2010ApJ...719..550M


Query : 2010ApJ...719..550M

2010ApJ...719..550M - Astrophys. J., 719, 550-560 (2010/August-2)

Deep near-infrared imaging of the ρ Oph cloud core: clues to the origin of the lowest-mass brown dwarfs.

MARSH K.A., PLAVCHAN P., KIRKPATRICK J.D., LOWRANCE P.J., CUTRI R.M. and VELUSAMY T.

Abstract (from CDS):

A search for young substellar objects in the ρ Oph cloud core region has been made with the aid of multiband profile-fitting point-source photometry of the deep-integration Combined Calibration Scan images of the 2MASS extended mission in the J, H, and Ksbands, and Spitzer IRAC images at 3.6, 4.5, 5.8, and 8.0 µm. The field of view of the combined observations was 1° x9{farcm}3, and the 5σ limiting magnitude at J was 20.5. Comparison of the observed spectral energy distributions with the predictions of the COND and DUSTY models, for an assumed age of 1 Myr, supports the identification of many of the sources with brown dwarfs and enables the estimation of effective temperature, Teff. The cluster members are then readily distinguishable from background stars by their locations on a plot of flux density versus Teff. The range of estimated Teff values extends down to ∼750 K which, based on the COND model, would suggest the presence of objects of sub-Jupiter mass. The results also suggest that the mass function for the ρ Oph cloud resembles that of the σ Orionis cluster based on a recent study, with both rising steadily toward lower masses. The other main result from our study is the apparent presence of a progressive blueward skew in the distribution of J - H and H - Kscolors, such that the blue end of the range becomes increasingly bluer with increasing magnitude. We suggest that this behavior might be understood in terms of the "ejected stellar embryo" hypothesis, whereby some of the lowest-mass brown dwarfs could escape to locations close to the front edge of the cloud, and thereby be seen with less extinction.

Abstract Copyright:

Journal keyword(s): brown dwarfs - infrared: stars - stars: low-mass - stars: pre-main sequence

VizieR on-line data: <Available at CDS (J/ApJ/719/550): table1.dat>

Nomenclature: Table 1: [MPK2010b] NNNNN N=165 among (Nos 10-14819).

Simbad objects: 168

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Number of rows : 168
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4412 0
2 NAME sig Ori Cluster OpC 05 38 42 -02 36.0           ~ 567 0
3 [MPK2010b] 4220 BD? 16 26 55.40 -24 21 17.9           ~ 2 0
4 [MPK2010b] 1518 BD? 16 26 55.52 -24 28 20.9           ~ 2 0
5 [MPK2010b] 6574 BD? 16 26 55.93 -24 21 18.0           ~ 1 0
6 BKLT J162656-241622 Y*? 16 26 56.2601143296 -24 16 19.368849684           ~ 3 0
7 [MPK2010b] 4795 BD? 16 26 56.30 -24 21 31.5           ~ 2 0
8 SONYC RhoOph-1 BD* 16 26 56.33520 -24 42 37.7244           L0 8 0
9 CFHTWIR-Oph 53 BD* 16 26 56.36976 -24 41 20.4576           L3? 11 0
10 [MPK2010b] 6249 BD? 16 26 56.71 -24 28 17.3           ~ 2 0
11 BKLT J162656-241353 TT* 16 26 56.7836190744 -24 13 51.537326592       18.46 16.29 K7 33 0
12 BBRCG 16 TT* 16 26 56.91984 -24 28 37.0740           ~ 17 0
13 [MPK2010b] 3976 BD? 16 26 57.23 -24 55 44.4           ~ 1 0
14 WL 21 Y*O 16 26 57.33000 -24 35 38.8032           M6 45 0
15 BKLT J162657-244947 Y*? 16 26 57.4436408016 -24 49 49.440092232       17.56 15.78 K4-K5 9 0
16 [MPK2010b] 6248 BD? 16 26 57.99 -24 56 30.8           ~ 1 0
17 YLW 1C Or* 16 26 58.39608 -24 21 29.9808           M6 35 0
18 WL 14 Or* 16 26 59.04984 -24 35 56.8788           ~ 53 0
19 [MPK2010b] 6538 BD? 16 26 59.45 -24 13 42.9           ~ 1 0
20 [MPK2010b] 7614 BD? 16 27 00.01 -24 24 21.0           ~ 2 0
21 [GY92] 178 Y*? 16 27 00.7200253728 -24 46 27.279135768           ~ 4 0
22 VSSG 8 TT* 16 27 01.61856 -24 21 37.0404           ~ 16 0
23 [GY92] 183 Y*? 16 27 01.94280 -24 22 06.1536           ~ 4 0
24 [MPK2010b] 6746 BD? 16 27 02.37 -24 58 07.5           ~ 1 0
25 BKLT J162702-244633 Y*? 16 27 02.6656935816 -24 46 34.591290744           ~ 3 0
26 VSSG 9 Y*? 16 27 02.8591055400 -24 18 54.690905664           ~ 11 0
27 [GY92] 188 Y*O 16 27 03.00720 -24 26 14.6976           ~ 29 1
28 BKLT J162703-242007 Y*O 16 27 03.59088 -24 20 05.4456           M1.5 23 0
29 VSSG 31 Or* 16 27 04.10688 -24 28 29.9136           ~ 61 1
30 [GY92] 193 Y*O 16 27 04.5156704856 -24 42 59.671949976       16.69 14.97 K6-M1 35 0
31 [GY92] 194 Y*O 16 27 04.5603052200 -24 42 14.017947300       17.54 15.66 K8-M0 32 0
32 [MPK2010b] 5598 BD? 16 27 04.57 -24 19 44.5           ~ 2 0
33 [GY92] 195 Or* 16 27 04.57464 -24 27 15.6636           ~ 33 1
34 [MPK2010b] 5369 BD? 16 27 04.88 -24 55 42.9           ~ 1 0
35 VSSG 21 Y*O 16 27 05.1720884784 -24 20 07.728776988           ~ 18 1
36 [MPK2010b] 8518 BD? 16 27 05.46 -24 49 05.0           ~ 1 0
37 BKLT J162705-244013 Y*O 16 27 05.67576 -24 40 13.0908           ~ 18 0
38 2MASS J16270591-2459376 Y*? 16 27 05.9165693064 -24 59 37.724013888           ~ 3 0
39 SONYC RhoOph-6 BD* 16 27 05.92680 -24 18 40.2156           L0.1 15 0
40 [MPK2010b] 1344 BD? 16 27 05.96 -24 16 14.7           ~ 2 0
41 YLW 10A TT* 16 27 05.97576 -24 26 18.5172           ~ 23 1
42 [MPK2010b] 6412 BD? 16 27 06.51 -24 18 31.8           ~ 2 0
43 [GY92] 204 TT* 16 27 06.5924837856 -24 41 48.871282992       17.57 15.43 M5 99 0
44 [MPK2010b] 5783 BD? 16 27 06.82 -24 55 01.6           ~ 1 0
45 [MPK2010b] 1558 Y*? 16 27 07.02 -24 31 05.2           ~ 2 0
46 [MPK2010b] 3444 BD? 16 27 07.05 -24 50 41.4           ~ 1 0
47 [MPK2010b] 5111 BD? 16 27 07.08 -24 46 06.8           ~ 1 0
48 [MPK2010b] 7145 BD? 16 27 07.33 -24 31 40.2           ~ 1 0
49 BKLT J162707-242009 Y*? 16 27 08.04528 -24 20 07.3212           ~ 5 0
50 [MPK2010b] 3253 BD? 16 27 08.17 -24 41 19.4           ~ 2 0
51 [GY92] 208 Y*? 16 27 08.19456 -24 42 28.6776           ~ 6 0
52 [MPK2010b] 4933 BD? 16 27 08.40 -24 16 18.9           ~ 2 0
53 [MPK2010b] 4242 BD? 16 27 08.51 -24 47 16.5           ~ 1 0
54 BKLT J162708-241204 TT* 16 27 09.0794157000 -24 12 00.814867308       18.47 16.14 M2.5 31 0
55 WL 10 Or* 16 27 09.1062090672 -24 34 08.278196304           K9 72 0
56 [MPK2010b] 4669 BD? 16 27 09.17 -24 47 08.9           ~ 1 0
57 [GY92] 212 Y*O 16 27 09.3035723304 -24 43 20.060511204           ~ 10 0
58 [GY92] 213 Y*O 16 27 09.35328 -24 40 22.4292           ~ 32 0
59 [MPK2010b] 2438 BD? 16 27 09.37 -24 32 14.9           ~ 4 0
60 [MPK2010b] 4788 BD? 16 27 09.37 -24 24 04.3           ~ 2 0
61 [MPK2010b] 5988 BD? 16 27 09.51 -24 14 11.0           ~ 1 0
62 [MPK2010b] 5710 BD? 16 27 09.67 -24 24 18.2           ~ 2 0
63 2MASS J16271031-2419188 TT* 16 27 10.3129723824 -24 19 18.896516436           M4 12 1
64 WL 9 Y*O 16 27 10.34664 -24 33 22.6692           ~ 23 0
65 [MPK2010b] 3594 BD? 16 27 10.96 -24 46 37.1           ~ 1 0
66 [GY92] 221 Y*? 16 27 10.9651864176 -24 45 29.865642624           ~ 5 0
67 [MPK2010b] 4863 BD? 16 27 11.33 -24 23 26.5           ~ 2 0
68 [MPK2010b] 3878 BD? 16 27 11.68 -24 59 15.0           ~ 1 0
69 WLY 2-32 Y*O 16 27 11.68224 -24 23 41.9748           F 20 0
70 [MPK2010b] 4195 BD? 16 27 11.70 -24 23 21.0           ~ 2 0
71 BKLT J162711-244710 Y*? 16 27 11.7340130400 -24 47 10.950716652           ~ 3 0
72 [MPK2010b] 5820 BD? 16 27 11.99 -24 26 46.9           ~ 3 0
73 [MPK2010b] 2899 BD? 16 27 12.25 -24 57 41.4           ~ 1 0
74 [MPK2010b] 6480 BD? 16 27 12.36 -24 24 29.6           ~ 2 0
75 [MPK2010b] 14250 BD? 16 27 12.75 -24 31 59.9           ~ 2 0
76 CFHTWIR-Oph 64 BD? 16 27 13.04 -24 32 00.4           ~ 4 0
77 [MPK2010b] 3007 BD? 16 27 13.19 -24 55 50.4           ~ 1 0
78 [MPK2010b] 9002 BD? 16 27 13.54 -24 34 14.6           ~ 2 0
79 VSSG 24 Y*O 16 27 13.7329154424 -24 18 16.861890420           ~ 38 1
80 [GY92] 235 Y*O 16 27 13.8206486496 -24 43 31.647995436           M3.5 44 0
81 [MPK2010b] 5076 BD? 16 27 14.04 -24 32 05.9           ~ 2 0
82 [MPK2010b] 2956 BD? 16 27 14.11 -24 22 50.5           ~ 2 0
83 BKLT J162715-245137 TT* 16 27 15.1289055168 -24 51 38.814347988   16.9 15.02 13.86 12.38 M2 67 1
84 SSTYSV J162715.82-243407.1 BD? 16 27 15.83 -24 34 07.1           ~ 3 0
85 YLW 10C Y*O 16 27 15.88488 -24 25 14.1924           ~ 29 0
86 [MPK2010b] 7906 BD? 16 27 15.93 -24 22 53.1           ~ 2 0
87 BKLT J162716-244710 TT* 16 27 17.0735135784 -24 47 11.155084836   19.8   16.84 15.06 K1 27 0
88 [GY92] 243 Y*? 16 27 17.26728 -24 22 28.3368           ~ 7 0
89 SSTYSV J162717.41-243206.8 BD? 16 27 17.43 -24 32 06.9           ~ 3 0
90 SSTYSV J162717.87-244945.7 BD? 16 27 17.87 -24 49 45.4           ~ 2 0
91 SSTYSV J162718.13-242554.9 BD? 16 27 18.10 -24 25 55.2           ~ 4 0
92 [MPK2010b] 4487 BD? 16 27 18.15 -24 54 10.4           ~ 1 0
93 [GY92] 248 Y*? 16 27 18.37560 -24 24 26.3124           ~ 12 0
94 VSSG 26 Or* 16 27 18.48720 -24 29 05.9136           ~ 89 0
95 EM* SR 12 Or* 16 27 19.5054789229 -24 41 40.414828505     13.28 12.15 10.855 M0IVe 183 1
96 [MPK2010b] 5454 BD? 16 27 19.51 -24 26 21.5           ~ 2 0
97 [MPK2010b] 14819 BD? 16 27 19.79 -24 26 34.9           ~ 2 0
98 SSTYSV J162720.09-242625.6 BD? 16 27 20.05 -24 26 25.9           ~ 3 0
99 [MPK2010b] 2725 BD? 16 27 20.10 -24 43 50.7           ~ 1 0
100 [MPK2010b] 6333 BD? 16 27 20.60 -24 11 54.9           ~ 1 0
101 [MPK2010b] 2660 BD? 16 27 20.83 -24 56 25.2           ~ 1 0
102 SSTYSV J162721.04-242228.3 BD? 16 27 21.09 -24 22 28.6           ~ 3 0
103 [MPK2010b] 3961 BD? 16 27 21.61 -24 55 50.1           ~ 1 0
104 SSTYSV J162721.62-243219.2 BD? 16 27 21.63 -24 32 19.2           ~ 5 0
105 [GY92] 255 Y*O 16 27 21.68472 -24 21 49.9608           ~ 9 0
106 [GY92] 253 Y*O 16 27 21.83064 -24 43 35.6952           M3 29 0
107 BBRCG 43 Y*O 16 27 21.97560 -24 29 39.7716           ~ 27 0
108 [MPK2010b] 4276 BD? 16 27 22.79 -24 49 06.1           ~ 1 0
109 [MPK2010b] 5757 BD? 16 27 22.91 -24 18 26.9           ~ 2 0
110 VSSG 22 Or* 16 27 22.9174580712 -24 17 57.414656688           ~ 36 1
111 GBS-VLA J162722.96-242236.6 BD? 16 27 22.96 -24 22 36.5           ~ 4 0
112 [MPK2010b] 4264 BD? 16 27 23.47 -24 30 47.3           ~ 2 0
113 [MPK2010b] 6745 BD? 16 27 23.58 -24 34 45.6           ~ 2 0
114 BKLT J162723-241232 Y*? 16 27 23.5826205624 -24 12 28.827077652           ~ 3 0
115 BKLT J162723-241410 Y*? 16 27 24.05592 -24 14 08.0772           ~ 2 0
116 SSTYSV J162724.30-242044.6 BD? 16 27 24.31 -24 20 44.5           ~ 3 0
117 [MPK2010b] 3864 BD? 16 27 24.34 -24 44 25.6           ~ 1 0
118 [GY92] 258 TT* 16 27 24.39000 -24 41 47.5620           ~ 23 0
119 SSTYSV J162724.54-242849.7 BD? 16 27 24.59 -24 28 50.2           ~ 4 0
120 [MPK2010b] 2448 Y*? 16 27 24.61 -24 34 22.5           ~ 3 0
121 [GY92] 259 Y*O 16 27 24.63624 -24 29 35.3976           ~ 26 0
122 [MPK2010b] 4450 BD? 16 27 25.35 -24 25 37.5           ~ 6 0
123 [MPK2010b] 1900 BD? 16 27 25.46 -24 44 45.6           ~ 1 0
124 CFHTWIR-Oph 77 LM* 16 27 25.64400 -24 37 28.5168           M9.75 9 0
125 SSTYSV J162725.66-242954.0 BD? 16 27 25.67 -24 29 53.9           ~ 3 0
126 [MPK2010b] 7704 BD? 16 27 25.68 -24 35 06.4           ~ 2 0
127 [MPK2010b] 2776 BD? 16 27 25.70 -24 55 53.3           ~ 2 0
128 SSTYSV J162725.91-242857.2 BD? 16 27 25.89 -24 28 57.5           ~ 3 0
129 [MPK2010b] 6521 BD? 16 27 26.22 -24 57 50.0           ~ 1 0
130 BKLT J162726-241925 Y*O 16 27 26.22336 -24 19 22.9980           M7.75 30 0
131 CRBR 2424.5-3759 Y*? 16 27 26.39064 -24 44 39.4836           ~ 3 0
132 [GY92] 261 Y*? 16 27 26.53704 -24 45 15.2784           ~ 4 0
133 [GY92] 264 TT* 16 27 26.5812811008 -24 25 54.395321448       17.90 15.72 M8 47 0
134 BBRCG 46 Y*O 16 27 27.06864 -24 32 17.5200           ~ 17 0
135 Elia 2-31 TT* 16 27 27.3786513768 -24 31 16.442242464           ~ 71 1
136 [MPK2010b] 1750 BD? 16 27 27.41 -24 58 52.8           ~ 1 0
137 SSTYSV J162728.04-244534.6 BD? 16 27 28.06 -24 45 34.8           ~ 2 0
138 BBRCG 44 Y*? 16 27 28.14096 -24 31 43.0932           ~ 9 0
139 [WMR2005] 3-7 TT* 16 27 28.7290526040 -24 54 31.792610592       16.02 14.32 M4.75 16 0
140 BKLT J162728-241709 Y*? 16 27 28.75104 -24 17 07.0296           ~ 4 0
141 BBRCG 51 Y*? 16 27 29.29416 -24 34 08.5368           ~ 7 0
142 YLW 16B Or* 16 27 29.43528 -24 39 16.1892           ~ 106 0
143 [MPK2010b] 9096 BD? 16 27 29.53 -24 19 45.3           ~ 2 0
144 2MASS J16272959-2429247 BD? 16 27 29.598 -24 29 24.77           ~ 3 0
145 [MPK2010b] 2846 Y*? 16 27 29.84 -24 43 57.8           ~ 1 0
146 [MPK2010b] 7127 BD? 16 27 30.52 -24 11 28.5           ~ 1 0
147 BBRCG 54 TT* 16 27 30.5335023360 -24 32 34.879349616       15.64 14.30 M2 19 0
148 [MPK2010b] 6740 BD? 16 27 30.56 -24 38 26.5           ~ 2 0
149 BKLT J162730-244726 Y*O 16 27 30.8387523216 -24 47 26.789692992       18.32 16.17 M1-M2 23 0
150 SSTYSV J162730.99-242001.7 BD? 16 27 30.99 -24 20 01.7           ~ 3 0
151 BBRCG 56 Y*O 16 27 31.0593237432 -24 34 03.262655028           ~ 20 0
152 [MPK2010b] 5459 BD? 16 27 31.70 -24 59 29.2           ~ 1 0
153 BBRCG 58 Y*O 16 27 32.13768 -24 29 43.5696           M6 24 0
154 SSTYSV J162732.52-243946.7 BD? 16 27 32.53 -24 39 46.6           ~ 3 0
155 SSTYSV J162732.62-242245.6 BD? 16 27 32.64 -24 22 45.6           ~ 3 0
156 BBRCG 60 Y*O 16 27 32.67576 -24 33 23.9328           ~ 35 0
157 BBRCG 59 Y*O 16 27 32.71056 -24 32 42.3636           ~ 13 0
158 [GY92] 288 Y*O 16 27 32.72616 -24 45 00.4248           ~ 14 0
159 BKLT J162732-245344 Y*? 16 27 32.8614604128 -24 53 45.480094548           ~ 4 0
160 2MASS J16273288-2428116 BD? 16 27 32.883 -24 28 11.68           ~ 6 0
161 BKLT J162733-245314 Y*? 16 27 33.2475206664 -24 53 15.080542008           ~ 6 0
162 [MPK2010b] 9558 BD? 16 27 33.57 -24 22 48.6           ~ 2 0
163 SSTYSV J162733.65-243051.0 BD? 16 27 33.66 -24 30 51.2           ~ 3 0
164 AOC J162733.75-242234.9 Y*? 16 27 33.76608 -24 22 34.9824           ~ 6 0
165 [MPK2010b] 2840 BD? 16 27 33.78 -24 57 37.4           ~ 1 0
166 [GY92] 295 TT* 16 27 35.2627683216 -24 38 33.428056416       16.16 14.08 M4.5 40 0
167 2MASS J16273533-2439583 BD? 16 27 35.337 -24 39 58.32           ~ 4 0
168 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3625 1

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