2013ApJ...772...22Y


Query : 2013ApJ...772...22Y

2013ApJ...772...22Y - Astrophys. J., 772, 22 (2013/July-3)

Unveiling the evolutionary sequence from infalling envelopes to keplerian disks around low-mass protostars.

YEN H.-W., TAKAKUWA S., OHASHI N. and HO P.T.P.

Abstract (from CDS):

We performed Submillimeter Array observations in the C18O (2-1) emission line toward six Class 0 and I protostars to study rotational motions of their surrounding envelopes and circumstellar material on 100-1000 AU scales. C18O (2-1) emission with intensity peaks located at the protostellar positions is detected toward all six sources. The rotational velocities of the protostellar envelopes as a function of radius were measured from the position-velocity diagrams perpendicular to the outflow directions passing through the protostellar positions. Two Class 0 sources, B335 and NGC 1333 IRAS 4B, show no detectable rotational motion, while L1527 IRS (Class 0/I) and L1448-mm (Class 0) exhibit rotational motions with radial profiles of Vrot∝r.–1.0±0.2 and ∝r.–1.0±0.1, respectively. The other Class I sources, TMC-1A and L1489 IRS, exhibit the fastest rotational motions among the sample, and their rotational motions have flatter radial profiles of Vrot∝r –0.6±0.1 and ∝r –0.5±0.1, respectively. The rotational motions with the radial dependence of ∼r.–1 can be interpreted as rotation with a conserved angular momentum in a dynamically infalling envelope, while those with the radial dependence of ∼r –0.5 can be interpreted as Keplerian rotation. These observational results demonstrate categorization of rotational motions from infalling envelopes to Keplerian-disk formation. Models of the inside-out collapse where the angular momentum is conserved are discussed and compared with our observational results.

Abstract Copyright:

Journal keyword(s): circumstellar matter - ISM: individual (B335, NGC 1333 IRAS 4B, L1448-mm, L1527 IRS, TMC-1A, L1489 IRS) - ISM: kinematics and dynamics - ISM: molecules - stars: formation

Simbad objects: 32

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Number of rows : 32
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 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3680 3
2 [SDA2014] West4 Y*O 03 25 38.83 +30 44 06.2           ~ 245 1
3 IRAS F03226+3033 Y*O 03 25 38.83 +30 44 06.2           ~ 319 0
4 [JCC87] IRAS 2A Y*O 03 28 55.55 +31 14 36.7           ~ 420 3
5 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 638 1
6 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 473 0
7 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 573 0
8 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1154 0
9 HH 211 cor 03 43 56.52 +32 00 52.8           ~ 314 0
10 IRAS 04016+2610 Y*O 04 04 43.07064 +26 18 56.3904           ~ 240 0
11 3C 111 Sy1 04 18 21.2773655604 +38 01 35.801523843   19.75 18.05     ~ 879 1
12 RAFGL 5123 Y*O 04 31 34.07736 +18 08 04.9020           K3V/M3III 823 0
13 2MASS J04314444+1808315 Y*O 04 31 44.44680 +18 08 31.5384           ~ 156 0
14 IRAS 04365+2535 Y*O 04 39 35.19360 +25 41 44.7252           ~ 251 0
15 IRAS 04368+2557 Y*O 04 39 53.97816 +26 03 09.6804           ~ 248 0
16 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3765 0
17 HH 212 HH 05 43 51.41 -01 02 53.1           ~ 310 1
18 HH 111 HH 05 51 44.2 +02 48 34           ~ 393 0
19 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5467 1
20 3C 279 Bla 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2811 2
21 Elia 2-29 Y*O 16 27 09.43032 -24 37 18.7716           ~ 273 1
22 IRAS 16285-2355 Y*O 16 31 35.65752 -24 01 29.4708           ~ 111 0
23 HH 119A HH 19 36 51.57 +07 34 10.4           ~ 8 0
24 LDN 663 DNe 19 36 55 +07 34.4           ~ 577 0
25 HH 119B HH 19 36 57.26 +07 34 06.3           ~ 11 0
26 HH 119C HH 19 37 04.79 +07 34 06.8           ~ 11 0
27 HH 119D HH 19 37 05.82 +07 34 07.2           ~ 4 0
28 HH 119E HH 19 37 09.19 +07 34 06.5           ~ 4 0
29 HH 119F HH 19 37 09.39 +07 33 46.0           ~ 4 0
30 V* V1142 Aql Mi* 19 37 10.6581469268 +07 36 27.143670437           ~ 15 0
31 HH 375 Y*O 20 39 06.2 +68 02 15           ~ 170 0
32 3C 454.3 Bla 22 53 57.74798 +16 08 53.5611   16.57 16.10 15.22   ~ 2602 2

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2021.09.20-22:46:43

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