2009A&A...505..589G


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.14CET18:46:02

2009A&A...505..589G - Astronomy and Astrophysics, volume 505, 589-600 (2009/10-2)

AGN/starburst connection in action: the half million second RGS spectrum of NGC 1365.

GUAINAZZI M., RISALITI G., NUCITA A., WANG J., BIANCHI S., SORIA R. and ZEZAS A.

Abstract (from CDS):

High-resolution X-ray observations in the imaging and spectral domain have recently opened a new window on active galactic nuclei (AGN) feedback onto the circumnuclear gas. Spectral diagnostics, as well as the remarkable morphological coincidence between [OIII] and X-rays, point to AGN photoionisation as the dominant ionisation mechanism on scales as large as a few kpc. In this paper we extend these studies to the nearby Seyfert 2 galaxy NGC 1365, known to host a circumnuclear ring of intense star formation at ≃1.3kpc from the nucleus. The main scope of this investigation is to study the connection between nuclear activity and star formation in nearby AGN. We present a deep (≃5.8days) 0.3-2keV high-resolution spectrum of NGC 1365, collected with the reflection grating spectrometer (RGS) on board XMM-Newton. The spectrum is dominated by strong recombination lines of He- and H-like transitions from carbon to silicon, as well as by L transitions from FeXVII. The continuum is strong, especially in the 10 to 20Å range. Formal fits require two optically thin, collisionally ionised plasma components, with temperatures ≃300 and ≃640eV. However, they leave the bulk of the forbidden components of the He-α OVII and NVI triplets unaccounted for. These features can be explained as being produced by photoionised gas. NGC 1365 is therefore the first obscured AGN, whose high-resolution X-ray spectrum requires both collisional ionisation and photoionisation. The relative weakness of photoionisation does not stem from the intrinsic weakness of its AGN, whose X-ray luminosity is ∼1042erg/s. We suggest that it may instead come from the line-of-sight from the active nucleus to the NLR being blocked by optically thick matter in the broad line region, at the same time responsible for the large observed variation of the column density obscuring the X-ray active nucleus. Alternatively, NGC 1365 could host a remarkably luminous nuclear starburst when compared to the AGN accretion power.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: Seyfert - galaxies: starburst - X-rays: galaxies - X-rays: individuals: NGC 1365

Simbad objects: 10

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Number of rows : 10

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 Mrk 573 Sy2 01 43 57.7763654544 +02 20 59.525472345   14.90 14.07     ~ 469 0
2 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 3991 2
3 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1477 2
4 Mrk 3 Sy2 06 15 36.458 +71 02 15.24 14.21 14.03 12.97     ~ 828 3
5 NGC 4151 Sy1 12 10 32.5771747733 +39 24 21.057727323   12.18 11.48     ~ 3308 2
6 M 61 Sy2 12 21 54.9275149050 +04 28 25.588335799 10.07 10.18 9.65     ~ 853 2
7 NAME Circinus Galaxy Sy2 14 13 09.906 -65 20 20.47   10.89 9.84 10.6 10.0 ~ 969 2
8 NGC 5506 AGN 14 13 14.901 -03 12 27.22   15.25 14.38     ~ 971 0
9 NGC 7469 Sy1 23 03 15.674 +08 52 25.28 12.60 13.00 12.34     ~ 1845 3
10 NGC 7582 GiP 23 18 23.621 -42 22 14.06 11.62 10.92 10.62     ~ 777 2

    Equat.    Gal    SGal    Ecl

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2019.11.14-18:46:02

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