J/A+A/574/A104 Dense cores in L1495/B213 complex (Tafalla+, 2015)
Chains of dense cores in the Taurus L1495/B213 complex.
Tafalla M., Hacar A.
<Astron. Astrophys. 574, A104 (2015)>
=2015A&A...574A.104T 2015A&A...574A.104T
ADC_Keywords: Molecular clouds ; Interstellar medium
Keywords: stars: formation - ISM: abundances - ISM: kinematics and dynamics -
ISM: molecules - radio lines: ISM
Abstract:
Cloud fragmentation into dense cores is a critical step in the process
of star formation. A number of recent observations show that it is
connected to the filamentary structure of the gas, but the processes
responsible for core formation remain mysterious.
We studied the kinematics and spatial distribution of the dense gas in
the L1495/B213 filamentary region of the Taurus molecular cloud with
the goal of understanding the mechanism of core formation.
We mapped the densest regions of L1495/B213 in N2H+(1-0) and
C18O(2-1) with the IRAM 30m telescope, and complemented these data
with archival dust-continuum observations from the Herschel Space
Observatory.
Description:
We observed selected regions of the L1495/B213 cloud with
the IRAM 30m telescope during one session in February-March
2013 and another one the following June. In both sessions
we used the EMIR heterodyne receiver in frequency-switching mode
together with the VESPA autocorrelator.
The observations consisted of simultaneous on-the-fly maps
in the lines of N2H+(1-0) (93.17GHz) and C18O(2-1) (219.56GHz)
in dual polarization mode.
All fits files are data cubes with the same spatial limits as the maps
shown in the paper (Fig. 2) and have 400 velocity channels. The files
were generated using the original data files, which were in CLASS
format, which is the native format of the IRAM 30m telescope.
Objects:
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RA (ICRS) DE Designation(s)
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04 17 24 +28 33 B7 = Barnard 7
04 18 42 +28 16 B10 = Barnard 10
04 17 35 +27 43.1 B211 = Barnard 211
04 20 51 +27 16.3 B213 = Barnard 213
04 28 06 +26 16 B218 = Barnard 218
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 126 10 List of FITS datacubes
fits/* . 10 Individual FITS data cubes
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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- 24 F5.2 arcsec/pix Scale [9/10] Scale of the image
26- 28 I3 --- Nx [58/176] Number of pixels along X-axis
30- 32 I3 --- Ny [51/144] Number of pixels along Y-axis
34- 36 I3 --- Nz [400] Number of slices
38- 45 F8.2 m/s V.min [-5569/1667] Lower value of velocity interval
47- 53 F7.1 m/s V.max [12307/19506] Upper value of velocity interval
55- 58 F4.1 m/s dV [26/63] Velocity resolution
60- 69 F10.6 GHz Freq [93/220] Rest frequency of the transition
71- 75 I5 Kibyte size [4632/33559] Size of the FITS file
77- 90 A14 --- FileName Name of the FITS file in subdirectory fits
92-126 A35 --- Title Title of the file
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Acknowledgements:
Mario Tafalla, m.tafalla(at)oan.es
(End) Patricia Vannier [CDS] 30-Jan-2015