Star formation toward the H~II region IRAS 10427-6032

Abstract

The formation and properties of star clusters formed at the edges of H II regions are poorly known. We study stellar content, physical conditions, and star formation processes around a relatively unknown young H II region IRAS 10427-6032, located in the southern outskirts of the Carina Nebula. We make use of near-IR data from VISTA, mid-IR from Spitzer and WISE, far-IR from Herschel, sub-mm from ATLASGAL, and 843 MHz radio-continuum data. Using multi-band photometry, we find a total of 5 Class I and 29 Class II young stellar object (YSO) candidates, most of which newly identified, in the 5'$\times$5' region centered on the IRAS source position. Modeling of the spectral energy distribution for selected YSO candidates using radiative transfer models shows that most of these candidates are intermediate mass YSOs in their early evolutionary stages. A majority of the YSO candidates are found to be coincident with the cold dense clump at the western rim of the H II region. Lyman continuum luminosity calculation using radio emission indicates the spectral type of the ionizing source to be earlier than B0.5-B1. We identified a candidate massive star possibly responsible for the H II region with an estimated spectral type B0-B0.5. The temperature and column density maps of the region constructed by performing pixel-wise modified blackbody fits to the thermal dust emission using the far-IR data show a high column density shell-like morphology around the H II region, and low column density (0.6 $\times$ 10${}^{22}$ cm${}^{-2}$) and high temperature ($\sim$21 K) matter within the H II region. Based on the morphology of the region in the ionized and the molecular gas, and the comparison between the estimated timescales of the H II region and the YSO candidates in the clump, we argue that the enhanced star-formation at the western rim of the H II region is likely due to compression by the ionized gas.

arXiv comment12 pages, 9 figures, 2 tables, Accepted for publication in New Astronomy

References in corpus (36)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory
• The Herschel-SPIRE instrument and its in-flight performance
• Interpreting Spectral Energy Distributions from Young Stellar Objects. I. A grid of 200,000 YSO model SEDs
• A Spitzer Survey of Young Stellar Clusters within One Kiloparsec of the Sun: Cluster Core Extraction and Basic Structural Analysis
• Database of Geneva stellar evolution tracks and isochrones for UBVRIJHKLL'M, HST-WFPC2, Geneva and Washington photometric systems
• 2-D Radiative Transfer in Protostellar Envelopes: II. An Evolutionary Sequence
• Infrared Extinction Toward Nearby Star-Forming Regions
• ATLASGAL - Compact source catalogue: 330 < l < 21 degrees
• The Structure of the Homunculus: I. Shape and Latitude Dependence from H2 and [Fe II] Velocity Maps of Eta Carinae
• An Atlas of Galaxy Spectral Energy Distributions from the Ultraviolet to the Mid-Infrared
• The Molonglo Galactic Plane Survey (MGPS-2): Compact Source Catalogue
• Triggered massive-star formation on the borders of Galactic HII regions. II. Evidence for the collect and collapse process around RCW 79
• An all-sky Support Vector Machine selection of WISE YSO Candidates
• Ionisation-induced star formation I: The collect and collapse model
• Radiation driven implosion and triggered star formation
• StarBench: The D-type expansion of an HII region
• Clumps and triggered star formation in ionised molecular clouds
• Distance and the Initial Mass Function of Young Open Clusters In The Eta Carina Nebula: Tr 14 and Tr 16
• Age, size, and position of H ii regions in the Galaxy. Expansion of ionized gas in turbulent molecular clouds
• Herschel far-infrared observations of the Carina Nebula complex I: Introduction and global cloud structure
• Dust in the diffuse emission of the galactic plane - The Herschel/Spitzer SED fitting
• Photodissociation regions and star formation in the Carina Nebula
• Comparing simulations of ionisation triggered star formation and observations in RCW 120
• Infrared Emission and the Destruction of Dust in HII regions
• Star formation in bright-rimmed clouds and cluster associated with W5 E H{\sc ii} region
• The molecular complex associated with the Galactic HII region Sh2-90: a possible site of triggered star formation
• Interactions of the Infrared bubble N4 with the surroundings
• A SCUBA survey of bright-rimmed clouds
• Young stellar population and ongoing star formation in the HII complex Sh2-252
• The star cluster Collinder 232 in the Carina complex and its relation to Trumpler 14/16
• Study of morphology and stellar content of the Galactic HII region IRAS 16148-5011
• Young Stellar Population of the Bright-Rimmed Clouds BRC 5, BRC 7 and BRC 39
• The Milky Way Project and ATLASGAL: The distribution and physical properties of cold clumps near infrared bubbles
• The VISTA Carina Nebula Survey II. Spatial distribution of the infrared-excess-selected young stellar population
• Stars at the Tip of Peculiar Elephant Trunk-Like Clouds in IC 1848E: A Possible Third Mechanism of Triggered Star Formation