Access to Astronomical Catalogues

← Click to display the menu
J/A+A/499/175       12CO(2-1) map of NGC 2264-C                 (Maury+, 2009)

Probing the role of protostellar feedback in clustered star formation. Mapping outflows in the collapsing protocluster NGC 2264-C. Maury A. J., Andre P., Li Z.-Y. <Astron. Astrophys. 499, 175 (2009)> =2009A&A...499..175M
ADC_Keywords: Associations, stellar ; Millimetric/submm sources ; Radio lines Keywords: stars: formation : circumstellar matter - ISM : individual objects : NGC 2264-C - ISM : kinematics and dynamics - ISM : outflows Abstract: The role played by protostellar feedback in clustered star formation is still a matter of debate. In particular, protostellar outflows have been proposed as a source of turbulence in cluster-forming clumps, which may provide support against global collapse for several free-fall times. Here, we seek to test the above hypothesis in the case of the well-documented NGC 2264-C protocluster, by quantifying the amount of turbulence and support injected in the surrounding medium by protostellar outflows. Using the HERA heterodyne array on the IRAM 30m telescope, we carried out an extensive mapping of NGC 2264-C in the three molecular line transitions 12CO(2-1), 13CO(2-1), and C18O(2-1). We found widespread high-velocity 12 CO emission, testifying to the presence of eleven outflow lobes, closely linked to the compact millimeter continuum sources previously detected in the protocluster. We carried out a detailed analysis of the dynamical parameters of these outflows, including a quantitative evaluation of the overall momentum flux injected in the cluster-forming clump. These dynamical parameters were compared to the gravitational and turbulent properties of the clump. We show that the population of protostellar outflows identified in NGC 2264-C is likely to contribute a significant fraction of the observed turbulence but cannot efficiently support the protocluster against global collapse. Gravity appears to largely dominate the dynamics of the NGC 2264-C clump at the present time ; however it is possible that an increase in the star formation rate during the later evolution of the protocluster will trigger enough outflows to finally halt the contraction of the cloud. Description: 12CO(2-1) data cube of the map obtained with the IRAM 30m telescope towards the NGC 2264-C protocluster. The map is 6'x6' wide, and was taken in the "on-the-fly" mode with the HERA array which allowed a 4" sampling. The angular resolution was ∼11" and the spectral resolution was 0.84km/s. The (0,0) of the map is located at the position of the millimetric compact core CMM3 in NGC2264-C, which coordinates are given in ngc2264c.dat. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file ngc2264c.dat 63 1 Information on the map 2880 2071 12CO(2-1) data cube FITS file
Byte-by-byte Description of file: ngc2264c.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Name 11- 12 I2 h RAh Right ascension (J2000) 14- 15 I2 min RAm Right ascension (J2000) 17- 22 F6.3 s RAs Right ascension (J2000) 24 A1 --- DE- Declination sign 25- 26 I2 deg DEd Declination (J2000) 28- 29 I2 arcmin DEm Declination (J2000) 31- 35 F5.2 arcsec DEs Declination (J2000) 37- 39 F3.1 km/s LSR Mean LSR velocity of the cloud 41- 50 F10.3 GHz Freq Central frequency of the mapping 52- 63 A12 --- FileName Name of the FITS data cube file
Acknowledgements: Anaelle Maury, anaelle.maury(at)
(End) Anaelle Maury [CEA-SAp, France], Patricia Vannier [CDS] 25-May-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service