2009ApJ...700..506S

Query : 2009ApJ...700..506S

2009ApJ...700..506S - Astrophys. J., 700, 506-522 (2009/July-3)

Spitzer observations of the H II region NGC 2467: an analysis of triggered star formation.

SNIDER K.D., HESTER J.J., DESCH S.J., HEALY K.R. and BALLY J.

Abstract (from CDS):

We present new Spitzer Space Telescope observations of the region NGC 2467, and use these observations to determine how the environment of an H II region affects the process of star formation. Our observations comprise IRAC (3.6, 4.5, 5.8, and 8.0 µm) and MIPS (24 µm) maps of the region, covering approximately 400 arcmin2. The images show a region of ionized gas pushing out into the surrounding molecular cloud, powered by an O6V star and two clusters of massive stars in the region. We have identified as candidate young stellar objects (YSOs) 45 sources in NGC 2467 with infrared excesses in at least two mid-infrared colors. We have constructed color-color diagrams of these sources and have quantified their spatial distribution within the region. We find that the YSOs are not randomly distributed in NGC 2467; rather, over 75% of the sources are distributed at the edge of the H II region, along ionization fronts driven by the nearby massive stars. The high fraction of YSOs in NGC 2467 that are found in proximity to gas that has been compressed by ionization fronts supports the hypothesis that a significant fraction of the star formation in NGC 2467 is triggered by the massive stars and the expansion of the H II region. At the current rate of star formation, we estimate at least 25%-50% of the total population of YSOs formed by this process.

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Journal keyword(s): ISM: individual: NGC 2467 - stars: formation - stars: pre-main sequence

Nomenclature: Tables 1, 3-4: [SHD2009] NN (Nos 1-45).

Simbad objects: 67

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Number of rows : 67
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 NGC 346 Cl* 00 59 04.4000 -72 10 39.000           ~ 547 0
3 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 1064 3
4 NAME Heart Nebula HII 02 32.7 +61 27           ~ 336 1
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
6 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1708 1
7 NAME Ori I As* 05 38 -02.8           ~ 653 0
8 NGC 2244 OpC 06 32 06.9 +04 54 19           ~ 673 1
9 NAME Rosette Nebula HII 06 32 26.76 +04 47 37.1           ~ 522 1
10 2MASS J07521633-2623143 Y*? 07 52 16.3247806080 -26 23 14.218544256           ~ 1 0
11 2MASS J07521781-2625210 Y*? 07 52 17.8116981552 -26 25 20.826848712           ~ 2 0
12 NGC 2467 OpC 07 52 18 -26 25.7           ~ 190 1
13 [SHD2009] 16 Y*? 07 52 20.15 -26 27 54.1           ~ 1 0
14 HD 64315 EB* 07 52 20.2841727949 -26 25 46.683038109 8.76 9.49 9.24 9.63 8.86 O5.5Vz+O7V 124 1
15 2MASS J07522131-2627103 Y*? 07 52 21.3153370752 -26 27 10.101490704           ~ 2 0
16 2MASS J07522326-2626505 Y*? 07 52 23.2651294560 -26 26 50.346405204           ~ 2 0
17 2MASS J07522402-2625290 Y*? 07 52 24.0204021960 -26 25 28.866065700           ~ 2 0
18 2MASS J07522751-2627212 Y*? 07 52 27.515 -26 27 21.28           ~ 2 0
19 2MASS J07523164-2622072 Y*O 07 52 31.6398406152 -26 22 07.111663608 18.019 17.580 16.771   15.144 ~ 3 0
20 2MASS J07523202-2622375 Y*O 07 52 32.0172382968 -26 22 37.382066112           ~ 3 0
21 2MASS J07523213-2622304 Y*O 07 52 32.1335904288 -26 22 30.248036364           ~ 3 0
22 2MASS J07523349-2626483 Y*O 07 52 33.4924137312 -26 26 48.153316164     17.014   14.935 ~ 5 0
23 2MASS J07523444-2626347 Y*O 07 52 34.446 -26 26 34.71     19.217     ~ 2 0
24 2MASS J07523444-2626443 Y*? 07 52 34.450 -26 26 44.33           ~ 1 0
25 2MASS J07523554-2626347 Y*O 07 52 35.5369063200 -26 26 34.528478748     18.742   16.033 ~ 3 0
26 2MASS J07523554-2625083 Y*O 07 52 35.5494917688 -26 25 08.114733948     19.158   16.724 ~ 3 0
27 2MASS J07523555-2625445 Y*? 07 52 35.5498345584 -26 25 44.409196884           ~ 5 0
28 2MASS J07523586-2621584 Y*O 07 52 35.8594784232 -26 21 58.257039816           ~ 5 0
29 2MASS J07523621-2625478 Y*O 07 52 36.2175030456 -26 25 47.732397924     19.170   17.266 ~ 3 0
30 2MASS J07523639-2625563 Y*? 07 52 36.390 -26 25 56.37           ~ 2 0
31 2MASS J07523645-2626115 Y*O 07 52 36.4457759280 -26 26 11.371784712     22.120   19.020 ~ 3 0
32 2MASS J07523678-2623232 Y*O 07 52 36.786 -26 23 23.20           ~ 2 0
33 [SHD2009] 4 Y*? 07 52 38.00 -26 21 31.9           ~ 1 0
34 Cl* Haffner 18 LSS 32 * 07 52 38.5672478592 -26 23 09.878200116   15.071 14.413     B1V 12 0
35 Cl* Haffner 18 MCB 43 * 07 52 39.1365157776 -26 23 22.385210748 11.84 12.42 12.12 11.92   O8V 22 0
36 2MASS J07524000-2625329 Y*? 07 52 39.9971573784 -26 25 32.815116480           ~ 3 0
37 Cl Haffner 18 OpC 07 52 40.0 -26 23 28   10.09 9.3     ~ 60 1
38 [FM74] 3057 ** 07 52 40.957704 -26 23 48.13116   15.23 14.67 14.503   B6V 7 0
39 2MASS J07524222-2622509 Y*O 07 52 42.2274106296 -26 22 50.750731884     19.324   17.073 ~ 3 0
40 2MASS J07524281-2625458 Y*O 07 52 42.8071415736 -26 25 45.768147204 18.315 17.625 16.785   15.639 ~ 5 0
41 WRAY 15-101 Em* 07 52 42.8886798192 -26 24 12.784401396 11.39 12.11 11.92 11.97   B0.5V(n) 29 0
42 Cl* Haffner 19 FM 4040 * 07 52 43.1664015048 -26 17 15.838338480   17.264 16.264     ~ 5 0
43 Cl* Haffner 18 LSS 11 * 07 52 43.6615249464 -26 24 20.052309960   15.871 15.373     ~ 2 0
44 [SHD2009] 7 Y*O 07 52 44.447 -26 22 59.31           ~ 2 0
45 NGC 2467 39 * 07 52 44.5245525048 -26 17 26.827273284 11.82 12.54 12.40 12.19 12.05 ~ 17 0
46 [SHD2009] 9 Y*? 07 52 45.000 -26 24 27.83           ~ 1 0
47 2MASS J07524524-2624222 Y*? 07 52 45.250 -26 24 22.28           ~ 1 0
48 Cl Haffner 19 OpC 07 52 45.9 -26 16 32           ~ 61 0
49 [SHD2009] 10 Y*? 07 52 46.68 -26 23 59.8           ~ 1 0
50 Cl* Haffner 19 MCD 63 * 07 52 47.1891666480 -26 15 58.410494928   14.87 14.43     ~ 4 0
51 2MASS J07524787-2622230 Y*? 07 52 47.874 -26 22 23.02           ~ 2 0
52 Cl* Haffner 19 MC 48 * 07 52 49.7206736304 -26 16 33.464347068   14.96 13.93     ~ 6 0
53 2MASS J07525025-2626404 Y*? 07 52 50.2576274088 -26 26 40.317617148           ~ 5 0
54 Cl* Haffner 19 MCD 140 * 07 52 50.320 -26 18 08.81   19.69 18.42     ~ 2 0
55 2MASS J07525160-2625425 Y*? 07 52 51.603 -26 25 42.57           ~ 1 0
56 Cl* Haffner 19 MCD 24b * 07 52 52.78 -26 15 17.6   21.87 19.11     ~ 2 0
57 2MASS J07525586-2622393 Y*? 07 52 55.8648339744 -26 22 39.371335968           ~ 4 0
58 2MASS J07530160-2619593 Y*? 07 53 01.6065950064 -26 19 59.471580684           ~ 1 0
59 GUM 29 HII 10 24 14.6 -57 46 58           ~ 219 0
60 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 565 1
61 NAME Upper Centaurus Lupus MGr 15 24 -41.9           ~ 567 1
62 NAME Upper Sco Association As* 16 12 -23.4           ~ 1586 1
63 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1
64 M 20 OpC 18 02 42 -22 58.3           ~ 456 1
65 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1
66 NAME SFO 37 IR Stellar Group Cl* 21 40 29 +56 36.0           ~ 2 0
67 NAME I Lac As* 22 41 +38.5           ~ 158 0

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