0.1 sample, consists of all
radio-loud AGN with visible structure beyond the nucleus lying in the
redshift range 0.01=<z=<0.2 from two flux-limited radio surveys: the 3CRR
survey (Laing, Riley & Longair 1983, J/MNRAS/204/151) and the subsample
of the 2 Jy survey (Wall & Peacock 1985, J/MNRAS/216/173; Tadhunter et al.
1993MNRAS.263..999T 1993MNRAS.263..999T) defined by Dicken et al. (2008ApJ...678..712D 2008ApJ...678..712D). The
final sample consists of 55 sources comprising 25 HERGs and 30 LERGS.
All but two of the X-ray observations for the z0.1 sample came from the
Chandra archive; for 3C 31 and 3C 66B, we used observations from the
XMM-Newton archive. The XMM-Newton observations used the three EPIC cameras
with the medium filter and the Chandra observations used either the ACIS-S3
chip or the four ACIS-I chips.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 66 55 The z0.1 sample
table2.dat 57 55 Observation data for the z0.1 sample
table3.dat 89 55 Radial profile modelling - intracluster medium
(ICM, outer) β model
table4.dat 55 39 Radial profile modelling - host galaxy (inner)
β model
table5.dat 81 55 ICM X-ray luminosity and electron density
table6.dat 76 55 ICM temperatures
--------------------------------------------------------------------------------
See also:
J/MNRAS/204/151 : Bright radio sources at 178 MHz (3CRR) (Laing R.A., 1983)
J/MNRAS/216/173 : Bright extragalactic radio sources at 2.7 GHz
(Wall J.V., 1985)
J/MNRAS/419/687 : Morphology of luminous radio-loud AGN (Ramos Almeida+, 2012)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Source Source designation
13- 14 I2 h RAh Hour of Right Ascension (J2000)
16- 17 I2 min RAm Minute of Right Ascension (J2000)
19- 23 F5.2 s RAs Second of Right Ascension (J2000)
25 A1 --- DE- Sign of the Declination (J2000)
26- 27 I2 deg DEd Degree of Declination (J2000)
29- 30 I2 arcmin DEm Arcminute of Declination (J2000)
32- 36 F5.2 arcsec DEs Arcsecond of Declination (J2000)
38- 42 F5.3 --- z [0.017/0.195] Redshift
44- 47 F4.2 kpc/arcsec Scale [0.34/3.23] Scale
49- 53 F5.2 [W/Hz/sr] logL151 [24.16/27.14] 151 MHz radio luminosity
log10L151
55- 58 A4 --- Type Type of radio galaxy (1)
60 I1 --- Morph [1/2] Fanaroff-Riley morphology (2)
62- 66 F5.2 10+20/cm2 NH [0.86/18.1] Galactic hydrogen column density
--------------------------------------------------------------------------------
Note (1): Type as follows:
LERG = Low-excitation radio galaxy;
HERG = High-excitation radio galaxy.
Note (2): Morphology as follows:
1 = Fanaroff-Riley class I;
2 = Fanaroff-Riley class II.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Source Source designation
13 A1 --- Xray [CX] Chandra (C) or XMM-Newton (X) observation
15- 26 A12 --- ObsID Observation ID(s)
28- 33 F6.2 ks ExpTime [7.94/164.38] Exposure time (1)
35- 40 F6.2 ks ScrTime [7.94/163.17] Screened observation time (1)
42- 45 F4.2 GHz Freq [0.33/8.6] Radio map frequency
47- 55 A9 arcsec Res Resolution
57 I1 --- Ref [1/9] Reference (2)
--------------------------------------------------------------------------------
Note (1): pn camera times for XMM-Newton sources.
Note (2): Reference as follows:
1 = http://www.jb.man.ac.uk/atlas;
2 = Made from the VLA archives;
3 = Morganti et al. (1993MNRAS.263.1023M 1993MNRAS.263.1023M);
4 = Morganti et al. (1999A&AS..140..355M 1999A&AS..140..355M);
5 = Leahy et al. (1997MNRAS.291...20L 1997MNRAS.291...20L);
6 = Hardcastle et al. (2007ApJ...669..893H 2007ApJ...669..893H);
7 = Gizani & Leahy (2003MNRAS.342..399G 2003MNRAS.342..399G);
8 = Dennett-Thorpe et al. (2002MNRAS.330..609D 2002MNRAS.330..609D);
9 = Made from the ATCA archives.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Source Source designation
13- 19 A7 --- Model Model (1)
21- 24 A4 --- Meth Method (2)
26 A1 --- l_Rdet [>] Limit flag on Rdet
27- 30 I4 kpc Rdet [87/1432]? Maximum detection radius
32 A1 --- l_Cts [<] Limit flag on Cts
33- 38 I6 ct Cts [117/661760] Net counts (3)
40- 46 F7.1 --- chi2 [0.2/42289]? χ2 value
48- 49 I2 --- dof [2/62]? Degree of freedom
51- 54 F4.2 --- beta [0.3/1.2] Best-fitting β parameter
56- 59 F4.2 --- b_beta [0.3/0.69]? β Bayesian credible interval,
lower value
61- 64 F4.2 --- B_beta [0.37/1.5]? β Bayesian credible interval,
upper value
65 A1 --- f_beta [m] Flag indicating median value used for sources
with low counts
67- 73 F7.2 kpc rc [1.01/1165.77] Best-fitting core radius rc
75- 80 F6.2 kpc b_rc [0.82/253.47]? rc Bayesian credible interval,
lower value
82- 88 F7.2 kpc B_rc [4.17/1813.91]? rc Bayesian credible interval,
upper value
89 A1 --- f_rc [m] Flag indicating median value used for sources
with low counts
--------------------------------------------------------------------------------
Note (1): Single- or double-β model, or upper limit.
Note (2): Single or double background subtraction.
Note (3): Upper limits are counts within the median R500. Counts for
XMM-Newton sources are for the pn camera only.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Source Source designation
13- 19 F7.1 --- chi2 [0.2/42351] χ2 value
21- 22 I2 --- dof [3/62]? Degree of freedom
24- 27 F4.2 --- beta [0.53/2.99] Best-fitting β parameter
29- 32 F4.2 --- b_beta [0.3/1.65] β Bayesian credible interval,
lower value
34- 37 F4.2 --- B_beta [0.61/3.5] β Bayesian credible interval,
upper value
39- 43 F5.2 kpc rc [0.53/36.8] Best-fitting core radius rc
45- 49 F5.2 kpc b_rc [0.11/27.05] rc Bayesian credible interval,
lower value
51- 55 F5.2 kpc B_rc [0.88/47.4] rc Bayesian credible interval,
upper value
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Source Source designation
13- 19 F7.3 10+36W LX(bol)1 [0.033/111.3]? Bolometric X-ray luminosity
within the maximum detection radius
(in 1043 erg/s)
21- 25 F5.3 10+36W E_LX(bol)1 [0.003/8.571]? Upper limit uncertainty
in LX(bol)1
27- 31 F5.3 10+36W e_LX(bol)1 [0.004/8.57]? Lower limit uncertainty
in LX(bol)1
33- 36 I4 kpc R500 [329/1287] Radius R500
37 A1 --- n_R500 [m] Flag indicating median value used for
sources with low counts
39 A1 --- l_LX(bol)2 [<] Limit flag on LX(bol)2
40- 46 F7.3 10+36W LX(bol)2 [0.049/107.4] Bolometric X-ray luminosity
within R500 (in 1043 erg/s)
48- 52 F5.3 10+36W E_LX(bol)2 [0.003/9.146]? Upper limit uncertainty
in LX(bol)2
54- 58 F5.3 10+36W e_LX(bol)2 [0.005/9.147]? Lower limit uncertainty
in LX(bol)2
60 A1 --- l_h(z)LX [<] Limit flag on h(z)LX
61- 67 F7.3 10+36W h(z)LX [0.048/97.558] Bolometric X-ray luminosity
scaled by h-1(z) to correct for the
critical density evolution (in 1043 erg/s)
69 A1 --- l_ne [<] Limit flag on ne
70- 73 I4 m-3 ne [179/5140]? Electron density at 0.1R500
75- 77 I3 m-3 E_ne [4/504]? Upper limit uncertainty in ne
79- 81 I3 m-3 e_ne [4/354]? Lower limit uncertainty in ne
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Source Source designation
13- 23 A11 --- Meth Method
25- 29 F5.2 arcsec Ri [1.48/60] Inner radius of the annulus
31- 33 I3 arcsec Ro [49/600] Outer radius of the annulus
35- 38 F4.2 [Sun] Z [0.15/0.53] Metallicity (1)
40- 43 F4.2 [Sun] E_Z [0.02/0.69]? Upper limit uncertainty in Z
45- 48 F4.2 [Sun] e_Z [0.02/0.69]? Lower limit uncertainty in Z
50 A1 --- l_Temp [<] Limit flag on Temp
51- 54 F4.2 keV Temp [0.61/6.84] Temperature
56- 59 F4.2 keV E_Temp [0.01/1.1]? Upper limit uncertainty in Temp
61- 64 F4.2 keV e_Temp [0.01/1.35]? Lower limit uncertainty in Temp
66- 71 F6.1 --- chi2 [1.2/2198]? χ2 value
73- 76 I4 --- dof [6/1430]? Degree of freedom (2)
--------------------------------------------------------------------------------
Note (1): Metallicities without errors were used as fixed parameters.
Note (2): For temperatures from spectral analysis.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Tiphaine Pouvreau [CDS] 30-Jan-2020