Affiliation:
1. Department of Earth and Space Sciences, Indian Institute of Space Science and Technology , Thiruvananthapuram 695547, India
2. I. Physikalisches Institut, Universität zu Köln , Zülpicher Str.77, D-50937 Köln, Germany
3. Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research , Mumbai 400005, India
Abstract
ABSTRACT
The star-forming activity in the H ii region RCW 42 is investigated using multiple wavebands, from near-infrared to radio wavelengths. Located at a distance of 5.8 kpc, this southern region has a bolometric luminosity of 1.8 × 106 L⊙. The ionized gas emission has been imaged at low radio frequencies of 610 and 1280 MHz using the Giant Metrewave Radio Telescope, India, and shows a large expanse of the H ii region, spanning 20 × 15 pc2. The average electron number density in the region is estimated to be ∼70 cm−3, which suggests an average ionization fraction of the cloud to be 11 % . An extended green object EGO G274.0649-01.1460 and several young stellar objects have been identified in the region using data from the 2MASS and Spitzer surveys. The dust emission from the associated molecular cloud is probed using Herschel Space Telescope, which reveals the presence of five clumps, C1-C5, in this region. Two millimetre emission cores of masses 380 and 390 M⊙ towards the radio emission peak have been identified towards C1 from the ALMA map at 1.4 mm. The clumps are investigated for their evolutionary stages based on association with various star-formation tracers, and we find that all the clumps are in active/evolved stage.
Funder
Tata Institute of Fundamental Research
Department of Science and Technology
Science and Engineering Research Board
Alexander von Humboldt Foundation
Department of Atomic Energy, Government of India
University of Massachusetts
California Institute of Technology
National Aeronautics and Space Administration
National Science Foundation
Jet Propulsion Laboratory
ALMA
ADS
ESO
NINS
NRC
MOST
KASI
NAOJ
Publisher
Oxford University Press (OUP)
Subject
Space and Planetary Science,Astronomy and Astrophysics