2013A&A...550A..38P


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST02:31:59

2013A&A...550A..38P - Astronomy and Astrophysics, volume 550A, 38-38 (2013/2-1)

Herschel view of the Taurus B211/3 filament and striations: evidence of filamentary growth?

PALMEIRIM P., ANDRE P., KIRK J., WARD-THOMPSON D., ARZOUMANIAN D., KOENYVES V., DIDELON P., SCHNEIDER N., BENEDETTINI M., BONTEMPS S., DI FRANCESCO J., ELIA D., GRIFFIN M., HENNEMANN M., HILL T., MARTIN P.G., MEN'SHCHIKOV A., MOLINARI S., MOTTE F., NGUYEN LUONG Q., NUTTER D., PERETTO N., PEZZUTO S., ROY A., RYGL K.L.J., SPINOGLIO L. and WHITE G.L.

Abstract (from CDS):

We present first results from the Herschel Gould Belt survey for the B211/L1495 region in the Taurus molecular cloud. Thanks to their high sensitivity and dynamic range, the Herschel images reveal the structure of the dense, star-forming filament B211 with unprecedented detail, along with the presence of striations perpendicular to the filament and generally oriented along the magnetic field direction as traced by optical polarization vectors. Based on the column density and dust temperature maps derived from the Herschel data, we find that the radial density profile of the B211 filament approaches power-law behavior, ρ∝r–2.0±0.4, at large radii and that the temperature profile exhibits a marked drop at small radii. The observed density and temperature profiles of the B211 filament are in good agreement with a theoretical model of a cylindrical filament undergoing gravitational contraction with a polytropic equation of state: P∝ργ and T∝ργ–1, with γ=0.97±0.01<1 (i.e., not strictly isothermal). The morphology of the column density map, where some of the perpendicular striations are apparently connected to the B211 filament, further suggests that the material may be accreting along the striations onto the main filament. The typical velocities expected for the infalling material in this picture are ∼0.5-1km/s, which are consistent with the existing kinematical constraints from previous CO observations.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: individual objects: B211 - ISM: clouds - ISM: structure - evolution - submillimeter: ISM

Simbad objects: 14

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Number of rows : 14

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 * alf UMi cC* 02 31 49.09456 +89 15 50.7923 3.00 2.62 2.02 1.53 1.22 F8Ib 609 2
2 Barnard 211 DNe 04 17 35 +27 43.1           ~ 91 0
3 LDN 1495 DNe 04 18.1 +27 37           ~ 289 1
4 Barnard 213 DNe 04 20 51 +27 16.3           ~ 153 0
5 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3478 0
6 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1359 0
7 LDN 1517 DNe 04 55 45 +30 33.0           ~ 97 0
8 NAME Musca Cld 12 23 -71.3           ~ 156 0
9 NAME the Pipe Nebula DNe 17 30 -25.0           ~ 333 1
10 NAME Aql Rift DNe 18 32 -01.0           ~ 234 1
11 NAME Cyg X Cld 20 28 41 +41 10.2           ~ 618 1
12 GRS G081.70 +00.50 SFR 20 39 01.6 +42 19 38           O4.5 944 0
13 IC 5146 OpC 21 53 24 +47 16.0           ~ 385 2
14 NAME Aql Region reg ~ ~           ~ 304 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-02:31:59

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