2006A&A...448..853G


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.21CET21:35:03

2006A&A...448..853G - Astronomy and Astrophysics, volume 448, 853-860 (2006/3-4)

Multifrequency VLA radio observations of the X-ray cavity cluster of galaxies RBS797: evidence of differently oriented jets.

GITTI M., FERETTI L. and SCHINDLER S.

Abstract (from CDS):

We report on the peculiar activity of the radio source located at the center of the cooling flow cluster RBS797 (z=0.35), the first distant cluster in which two pronounced X-ray cavities have been discovered. Our new multifrequency (1.4, 4.8, and 8.4GHz) observations obtained with the Very Large Array clearly reveal the presence of radio emission on three different scales showing orientation in different directions, all of which indicates that RBS797 represents a very peculiar case. The lowest resolution images show large-scale radio emission characterized by amorphous morphology and a steep spectrum, extended on a scale of hundreds of kpc. On a scale of tens of kpc, there is evidence of 1.4GHz radio emission elongated in the northeast-southwest direction exactly towards the holes detected in X-rays. The highest resolution image shows the details of the innermost 4.8GHz radio jets on a kpc scale; they are remarkably oriented in a direction that is perpendicular to that of the extended structure detected at a lower resolution. We therefore find evidence of a strong interaction between the central radio source and the intra-cluster medium in RBS797. We suggest a scenario in which the 1.4GHz emission filling the X-ray cavities consists of buoyant bubbles of radio emitting plasma that are created by twin jets in the past and whose expansion has displaced the thermal gas that was formerly in the X-ray holes, whereas the two jets visible at 4.8 GHz are related to the present nuclear activity that has restarted at a different position angle from the original outburst that created the outer radio lobes. The total radio luminosity is ∼1042erg/s, corresponding to a factor of a few thousand times less than the estimated cooling luminosity.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual: RBS797 - radio continuum: galaxies - galaxies: active - galaxies: jets - X-rays: galaxies: clusters - galaxies: cooling flows

Simbad objects: 17

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Number of rows : 17

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ACO 262 ClG 01 52 50.4 +36 08 46           ~ 646 1
2 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3489 3
3 ACO 496 ClG 04 33 30.3838 -13 14 21.584           ~ 655 2
4 QSO B0710+439 QSO 07 13 38.16412910 +43 49 17.2071530   20.7       ~ 222 0
5 NAME Hya A LIN 09 18 05.651 -12 05 43.99   14.38 14.8     ~ 889 1
6 ClG J0947+7623 ClG 09 47 12.9 +76 23 13           ~ 127 1
7 6C 103917+811008 QSO 10 44 23.06254789 +80 54 39.4430277     16.5 18.29   ~ 179 1
8 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6079 3
9 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 3927 3
10 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3647 1
11 ACO 2052 ClG 15 16 45.5 +07 00 01           ~ 666 1
12 NAME NGC 5920 Group ClG 15 21 50.7 +07 42 18     15.13     ~ 281 0
13 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1088 1
14 NAME Cyg A Sy2 19 59 28.35645829 +40 44 02.0966496   16.22 15.10     ~ 2076 2
15 ACO 2597 ClG 23 25 19.70 -12 07 27.7           ~ 486 0
16 2E 4728 LIN 23 25 19.731 -12 07 27.51   15.45 15.46     ~ 169 2
17 ACO 4059 ClG 23 56 40.7 -34 40 18           ~ 346 1

    Equat.    Gal    SGal    Ecl

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2020.01.21-21:35:03

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