2004A&A...427...35P


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.16CET23:34:04

2004A&A...427...35P - Astronomy and Astrophysics, volume 427, 35-44 (2004/11-3)

The composite starburst/AGN nature of the superwind galaxy NGC 4666.

PERSIC M., CAPPI M., REPHAELI Y., BASSANI L., DELLA CECA R., FRANCESCHINI A., HUNT L., MALAGUTI G. and PALAZZI E.

Abstract (from CDS):

We report the discovery of a Compton-thick AGN and of intense star-formation activity in the nucleus and disk, respectively, of the nearly edge-on superwind galaxy NGC 4666. Spatially unresolved emission is detected by BeppoSAX only at energies <10keV, whereas spatially resolved emission from the whole disk is detected by XMM-Newton. A prominent (EW∼1-2keV) emission line at ∼6.4keV is detected by both instruments. From the XMM-Newton data alone the line is spectrally localized at E≃6.42 ±0.03keV, and seems to be spatially concentrated in the nuclear region of NGC 4666. This, together with the presence of a flat (Γ∼1.3) continuum in the nuclear region, suggests the existence of a strongly absorbed (i.e., Compton-thick) AGN, whose intrinsic 2-10keV luminosity is estimated to be L2–10>2x1041erg/s. At energies ≲1keV the integrated (BeppoSAX) spectrum is dominated by a ∼0.25keV thermal gas component distributed throughout the disk (resolved by XMM-Newton). At energies ∼2-10keV, the integrated spectrum is dominated by a steep (Γ>2) power-law (PL) component. The latter emission is likely due to unresolved sources with luminosity L∼1038-1039erg/s that are most likely accreting binaries (with BH masses ≤8M). Such binaries, which are known to dominate the X-ray point-source luminosity in nearby star-forming galaxies, have Γ∼2PL spectra in the relevant energy range. A Γ∼1.8PL contribution from Compton scattering of (the radio-emitting) relativistic electrons by the ambient FIR photons may add a truly diffuse component to the 2-10keV emission.

Abstract Copyright:

Journal keyword(s): X-rays: galaxies - galaxies: starburst - galaxies: Seyfert - galaxies: individual: NGC 4666

Simbad objects: 9

goto Full paper

goto View the reference in ADS

Number of rows : 9

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 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2864 2
2 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5222 6
3 NAME NGC 3690 West GiP 11 28 30.69 +58 33 33.4   11.8       ~ 604 4
4 UGC 6472 C G 11 28 30.70 +58 33 48.4           ~ 351 0
5 NGC 3690 IG 11 28 31.326 +58 33 41.80   13.19 12.86     ~ 867 4
6 NAME NGC 3690 East AGN 11 28 33.07 +58 33 54.2   11.8       ~ 609 4
7 NGC 4666 GiP 12 45 08.676 -00 27 42.88   11.7   11.5 10.7 ~ 316 1
8 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1231 2
9 NGC 6240 Sy2 16 52 58.861 +02 24 03.55   14.31 13.37     ~ 1447 2

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2004A&A...427...35P and select 'bookmark this link' or equivalent in the popup menu


2019.11.16-23:34:04

© Université de Strasbourg/CNRS

    • Contact