2004ApJ...606..333T


Query : 2004ApJ...606..333T

2004ApJ...606..333T - Astrophys. J., 606, 333-340 (2004/May-1)

N2H+ observations of molecular cloud cores in Taurus.

TATEMATSU K., UMEMOTO T., KANDORI R. and SEKIMOTO Y.

Abstract (from CDS):

N2H+ observations of molecular cloud cores in Taurus with the Nobeyama 45 m radio telescope are reported. We compare cores with young stars to cores without young stars. The differences in core radius, line width, and core mass are small. Line width is dominated by thermal motions in both cases. N2H+ maps show that the intensity distribution does not differ much between cores without stars and those with stars. This is in contrast to the result previously obtained in H13CO+ toward Taurus molecular cloud cores. A larger degree of depletion of H13CO+ in starless cores is one possible explanation for this difference. We studied the physical state of molecular cloud cores in terms of ``critical pressure'' for the surface (external) pressure. There is no systematic difference between starless cores and cores with stars in this analysis. Both are not far from the critical equilibrium state. We suggest that molecular cloud cores in which thermal support dominates evolve toward star formation by keeping close to the critical equilibrium state. This result is in contrast to that obtained in the intermediate-mass star-forming region OMC-2/3, where molecular cloud cores evolve by decreasing the critical pressure (dissipating turbulence). We investigate the radial distribution of the integrated intensity. Cores with stars are found to have shallow (-1.8 to -1.6) power-law density profiles.

Abstract Copyright:

Journal keyword(s): ISM: Clouds - ISM: Individual: Name: Taurus Cloud Complex - ISM: Molecules - ISM: Structure - Radio Lines: ISM - Stars: Formation

Nomenclature: Table 1: [MOH94] NNa (No. 8b) added.

Simbad objects: 21

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Number of rows : 21
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME [BM89] L1495 PoC 04 14 08.2 +28 09 31           ~ 170 0
2 LDN 1495 DNe 04 18.1 +27 37           ~ 336 1
3 [MOH94] 1 PoC 04 18 12.7 +27 36 00           ~ 4 0
4 HGBS J041937.7+271526 cor 04 19 37.6 +27 15 31           ~ 16 0
5 [MOH94] 7 PoC 04 19 42.4 +27 13 24           ~ 4 0
6 IRAS 04166+2706 Y*O 04 19 42.62736 +27 13 38.4312           ~ 127 0
7 [MOH94] 8b PoC 04 19 52.2 +27 11 45           ~ 3 0
8 [MOH94] 8 PoC 04 19 57.3 +27 10 02           ~ 5 0
9 IRAS 04169+2702 Y*O 04 19 58.44936 +27 09 57.0672           K0-M4 111 1
10 LDN 1521F DNe 04 28 39.3 +26 51 43           ~ 195 1
11 Bad 16 Y*O 04 30 50.2774891944 +23 00 08.757461592       14.95   F1 139 0
12 LDN 1551 DNe 04 31 30.0 +18 12 30           ~ 794 1
13 RAFGL 5123 Y*O 04 31 34.07736 +18 08 04.9020           K3V/M3III 842 0
14 2MASS J04314444+1808315 Y*O 04 31 44.44680 +18 08 31.5384           ~ 163 0
15 LDN 1521 DNe 04 33.1 +26 06           ~ 56 0
16 LDN 1527 DNe 04 39 53 +25 45.0           ~ 581 0
17 IRAS 04368+2557 Y*O 04 39 53.97816 +26 03 09.6804           ~ 262 0
18 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4051 0
19 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2193 1
20 OMC 3 MoC 05 35 20.0 -05 01 00           ~ 254 1
21 OMC 2 MoC 05 35 27 -05 10.1           ~ 433 1

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2022.12.06-07:42:26

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