J/A+A/700/A158 NGC 7023 and Horsehead line list and spectra (Misselt+, 2025)
JWST observations of photodissociation regions. I. Aliphatic and aromatic
carbonaceous dust, ices, and gas-phase spectral line inventory.
Misselt K., Witt A.N., Gordon K.D., Van De Putte D., Trahin B., Abergel A.,
Noriega-Crespo A., Guillard P., Zannese M., Dell'ova P., Baes M.,
Klaassen P., Ysard N.
<Astron. Astrophys. 700, A158 (2025)>
=2025A&A...700A.158M 2025A&A...700A.158M (SIMBAD/NED BibCode)
ADC_Keywords: Selected areas ; Spectra, infrared ; Spectroscopy ;
Molecular clouds ; Interstellar medium ; Extinction
Keywords: dust, extinction - evolution - ISM: lines and bands - ISM: molecules -
photon-dominated region (PDR) - infrared: ISM
Abstract:
This paper provides an overview of the spectroscopic data obtained by
the JWST Guaranteed Time Observations (GTO) program 1192, titled The
Physics and Chemistry of PDR Fronts, including an inventory of the
spatially resolved dust, gas, and molecular content in the Horsehead
Nebula and the NW filament of NGC 7023. We demonstrate the unique
capability of this high spatial resolution data set to elucidate the
evolution of gas and dust at the interface between stars and their
natal clouds at the scale at which the physics and chemistry are at
work. The disassociation regions (PDRs) in the Horsehead Nebula and
the northwest (NW) filament of NGC 7023 were mapped at a spectral
resolving power between 1000-3000 and a spatial resolution of
2-7x10-4pc between 0.97-28um. The data were Obtained as long, narrow
strips with the long axis aligned with the line of sight between the
exciting start and perpendicular to the PDR front. The spectra
extracted from the template regions yield a large number of atomic,
ionized, and molecular lines. Full line lists and extracted spectra
for all ten regions are provided through CDS. Absorption from H2O,
CO2, and CO ices are identified in three regions in NGC 7023. In
this overview, we have focused on the spectral region between three
and five um, which is dominated by emission from aromatic and
aliphatic carbon bonds to illustrate the power of the dataset. We
confirm the entrainment of aromatic carbonaceous species in the
photoevaporative flow from the PDR surface into the H II region in the
Horsehead. No aliphatic emission is present in the outflow, indicating
the complete removal of aliphatic bonds when exposed to strong UV
fields. There is a clear detection of deuterium substitution in the
carbon bonds. Aliphatic D-substitution is more efficient relative to
aromatic D-substitution, ranging from ND/NH∼0.1-0.3 for
aliphatics, compared to ∼0.03 for the aromatics.
Description:
Spectra and line lists for 5 regions in both NGC 7023 and Horsehead
(total of 10 regions) are presented. Each region spectrum extends from
0.97-28.62um. Linelists include center positions, widths, and
integrated strengths for all identified lines along with the
associated uncertainties. Best line identifications along with
possible alternate identifications are presented. The spectral
extractions include flux and continuum [MJy/sr] along with the
associated uncertainties. The continuum columns are computed by
subtracting the fit for each line identified in the associated
linelist file from the flux column.
Objects:
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RA (2000) DE Designation(s)
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21 01 36.90 +68 09 48.0 NGC7023 = NAME IRIS Nebula
05 40 59.00 -02 27 30.0 Horsehead = NAME Horsehead Nebula
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
hdf1sp.dat 52 13753 Spectrum, HORSEHEAD-DF1 (table A1)
hdf1line.dat 192 295 Linelist, HORSEHEAD-DF1 (table B1)
hdf2sp.dat 52 13763 Spectrum, HORSEHEAD-DF2 (table A1)
hdf2line.dat 225 360 Linelist, HORSEHEAD-DF2 (table B1)
hhiisp.dat 52 13757 Spectrum, HORSEHEAD-HII (table A1)
hhiiline.dat 225 24 Linelist, HORSEHEAD-HII (table B1)
hmo1sp.dat 52 13759 Spectrum, HORSEHEAD-MO1 (table A1)
hmo1line.dat 225 312 Linelist, HORSEHEAD-MO1 (table B1)
hmo2sp.dat 52 13757 Spectrum, HORSEHEAD-MO2 (table A1)
hmo2line.dat 225 218 Linelist, HORSEHEAD-MO2 (table B1)
natmsp.dat 52 13762 Spectrum, NGC7023-ATM (table A1)
natmline.dat 225 267 Linelist, NGC7023-ATM (table B1)
ndf1sp.dat 52 13762 Spectrum, NGC7023-DF1 (table A1)
ndf1line.dat 225 327 Linelist, NGC7023-DF1 (table B1)
ndf2sp.dat 52 13762 Spectrum, NGC7023-DF2 (table A1)
ndf2line.dat 225 273 Linelist, NGC7023-DF2 (table B1)
ndf3sp.dat 52 13762 Spectrum, NGC7023-DF3 (table A1)
ndf3line.dat 225 291 Linelist, NGC7023-DF3 (table B1)
nmolsp.dat 52 13762 Spectrum, NGC7023-MOL (table A1)
nmolline.dat 225 203 Linelist, NGC7023-MOL (table B1)
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Byte-by-byte Description of file (#): *sp.dat
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Bytes Format Units Label Explanations
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1- 8 F8.5 um lambda Wavelength
10- 19 E10.8 MJy/sr Flux Flux
21- 30 E10.8 MJy/sr e_Flux Flux, uncertainty
32- 41 E10.8 MJy/sr Cont Continuum
44- 53 E10.8 MJy/sr e_Cont Continuum, uncertainty
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Byte-by-byte Description of file (#): *line.dat
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Bytes Format Units Label Explanations
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1- 8 F8.5 um lamba0 Central wavelength of fit
10- 19 E10.5 um e_lamba0 Central wavelength of fit, uncertainty
21- 30 F10.8 um sigma Width of fitted Gaussian
32- 41 E10.5 um e_sigma Width of fitted Gaussian, uncertainty
43- 52 E10.5 MJy/sr.um Area Normalization of Gaussian
54- 63 E10.5 MJy/sr.um e_Area Normalization of Gaussian, uncertainty
65- 74 E10.5 mW/m2/sr str Integrated line strength
76- 85 E10.5 mW/m2/sr e_str Integrated line strength, uncertainty
87- 94 F8.5 um lam0 Line list line center of identified line
96-103 A8 -- Species Species
105-149 A45 -- Trans Transition
151-225 A75 -- Alt Alternate identification(s)/transition(s)
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Acknowledgements:
Karl Misselt, misselt(at)arizona.edu
(End) Patricia Vannier [CDS] 14-Jul-2025