Star Formation Associated With the SNR IC443

Abstract

We have performed the submillimeter and millimeter observations in CO lines toward supernova remnant (SNR) IC443. CO molecular shell is well coincident with the partial shell of the SNR detected in radio continuum observations. The broad emission lines and three 1720-MHz OH masers were detected in CO molecular shell. The present observations have provided further evidence in support of the interaction between the SNR and the adjoining molecular clouds (MCs). The total mass of the MCs is 9.26*10^{3} sun masses. The integrated CO line intensity ratio I(CO(3-2))/I(CO(2-1)) for the whole molecular cloud is between 0.79 and 3.40. The average value is 1.58, which is much higher than previous measurements of individual Galactic MCs. Higher line ratios imply that shocks have driven into the MCs. We conclude that high I(CO(3-2))/I(CO(2-1)) is identified as one good signature of SNR-MCs interacting system. Based on $IRAS$ Point Source Catalog and 2MASS near-infrared database, 12 protostellar objects and 1666 young stellar objects (YSOs) candidates (including 154 CTTSs and 419 HAeBe stars) are selected. In the interacting regions, the significant enhancement of the number of protostellar objects and YSOs indicates the presence of some recently formed stars. After comparing the characteristic timescales of star formation with the age of IC443, we conclude that the protostellar objects and YSOs candidates are not triggered by IC443. For the age of stellar winds shell, we have performed calculation on the basis of stellar winds shell expansion model. The results and analysis suggest that the formation of these stars may be triggered by the stellar winds of IC443 progenitor.

22 pages, 8 figures and 2 tables. Accepted, ApJ

References in corpus (3)

• The Evolution of Supernovae in Circumstellar Wind Bubbles II: Case of a Wolf-Rayet star
• GBT Observations of IC 443: the Nature of OH(1720 MHz) Masers and OH Absorption
• Star formation triggered by SN explosions: an application to the stellar association of $\beta$ Pictoris

Cited by in corpus (23)

• Radio emission from Supernova Remnants
• A Systematic Survey for Broadened CO Emission Toward Galactic Supernova Remnants
• Identification of Ambient Molecular Clouds Associated with Galactic Supernova Remnant IC443
• The infrared dust bubble N22: an expanding HII region and the star formation around it
• Numerical simulations of supernova remnants in turbulent molecular clouds
• Toward the Understanding of the Physical Origin of Recombining Plasma in the Supernova Remnant IC 443
• Interaction between Cassiopeia A and Nearby Molecular Clouds
• Non-Zeeman Circular Polarization of CO rotational lines in SNR IC 443
• ALMA-IMF X -- The core population in the evolved W33-Main (G012.80) protocluster
• AKARI Near-infrared Spectral Observations of Shocked H2 Gas of the Supernova Remnant IC 443
• Submillimeter/millimeter observations of the molecular clouds associated with the Tycho' Supernova Remnant
• Interstellar anatomy of the TeV gamma-ray peak in the IC443 supernova remnant
• Star formation associated with the infrared dust bubble N68
• The open cluster NGC6823 and possible triggered star formation associated with SNR G59.5+0.1
• Ortho-to-Para Ratio Studies of Shocked H2 Gas in the Two Supernova Remnants IC 443 and HB 21
• Multiple gas phases in supernova remnant IC 443: mapping shocked H${}_2$ with VLT/KMOS
• Multi-wavelength study of triggered star formation around 25 H II regions
• The Origem Loop
• CO J=2-1 and CO J=3-2 observations toward the high-mass protostellar candidate IRAS 20188+3928
• The molecular emission from old supernova remnants
• Comparing the spatial and kinematic distribution of gas and young stars around the shell-like structure in the CMa OB1 association
• Investigation of the Physical Origin of Overionized Recombining Plasma in the Supernova Remnant IC 443 with XMM-Newton
• The Supernova-ISM/Star formation Interplay