Proper Motions of Young Stellar Outflows in the Mid-infrared with Spitzer (IRAC). I. The NGC 1333 Region
Abstract
We use two 4.5 μm Spitzer (IRAC) maps of the NGC 1333 region taken over a ~7 yr interval to determine proper motions of its associated outflows. This is a first successful attempt at obtaining proper motions of stellars' outflow from Spitzer observations. For the outflow formed by the Herbig-Haro objects HH7, 8, and 10, we find proper motions of ~9-13 km s-1, which are consistent with previously determined optical proper motions of these objects. We determine proper motions for a total of eight outflows, ranging from ~10 to 100 km s-1. The derived proper motions show that out of these eight outflows, three have tangential velocities <=20 km s-1. This result shows that a large fraction of the observed outflows have low intrinsic velocities and that the low proper motions are not merely a projection effect.
- Publication:
-
The Astronomical Journal
- Pub Date:
- February 2013
- DOI:
- 10.1088/0004-6256/145/2/28
- arXiv:
- arXiv:1211.0273
- Bibcode:
- 2013AJ....145...28R
- Keywords:
-
- circumstellar matter;
- Herbig-Haro objects;
- infrared: ISM;
- ISM: individual objects: HH7-11 NGC 1333;
- ISM: jets and outflows;
- stars: formation;
- Astrophysics - Astrophysics of Galaxies;
- Astrophysics - Instrumentation and Methods for Astrophysics
- E-Print:
- Accepted in the Astronomical Journal