2004A&A...414..123S


Query : 2004A&A...414..123S

2004A&A...414..123S - Astronomy and Astrophysics, volume 414, 123-139 (2004/1-4)

Mid-infrared emission of galactic nuclei. TIMMI2 versus ISO observations and models.

SIEBENMORGEN R., KRUEGEL E. and SPOON H.W.W.

Abstract (from CDS):

We investigate the mid-infrared radiation of galaxies that are powered by a starburst or by an AGN. For this end, we compare the spectra obtained at different spatial scales in a sample of infrared bright galaxies. ISO observations which include emission of the nucleus as well as most of the host galaxy are compared with TIMMI2 spectra of the nuclear region. We find that ISO spectra are generally dominated by strong PAH bands. However, this is no longer true when inspecting the mid-infrared emission of the pure nucleus. Here PAH emission is detected in starbursts whereas it is significantly reduced or completely absent in AGNs. A physical explanation of these new observational results is presented by examining the temperature fluctuation of a PAH after interaction with a photon. It turns out that the hardness of the radiation field is a key parameter for quantifying the photo-destruction of small grains. Our theoretical study predicts PAH evaporation in soft X-ray environments. Radiative transfer calculations of clumpy starbursts and AGN corroborate the observational fact that PAH emission is connected to starburst activity whereas PAHs are destroyed near an AGN. The radiative transfer models predict for starbursts a much larger mid-infrared size than for AGN. This is confirmed by our TIMMI2 acquisition images: We find that the mid-infrared emission of Seyferts is dominated by a compact core while most of the starbursts are spatially resolved.

Abstract Copyright:

Journal keyword(s): infrared: galaxies - galaxies: ISM - galaxies: nuclei - galaxies: dust

Simbad objects: 28

goto Full paper

goto View the references in ADS

Number of rows : 28
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 * iot Cet * 00 19 25.6743948847 -08 49 26.108975369 5.94 4.77 3.55 2.70 2.11 K1+IIICN0.5 180 0
2 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4565 2
3 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1786 2
4 NGC 1386 Sy1 03 36 46.238 -35 59 57.39 12.42 12.16 11.23 10.76   ~ 517 1
5 * eps Lep PM* 05 05 27.6644072506 -22 22 15.724153311 6.41 4.64 3.18 2.08 1.27 K4III 156 0
6 NGC 1797 Sy1 05 07 44.883 -08 01 08.57   14.42   13.22   ~ 91 0
7 LEDA 17155 Sy2 05 21 01.3994605776 -25 21 45.321827832   15.47 14.75     ~ 497 0
8 2MASX J08010650-6609147 H2G 08 01 06.6345994848 -66 09 14.878938132   16.18       ~ 21 0
9 * 28 Hya * 09 25 24.0350848224 -05 07 02.622641052   7.082 5.579     K4/5III 50 0
10 NGC 2966 GiP 09 42 11.5147585416 +04 40 23.485202148   14.0       ~ 113 0
11 NGC 3256 Sy2 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 836 2
12 NGC 4123 AGN 12 08 11.1187718376 +02 52 41.781736956   13.1       ~ 339 2
13 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1332 2
14 NAME Centaurus A Sy2 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4455 3
15 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2546 2
16 ESO 445-50 Sy1 13 49 19.2601801224 -30 18 34.213815504   13.81 13.66 12.18 12.35 ~ 801 0
17 * tet Cen PM* 14 06 40.94752 -36 22 11.8371 3.94 3.04 2.05 1.29 0.76 K0-IIIb 252 1
18 NAME Circinus Galaxy Sy2 14 13 09.906 -65 20 20.47   10.89 9.84 10.6 10.0 ~ 1203 2
19 NGC 5506 Sy2 14 13 14.8761010056 -03 12 27.556909272   15.25 14.38     ~ 1089 0
20 NGC 5643 Sy2 14 32 40.778 -44 10 28.60   11.03 13.60 9.92 10.6 ~ 565 0
21 * nu. Lib * 15 06 37.5965113128 -16 15 24.546990276 8.70 6.78 5.20     K5-III 95 0
22 NGC 6000 Sy2 15 49 49.556 -29 23 12.50   13.02   11.27 12.0 ~ 112 1
23 NGC 6240 Sy2 16 52 58.9 +02 24 03   14.31 13.37     ~ 1632 2
24 * lam Sgr PM* 18 27 58.2407185 -25 25 18.114589 4.75 3.85 2.81 2.06 1.50 K1IIIb 276 0
25 * bet CrA * 19 10 01.7558032 -39 20 26.864359   5.281 4.095     K0II/IIICNIb 59 0
26 * alf Ind PM* 20 37 34.0320077 -47 17 29.402601 4.90 4.11 3.11     K0III-IV 132 0
27 Mrk 509 Sy1 20 44 09.7504483224 -10 43 24.727155528   13.35 13.12 10.7   ~ 1269 0
28 NGC 7552 Sy1 23 16 10.7 -42 35 05 11.34 11.22 10.57 10.08 11.1 ~ 549 3

To bookmark this query, right click on this link: simbad:objects in 2004A&A...414..123S and select 'bookmark this link' or equivalent in the popup menu