Query : 2013A&A...559A..79R

2013A&A...559A..79R - Astronomy and Astrophysics, volume 559A, 79-79 (2013/11-1)

APEX/SABOCA observations of small-scale structure of infrared-dark clouds. I. Early evolutionary stages of star-forming cores.


Abstract (from CDS):

Infrared-dark clouds (IRDCs) harbor the early phases of cluster and high-mass star formation and are comprised of cold (∼20K), dense (n>104cm–3) gas. The spectral energy distribution (SED) of IRDCs is dominated by the far-infrared and millimeter wavelength regime, and our initial Herschel study examined IRDCs at the peak of the SED with high angular resolution. Here we present a follow-up study using the SABOCA instrument on APEX which delivers 7.8'' angular resolution at 350µm, matching the resolution we achieved with Herschel/PACS, and allowing us to characterize substructure on ∼0.1pc scales. Our sample of 11 nearby IRDCs are a mix of filamentary and clumpy morphologies, and the filamentary clouds show significant hierarchical structure, while the clumpy IRDCs exhibit little hierarchical structure. All IRDCs, regardless of morphology, have about 14% of their total mass in small scale core-like structures which roughly follow a trend of constant volume density over all size scales. Out of the 89 protostellar cores we identified in this sample with Herschel, we recover 40 of the brightest and re-fit their SEDs and find their properties agree fairly well with our previous estimates (<T≳19K). We detect a new population of ``cold cores'' which have no 70µm counterpart, but are 100 and 160µm-bright, with colder temperatures (<T≳16K). This latter population, along with SABOCA-only detections, are predominantly low-mass objects, but their evolutionary diagnostics are consistent with the earliest starless or prestellar phase of cores in IRDCs.

Abstract Copyright:

Journal keyword(s): catalogs - stars: formation - ISM: structure - submillimeter: ISM

Status at CDS : All or part of tables of objects could be ingested in SIMBAD; there are some issues with cross-identifications or classifications.

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 NAME the Pipe Nebula DNe 17 30 -25.0           ~ 378 1
2 MMB G011.109-00.114 Y*O 18 10 28.25 -19 22 29.1           ~ 50 0
3 NAME Cyg X Cld 20 28 41 +41 10.2           ~ 757 1

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