J/A+A/678/A206 Ionized clouds in central arcsecond of NGC 1068 (Vermot+, 2023)
Ionized clouds in the central arcsecond of NGC 1068:
YJHK spatially resolved spectroscopy.
Vermot P., Barna B., Ehlerova S., Morris M., Palous J., Wunsch R.
<Astron. Astrophys. 678, A206 (2023)>
=2023A&A...678A.206V 2023A&A...678A.206V (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Interstellar medium ; Spectra, infrared
Keywords: galaxies: individual: NGC 1068 - galaxies: active -
galaxies: nuclei - ISM: clouds - infrared: ISM
Abstract:
Several bright emission line regions are observed in the central 100
parsecs of the active galaxy NGC 1068.
We aim to determine the properties and ionization mechanism of three
regions: the nucleus itself (B), and two clouds located 0.3" and 0.7"
North of it (C and D).
We have combined SPHERE (0.95-1.65um) and SINFONI (1.5-2.45um)
spectra for the three regions B, C and D. We compare these spectra to
several CLOUDY photoionization models and to the MAPPINGS III Library
of Fast Radiative Shock Models.
The emission line spectra of the three regions are almost identical to
each other, and contribute to most of the emission line flux in the
nuclear region. The emitting media contain multiple phases, the most
luminous of which have temperatures ranging from 104.8K to 106K.
Central photoionization models can reproduce some features of the
spectra, but the fast radiative shock model provides the best fit to
the data.
The similarity between the three regions indicates that they belong to
the same class of objects. Based on our comparisons, we conclude that
they are shock regions located where the AGN jet impacts massive
molecular clouds.
Description:
We used a new observation performed with SPHERE in the IRDIS long-slit
spectroscopy (LSS) mode as part of the 0104.B-0242(A) ESO observing
program (PI: J.-L. Beuzit).
We used archival SINFONI integral field spectroscopy obtained as part
of the observing program 076.B-0098(A). The instrumental setup
provides spectrally dispersed images in the H and K bands with R∼1500
and r=100mas.
The combination of SPHERE and SINFONI data enabled us to produce a
comprehensive YJHK spectrum for three emission line regions named B,
C, and D in the central arcsecond of NGC 1068. Our analysis reveals
that these regions exhibit similar emission line spectra, suggesting
that they belong to the same class of objects. The various modeling
techniques utilized in this study produced consistent results for all
three objects.
Objects:
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RA (2000) DE Designation(s)
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02 42 40.70 +00 00 47.8 NGC 1068 = M 77
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
spb.dat 26 1692 Cloud B spectrum
spc.dat 26 1692 Cloud C spectrum
spd.dat 26 1691 Cloud D spectrum
table1.dat 53 25 Summary of emission lines
tablee1.dat 39 14 Cloud B: Comparison between the observation
and the best SHK model
tablee2.dat 39 24 Cloud C: Comparison between the observation
and the best SHK model
tablee3.dat 39 24 Cloud D: Comparison between the observation
and the best SHK model
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See also:
J/ApJ/591/138 : Chandra X-ray sources of NGC 1068 (Smith+, 2003)
J/A+A/602/A78 : NGC1068 interferometric mid-IR measurements
(Lopez-Gonzaga+, 2017)
J/A+A/613/A3 : NGC 1068 deep millimeter spectroscopy observations
(Qiu+, 2018)
J/A+A/625/A100 : NGC 1068 SPHERE-VLT images (Rouan+, 2019)
J/A+A/634/A1 : NGC 1068 GRAVITY reconstructed image (GRAVITY+, 2020)
J/A+A/634/A125 : NGC 1068 nucleus molecular line spectra at 2mm (Qiu+, 2020)
J/A+A/660/A83 : NGC1068 I-HCN(1-0) and I-HCO+(1-0) maps
(Sanchez-Garcia+, 2022)
Byte-by-byte Description of file: spb.dat spc.dat spd.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 E12.6 m lambda Wavelength
14- 26 E13.6 W/m2/um Flux Flux
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Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Line Line identification
12- 17 F6.1 nm lambda Rest wavelength
19- 23 F5.1 eV E Ionization energy
25- 29 F5.1 19-18W/m2 FluxB ? Cloud B measured flux
31- 33 F3.1 19-18W/m2 e_FluxB ? Cloud B measured flux error
35- 39 F5.1 19-18W/m2 FluxC Cloud C measured flux
41- 43 F3.1 19-18W/m2 e_FluxC Cloud C measured flux error
45- 49 F5.1 19-18W/m2 FluxD Cloud D measured flux
51- 53 F3.1 19-18W/m2 e_FluxD Cloud D measured flux error
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Byte-by-byte Description of file: tablee1.dat tablee2.dat tablee3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Line Line Identification
12- 17 F6.1 nm lambda Rest Wavelength
19- 23 F5.1 eV E Ionization Energy
25- 29 F5.1 10-18W/m2 Flux Measured flux
31- 33 F3.1 10-18W/m2 e_Flux Measured flux error
35- 39 F5.1 10-18W/m2 FluxMod ?=- Model flux
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Acknowledgements:
Pierre Vermot, pierre.vermot(at)asu.cas.cz
(End) Patricia Vannier [CDS] 21-Aug-2023