J/A+A/632/A115 L1188 HCO+, 12CO and 13CO datacubes (Gong+, 2019)
Searching for further evidence for cloud-cloud collisions in L1188.
Gong Y., Tang X.D., Henkel C., Menten K.M., Mao R.Q., Wang Y., Lee M.-Y.,
Zhu W.S., Lin Y., Zhang S.B., Chen X.P., Yang W.J.
<Astron. Astrophys. 632, A115 (2019)>
=2019A&A...632A.115G 2019A&A...632A.115G (SIMBAD/NED BibCode)
ADC_Keywords: Molecular clouds ; Interstellar medium ; Radio lines
Keywords: ISM: clouds - ISM: kinematics and dynamics - radio lines: ISM -
ISM: molecules - ISM: individual objects: L1188
Abstract:
In order to search for further observational evidence of cloud-cloud
collisions in one of the promising candidates, L1188, we carried out
observations of multiple molecular lines toward the intersection
region of the two nearly orthogonal filamentary molecular clouds in
L1188. Based on these observations, we find two parallel filamentary
structures, both of which have at least two velocity components being
connected with broad bridging features. We also found a spatially
complementary distribution between the two molecular clouds, as well
as enhanced 13CO emission and 12CO self-absorption toward
their abutting regions. At the most blueshifted velocities, we
unveiled a 1pc-long arc ubiquitously showing 12CO line wings. We
discovered two 22GHz water masers, which are the first maser
detections in L1188. An analysis of line ratios at a linear resolution
of 0.2 pc suggests that L1188 is characterised by kinetic temperatures
of 13-23K and H2 number densities of 103-103.6cm-3. On the
basis of previous theoretical predictions and simulations, we suggest
that these observational features can be naturally explained by the
scenario of a cloud-cloud collision in L1188, although an additional
contribution of stellar feedback from low-mass young stellar objects
cannot be ruled out.
Description:
We include four FITS files containing the data-cubes
(position-position-velocity) of HCO+(1-0), 12CO(2-1), 12CO(3-2),
13CO(2-1) emission lines. We used the J2000 equatorial coordinates
for the spatial dimensions and Vlsr for the spectral dimension. All
the intensities have been converted to a scale of main beam
temperatures in units of K.
Objects:
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RA (ICRS) DE Designation(s)
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22 16.7 +61 45 L1188 = LDN1188
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 149 4 List of fits files
fits/* . 4 Individual fits files
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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- 22 I3 --- Nx Number of pixels along X-axis
24- 26 I3 --- Ny Number of pixels along Y-axis
28- 31 I4 --- Nz Number of slices
33- 41 F9.2 MHz nu Rest frequency
43- 44 I2 arcsec FWHM Beam size
46- 54 F9.1 m/s bVRAD Lower value of VRAD interval
56- 64 F9.3 m/s BVRAD Upper value of VRAD interval
66- 73 F8.4 m/s dVRAD VRAD resolution
75- 80 I6 Kibyte size Size of FITS file
82- 92 A11 --- FileName Name of FITS file, in subdirectory fits
94-149 A56 --- Title Title of the FITS file
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Acknowledgements:
Yan Gong, ygong(at)mpifr-bonn.mpg.de
(End) Yan Gong [MPIFR], Patricia Vannier [CDS] 21-Nov-2019