Discovery of a Highly Collimated Flow from the High-mass Protostar ISOSS J23053+5953 SMM2
Por:
Rodriguez, Tatiana M., Hofner, Peter, Araya, Esteban D., Zhang, Qizhou, Linz, Hendrik, Kurtz, Stanley, Gomez, Laura, Carrasco-Gonzalez, Carlos, Rosero, Viviana
Publicada:
1 nov 2021
Resumen:
We present Very Large Array C-, X-, and Q-band continuum observations,
as well as 1.3 mm continuum and CO(2-1) observations with the
Submillimeter Array toward the high-mass protostellar candidate ISOSS
J23053+5953 SMM2. Compact centimeter continuum emission was detected
near the center of the SMM2 core with a spectral index of 0.24(+/- 0.15)
between 6 and 3.6 cm, and a radio luminosity of 1.3(+/- 0.4) mJy kpc(2).
The 1.3 mm thermal dust emission indicates a mass of the SMM2 core of
45.8 (+/- 13.4) M (circle dot), and a density of 7.1 (+/- 1.2)x 10(6)
cm(-3). The CO(2-1) observations reveal a large, massive molecular
outflow centered on the SMM2 core. This fast outflow (>50 km s(-1) from
the cloud systemic velocity) is highly collimated, with a broader,
lower-velocity component. The large values for outflow mass (45.2 +/-
12.6 M (circle dot)) and momentum rate (6 +/- 2 x 10(-3) M (circle dot)
km s(-1)yr(-1)) derived from the CO emission are consistent with those
of flows driven by high-mass YSOs. The dynamical timescale of the flow
is between 1.5 and 7.2 x 10(4) yr. We also found from the (CO)-O-18 to
thermal dust emission ratio that CO is depleted by a factor of about 20,
possibly due to freeze-out of CO molecules on dust grains. Our data are
consistent with previous findings that ISOSS J23053 + 5953 SMM2 is an
emerging high-mass protostar in an early phase of evolution, with an
ionized jet and a fast, highly collimated, and massive outflow.
Filiaciones:
New Mexico Inst Min & Technol, Phys Dept, 801 Leroy Pl, Socorro, NM 87801 USA
Natl Radio Astron Observ, 1003 Lopezville Rd, Socorro, NM 87801 USA
Western Illinois Univ, Phys Dept, 1 Univ Circle, Macomb, IL 61455 USA
Ctr Astrophys Harvard & Smithsonian, 60 Garden St, Cambridge, MA 02138 USA
Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
Univ Nacl Autonoma Mexico, Inst Radioastron & Astrofis, Apdo Postal 72-3 Xangari, Morelia 58089, Michoacan, Mexico
Joint ALMA Observ, Alonso Cordova 3107, Santiago, Chile
Green Submitted, All Open Access; Green
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