2017ApJ...851...66H

Query : 2017ApJ...851...66H

2017ApJ...851...66H - Astrophys. J., 851, 66-66 (2017/December-2)

The onset of thermally unstable cooling from the hot atmospheres of giant galaxies in clusters: constraints on feedback models.

HOGAN M.T., McNAMARA B.R., PULIDO F.A., NULSEN P.E.J., VANTYGHEM A.N., RUSSELL H.R., EDGE A.C., BABYK I., MAIN R.A. and McDONALD M.

Abstract (from CDS):

We present accurate mass and thermodynamic profiles for 57 galaxy clusters observed with the Chandra X-ray Observatory. We investigate the effects of local gravitational acceleration in central cluster galaxies, and explore the role of the local free-fall time (tff) in thermally unstable cooling. We find that the radially averaged cooling time (tcool) is as effective an indicator of cold gas, traced through its nebular emission, as the ratio tcool/tff. Therefore, tcool primarily governs the onset of thermally unstable cooling in hot atmospheres. The location of the minimum tcool/tff, a thermodynamic parameter that many simulations suggest is key in driving thermal instability, is unresolved in most systems. Consequently, selection effects bias the value and reduce the observed range in measured tcool/tff minima. The entropy profiles of cool-core clusters are characterized by broken power laws down to our resolution limit, with no indication of isentropic cores. We show, for the first time, that mass isothermality and the K∝r2/3 entropy profile slope imply a floor in tcool/tff profiles within central galaxies. No significant departures of tcool/tff below 10 are found. This is inconsistent with models that assume thermally unstable cooling ensues from linear perturbations at or near this threshold. We find that the inner cooling times of cluster atmospheres are resilient to active galactic nucleus (AGN)-driven change, suggesting gentle coupling between radio jets and atmospheric gas. Our analysis is consistent with models in which nonlinear perturbations, perhaps seeded by AGN-driven uplift of partially cooled material, lead to cold gas condensation.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: active - galaxies: clusters: general - galaxies: clusters: intracluster medium - galaxies: elliptical and lenticular, cD - galaxies: kinematics and dynamics - X-rays: galaxies: clusters - X-rays: galaxies: clusters

Simbad objects: 68

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Number of rows : 68
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 ACO 85 ClG 00 41 36.21 -09 19 30.4           ~ 909 0
2 ACO 115 ClG 00 55 59.5 +26 19 14           ~ 270 1
3 ACO 119 ClG 00 56 08.57 -01 12 00.8           ~ 555 2
4 ACO 133 ClG 01 02 41.5 -21 52 53           ~ 368 1
5 ACO 160 ClG 01 12 59.98 +15 30 05.3           ~ 172 0
6 ACO 399 ClG 02 57 56.4 +13 00 59           ~ 396 0
7 ACO 401 ClG 02 58 56.9 +13 34 56           ~ 566 0
8 ACO 3112 ClG 03 17 52.4 -44 14 35           ~ 311 1
9 ZwCl 0335+0956 ClG 03 38 35.3 +09 57 54           ~ 383 1
10 ACO 3158 ClG 03 42 39.6 -53 37 50           ~ 304 0
11 ACO 478 ClG 04 13 20.7 +10 28 35           ~ 502 0
12 ACO 496 ClG 04 33 38.8 -13 15 59           ~ 694 2
13 ACO 520 ClG 04 54 10.1 +02 55 38           ~ 436 0
14 ACO 3376 ClG 06 01 25.000 -39 59 51.00           ~ 305 0
15 ClG 0657-56 ClG 06 58 29.6 -55 56 39           ~ 963 1
16 ACO 576 ClG 07 21 24.1 +55 44 20           ~ 297 1
17 ZwCl 0735+7421 ClG 07 41 40.3 +74 14 58     17.70     ~ 254 0
18 2MASX J07473129-1917403 BiC 07 47 31.3247085936 -19 17 40.013334276   19.60       ~ 409 1
19 RX J0821.0+0752 ClG 08 21 02.4 +07 51 47           ~ 62 1
20 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 437 0
21 ICRF J083454.9+553421 Sy2 08 34 54.90398776 +55 34 21.0703409   20.75 19.45 17.180   ~ 282 2
22 ACO 744 ClG 09 07 20.0 +16 39 25           ~ 79 0
23 ACO 754 ClG 09 09 08.4 -09 39 58           ~ 666 1
24 NAME Hya A LIN 09 18 05.66848602 -12 05 43.8060823   14.38 14.8     ~ 1012 1
25 ACO 780 ClG 09 18 30 -12 15.7           ~ 453 0
26 ZwCl 0949+5207 ClG 09 52 49.1 +51 53 05           ~ 135 0
27 ACO 970 ClG 10 17 34.3 -10 42 01           ~ 85 0
28 ACO 1201 ClG 11 12 54.4 +13 26 08           ~ 115 1
29 ACO 1413 ClG 11 55 12.87 +23 23 46.9           ~ 430 0
30 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7193 3
31 ACO 1644 ClG 12 57 11.6 -17 24 34           ~ 366 1
32 ACO 1650 ClG 12 58 42.0 -01 45 45           ~ 304 0
33 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1125 0
34 NGC 5098 BiC 13 20 14.7283808160 +33 08 36.294146268   15.0       ~ 107 2
35 ACO 1758 ClG 13 32 32.1 +50 30 37           ~ 251 2
36 ACO 3571 ClG 13 47 28.9 -32 51 57           ~ 284 2
37 ClG J1347-1145 ClG 13 47 30.5 -11 45 07           ~ 548 0
38 ACO 1795 ClG 13 48 50.48 +26 35 07.4           ~ 1267 0
39 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 688 1
40 ACO 1837 ClG 14 01 36.2 -11 07 48           ~ 104 0
41 ClG J1423+2404 ClG 14 23 47.7 +24 04 40           ~ 209 0
42 ACO 1991 ClG 14 54 41.53 +18 38 08.4           ~ 330 1
43 ZwCl 1455+2232 ClG 14 57 15.2 +22 20 30     18.62 20.04   ~ 294 0
44 ACO 2034 ClG 15 10 12.96 +33 29 53.2           ~ 215 1
45 ACO 2029 ClG 15 10 56.2 +05 44 42           ~ 943 0
46 ACO 2052 ClG 15 16 41.64 +07 01 45.5           ~ 730 1
47 ACO 2069 ClG 15 24 02.92 +29 53 20.3           ~ 143 0
48 ClG J1532+3021 ClG 15 32 53.8 +30 21 00           ~ 113 0
49 ACO 2107 ClG 15 39 39.04 +21 46 57.8           ~ 253 0
50 ACO 2146 ClG 15 56 04.7 +66 20 24           ~ 176 0
51 ACO 2142 ClG 15 58 14.38 +27 12 57.8           ~ 768 0
52 ACO 2199 ClG 16 28 43.31 +39 34 07.6           ~ 1171 1
53 ACO 2204 ClG 16 32 45.7 +05 34 43           ~ 436 0
54 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 359 0
55 NAME Hercules A rG 16 51 07.9886687784 +04 59 35.547131472     18.25     ~ 465 1
56 ACO 2244 ClG 17 02 40.33 +34 02 58.7           ~ 281 0
57 IC 1262 BiC 17 33 02.0176600056 +43 45 34.803150516   14.9       ~ 73 0
58 ZwCl 1742+3306 ClG 17 44 16.2753 +32 59 55.115           ~ 80 0
59 ACO 2319 ClG 19 20 45.3 +43 57 43           ~ 461 1
60 NAME Cyg A Sy2 19 59 28.35656837 +40 44 02.0972325   16.22 15.10     ~ 2367 2
61 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 627 1
62 ACO 2390 ClG 21 53 37.4 +17 41 46           ~ 688 2
63 ACO S 1101 ClG 23 13 58.5 -42 43 39           ~ 258 1
64 ACO 2589 ClG 23 24 00.5 +16 49 29           ~ 316 1
65 ACO 2597 ClG 23 25 19.70 -12 07 27.7           ~ 539 0
66 ACO 2626 ClG 23 36 31.0 +21 09 36           ~ 247 0
67 ACO 2634 ClG 23 38 18.4 +27 01 37           ~ 503 2
68 ACO 4059 ClG 23 57 02.2 -34 45 58           ~ 380 1

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