2011MNRAS.414.2309O

Query : 2011MNRAS.414.2309O

2011MNRAS.414.2309O - Mon. Not. R. Astron. Soc., 414, 2309-2336 (2011/July-1)

Far-ultraviolet emission in the A2597 and A2204 brightest cluster galaxies.

OONK J.B.R., HATCH N.A., JAFFE W., BREMER M.N. and VAN WEEREN R.J.

Abstract (from CDS):

We use the Hubble Space Telescope Advanced Camera for Surveys (ACS)/Solar Blind Channel (SBC) and Very Large Telescope (VLT) Focal Reducer/low dispersion Spectrograph (FORS) cameras to observe the brightest cluster galaxies (BCGs) in Abell 2597 and Abell 2204 in the far-ultraviolet (FUV) F150LP and optical U, B, V, R, I Bessel filters.

The FUV and U-band emission is enhanced in bright, filamentary structures surrounding the BCG nuclei. These filaments can be traced out to 20 kpc from the nuclei in the FUV. Excess FUV and U-band light is determined by removing emission due to the underlying old stellar population and mapped with 1-arcsec spatial resolution over the central 20-kpc regions of both galaxies.

We find the FUV and U excess emission to be spatially coincident, and a stellar interpretation requires the existence of a significant amount of 10 000–50 000 K stars. Correcting for nebular continuum emission and dust intrinsic to the BCG further increases the FUV to U-band emission ratio and implies that stars alone may not suffice to explain the observations. However, lack of detailed information on the gas and dust distribution and extinction law in these systems prevents us from ruling out a purely stellar origin.

Non-stellar processes, such as the central active galactic nucleus, scattering, synchrotron and Bremsstrahlung emission are investigated and found to not be able to explain the FUV and U-band measurements in A2597. Contributions from non-thermal processes not treated here should be investigated.

Comparing the FUV emission to the optical Hα line emitting nebula shows good agreement on kpc-scales in both A2597 and A2204. In concordance with an earlier investigation by [O'Dea et al. (2004)], we find that O stars can account for the ionizing photons necessary to explain the observed Hα line emission.


Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): galaxies: clusters: individual: Abell 2204 - galaxies: clusters: individual: Abell 2597 - ultraviolet: ISM

Nomenclature: Table A1: [OHJ2011] A2597 NN (Nos 0-26). Table A2: [OHJ2011] A2204 NN (Nos 0-26).

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 31

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Number of rows : 31
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ACO 85 ClG 00 41 36.21 -09 19 30.4           ~ 974 0
2 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
3 NGC 604 HII 01 34 32.1 +30 47 01           ~ 608 0
4 ACO 3112 ClG 03 17 52.9 -44 15 06           ~ 329 1
5 ACO 426 ClG 03 19 47.6 +41 30 54           ~ 2508 1
6 NGC 1275 Bla 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4243 3
7 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
8 ZwCl 0839+2937 ClG 08 42 55.9 +29 27 26     17.0     ~ 93 0
9 ACO 780 ClG 09 18 30 -12 15.7           ~ 469 0
10 ZwCl 1021+0426 ClG 10 23 39.0 +04 11 14   15.6 17.95     ~ 297 0
11 ACO 1204 ClG 11 13 32.2 +17 35 40           ~ 101 0
12 NAME NGC 4073 Group GrG 12 04 44.08 +01 48 40.9     13.53     ~ 292 0
13 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
14 ClG J1347-1145 ClG 13 47 30.5 -11 45 07           ~ 577 0
15 ZwCl 1358+6245 ClG 13 59 54.3 +62 30 36     18.5     ~ 370 0
16 ZwCl 1455+2232 ClG 14 57 15.2 +22 20 30     18.62 20.04   ~ 309 0
17 ACO 2029 ClG 15 10 54.2 +05 44 23           ~ 1020 0
18 ACO 2052 ClG 15 16 41.64 +07 01 45.5           ~ 756 1
19 ACT-CL J1521.8+0742 ClG 15 21 48.8 +07 43 41     15.13     ~ 326 0
20 ACO 2142 ClG 15 58 26.5 +27 13 52           ~ 825 0
21 LEDA 1285667 AGN 16 32 46.8 +05 34 32           ~ 5 0
22 NVSS J163246+053434 Rad 16 32 46.9 +05 34 33   16.6       ~ 12 1
23 2MASX J16324698+0534410 BiC 16 32 46.9539251088 +05 34 40.802108700   18.59   17.20   ~ 4 0
24 ACO 2204 ClG 16 32 47.7 +05 34 18           ~ 457 0
25 BAX 252.7839+04.9926 ClG 16 51 08.2 +04 59 34           ~ 50 0
26 ACO 2597 ClG 23 25 19.70 -12 07 27.7           ~ 572 0
27 LEDA 71390 Sy1 23 25 19.72968960 -12 07 27.0814800   15.45 15.46     ~ 185 2
28 MCG-06-01-008 QSO 23 57 00.7406438328 -34 45 32.994968292   13.89 13.26 12.19   ~ 131 2
29 [DMS93] NGC 604 227 * ~ ~           O6V 3 0
30 [DMS93] NGC 604 239 * ~ ~           O7V 3 0
31 [DMS93] NGC 604 237 * ~ ~           O8V 3 0

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