J/A+A/626/A131 G287.84-0.82 SOFIA and APEX datacubes (Mookerjea+, 2019)
Opening the Treasure Chest in Carina.
Mookerjea B., Sandell G., Guesten R., Riquelme D., Wiesemeyer H.,
Chambers E.
<Astron. Astrophys. 626, A131 (2019)>
=2019A&A...626A.131M 2019A&A...626A.131M (SIMBAD/NED BibCode)
ADC_Keywords: Associations, stellar ; Radio lines
Keywords: ISM: molecules - ISM: lines and bands - photon-dominated regions -
submillimeter: ISM - ISM: clouds
Abstract:
We have mapped the G287.84-0.82 cometary globule (with the Treasure
Chest cluster embedded in it) in the South Pillars region of Carina
(i) in [CII], 63um [OI] , and CO(11-10) using the heterodyne
receiver array upGREAT on SOFIA and (ii) in J=2-1 transitions of CO,
13CO, C18O and J=3-2 transitions of H2CO using the APEX
telescope in Chile. We use these data to probe the morphology,
kinematics, and physical conditions of the molecular gas and the
photon dominated regions (PDRs) in G287.84-0.82. The velocity-resolved
observations of [CII] and [OI] suggest that the overall structure of
the pillar (with red-shifted photo evaporating tails) is consistent
with the effect of FUV radiation and winds from eta-Car and O stars in
Trumpler 16. The gas in the head of the pillar is strongly influenced
by the embedded cluster, whose brightest member is an O9.5 V star,
CPD -59 2661. The emission of the [CII] and [OI] lines peak at a
position close to the embedded star, while all the other tracers peak
at another position lying to the north-east consistent with gas being
compressed by the expanding PDR created by the embedded cluster. The
molecular gas inside the globule is probed with the J=2-1 transitions
of CO and isotopologues as well as H2CO, and analyzed using a
non-LTE model (escape-probability approach), while we use PDR models
to derive the physical conditions of the PDR. We identify at least two
PDR gas components; the diffuse part (∼104cm-3^) is traced by [CII],
while the dense (n∼2-8x105cm-3) part is traced by [CII], [OI],
CO(11-10). Using the the F=2-1 transition of [13CII] detected at 50
positions in the region, we derive optical depths (0.9-5), excitation
temperatures of [CII] (80-255K), and N(C+) of 0.3-1x1019cm-2. The
total mass of the globule is ∼1000M☉, about half of which is
traced by [CII]. The dense PDR gas has a thermal pressure of
107-108K/cm3, which is similar to the values observed in other
regions.
Description:
The FITS datacubes observed and presented in this paper are for [CII]
at 158um, [OI] at 63um and CO(11-10) observed with upGREAT/SOFIA and
2-1 transitions of CO, 13CO and C18O observed with APEX, Chile.
All spectra, integrated-intensity, channel and position-velocity maps
presented in this paper have been derived from the fits datacubes in
this archive. The intensity of the spectral cubes correspond to the
main beam temperatures expressed in Kelvin and all cubes are at a
common spectral resolution of 0.5km/s.
Objects:
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RA (2000) DE Designation(s)
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10 46 04 -59 58.0 G287.84-0.82 = [SEC2000] G287.84-0.82
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 106 6 List of fits datacubes
fits/* . 6 Individual fits datacubes
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See also:
J/MNRAS/355/1237 : JHKs photometry of G287.84-0.82 members (Hagele+, 2004)
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- 21 I2 --- Nx Number of pixels along X-axis
23- 24 I2 --- Ny Number of pixels along Y-axis
26- 28 I3 --- Nz Number of pixels along Z-axis
30- 36 I7 m/s bVRAD Lower value of VRAD interval
38- 42 I5 m/s BVRAD Upper value of VRAD interval
44- 46 I3 m/s dVRAD [500] VRAD resolution
48- 51 I4 Kibyte size Size of FITS file
53- 71 A19 --- FileName Name of FITS file, in subdirectory fits
73-106 A34 --- Title Title of the FITS file
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Acknowledgements:
Bhaswati Mookerjea, bhaswati(at)tifr.res.in
(End) Patricia Vannier [CDS] 10-May-2019