2015MNRAS.450.4043W


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.28CET10:53:08

2015MNRAS.450.4043W - Mon. Not. R. Astron. Soc., 450, 4043-4049 (2015/July-2)

Large-scale filaments associated with Milky Way spiral arms.

WANG K., TESTI L., GINSBURG A., WALMSLEY C.M., MOLINARI S. and SCHISANO E.

Abstract (from CDS):

The ubiquity of filamentary structure at various scales throughout the Galaxy has triggered a renewed interest in their formation, evolution, and role in star formation. The largest filaments can reach up to Galactic scale as part of the spiral arm structure. However, such large-scale filaments are hard to identify systematically due to limitations in identifying methodology (i.e. as extinction features). We present a new approach to directly search for the largest, coldest, and densest filaments in the Galaxy, making use of sensitive Herschel HI-GAL (Herschel Infrared Galactic Plane Survey) data complemented by spectral line cubes. We present a sample of the nine most prominent Herschel filaments, including six identified from a pilot search field plus three from outside the field. These filaments measure 37-99 pc long and 0.6-3.0 pc wide with masses (0.5-8.3)x104 M, and beam-averaged (28 arcsec, or 0.4-0.7 pc) peak H2 column densities of (1.7-9.3)x 1022/cm2. The bulk of the filaments are relatively cold (17-21 K), while some local clumps have a dust temperature up to 25-47 K. All the filaments are located within ≲ 60 pc from the Galactic mid-plane. Comparing the filaments to a recent spiral arm model incorporating the latest parallax measurements, we find that 7/9 of them reside within arms, but most are close to arm edges. These filaments are comparable in length to the Galactic scaleheight and therefore are not simply part of a grander turbulent cascade.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): catalogues - stars: formation - ISM: clouds - ISM: structure - Galaxy: structure

Nomenclature: Table 1: [WTG2015] GNN N=9 among (Nos G11-G239).

Simbad objects: 25

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Number of rows : 25

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9661 1
2 NAME Per Arm PoG 03 30 +45.0           ~ 1287 0
3 LDN 1495 DNe 04 18.1 +27 37           ~ 299 1
4 Barnard 213 DNe 04 20 51 +27 16.3           ~ 162 0
5 NAME Nessie Nebula DNe 16 43 -46.7           ~ 22 0
6 [WTG2015] G339 ISM 16 43.1 -46 41           ~ 2 1
7 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3581 3
8 [WTG2015] G11 ISM 18 10.5 -19 23           ~ 4 1
9 [CCE98b] 011.11-0.12 Cld 18 10.5 -19 23           ~ 86 1
10 [WTG2015] G24 ISM 18 33.3 -07 43           ~ 7 1
11 [WTG2015] G26 ISM 18 36.6 -05 28           ~ 3 1
12 MSXDC G028.53-0.25 DNe 18 44 17.1 -03 59 37           ~ 17 0
13 [WTG2015] G28 ISM 18 44.7 -03 55           ~ 5 1
14 [WTG2015] G29 ISM 18 45.8 -03 30           ~ 5 1
15 NAME Sgr Arm PoG 19 00 -30.0           ~ 541 1
16 [WTG2015] G47 ISM 19 16.7 +12 40           ~ 8 1
17 [WTG2015] G49 ISM 19 23.0 +14 17           ~ 5 1
18 NAME W 51 Main reg 19 23 43.8 +14 30 37           ~ 132 0
19 W 51 SNR 19 23 50 +14 06.0           ~ 1169 1
20 [WTG2015] G64 ISM 19 55.1 +27 21           ~ 3 1
21 NAME Outer Arm PoG 21 48 +69.4           ~ 229 0
22 NAME Sct-Cen PoG ~ ~           ~ 144 0
23 NAME Scutum Spiral Arm PoG ~ ~           ~ 287 0
24 NAME Gould Belt PoG ~ ~           ~ 737 1
25 NAME Local Arm reg ~ ~           ~ 390 0

    Equat.    Gal    SGal    Ecl

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