J/A+A/673/A121 IRAS 23385+6053 JWST observations (Beuther+, 2023)
JWST Observations of Young protoStars (JOYS).
Outflows and accretion in the high-mass star-forming region IRAS 23385+6053.
Beuther H., van Dishoeck E.F., Tychoniec L., Gieser C., Kavanagh P.J.,
Perotti G., Gelder M.L.van , Klaassen P., Caratti o Garatti A., Francis L.,
Rocha W.R.M., Slavicinska K., Ray T., Justtanont K., Linnartz H.,
Waelkens C., Colina L., Greve T., Guedel M., Henning T., Lagage P.-O.,
Vandenbussche B., Oestlin G., Wright G.
<Astron. Astrophys. 673, A121 (2023)>
=2023A&A...673A.121B 2023A&A...673A.121B (SIMBAD/NED BibCode)
ADC_Keywords: Infrared sources ; Star Forming Region ; Spectra, infrared
Keywords: stars: formation - ISM: clouds -
ISM: individual objects: IRAS 23385+6053 - stars: jets -
stars: massive
Abstract:
Understanding the earliest stages of star formation, and setting that
into context with the general cycle of matter in the interstellar
medium, is a central aspect of research with the James Webb Space
Telescope (JWST).
The JWST program JOYS (JWST Observations of Young protoStars) aims at
characterizing the physical and chemical properties of young high- and
low-mass star-forming regions, in particular the unique mid-infrared
diagnostics of the warmer gas and solid-state components. We present
early results from the high-mass star formation region
IRAS 23385+6053.
The JOYS program uses the Mid-Infrared Instrument (MIRI) Medium
Resolution Spectrometer (MRS) with its Integral Field Unit (IFU) to
investigate a sample of high- and low-mass star-forming protostellar
systems.
The full 5 to 28um MIRI MRS spectrum of IRAS 23385+6053 shows a
plethora of interesting features. While the general spectrum is
typical for an embedded protostar, we see many atomic and molecular
gas lines boosted by the higher spectral resolution and sensitivity
compared to previous space missions. Furthermore, ice and dust
absorption features are also present. Here, we focus on the continuum
emission, outflow tracers like the H2(0-0)S(7),
[FeII](4F9/2-6D9/2) and [NeII](2P1/2-2P3/2) lines as
well as the potential accretion tracer Humphreys α HI(7-6). The
short-wavelength MIRI data resolve two continuum sources A and B,
where mid-infrared source A is associated with the main mm continuum
peak. The combination of mid-infrared and mm data reveals a young
cluster in its making. Combining the mid-infrared outflow tracer H2,
[FeII] and [NeII] with mm SiO data shows a complex interplay of at
least three molecular outflows driven by protostars in the forming
cluster. Furthermore, the Humphreys line is detected at a 3-4σ
level towards the mid-infrared sources A and B. Following Rigliaco et
al. (2015), one can roughly estimate both accretion luminosities and
corresponding accretion rates between ∼2.6x10-6 and
∼0.9x10-4M☉/yr. This is discussed in the context of the
observed outflow rates.
The analysis of the MIRI MRS observations for this young high-mass
star-forming region reveals connected outflow and accretion
signatures. Furthermore, they outline the enormous potential of JWST
to boost our understanding of the physical and chemical processes
during star formation.
Description:
IRAS 23385+6053 was observed within the European MIRI GTO program JOYS
(proposal id. 1290) for 2.12h on August 22, 2022. The entire MIRI
bandpass from ∼4.9 to ∼28.0um was covered in a 4-field mosaic around
the central position of R.A. (J2000.0) 23:40:54.497 and Dec. (J2000.0)
+61:10:27.83. The total exposure time in each the three MIRI spectral
filters was 200 sec, and parallel o-source imaging was conducted in
the F1500W filter.
Objects:
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RA (2000) DE Designation(s)
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23 40 54.50 +61 10 27.9 IRAS 23385+6053 = JCMTSE J234054.3+611028
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 124 19 List of fits images
fits/* . 19 Individual fits images
listsp.dat 77 13 List of spectra
sp/* . 13 Individual spectra
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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- 23 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 33 I4 Kibyte size Size of FITS file
35- 62 A28 --- FileName Name of FITS file, in subdirectory fits
64-124 A61 --- Title Title of the FITS file
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Byte-by-byte Description of file: listsp.dat
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Bytes Format Units Label Explanations
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1- 30 A30 --- FileName Name of the spectrum file in subdirectory sp
33- 77 A45 --- Title Title of the file
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Byte-by-byte Description of file: sp/*
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Bytes Format Units Label Explanations
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1- 24 E24.19 um lambda Wavelength
26- 49 E24.19 Jy Flux Flux density
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Acknowledgements:
Henrik Beuther, beuther(at)mpia.de
(End) Patricia Vannier [CDS] 24-Mar-2023