2017ApJ...838..114K

Query : 2017ApJ...838..114K

2017ApJ...838..114K - Astrophys. J., 838, 114-114 (2017/April-1)

ALMA observations of starless core substructure in Ophiuchus.

KIRK H., DUNHAM M.M., DI FRANCESCO J., JOHNSTONE D., OFFNER S.S.R., SADAVOY S.I., TOBIN J.J., ARCE H.G., BOURKE T.L., MAIRS S., MYERS P.C., PINEDA J.E., SCHNEE S. and SHIRLEY Y.L.

Abstract (from CDS):

Compact substructure is expected to arise in a starless core as mass becomes concentrated in the central region likely to form a protostar. Additionally, multiple peaks may form if fragmentation occurs. We present Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 2 observations of 60 starless and protostellar cores in the Ophiuchus molecular cloud. We detect eight compact substructures which are 15^′′ from the nearest Spitzer young stellar object. Only one of these has strong evidence for being truly starless after considering ancillary data, e.g., from Herschel and X-ray telescopes. An additional extended emission structure has tentative evidence for starlessness. The number of our detections is consistent with estimates from a combination of synthetic observations of numerical simulations and analytical arguments. This result suggests that a similar ALMA study in the Chamaeleon I cloud, which detected no compact substructure in starless cores, may be due to the peculiar evolutionary state of cores in that cloud.

Journal keyword(s): Stars: formation - submillimeter: ISM - submillimeter: ISM

Simbad objects: 97

Full paper

View the references in ADS

Number of rows : 97

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2023	#notes
1	NAME Perseus Cloud	SFR	03 35.0	+31 13					~	1291	0
2	NAME Taurus Complex	SFR	04 41.0	+25 52					~	4175	0
3	M 42	OpC	05 35 17	-05 23.4					~	3999	0
4	NAME Cha 1	MoC	11 06 48	-77 18.0					~	1109	1
5	NAME Chamaeleon Region	SFR	11 55	-78.0					~	770	0
6	[JJK2008] SMM J162608-24202	smm	16 26 08.0	-24 20 20					~	5	0
7	JCMTSF J162609.6-241944	cor	16 26 10.0	-24 19 41					~	8	0
8	HGBS J162610.1-242313	cor	16 26 10.3	-24 23 06					~	13	0
9	GSS 26	Y*O	16 26 10.33152	-24 20 54.8232					M0	82	1
10	[JJK2008] SMM J162614-24234	cor	16 26 13.9	-24 23 43					~	2	0
11	[JJK2008] SMM J162614-24232	cor	16 26 13.9	-24 23 25					~	2	0
12	HGBS J162614.5-242510	cor	16 26 14.56	-24 25 10.8					~	4	0
13	[JJK2008] SMM J162615-24231	cor	16 26 14.6	-24 23 07					~	2	0
14	[JJK2008] SMM J162616-24235	cor	16 26 15.7	-24 23 55					~	2	0
15	CRBR 2315.8-1700	Y*O	16 26 17.22936	-24 23 45.3660					~	43	0
16	CRBR 2317.5-1729	Y*O	16 26 18.98232	-24 24 14.2596					M6	47	0
17	GSS 30	Y*O	16 26 21.38160	-24 23 04.0524					~	207	1
18	[JJK2008] SMM J162622-24225	smm	16 26 21.60	-24 22 54.8					~	40	0
19	[CHG85] GSS 30 IRS 3	Y*O	16 26 21.77376	-24 22 51.3948					~	60	0
20	Elia 2-24	TT*	16 26 24.0886188024	-24 16 13.448569260	16.3	14.40	15.81	13.97	K6	154	1
21	[GY92] 30	Y*O	16 26 25.48920	-24 23 01.5576					~	45	0
22	ALMA J162625.63-242429.5	Y*O	16 26 25.62	-24 24 28.9					~	37	1
23	NAME VLA 1623-243	Y*O	16 26 26.42	-24 24 30.0					~	401	0
24	[SSG2006] MMS002	smm	16 26 26.50	-24 24 30.9					~	241	0
25	NAME rho Oph A SM 1N	cor	16 26 27.12	-24 23 34.8					~	46	0
26	ALMA J162627.43-242418.2	?	16 26 27.430	-24 24 18.26					~	1	0
27	NAME rho Oph A SM 1	cor	16 26 27.60	-24 23 55.0					~	60	0
28	[JJK2008] SMM J162628-24235	PoC	16 26 27.6	-24 23 55					~	8	0
29	[MAN98] A-MM6	smm	16 26 27.60	-24 23 02.4					~	15	0
30	ALMA J162627.86-242359.5	?	16 26 27.860	-24 23 59.56					~	1	0
31	VSSG 27	Y*O	16 26 30.46896	-24 22 57.1440					M	62	1
32	HGBS J162632.9-242614	cor	16 26 32.8	-24 26 21					~	6	0
33	[GY92] 91	Y*O	16 26 40.46952	-24 27 14.4720					~	75	1
34	NAME SMM J16267-2417	cor	16 26 43.5	-24 17 26					~	9	0
35	VSSG 30	Y*O	16 26 44.19504	-24 34 48.3492					~	134	0
36	[JJK2008] SMM J162644-24253	cor	16 26 44.5	-24 25 28					~	2	0
37	GSS 39	Y*O	16 26 45.0318401664	-24 23 07.793180124					M0	188	1
38	[JJK2008] SMM J162646-24242	cor	16 26 46.0	-24 24 19					~	2	0
39	HGBS J162648.3-242351	cor	16 26 48.30	-24 23 51.0					~	5	0
40	EM* SR 24A	TT*	16 26 58.5134422944	-24 45 36.722580480			14.15	12.87	K1	101	0
41	Haro 1-7	**	16 26 58.53	-24 45 35.3					K2:e+M0.5e	100	0
42	WL 22	TT*	16 26 59.16720	-24 34 58.8072					~	64	0
43	HGBS J162658.9-243422	cor	16 26 59.60	-24 34 25.3					~	21	0
44	[YEE2006] 13	cor	16 27 04.80	-24 39 14.4					~	18	0
45	[GY92] 197	Y*O	16 27 05.24616	-24 36 29.7936					~	67	1
46	ALMA J162705.86-243708.3	?	16 27 05.860	-24 37 08.36					~	1	0
47	WL 17	Y*O	16 27 06.77616	-24 38 14.9964					~	97	0
48	Elia 2-29	Y*O	16 27 09.43032	-24 37 18.7716					~	280	1
49	ALMA J162709.49-243722.8	?	16 27 09.490	-24 37 22.89					~	1	0
50	HGBS J162710.7-243925	cor	16 27 11.2	-24 39 26					~	13	0
51	[JJK2008] SMM J162712-24290	smm	16 27 11.70	-24 29 04.4					~	2	0
52	HGBS J162712.2-243803	cor	16 27 11.8	-24 38 03					~	6	0
53	IRAS 16242-2422	cor	16 27 12.6	-24 29 46					~	18	0
54	JCMTSF J162714.6-243020	smm	16 27 14.6	-24 30 20					~	4	0
55	[JJK2008] SMM J162725-24273	smm	16 27 25.10	-24 27 28.4					~	3	0
56	YLW 16C	Or*	16 27 26.48952	-24 39 23.0760					M1	56	0
57	YLW 15B	Y*O	16 27 26.61768	-24 40 45.1524					~	29	0
58	[JWM2000] SMM J16274-2440	PoC	16 27 26.70	-24 40 52.3					~	21	0
59	YLW 15	Y*O	16 27 26.93640	-24 40 50.8224					~	257	1
60	YLW 16A	Y*O	16 27 28.02744	-24 39 33.5052					K8	190	0
61	HGBS J162728.1-242712	cor	16 27 28.1	-24 27 11					~	23	0
62	YLW 16B	Or*	16 27 29.43528	-24 39 16.1892					~	105	0
63	JCMTLSG J162729.5-242739	Y*O	16 27 29.6	-24 27 37					~	14	0
64	[JJK2008] SMM J162730-24264	smm	16 27 29.9	-24 26 33					~	5	0
65	Elia 2-33	Y*O	16 27 30.18024	-24 27 43.3656					M2	115	1
66	[JJK2008] SMM J162730-24415	smm	16 27 30.5	-24 41 56					~	5	0
67	[JJK2008] SMM J162733-24262	smm	16 27 33.00	-24 26 22.3					~	3	0
68	[GY92] 301	Y*O	16 27 37.24944	-24 42 38.0160					~	37	0
69	[JJK2008] SMM J162739-24424	cor	16 27 38.8	-24 42 37					~	2	0
70	YLW 45	Y*O	16 27 39.82824	-24 43 15.0672					~	115	0
71	JCMTSF J162758.6-243343	cor	16 27 58.3	-24 33 42					~	24	0
72	NAME Ophiuchus Molecular Cloud	SFR	16 28 06	-24 32.5					~	3497	1
73	[SSG2006] MMS126	Y*O	16 28 21.61	-24 36 23.4					~	35	0
74	IRAS 16253-2429	FIR	16 28 22.2	-24 36 31					~	35	0
75	HGBS J163132.1-240314	cor	16 31 32.5	-24 03 18					~	10	0
76	IRAS 16285-2355	Y*O	16 31 35.65752	-24 01 29.4708					~	124	0
77	HGBS J163138.2-244949	cor	16 31 38.28	-24 49 49.2					~	5	0
78	[JJK2008] SMM J163139-24506	cor	16 31 38.9	-24 51 00					~	2	0
79	[JJK2008] SMM J163140-24485	cor	16 31 40.5	-24 48 54					~	2	0
80	[JJK2008] SMM J163141-24495	cor	16 31 41.3	-24 49 48					~	2	0
81	HGBS J163143.6-240022	cor	16 31 43.5	-24 00 27					~	8	0
82	ISO-Oph 204	TT*	16 31 52.1203898904	-24 56 15.707944320					~	43	0
83	[JJK2008] SMM J163154-24560	smm	16 31 53.80	-24 56 00.2					~	2	0
84	HGBS J163157.1-245714	cor	16 31 57.14	-24 57 14.8					~	5	0
85	WLY 2-67	Y*O	16 32 00.99624	-24 56 41.9640					~	59	0
86	IRAS 16293-2422	cor	16 32 22.56	-24 28 31.8					~	1205	1
87	NAME IRAS 16293-2422B	Y*O	16 32 22.63	-24 28 31.8					~	255	0
88	NAME IRAS 16293-2422A	Y*O	16 32 22.869	-24 28 36.11					~	156	0
89	LDN 1689N	DNe	16 32 25.96	-24 28 46.2					~	114	0
90	NAME IRAS 16293E	cor	16 32 29.060	-24 29 10.27					~	56	1
91	HGBS J163229.7-235551	cor	16 32 29.5	-23 55 54					~	9	0
92	[JJK2008] SMM J163247-23524	smm	16 32 47.3	-23 52 37					~	5	0
93	[JJK2008] SMM J163248-23524	smm	16 32 48.00	-23 52 40.5					~	2	0
94	[JJK2008] SMM J163248-23523	smm	16 32 48.30	-23 52 25.5					~	2	0
95	[JJK2008] SMM J163249-23521	smm	16 32 49.30	-23 52 13.5					~	2	0
96	2MASS J16335560-2442049	Y*O	16 33 55.6148566800	-24 42 05.002391016					K7	49	0
97	HGBS J163448.3-243804	cor	16 34 48.4	-24 38 04					~	6	0

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