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Title: Weak and compact radio emission in early massive star formation regions: an ionized jet toward G11.11–0.12P1

We report 1.3 cm and 6 cm continuum observations toward the massive proto-stellar candidate G11.11–0.12P1 using the Karl G. Jansky Very Large Array. We detect a string of four unresolved radio continuum sources coincident with the mid-infrared source in G11P1. The continuum sources have positive spectral indices consistent with a thermal (free-free) ionized jet. The most likely origins of the ionized gas are shocks due to the interaction of a stellar wind with the surrounding high-density material. We also present NIR United Kingdom Infrared Telescope (UKIRT) archival data that show an extended structure detected only at K band (2.2 μm), which is oriented perpendicular to the jet, and that may be scattered light from a circumstellar disk around the massive protostar. Our observations plus the UKIRT archival data thus provide new evidence that a disk/jet system is present in the massive proto-stellar candidate located in the G11.11–0.12P1 core.
Authors:
; ;  [1] ; ; ; ;  [2] ; ;  [3] ;  [4] ;  [5] ;  [6]
  1. Physics Department, New Mexico Tech, 801 Leroy Place, Socorro, NM 87801 (United States)
  2. Centro de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, Morelia 58090 (Mexico)
  3. Max-Planck-Institute für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn (Germany)
  4. Physics Department, Western Illinois University, 1 University Circle, Macomb, IL 61455 (United States)
  5. INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze (Italy)
  6. School of Physical Sciences, University of Tasmania, Private Bag 37, Hobart, Tasmania 7001 (Australia)
Publication Date:
OSTI Identifier:
22370122
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 796; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DENSITY; EMISSION; INTERACTIONS; STARS; STELLAR WINDS; TELESCOPES; UNITED KINGDOM; VISIBLE RADIATION