A procedure for calculating low-velocity components of bipolar outflows in massive star forming regions
1Antyufeyev, O, 1Shulga, V 1Institute of Radio Astronomy of NAS of Ukraine, Kharkiv, Ukraine |
Kinemat. fiz. nebesnyh tel (Online) 2014, 30(3):43-57 |
Start Page: Physics of Stars and Interstellar Medium |
Language: Russian |
Abstract: We present a new method for the calculation of parameters of low-velocity components of bipolar outflows in molecular clouds. The method takes into consideration all possible manifestations of a bipolar outflow in line spectra: asymmetry of line profiles, existence of line wings and systematic shift of the profile along the outflow axis. Our method is adapted for the calculation of parameters of weak bipolar outflows as well as of the outflows whose spectra are characterized by low signal-noise ratio. Using the method, the parameters of bipolar outflows observed in the line of 13СО (J = 1-0) molecule in the G122.0-7.1 source are calculated. |
Keywords: bipolar flows, method, star formation |
1.A. V. Antyufeyev and V. M. Shulga, “Bipolar outflow in the vicinity of IRAS 05345+3157 in 13CO line,” Kinem. Phys. Celest. Bodies 27, 282–290 (2011).
https://doi.org/10.3103/S088459131106002X
2.A. V. Antyufeyev and V. M. Shulga, “Bipolar molecular outflows in the star forming region IRAS 22267+6244,” Radio Phys. Radio Astron. 3, 27–32 (2012).
https://doi.org/10.1615/RadioPhysicsRadioAstronomy.v3.i1.40
3.A. Antyufeyev, M. Toriseva, and V. Shulga, “Large-scale mapping of the IRAS 0042+5530 region in the 12CO (J = 1-0) and 13CO (J = 1-0) molecular lines,” Kinem. Phys. Celest. Bodies 24, 229–235 (2008).
https://doi.org/10.3103/S0884591308050012
4.H. Arce and A. Goodman, “The episodic, precessing giant molecular outflow from IRAS 04239+2436 (HH 300),” Astrophys. J. 554, 132–151 (2001).
https://doi.org/10.1086/321334
5.H. Arce and A. Sargent, “Outflow-infall interactions in early star formation and their impact on the massassembling process in L1228,” Astrophys. J. 612, 342–356 (2004).
https://doi.org/10.1086/422552
6.J. Brand, R. Cesaroni, F. Palla, and S. Molinari, “A molecular-line study of clumps with embedded high-mass protostar candidates,” Astron. Astrophys. 370, 230–264 (2001).
https://doi.org/10.1051/0004-6361:20010190
7.J. F. Gomez, J. M. Torrelles, R. Estalella, G. Anglada, L. Verdes-Montenegro, and P. T. P. Ho, “On the nature of the bipolar molecular outflow in AFGL 437,” Astrophys. J. 397, 492–499 (1992).
https://doi.org/10.1086/171806
8.T. Jenness, P. F. Scott, and R. Padman, “Studies of embedded far infrared sources in the vicinity of H2O masers. I. Observations,” Mon. Not. R. Astron. Soc. 276, 1024–1040 (1995).
9.H. M. Martin, R. E. Hills, and D. B. Sanders, “CO emission from fragmentary molecular clouds. A model applied to observations of M17 SW,” Mon. Not. R. Astron. Soc. 208, 35–55 (1984).
10.T. Neckel and H. J. Staude, “A survey of bipolar and cometary nebulae-photographic and photometric observations,” Astron. Astrophys. 131, 200–209 (1984).
11.M. Tafalla, R. Bachiller, M. C. H. Wright, and W. J. Welch, “A study of the mutual interaction between the Monoceros R2 outflow and its surrounding core,” Astrophys. J. 474, 329–345 (1997).
https://doi.org/10.1086/303447
12.M. Tafalla and P. Myers, “Velocity shifts in L1228: the disruption of a core by an outflow,” Astrophys. J. 491, 653–662 (1997).
https://doi.org/10.1086/304968
13.Qizhou Zhang, T. R. Hunter, J. Brand, T. K. Sridharan, R. Cesaroni, S. Molinari, J. Wang, and M. Kramer, “Search for CO outflows toward a sample of 69 high-mass protostellar candidates. II. Outflow properties,” Astrophys. J. 625, 864–882 (2005).
https://doi.org/10.1086/429660