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JOR15 - MALT-45: a 7 mm survey of the southern Galaxy - I. Techniques and spectral line data

Short title: Jordan et al. (2015)
Authors: Jordan, Christopher H. Walsh, Andrew J. Lowe, Vicki Voronkov, Maxim A. Ellingsen, Simon P. Breen, Shari L. Purcell, Cormac R. Barnes, Peter J. Burton, Michael G. Cunningham, Maria R. Hill, Tracey Jackson, James M. Longmore, Steven N. Peretto, Nicolas Urquhart, James S.
Journal: Monthly Notices of the Royal Astronomical Society, Volume 448, Issue 3, p.2344-2361
Bibcode: 2015MNRAS.448.2344J

PDF: JOR15.pdf

• Target type: Blind
  Transitions: SiO_1-0v1,SiO_1-0v2,SiO_1-0v3,SiO_1-0v0,CH3OH_25-30_GHz(I),CH3OH_36(I),CH3OH_44(I),CH3OH_84(I),CH3OH_95(I),CH3OH_6(II),CH3OH_37(II),CH3OH_38(II)
  

• Abstract

  We present the first results from the MALT-45 (Millimetre Astronomer's Legacy Team-45 GHz) Galactic Plane survey. We have observed 5 square degrees (l = 330°-335°, b = ±0.5°) for spectral lines in the 7 mm band (42-44 and 48-49 GHz), including CS (1-0), class I CH3OH masers in the 7(0,7)-6(1,6) A+ transition and SiO (1-0) v = 0, 1, 2, 3. MALT-45 is the first unbiased, large-scale, sensitive spectral line survey in this frequency range. In this paper, we present data from the survey as well as a few intriguing results rigorous analyses of these science cases are reserved for future publications. Across the survey region, we detected 77 class I CH3OH masers, of which 58 are new detections, along with many sites of thermal and maser SiO emission and thermal CS. We found that 35 class I CH3OH masers were associated with the published locations of class II CH3OH, H2O and OH masers but 42 have no known masers within 60 arcsec. We compared the MALT-45 CS with NH3 (1,1) to reveal regions of CS depletion and high opacity, as well as evolved star-forming regions with a high ratio of CS to NH3. All SiO masers are new detections, and appear to be associated with evolved stars from the Spitzer Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE). Generally, within SiO regions of multiple vibrational modes, the intensity decreases as v = 1, 2, 3, but there are a few exceptions where v = 2 is stronger than v = 1. eprintid: arXiv:1501.06650

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Descr.	Line	Vpeak	Fpeak	Telescope	RMS	Beam	Detection	Distance	Date
	(J2000)	(J2000)	(deg.)	(deg.)				CH3OH (class I)	(km/s)	(Jy)		(Jy)	(arcsec)	Yes/No	(kpc)
1	16 07 37.8	-52 30 52.1	330.2953	-0.3919	G330.294-0.392	G330.30-0.39		44 GHz (I)	-80.6	4.4	ATCA	4.900	64	+H2O +CH3OH I -CH3OH II	4.900	2012-2013
2	16 09 31.2	-52 16 3.9	330.6746	-0.4043	G330.676-0.402	G330.67-0.40		44 GHz (I)	-65.0	5.3	ATCA	5.600	64	+CH3OH I -CH3OH II	4.160	2012-2013
3	16 07 12.8	-51 43 3.4	330.7831	0.2415	G330.781+0.245	G330.78+0.24		44 GHz (I)	-43.4	3.7	ATCA	4.300	64	+CH3OH I	3.120	2012-2013
4	16 07 41.1	-51 43 48	330.8289	0.1832	G330.828+0.183	G330.83+0.18		44 GHz (I)	-82.0	3.1	ATCA	3.800	64	+CH3OH I	4.950	2012-2013
5	16 10 16.6	-52 05 54.3	330.8747	-0.3584	G330.877-0.368	G330.87-0.36		44 GHz (I)	-61.4	10	ATCA	15.000	64	+H2O +CH3OH I +CH3OH II +OH	4.000	2012-2013
6	16 10 22.3	-52 06 28.1	330.8790	-0.3752	G330.877-0.368	G330.88-0.38		44 GHz (I)	-65.5	7.8	ATCA	10.000	64	+H2O +CH3OH I +CH3OH II +OH	4.190	2012-2013
7	16 10 44.3	-52 06 04	330.9248	-0.4086	G330.926-0.408	G330.92-0.41		44 GHz (I)	-42.7	28	ATCA	33.000	64	+CH3OH I	3.090	2012-2013
8	16 10 6.9	-51 59 7.3	330.9331	-0.2585	G330.933-0.261	G330.93-0.26		44 GHz (I)	-89.9	5.0	ATCA	5.900	64	+CH3OH I -CH3OH II	5.330	2012-2013
9	16 09 53.1	-51 54 57.9	330.9541	-0.1836	G330.953-0.182	G330.95-0.18	Descr	44 GHz (I)	-87.6	4.0	ATCA	4.700	64	+H2O +CH3OH I +CH3OH II +OH	5.210	2012-2013
10	16 12 0.3	-52 00 38.5	331.1290	-0.4751	G331.129-0.475	G331.13-0.48		44 GHz (I)	-68.0	5.6	ATCA	7.500	64	+CH3OH I	4.300	2012-2013
11	16 12 5.9	-52 01 33.3	331.1290	-0.4961	G331.129-0.475	G331.13-0.50		44 GHz (I)	-68.2	8.6	ATCA	11.000	64	+CH3OH I	4.310	2012-2013
12	16 11 0.7	-51 50 24.8	331.1332	-0.2460	G331.132-0.244	G331.13-0.25		44 GHz (I)	-91.4	71	ATCA	88.000	64	+H2O +CH3OH I +CH3OH II +OH	5.390	2012-2013
13	16 09 15.5	-51 33 8.1	331.1290	0.1499	G331.134+0.156	G331.13+0.15		44 GHz (I)	-75.7	68	ATCA	60.000	64	+H2O +CH3OH I +CH3OH II	4.650	2012-2013
14	16 09 52.2	-51 32 18.6	331.2083	0.0956	G331.205+0.095	G331.21+0.10		44 GHz (I)	-67.4	3.5	ATCA	3.300	64	+CH3OH I	4.270	2012-2013
15	16 11 31.3	-51 41 54.8	331.2875	-0.1961	G331.278-0.188	G331.29-0.20		44 GHz (I)	-89.5	15	ATCA	20.000	64	+H2O +CH3OH I +CH3OH II +OH	5.290	2012-2013
16	16 12 27.4	-51 46 26.9	331.3416	-0.3502	G331.342-0.346	G331.34-0.35		44 GHz (I)	-65.9	32	ATCA	37.000	64	+CH3OH I +CH3OH II +OH	4.210	2012-2013
17	16 11 6.4	-51 31 9.7	331.3624	-0.0210	G331.362-0.017	G331.36-0.02		44 GHz (I)	-84.4	4.7	ATCA	5.800	64	+CH3OH I -CH3OH II	5.050	2012-2013
18	16 12 48.9	-51 47 26.2	331.3707	-0.4001	G331.369-0.399	G331.37-0.40		44 GHz (I)	-65.3	5.9	ATCA	7.300	64	+CH3OH I	4.180	2012-2013
19	16 11 39.5	-51 35 35.3	331.3749	-0.1335	G331.375-0.133	G331.37-0.13		44 GHz (I)	-89.3	3.7	ATCA	4.500	64	+CH3OH I	5.280	2012-2013
20	16 10 28.7	-51 22 37.6	331.3874	0.1498	G331.384+0.149	G331.39+0.15		44 GHz (I)	-45.9	6.5	ATCA	5.800	64	+CH3OH I	3.260	2012-2013
21	16 11 57.8	-51 35 40.6	331.4085	-0.1669	G331.409-0.166	G331.41-0.17		44 GHz (I)	-85.2	4.9	ATCA	6.600	64	+CH3OH I	5.080	2012-2013
22	16 12 11.4	-51 35 24.1	331.4373	-0.1876	G331.442-0.187	G331.44-0.19		44 GHz (I)	-88.2	14	ATCA	18.000	64	+H2O +CH3OH I +CH3OH II +OH	9.530	2012-2013
23	16 12 0.6	-51 27 44.3	331.5042	-0.0752	G331.512-0.101	G331.50-0.08		44 GHz (I)	-89.3	38	ATCA	49.000	64	+H2O +CH3OH I +OH	5.270	2012-2013
24	16 12 8.2	-51 29 01	331.5040	-0.1042	G331.512-0.101	G331.50-0.10		44 GHz (I)	-87.1	11	ATCA	14.000	64	+H2O +CH3OH I +OH	5.170	2012-2013
25	16 12 6.3	-51 27 35.5	331.5167	-0.0835	G331.512-0.101	G331.52-0.08		44 GHz (I)	-90.4	20	ATCA	18.000	64	+H2O +CH3OH I +OH	5.330	2012-2013
26	16 12 15.4	-51 27 17.1	331.5374	-0.0960	G331.535-0.098	G331.54-0.10		44 GHz (I)	-92.3	77	ATCA	77.000	64	+CH3OH I	5.420	2012-2013
27	16 12 10.1	-51 25 39.9	331.5458	-0.0668	G331.543-0.066	G331.55-0.07		44 GHz (I)	-89.1	4.9	ATCA	5.300	64	+CH3OH I +CH3OH II +OH	5.260	2012-2013
28	16 12 26.8	-51 27 20.4	331.5584	-0.1169	G331.556-0.121	G331.56-0.12		44 GHz (I)	-101.0	14	ATCA	16.000	64	+H2O +CH3OH I +CH3OH II +OH	5.870	2012-2013
29	16 13 33.1	-51 24 28	331.7166	-0.2001	G331.720-0.202	G331.72-0.20		44 GHz (I)	-47.0	4.1	ATCA	3.800	64	+CH3OH I -CH3OH II	3.320	2012-2013
30	16 13 54	-51 15 32.1	331.8584	-0.1294	G331.856-0.130	G331.86-0.13		44 GHz (I)	-50.2	5.6	ATCA	6.500	64	+CH3OH I	3.480	2012-2013
31	16 13 11.6	-51 06 19.8	331.8833	0.0582	G331.884+0.060	G331.88+0.06		44 GHz (I)	-89.3	10	ATCA	13.000	64	+CH3OH I	5.260	2012-2013
32	16 13 58.2	-51 10 46.7	331.9209	-0.0794	G331.921-0.081	G331.92-0.08		44 GHz (I)	-52.1	5.8	ATCA	6.400	64	+CH3OH I	3.570	2012-2013
33	16 16 13.7	-51 18 30.7	332.0874	-0.4168	G332.094-0.421	G332.09-0.42	Descr	44 GHz (I)	-56.1	17	ATCA	21.000	64	+H2O +CH3OH I +CH3OH II	3.760	2012-2013
34	16 15 18.1	-50 56 3.2	332.2417	-0.0460	G332.241-0.044	G332.24-0.05		44 GHz (I)	-49.3	140	ATCA	180.000	64	+CH3OH I	3.440	2012-2013
35	16 15 43.9	-50 55 57.8	332.2916	-0.0918	G332.295-0.094	G332.30-0.09		44 GHz (I)	-49.9	41	ATCA	37.000	64	+H2O +CH3OH I +CH3OH II	3.470	2012-2013
36	16 14 42	-50 42 50.2	332.3251	0.1789	G332.325+0.179	G332.32+0.18		44 GHz (I)	-48.5	9.3	ATCA	11.000	64	+H2O +CH3OH I	3.400	2012-2013
37	16 16 8.8	-50 53 55.2	332.3624	-0.1126	G332.352-0.116	G332.36-0.11		44 GHz (I)	-50.6	9.8	ATCA	12.000	64	+CH3OH I +CH3OH II +OH	3.510	2012-2013
38	16 16 1.3	-50 33 12.6	332.5874	0.1499	G332.583+0.147	G332.59+0.15		44 GHz (I)	-42.7	3.4	ATCA	4.000	64	+CH3OH I +CH3OH II	11.790	2012-2013
39	16 17 28.1	-50 46 21.2	332.6001	-0.1669	G332.604-0.167	G332.60-0.17		44 GHz (I)	-46.1	15	ATCA	18.000	64	+CH3OH I +CH3OH II	3.290	2012-2013
40	16 17 27.9	-50 36 16.5	332.7167	-0.0460	G332.717-0.047	G332.72-0.05		44 GHz (I)	-40.4	6.4	ATCA	7.300	64	+CH3OH I	3.010	2012-2013
41	16 20 27.1	-50 40 58.3	333.0000	-0.4335	G333.000-0.433	G333.00-0.43		44 GHz (I)	-56.7	6.6	ATCA	9.800	64	+H2O +CH3OH I	3.800	2012-2013
42	16 18 55.5	-50 24 4.3	333.0249	-0.0626	G333.029-0.063	G333.02-0.06		44 GHz (I)	-41.2	6.8	ATCA	7.900	64	+CH3OH I +CH3OH II	3.060	2012-2013
43	16 18 44.6	-50 21 56	333.0292	-0.0169	G333.029-0.015	G333.03-0.02		44 GHz (I)	-42.5	5.6	ATCA	7.000	64	+CH3OH I +CH3OH II	3.120	2012-2013
44	16 20 48.4	-50 38 41.3	333.0667	-0.4460	G333.068-0.447	G333.07-0.44		44 GHz (I)	-54.8	2.7	ATCA	3.200	64	+CH3OH I +CH3OH II	3.720	2012-2013
45	16 20 37.3	-50 36 33.5	333.0709	-0.4002	G333.072-0.400	G333.07-0.40		44 GHz (I)	-52.9	4.1	ATCA	4.600	64	+CH3OH I	3.630	2012-2013
46	16 21 15.1	-50 39 45.6	333.1041	-0.5084	G333.109-0.500	G333.10-0.51		44 GHz (I)	-57.6	14	ATCA	8.100	64	+CH3OH I +CH3OH II	3.850	2012-2013
47	16 21 04	-50 35 52	333.1291	-0.4418	G333.126-0.434	G333.13-0.44		44 GHz (I)	-50.2	120	ATCA	150.000	64	+H2O +CH3OH I +CH3OH II +OH	3.500	2012-2013
48	16 21 1.8	-50 34 27.1	333.1416	-0.4209	G333.126-0.434	G333.14-0.42		44 GHz (I)	-56.3	16	ATCA	18.000	64	+H2O +CH3OH I +CH3OH II +OH	3.790	2012-2013
49	16 19 43.4	-50 19 43	333.1666	-0.1001	G333.163-0.101	G333.16-0.10		44 GHz (I)	-91.8	5.6	ATCA	7.700	64	+CH3OH I +CH3OH II	5.330	2012-2013
50	16 19 45.7	-50 18 18.3	333.1875	-0.0876	G333.184-0.091	G333.18-0.09		44 GHz (I)	-87.1	5.6	ATCA	7.100	64	+CH3OH I +CH3OH II	5.130	2012-2013
51	16 21 18.6	-50 30 23.5	333.2209	-0.4044	G333.220-0.403	G333.22-0.40		44 GHz (I)	-51.9	17	ATCA	19.000	64	+CH3OH I	3.590	2012-2013
52	16 19 50.3	-50 15 28.9	333.2292	-0.0627	G333.234-0.061	G333.23-0.06		44 GHz (I)	-87.6	250	ATCA	310.000	64	+H2O +CH3OH I +CH3OH II +OH	5.150	2012-2013
53	16 19 29.5	-50 11 23.5	333.2376	0.0248	G333.234+0.027	G333.24+0.02		44 GHz (I)	-69.3	3.9	ATCA	5.400	64	+CH3OH I	4.370	2012-2013
54	16 21 29.7	-50 26 30.3	333.2875	-0.3793	G333.286-0.376	G333.29-0.38		44 GHz (I)	-52.3	5.4	ATCA	6.300	64	+CH3OH I	3.610	2012-2013
55	16 21 25.3	-50 25 5.4	333.2959	-0.3543	G333.303-0.359	G333.30-0.35		44 GHz (I)	-50.8	3.5	ATCA	3.600	64	+CH3OH I -CH3OH II	3.540	2012-2013
56	16 19 28.7	-50 04 50.9	333.3126	0.1040	G333.315+0.105	G333.31+0.10		44 GHz (I)	-45.3	7.7	ATCA	13.000	64	+H2O +CH3OH I +CH3OH II +OH	11.740	2012-2013
57	16 21 36.4	-50 23 40.6	333.3334	-0.3585	G333.335-0.360	G333.33-0.36		44 GHz (I)	-52.1	22	ATCA	22.000	64	+CH3OH I	3.600	2012-2013
58	16 21 4.4	-50 15 21.6	333.3709	-0.2002	G333.371-0.202	G333.37-0.20		44 GHz (I)	-61.6	13	ATCA	16.000	64	+H2O +CH3OH I	4.030	2012-2013
59	16 20 10.6	-50 04 53.7	333.3918	0.0248	G333.387+0.032	G333.39+0.02		44 GHz (I)	-70.6	4.1	ATCA	6.500	64	+CH3OH I +CH3OH II +OH	10.600	2012-2013
60	16 21 22.1	-50 09 42.5	333.4708	-0.1667	G333.466-0.164	G333.47-0.16		44 GHz (I)	-43.4	21	ATCA	23.000	64	+H2O +CH3OH I +CH3OH II +OH	3.180	2012-2013
61	16 20 7.6	-49 55 10.1	333.5000	0.1457	G333.499+0.144	G333.50+0.15		44 GHz (I)	-112.9	3.5	ATCA	5.900	64	+CH3OH I	6.350	2012-2013
62	16 22 1.9	-50 12 11.2	333.5167	-0.2710	G333.520-0.273	G333.52-0.27		44 GHz (I)	-50.6	6.4	ATCA	8.700	64	+CH3OH I	3.530	2012-2013
63	16 22 19.6	-50 11 28.6	333.5585	-0.2961	G333.555-0.294	G333.56-0.30		44 GHz (I)	-46.5	7.8	ATCA	11.000	64	+CH3OH I	3.330	2012-2013
64	16 21 09	-49 59 48.3	333.5625	-0.0251	G333.562-0.025	G333.56-0.02		44 GHz (I)	-40.2	54	ATCA	63.000	64	+CH3OH I +CH3OH II	12.020	2012-2013
65	16 20 55.9	-49 57 19.4	333.5667	0.0290	G333.568+0.029	G333.57+0.03		44 GHz (I)	-85.0	6.2	ATCA	6.400	64	+CH3OH I	5.040	2012-2013
66	16 22 8.5	-50 06 31.7	333.5959	-0.2168	G333.604-0.214	G333.59-0.21	Descr	44 GHz (I)	-49.7	26	ATCA	34.000	64	+H2O +CH3OH I +OH	3.490	2012-2013
67	16 22 29.4	-50 01 23.8	333.6960	-0.1960	G333.694-0.196	G333.70-0.20		44 GHz (I)	-51.0	4.4	ATCA	6.100	64	+CH3OH I	3.550	2012-2013
68	16 22 12.8	-49 57 20.1	333.7125	-0.1168	G333.712-0.116	G333.71-0.12		44 GHz (I)	-31.9	6.6	ATCA	6.900	64	+CH3OH I	2.580	2012-2013
69	16 22 0.7	-49 50 26.5	333.7709	-0.0126	G333.772-0.011	G333.77-0.01		44 GHz (I)	-89.5	16	ATCA	20.000	64	+CH3OH I	5.220	2012-2013
70	16 23 3.5	-50 00 51	333.7668	-0.2544	G333.770-0.256	G333.77-0.25		44 GHz (I)	-49.5	6.4	ATCA	8.000	64	+CH3OH I	3.490	2012-2013
71	16 23 28.8	-50 00 39.2	333.8168	-0.3002	G333.818-0.302	G333.82-0.30		44 GHz (I)	-48.5	19	ATCA	24.000	64	+CH3OH I	3.440	2012-2013
72	16 22 57.7	-49 48 39.2	333.9001	-0.1001	G333.900-0.099	G333.90-0.10		44 GHz (I)	-64.4	3.4	ATCA	4.100	64	+CH3OH I +CH3OH II +OH	10.920	2012-2013
73	16 23 17.4	-49 48 38.4	333.9376	-0.1376	G333.931-0.135	G333.94-0.14		44 GHz (I)	-42.3	4.6	ATCA	4.900	64	+CH3OH I +CH3OH II	3.140	2012-2013
74	16 22 34.6	-49 37 52.8	333.9836	0.0706	G333.979+0.072	G333.98+0.07		44 GHz (I)	-58.4	4.5	ATCA	5.700	64	+CH3OH I	3.900	2012-2013
75	16 23 15	-49 40 51.7	334.0251	-0.0417	G334.026-0.044	G334.03-0.04		44 GHz (I)	-84.4	11	ATCA	14.000	64	+CH3OH I	5.010	2012-2013
76	16 23 50.4	-48 54 8.7	334.6464	0.4373	G334.646+0.437	G334.64+0.44		44 GHz (I)	-66.5	5.7	ATCA	6.400	64	+CH3OH I	4.270	2012-2013
77	16 23 56.6	-48 47 3.7	334.7424	0.5082	G334.744+0.507	G334.74+0.51		44 GHz (I)	-61.4	18	ATCA	6.700	64	+CH3OH I	4.050	2012-2013

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DSS colored 2MASS colored WISE colored SDSS color IRAC color I1,I2,I4 GLIMPSE 360 PACS color (70-160 um) SPIRE color (250-500 um) NVSS (1.4GHz) ATLASGAL 870 um ATLASGAL 870 um + Planck Bolocam 1.1 mm UKIDSS K 2MASS K