2016A&A...591A...5L


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.18CET04:13:42

2016A&A...591A...5L - Astronomy and Astrophysics, volume 591A, 5-5 (2016/7-1)

ATLASGAL: A Galaxy-wide sample of dense filamentary structures.

LI G.-X., URQUHART J.S., LEURINI S., CSENGERI T., WYROWSKI F., MENTEN K.M. and SCHULLER F.

Abstract (from CDS):

Context. Filamentary structures are ubiquitous in the interstellar medium. Investigating their connection to the large-scale structure of the Galaxy and their role in star formation is leading to a paradigm shift in our understanding of star formation.
Aims. We study the properties of filamentary structures from the ATLASGAL survey, which is the largest and most sensitive systematic ground-based survey of the inner Galactic plane at submillimeter wavelengths.
Methods. We use the DisPerSE algorithm to identify spatially coherent structures located across the inner-Galaxy (300°<l<60° and |b|<1.5). As a result we produce a catalogue of ∼1800 structures; these were then independently classified by the five lead authors into one of the following types: marginally resolved, elongated structures, filaments, network of filaments and complexes. This resulted in the identification of 517 filamentary structures. We determine their physical properties and investigate their overall Galactic distribution.
Results. We find that almost 70% of the total 870 µm flux associated with these structures resides in filaments and networks of filaments and we estimate that they are likely to be associated with a similar fraction of the mass. Correlating these structures with tracers of massive star formation we also find that a similar fraction of the massive star forming clumps are associated with filaments and networks of filaments, which highlights the importance of these types of structures to star formation in the Galaxy. 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 103M, a mean length of ∼6pc and a mass-to-length ratio of (M/L)∼200-2000M/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.
Conclusions. 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.

Abstract Copyright: © ESO, 2016

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

VizieR on-line data: <Available at CDS (J/A+A/591/A5): table1.dat table3.dat refs.dat list.dat fits_24um/* fits_i1/* fits_i4/* fits_atlasgal/* fits_skeleton/* images/*>

Nomenclature: Table 1: [LUL2016] GLLL.lll+BB.bbb N=517.

Status in Simbad:  could be processed

Simbad objects: 42

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Number of rows : 42

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10705 1
2 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3722 4
3 [ZBG2015] BC G332.21-00.04 ISM 16 15.1 -50 57           ~ 2 1
4 GAL 332.80-00.60 HII 16 19 47 -51 04.1           ~ 91 1
5 [ZBG2015] BC G335.31-00.29 ISM 16 29.8 -48 56           ~ 2 1
6 NAME Nessie Nebula DNe 16 43 -46.7           ~ 21 0
7 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11246 0
8 [ZBG2015] BC G004.14-00.02 ISM 17 55.2 -25 24           ~ 2 1
9 [CCE98b] 011.11-0.12 Cld 18 10.5 -19 23           ~ 85 1
10 [CPA2006] N2 bub 18 11 03.3 -19 51 47           ~ 9 0
11 M 16 OpC 18 18 48 -13 48.4   6.58 6.0     ~ 926 2
12 W 37 Rad 18 18 50.1 -13 46 44           ~ 22 1
13 [CPA2006] N18 bub 18 22 29 -14 35.7           ~ 7 0
14 [ZBG2015] BC G018.88-00.09 ISM 18 25.7 -12 31           ~ 2 1
15 GRS G018.88 -00.48 Rad 18 27 10.73 -12 40 07.5           ~ 26 0
16 [WTG2015] G24 ISM 18 33.3 -07 43           ~ 5 1
17 [ZBG2015] BC G025.24-00.45 ISM 18 39.0 -07 03           ~ 3 1
18 [ZBG2015] BC G026.94-00.30 ISM 18 41.5 -05 28           ~ 3 1
19 [WTG2015] G28 ISM 18 44.7 -03 55           ~ 5 1
20 [WTG2015] G29 ISM 18 45.8 -03 30           ~ 5 1
21 SNR G030.8-00.0 SNR 18 47 32 -01 56.5           ~ 430 0
22 GAL 032.02+00.06 ? 18 49.6 -00 47           ~ 6 0
23 [CPA2006] N59 bub 18 52 02.3 +00 04 34           ~ 7 0
24 [CPA2006] N63 bub 18 56 03 +01 20.6           ~ 3 0
25 SNR G034.6-00.5 SNR 18 56 10.650 +01 13 21.30           ~ 807 2
26 NAME Sgr Arm PoG 19 00 -30.0           ~ 506 1
27 W 49 SFR 19 10 20 +09 07.7           ~ 504 1
28 [WTG2015] G47 ISM 19 16.7 +12 40           ~ 8 1
29 [WTG2015] G49 ISM 19 23.0 +14 17           ~ 5 1
30 W 51 SNR 19 23 50 +14 06.0           ~ 1130 1
31 [BAB2012] G52L HII 19 25.3 +17 09           ~ 5 0
32 [RHT2014] GMF G018.0-16.8 ISM 19 27 -20.6           ~ 4 0
33 LMH 51 Rad 19 29.3 +18 12           ~ 11 0
34 [RHT2014] GMF G020.0-17.9 ISM 19 35 -19.2           ~ 5 0
35 [RHT2014] GMF G026.7-25.4 ISM 20 14 -16.4           ~ 2 0
36 [RHT2014] GMF G038.1-32.4b ISM 20 57 -10.2           ~ 3 0
37 [RHT2014] GMF G038.1-32.4a ISM 20 57 -10.2           ~ 3 0
38 [RHT2014] GMF G041.0-41.3 ISM 21 33 -12.0           ~ 3 0
39 [RHT2014] GMF G054.0-52.0 ISM 22 29 -09.3           ~ 3 0
40 NAME Gould Belt PoG ~ ~           ~ 700 1
41 NAME Sct-Cen PoG ~ ~           ~ 125 0
42 NAME Local Arm reg ~ ~           ~ 354 0

    Equat.    Gal    SGal    Ecl

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2020.02.18-04:13:42

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