J/A+A/693/A36 Arp 220 circumnuclear region JWST/NIRSpec data (Ulivi+, 2025)
JWST/NIRSpec insights into the circumnuclear region of Arp 220:
A detailed kinematic study.
Ulivi L., Perna M., Lamperti I., Arribas S., Cresci G., Marconcini C.,
Rodriguez Del Pino B., Boeker T., Bunker A.J., Ceci M., Charlot S.,
D'Eugenio F., Fahrion K., Maiolino R., Marconi A., Pereira-Santaella M.
<Astron. Astrophys. 693, A36 (2025)>
=2025A&A...693A..36U 2025A&A...693A..36U (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Infrared sources ; Spectroscopy
Keywords: ISM: bubbles - ISM: jets and outflows - ISM: kinematics and dynamics -
galaxies: individual: Arp 220 - infrared: galaxies
Abstract:
The study of starburst and active galactic nuclei (AGN) feedback is
crucial for understanding the regulation of star formation and the
evolution of galaxies across cosmic time. Arp 220, the closest
ultraluminous infrared galaxy (ULIRG), is in an advanced phase of a
major merger with two distinct nuclei, and it shows evidence of
multiphase (molecular, ionized, and neutral) and multiscale
(from <0.1 to >5kpc) outflows. Therefore, it represents an ideal
system for investigating outflow mechanisms and feedback phenomena in
detail. Using new JWST NIRSpec IFU observations, we investigated the
spatially resolved gaseous (in both ionized and hot molecular phases)
and stellar kinematics in the innermost 1kpc. We decoupled the
different gas kinematic components through multi-Gaussian fitting,
identifying two multiphase outflows, each associated with one nucleus,
with velocities up to ∼1000km/s. We also resolved two counter-rotating
discs around each nucleus embedded in a larger-scale rotational disk.
We compute the total (including ionized, cold, and hot molecular)
outflow mass (~=107M☉), the mass rate (~=15M☉/yr), and
the energetics ( dEout/dt~=1042erg/s) for each nucleus, and we
found that the ionized and hot molecular outflowing gas contribute
around 2-30% of the total mass and the energy of the outflows, as
inferred from the combination of multiwavelength information. We
discuss the possible origin of the outflows, finding no compelling
evidence to prefer a starburst- or AGN-driven scenario. Regardless of
their nature, outflows in Arp 220 propagate in multiple directions from
parsec to kiloparsec scales, potentially impacting a significant
portion of the host galaxy. This contrasts with isolated systems where
outflows typically follow a more collimated path or are limited to the
central region of the galaxy and hence do not affect the interstellar
medium throughout the entire galaxy. This study highlights the
importance of investigating merging systems with multiwavelength
facilities, including JWST NIRSpec IFU, to obtain a comprehensive
understanding of feedback mechanisms in galaxy evolution.
Description:
We provide the data cube after the subtraction of the "wiggles",
the spectra in Fig.2, and the moment maps of the ionized gas
(Paschenα and [FeII]) and hot molecular gas (H2_2.122).
140h-f100lpcgss3d-2_corrwigg.fits and
235h-f170lpcgss3d-2_corrwigg.fits are the cubes after the
subtraction of the wiggles. Enucleuscube1.fits,
Enucleuscube2.fits, Wnucleuscube1.fits, Wnucleuscube2.fits
represent the integrated spectra taken from the E nucleus and W
nucleus from the two cubes in the observed frame. The other images
represent the three moments of the three transitions.
Objects:
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RA (2000) DE Designation(s)
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15 34 57.224 +23 30 11.515 Arp 220 West Nucleus
15 34 57.294 +23 30 11.353 Arp 220 East Nucleus
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 179 15 List of fits datacubes and spectra
fits/* . 15 Individual fits files
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See also:
J/ApJ/799/10 : Arp 220 6 and 33GHz images (Barcos-Munoz+, 2015)
J/A+A/590/A25 : Arp 220 HCN and HCO+ data cubes (Martin+, 2016)
J/A+A/593/A86 : Arp 220 LOFAR radio images at 150MHz (Varenius+, 2016)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 22 I3 --- Nx Number of pixels along X-axis
24- 27 I4 --- Ny Number of pixels along Y-axis
29- 32 I4 --- Nz ? Number of pixels along Z-axis
34- 41 F8.6 01.nm blambda ? Lower value of wavelength interval
43- 49 F7.5 01.nm Blambda ? Upper value of wavelength interval
51- 58 F8.6 01.nm dlambda ? Wavelength resolution
60- 65 I6 Kibyte size Size of FITS file
67-101 A35 --- FileName Name of FITS file, in subdirectory fits
103-179 A77 --- Title Title of the FITS file
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Acknowledgements:
Lorenzo Ulivi, Lorenzo.ulivi1(at)unifi.it, lorenzo.ulivi(at)unitn.it,
lorenzo.ulivi(at)inaf.it
(End) Patricia Vannier [CDS] 21-Nov-2024