2007ApJ...654..338R

Query : 2007ApJ...654..338R

2007ApJ...654..338R - Astrophys. J., 654, 338-346 (2007/January-1)

Spitzer observations of the giant molecular cloud W3.

RUCH G.T., JONES T.J., WOODWARD C.E., POLOMSKI E.F., GEHRZ R.D. and MEGEATH S.T.

Abstract (from CDS):

We present new images of the giant molecular cloud W3 obtained with the Infrared Array Camera (IRAC) and the Multiband Imaging Photometer for Spitzer (MIPS) on board the Spitzer Space Telescope. The images encompass the star forming regions W3 Main, W3(OH), and a region that we refer to as the Central Cluster, which encloses the emission nebula IC 1795. We present a star count analysis of the point sources detected in W3. The star count analysis shows that the stellar population of the Central Cluster, when compared to that in the background, contains an over density of sources. The Central Cluster also contains an excess of sources with colors consistent with Class II young stellar objects (YSOs). An analysis of the color-color diagrams also reveals a large number of Class II YSOs in the Central Cluster. Our results suggest that an earlier epoch of star formation created the Central Cluster, created a cavity, and triggered the active star formation in the W3 Main and W3(OH) regions. We also detect a new outflow and its candidate exciting star.

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Journal keyword(s): Infrared: ISM - Infrared: Stars - ISM: Individual: Alphanumeric: W3 - Stars: Formation - Stars: Pre-Main-Sequence - Stars: Statistics

VizieR on-line data: <Available at CDS (J/ApJ/654/338): table3.dat>

Nomenclature: Table 3: [RJW2007] NNN (Nos 1-293). Fig.9, Table 5: [RJW2007] Source N=1, [RJW2007] Knot A (Nos A-B), [RJW2007] Loop A (Nos A-B).

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 W 3j HII 02 25 27.32 +62 03 43.4           ~ 19 1
2 2MASS J02252738+6203432 * 02 25 27.3735722808 +62 03 43.121827224   18.333 16.418     O9.5IV-V 15 2
3 MPCM J022530.99+620620.9 HII 02 25 31.18 +62 06 24.5           O8V-B0.5V 107 1
4 W 3h HII 02 25 32.00 +62 06 59.3           ~ 29 1
5 2MASS J02253258+6206596 Y*O 02 25 32.5801367424 +62 06 59.531472504     18.65   14.70 B0.5V-B2V 11 1
6 NAME W3 IRS 5 Y*O 02 25 40.54 +62 05 51.4           B1 367 0
7 2MASS J02254173+6206244 * 02 25 41.7295815504 +62 06 24.373771380           B0V-B1V 11 0
8 2MASS J02254334+6206154 Y*O 02 25 43.3302484800 +62 06 15.387396264     19.41 17.68 15.92 O8V-O9V 26 0
9 IC 1795 HII 02 25 43.5 +62 06 13           ~ 247 0
10 MPCM J022544.35+620611.7 HII 02 25 44.26 +62 06 16.2           O6.5V-O7.5V 38 0
11 2MASS J02254485+6203413 Y*O 02 25 44.8467122304 +62 03 41.200921692   18.097 15.91 14.19 12.59 B0.5V-B2V 18 2
12 W 3k HII 02 25 44.9 +62 03 41           ~ 21 1
13 2MASS J02254709+6206131 * 02 25 47.0848638600 +62 06 13.078656000           B0V-B1V 9 0
14 [RMP2011] J022554.31+620408.76 Y*O 02 25 54.31 +62 04 08.8           ~ 3 0
15 NAME W 3 North HII 02 26 51.14 +62 15 47.2           ~ 93 0
16 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 1064 2
17 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 1064 3
18 NAME Heart Nebula HII 02 32.7 +61 27           ~ 336 1
19 NAME Per Arm PoG 03 30 +45.0           ~ 1672 0
20 NAME HH 46-47 HH 08 25 43.6 -51 00 36           ~ 216 2

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