The seeds of star formation in the filamentary infrared-dark cloud G011.11-0.12

TL;DR

This study uses Herschel data to identify and characterize 18 pre- and protostellar cores in the filamentary IRDC G011.11-0.12, revealing ongoing star formation and potential for massive star and cluster formation.

Contribution

First detailed far-infrared analysis of cores in G011.11-0.12, providing insights into core properties and star formation stages in this IRDC.

Findings

18 cores identified, 2 with >50 Msun.

Cores show elevated temperatures (~22 K).

Core separation exceeds Jeans length.

Abstract

Infrared-dark clouds (IRDCs) are the precursors to massive stars and stellar clusters. G011.11-0.12 is a well-studied filamentary IRDC, though, to date, the absence of far-infrared data with sufficient spatial resolution has limited the understanding of the structure and star-formation activity. We use Herschel to study the embedded population of young pre- and protostellar cores in this IRDC. We examine the cloud structure, which appears in absorption at short wavelength and in emission at longer wavelength. We derive the properties of the massive cores from the spectral energy distributions of bright far-infrared point sources detected with the PACS instrument aboard Herschel. We report on the detection and characterization of pre- and protostellar cores in a massive filamentary infrared-dark cloud G011.11-0.12 using PACS. We characterize 18 cores directly associated with the filament, two of which have masses over 50 Msun, making them the best candidates to become massive stars in G011.11-0.12. These cores are likely at various stages of protostar formation, showing elevated temperature (<T> ~ 22 K) with respect to the ambient gas reservoir. The core masses (<M> ~ 24 Msun) are small compared to that in the cold filament. The mean core separation is 0.9 pc, well in excess of the Jeans length in the filament. We confirm that star formation in IRDCs is underway and diverse, and IRDCs have the capability of forming massive stars and clusters.