J/ApJ/686/859 Radio sources at 0.327, 1.4, 4.5, 8.5GHz (Birzan+, 2008)
Radiative efficiency and content of extragalactic radio sources: toward a
universal scaling relation between jet power and radio power.
Birzan L., McNamara B.R., Nulsen P.E.J., Carilli C.L., Wise M.W.
<Astrophys. J., 686, 859-880 (2008)>
=2008ApJ...686..859B 2008ApJ...686..859B
ADC_Keywords: Clusters, galaxy ; Galaxies, radio ; Radio continuum
Keywords: galaxies: active - galaxies: clusters: general - radio continuum:
galaxies - X-rays: galaxies - X-rays: galaxies: clusters
Abstract:
We present an analysis of the energetics and particle content of the
lobes of 24 radio galaxies at the cores of cooling clusters. The radio
lobes in these systems have created visible cavities in the
surrounding hot, X-ray-emitting gas, which allow direct measurement of
the mechanical jet power of radio sources over six decades of radio
luminosity, independently of the radio properties themselves. We find
that jet (cavity) power increases with radio synchrotron power
approximately as Pjet∼Lβradio, where 0.35≤β≤0.70
depending on the bandpass of measurement and state of the source.
Furthermore, we place limits on the magnetic field strengths and
particle content of the radio lobes using a variety of X-ray
constraints. We find that the lobe magnetic field strengths vary
between a few to several tens of microgauss depending on the age and
dynamical state of the lobes.
Description:
The sample consists of 22 galaxy clusters, one galaxy group (HCG 62),
and one elliptical galaxy (M84). In order to have radio data at
327MHz, 1.4GHz, 4.5GHz, and 8.5GHz, we observed 13 objects that did
not have VLA archival data at one or more of these frequencies. The
observations that we used for each frequency are given in Appendix A
(table 6 and 7).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 120 37 Radio fluxes and spectral indices
table6.dat 131 179 Summary of radio observations
table7.dat 79 92 Radio images properties
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See also:
J/AJ/130/1977 : FIRST-Optical-VLA survey for lensed radio lobes (Haarsma+,
2005)
J/AJ/109/853 : VLA survey of Abell clusters. IV. (Ledlow+ 1995)
J/ApJS/107/175 : Steep-spectrum radio galaxies VLA imaging (Rhee+, 1996)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name Source name
19- 24 F6.4 --- z Redshift
26- 36 A11 --- Comp Component (Lobes or Total)
38- 45 F8.3 Jy S327 ? VLA radio flux at 327MHz (1)
47- 53 F7.3 Jy e_S327 ? S327 uncertainty
55- 63 F9.4 Jy S1400 ? VLA radio flux at 1.4GHz (1)
65- 71 F7.4 Jy e_S1400 ? S1400 uncertainty
72 A1 --- f_S1400 [b] Indicates flux from litterature
74- 82 F9.5 Jy S4500 ? VLA radio flux at 4.5GHz (1)
84- 91 F8.5 Jy e_S4500 ? S4500 uncertainty
93-101 F9.5 Jy S8500 ? VLA radio flux at 8.5GHz (1)
103-110 F8.5 Jy e_S8500 ? S8500 uncertainty
112-115 F4.2 --- alpha ? The spectral index (2)
117-120 F4.2 --- e_alpha ? The spectral index uncertainty
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Note (1): When we have multiple final images of different resolutions (see Table
7), the lower resolution image was used to measure the flux, with the
exceptions of A133 and Hydra A. Hydra A: 74 and 327MHz radio maps are
from Lane et al. (2004AJ....127...48L 2004AJ....127...48L); Stotal74=441±20Jy,
Sinner-lobes74=219±10Jy, Souter-lobes74=221±30Jy.
A2597: 327MHz radio map is from Clarke et al. (2005ApJ...625..748C 2005ApJ...625..748C).
Note (2): The spectral index, α, was calculated using the fluxes at the
two lowest available frequencies assuming a power-law spectrum
(Sν∝ν-α).
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name Source name
19- 24 F6.1 MHz Freq1 Frequency of observation(s) (lower vound)
26 A1 --- --- [/]
27- 33 F7.2 MHz Freq2 ? Frequency of observation(s)
35 A1 --- f_Freq1 [*] Indicates our observations
37- 46 A10 MHz Bw Beam width(s)
48- 51 A4 --- Array VLA configuration
53- 78 A26 --- Obs Date(s) of the observation(s)
80- 87 A8 --- Exp Duration of integration time on source
89-104 A16 --- FluxC Flux calibrator(s) used
106-131 A26 --- PhaseC Phase calibrator(s) used
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Byte-by-byte Description of file: table7.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- Name Source name
19- 26 F8.3 MHz Freq Frequency
28 A1 --- f_Freq [ab] Flag on Freq (1)
30- 44 A15 --- Array VLA configuration
46- 56 A11 arcsec Res Resolution
58- 63 F6.2 deg PosAng Position angle
65- 72 F8.3 mJy RMS RMS noise in units of mJy/beam
74- 79 A6 --- Ref Reference(s) (2)
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Note (1): Flag as follows:
a = radio map from Lane et al. (2004AJ....127...48L 2004AJ....127...48L).
b = radio map from Clarke et al. (2005ApJ...625..748C 2005ApJ...625..748C).
Note (2): References as follows:
1 = Burns (1990AJ.....99...14B 1990AJ.....99...14B);
2 = Carilli et al. (1991ApJ...383..554C 1991ApJ...383..554C);
3 = Clarke et al. (2005ApJ...625..748C 2005ApJ...625..748C);
4 = Cohen et al. (2005ApJ...620L...5C 2005ApJ...620L...5C);
5 = Dreher et al. (1987ApJ...316..611D 1987ApJ...316..611D);
6 = Fabian et al. (2002MNRAS.331..369F 2002MNRAS.331..369F);
7 = Ge & Owen (1993AJ....105..778G 1993AJ....105..778G);
8 = Ge & Owen (1994AJ....108.1523G 1994AJ....108.1523G);
9 = Giovannini et al. (1998ApJ...493..632G 1998ApJ...493..632G);
10 = Gitti et al. (2006A&A...448..853G 2006A&A...448..853G);
11 = Hines et al. (1989ApJ...347..713H 1989ApJ...347..713H);
12 = Laing & Bridle (1987MNRAS.228..557L 1987MNRAS.228..557L);
13 = Lane et al. (2004AJ....127...48L 2004AJ....127...48L);
14 = Reiprich, T., Kempner, J., & Soker, N. (eds. 2003, The Riddle of Cooling
Flows in Galaxies and Clusters of Galaxies);
15 = McNamara et al. (2005Natur.433...45M 2005Natur.433...45M);
16 = Owen et al. (2000ApJ...543..611O 2000ApJ...543..611O);
17 = Parma et al. (1986A&AS...64..135P 1986A&AS...64..135P);
18 = Pedlar et al. (1990MNRAS.246..477P 1990MNRAS.246..477P);
19 = Sarazin et al. (1995ApJ...447..559S 1995ApJ...447..559S);
20 = Sarazin et al. (1995ApJ...451..125S 1995ApJ...451..125S);
21 = Slee et al. (2001AJ....122.1172S 2001AJ....122.1172S);
22 = Sun et al. (2003ApJ...587..619S 2003ApJ...587..619S);
23 = Taylor et al. (1990ApJ...360...41T 1990ApJ...360...41T);
24 = Taylor et al. (1994AJ....107.1942T 1994AJ....107.1942T);
25 = Taylor et al. (2002MNRAS.334..769T 2002MNRAS.334..769T);
26 = Taylor et al. (2006MNRAS.365..705T 2006MNRAS.365..705T);
27 = van Breugel et al. (1984ApJ...276...79V 1984ApJ...276...79V);
28 = Zhao et al. (1993ApJ...416...51Z 1993ApJ...416...51Z);
29 = Young (2004PhDT.......430Y 2004PhDT.......430Y);
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 05-Jan-2011