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J/A+A/591/A5 ATLASGAL dense filamentary structures (Li+, 2016)
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Beginning of ReadMe :J/A+A/591/A5 ATLASGAL dense filamentary structures (Li+, 2016)
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ATLASGAL: A Galaxy-wide sample of dense filamentary structures.
Li G.-X., Urquhart J.S., Leurini S., Csengeri T., Wyrowski F.,
Menten K.M., Schuller F.
<Astron. Astrophys. 591, A5 (2016)>
=2016A&A...591A...5L (SIMBAD/NED BibCode)
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ADC_Keywords: Surveys ; Interstellar medium ; Morphology
Keywords: stars: formation - surveys - submillimeter: ISM - catalogs
Abstract:
We study the properties of filamentary structures from the ATLASGAL
survey.
We use the DisPerSE algorithm to identify spatially coherent
structures located across the inner-Galaxy (300<l<60 and |b|<1.5).
We have determined distances, masses and physical sizes for 241 of the
filamentary structures. We find a median distance of 3.8kpc, a mean
mass of a few 10^3^M_sun_, a mean length of 6pc and a
mass-to-length ratio of (M/L) 200-2000M_sun/pc. We also find that
these filamentary structures are tightly correlated with the spiral
arms in longitude and velocity, and that their semi-major axis is
preferentially aligned parallel to the Galactic mid-plane and
therefore with the direction of large-scale Galactic magnetic field.
We find many examples where the dense filaments identified in ATLASGAL
are associated with larger scale filamentary structures ( 100pc), and
argue that this is likely to be common, and as such these may indicate
a connection between large-scale Galactic dynamics and star formation.
We have produced a large and Galaxy-wide catalogue of dense
filamentary structures that are representative of a particular size
and mass range not previously well studied in the literature. Analyses
of the properties and distribution of these filaments reveals that
they are correlated with the spiral arms and make a significant
contribution to star formation in the Galaxy. Massive star formation
is ongoing within 20% of the filaments and is strongly correlated
with the filaments with the largest mass-to- length ratios. The
luminosity of the embedded sources has a similar distribution to the
Galactic-wide samples of young massive stars and can therefore be
considered to be representative.
Description:
The ATLASGAL survey (Schuller et al., 2009A&A...504..415S) covers
300deg<l<60deg and |b|<15deg. It has a typical noise level of
50-70mJy/beam and is sensitive to gas with H_2_ column densities
exceeding 10^22^cm^-2^.
We aim to study filamentary structures in the ATLASGAL survey. This
has been achieved through two steps. First, we extract skeleton
representations of structures in the dust continuum emission maps with
the DisPerSE (Discrete Persistent Extractor; Sousbie,
2011MNRAS.414..350S). Then, the extracted structures are classified,
and filamentary structures are identified.