J/ApJ/942/L36 Star-forming Regions of NGC 7469 (Bohn+, 2023)
GOALS-JWST:
NIRCam and MIRI Imaging of the Circumnuclear Starburst Ring in NGC 7469.
Bohn T., Inami H., Diaz-Santos T., Armus L., Linden S.T., U V., Surace J.,
Larson K.L., Evans A.S., Hoshioka S., Lai T., Song Y., Mazzarella J.M.,
Barcos-Munoz L., Charmandaris V., Howell J.H., Medling A.M., Privon G.C.,
Rich J.A., Stierwalt S., Aalto S., Boker T., Brown M.J.I., Iwasawa K.,
Malkan M.A., van der Werf P.P., Appleton P., Hayward C.C., Kemper F.,
Law D., Marshall J., Murphy E.J., Sanders D.
<Astrophys. J. 942, L36 (2023)>
=2023ApJ...942L..36B 2023ApJ...942L..36B (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, IR ; Star Forming Region ; Photometry, infrared
Keywords: luminous infrared galaxies - infrared astronomy - infrared sources -
star forming regions
Abstract:
We present James Webb Space Telescope (JWST) imaging of NGC 7469 with
the Near-Infrared Camera (NIRCam) and the Mid-InfraRed Instrument
(MIRI). NGC 7469 is a nearby, z=0.016317, luminous infrared galaxy
(LIRG) that hosts both a Seyfert Type-1.5 nucleus and a circumnuclear
starburst ring with a radius of ∼0.5kpc. The new near-infrared (NIR)
JWST imaging reveals 65 star-forming regions, 36 of which were not
detected by HST observations. Nineteen of the 36 sources have very red
NIR colors that indicate obscurations up to Av∼7 and a contribution
of at least 25% from hot dust emission to the 4.4µm band. Their NIR
colors are also consistent with young (<5Myr) stellar populations and
more than half of them are coincident with the MIR emission peaks.
These younger, dusty star-forming regions account for ∼2% and ∼10% of
the total 1.5µm and 4.4µm luminosity of the starburst ring,
respectively. The addition of these young regions confirm the age
bimodality seen in the star-forming regions of the ring. Moreover, we
have increased the number of young sources by a factor of four,
raising the total percentage of the young population to ∼40%. These
results illustrate the effectiveness of JWST in identifying and
characterizing previously hidden star formation in the densest
star-forming environments around AGN.
Description:
We report JWST/NIRCam and JWST/MIRI photometry of star-forming regions
in the starburst ring of NGC 7469. Aperture photometry was performed
on the NIRCam F150W, F200W, F335M, F444W filters, and MIRI F560W,
F770W, F1500W filters. The extraction sizes for the NIRCam images
correspond to the PSF FWHM of the associated filter. For the MIRI
images, the size of PSF FWHM of the F1500W fiter was used for the
extraction size.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 103 74 Source photometry
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- ID Region ID (1)
5- 15 F11.7 deg RAdeg Right Ascension (J2000)
17- 25 F9.7 deg DEdeg Declination (J2000)
27- 30 F4.2 kpc Dist Distance from center
32 I1 --- Class [1/7] Region classification (2)
34- 36 A3 --- Overlap Region overlap
38- 41 F4.2 mJy FluxF150W ? NIRCam F150W (1.501um) filter flux density
43- 46 F4.2 mJy e_FluxF150W ? Error in NIRCam F150W flux density
48- 51 F4.2 mJy FluxF200W ? NIRCam F200W (1.989um) filter flux density
53- 56 F4.2 mJy e_FluxF200W ? Error in NIRCam F200W flux density
58- 61 F4.2 mJy FluxF335M ? NIRCam F335M (3.362um) filter flux density
63- 66 F4.2 mJy e_FluxF335M ? Error in NIRCam F335M flux density
68- 71 F4.2 mJy FluxF444W ? NIRCam F444W (4.408um) filter flux density
73- 77 F5.2 mJy e_FluxF444W ? Error in NIRCam F444W flux density
79- 81 F3.1 mJy FluxF560W ? MIRI F560W (5.6um) filter flux density
83- 85 F3.1 mJy e_FluxF560W ? Error in F560W flux density
87- 90 F4.1 mJy FluxF770W ? MIRI F770W (7.7um) filter flux density
92- 94 F3.1 mJy e_FluxF770W ? Error in F770W flux density
96- 99 F4.1 mJy FluxF1500W ? MIRI F1500W (15.0um) filter flux density
101-103 F3.1 mJy e_FluxF1500W ? Error in F1500W flux density
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Note (1): Source labels are structured as follows:
C = Star-forming regions first identified by Diaz-Santos et al.,
2007ApJ...661..149D 2007ApJ...661..149D, [DAC2007] CNN in Simbad
N = New star-forming regions identified in the NIRCam/F150W and
NIRCam/F444W filters
P = New star-forming regions specifically identified in the NIRCam/F335M
filter
M = New MIRI/F560W-identified star-forming regions
Note (2): Source classification are as follows:
1 = Star-forming regions with intermediate-aged (>5Myr) populations
(as determined by Diaz-Santos+07)
2 = Star-forming regions with young (<5Myr) populations (as determined by
Diaz-Santos et al., 2007ApJ...661..149D 2007ApJ...661..149D)
3 = Star-forming regions where ages could not be determined
4 = New star-forming regions identified in the NIRCam/F150W filter
5 = New star-forming regions identified in the NIRCam/F444W filter
6 = New star-forming regions identified in the NIRCam/F335M filter
7 = New MIRI/F560W-identified star-forming regions
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Acknowledgements:
Thomas Bohn, tbohn002(at)ucr.edu
References:
Diaz-santos et al., 2007ApJ...661..149D 2007ApJ...661..149D, Resolving the stellar populations
in the circumnuclear ring of NGC 7469.
(End) Thomas Bohn [Hiroshima University], Patricia Vannier [CDS] 16-Sep-2022