2008A&A...486..119B


Query : 2008A&A...486..119B

2008A&A...486..119B - Astronomy and Astrophysics, volume 486, 119-130 (2008/7-4)

The accretion mechanism in low-power radio galaxies.

BALMAVERDE B., BALDI R.D. and CAPETTI A.

Abstract (from CDS):

We study a sample of 44 low-luminosity radio-loud AGN, which represent a range of nuclear radio-power spanning 5 orders of magnitude, to unveil the accretion mechanism in these galaxies. We estimate the accretion rate of gas associated with their hot coronae by analyzing archival Chandra data, to derive the deprojected density and temperature profiles in a spherical approximation. Measuring the jet power from the nuclear radio-luminosity, we find that the accretion power correlates linearly with the jet power, with an efficiency of conversion from rest mass into jet power of ∼0.012. These results strengthen and extend the validity of the results obtained by Allen and collaborators for 9 radio galaxies, indicating that hot gas accretion is the dominant process in FR I radio galaxies across their full range of radio-luminosity. We find that the different levels of nuclear activity are driven by global differences in the structure of the galactic hot coronae. A linear relation links the jet power with the host X-ray surface brightness. This implies that a substantial change in the jet power must be accompanied by a global change in its ISM properties, driven for example by a major merger. This correlation provides a simple widely applicable method to estimate the jet-power of a given object by observing the intensity of its host X-ray emission. To maintain the mass flow in the jet, the fraction of gas that crosses the Bondi radius reaching the accretion disk must be >0.002. This implies that the radiative efficiency of the disk must be η≲0.005, an indication that accretion in these objects occurs not only at a lower rate, but also at lower efficiency than in standard accretion disks.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: jets - galaxies: elliptical and lenticular, cD - galaxies: ISM

CDS comments: NGC 7898 is a misprint for UGC 7898

Simbad objects: 46

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Number of rows : 46
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 87GB 005314.6+260945 BiC 00 55 50.583 +26 24 36.68   18.63 19.57 16.26   ~ 209 1
2 NGC 383 rG 01 07 24.9647814840 +32 24 45.132586200   13.6 12.14     ~ 782 3
3 NGC 507 BiC 01 23 39.950 +33 15 22.22   13.0       ~ 440 3
4 NGC 524 GiP 01 24 47.7429545736 +09 32 20.089023900   11.5       ~ 466 1
5 UGC 1841 Sy1 02 23 11.41124925 +42 59 31.3853324   15.71 14.81     ~ 562 2
6 3C 75 PaG 02 57 41.64 +06 01 28.0           ~ 300 1
7 NGC 1218 Sy1 03 08 26.22380005 +04 06 39.3007808   12.84       ~ 383 1
8 NGC 1265 GiC 03 18 15.674 +41 51 27.94   14.7       ~ 368 2
9 3C 84 Sy2 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4017 3
10 NGC 1316 BL? 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1394 1
11 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1572 1
12 NGC 2484 Sy2 07 58 28.10812817 +37 47 11.8076475   14.15 14.9     ~ 269 1
13 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1464 0
14 NGC 3557 Sy1 11 09 57.653 -37 32 21.02   11.50 10.40 9.79   ~ 276 2
15 [VV2006] J111654.8+180304 QSO 11 16 54.7 +18 03 06   13.84 12.76     ~ 470 0
16 NGC 3862 Sy2 11 45 05.00904503 +19 36 22.7409909   14.98 13.97     ~ 604 3
17 NGC 4168 Sy1 12 12 17.2692381408 +13 12 18.688208724 12.58 12.11 11.18     ~ 378 2
18 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2365 3
19 NGC 4261 LIN 12 19 23.2160630 +05 49 29.700024   13.92 12.87     ~ 1227 0
20 NGC 4278 LIN 12 20 06.8242 +29 16 50.722 11.54 11.09 10.16     ~ 947 2
21 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1767 2
22 M 49 Sy2 12 29 46.8 +08 00 01   13.21 12.17     ~ 2097 2
23 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7221 3
24 M 89 LIN 12 35 39.80733343 +12 33 22.8308657 11.29 10.73 9.75     ~ 998 2
25 NGC 4589 LIN 12 37 24.9875 +74 11 30.903   12.0       ~ 286 1
26 NGC 4636 LIN 12 42 49.8333280080 +02 41 15.951929028   12.62 11.84     ~ 1119 1
27 M 60 GiP 12 43 39.9680 +11 33 09.696   10.3       ~ 1349 1
28 NGC 4696 BiC 12 48 49.2724775784 -41 18 39.304053252   11.21   10.7   ~ 491 3
29 NAME Centaurus A Sy2 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4492 3
30 IC 4296 rG 13 36 39.03253319 -33 57 57.0730368   11.52 12.99 10.00 10.79 ~ 495 2
31 NGC 5322 SyG 13 49 15.24 +60 11 25.8   11.3       ~ 415 2
32 3C 293.0 BLL 13 52 17.8719816576 +31 26 46.487381604   16.10 15.10     ~ 473 3
33 NGC 5419 BiC 14 03 38.7225244848 -33 58 41.881842120   11.77 11.33 10.21 14.44 ~ 198 2
34 NGC 5532 LIN 14 16 52.9532 +10 48 26.618   13.3 12.59     ~ 348 3
35 NGC 5846 BiC 15 06 29.253 +01 36 20.29   11.9   9.74   ~ 853 1
36 M 102 SyG 15 06 29.561 +55 45 47.91 11.12 10.74 9.89     ~ 553 3
37 UGC 9799 Sy2 15 16 44.4893939136 +07 01 17.825410740   15.19 14.17     ~ 447 3
38 NGC 6166 Sy2 16 28 38.24470063 +39 33 04.2335319   12.78 11.78     ~ 763 5
39 3C 346.0 BLL 16 43 48.605 +17 15 49.43   17.2       ~ 265 0
40 NAME Hercules A rG 16 51 07.9886687784 +04 59 35.547131472     18.25     ~ 467 1
41 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14463 0
42 2MASX J21555232+3800285 SyG 21 55 52.324 +38 00 28.51   19.20       ~ 228 1
43 NGC 7236 LIN 22 14 44.9886363216 +13 50 47.450963760   14.3 14.3     ~ 275 2
44 UGC 12064 AGN 22 31 20.5885689288 +39 21 29.593072404   14.6       ~ 437 1
45 IC 1459 AGN 22 57 10.60682195 -36 27 43.9966421   10.96 11.85 9.34 10.3 ~ 626 2
46 NGC 7720 Sy1 23 38 29.38324020 +27 01 53.2580084   13.9 13.3     ~ 542 4

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