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RIC19 - A 6.7 GHz methanol maser survey of the central molecular zone

Interferometry data

Short title: Rickert et al. (2019)
Authors: Rickert, MatthewYusef-Zadeh, F.Ott, J.
Journal: Monthly Notices of the Royal Astronomical Society, Volume 482, Issue 4, p.5349-5361
Bibcode:

Target type: Galaxy_center
Transitions: CH3OH_6(II)

Abstract
The central molecular zone (CMZ) spans the inner 450 pc (3 deg) of our Galaxy. This region is defined by its enhanced molecular emission and contains 5 per cent of the entire Galaxys molecular gas mass. However, the number of detected star-forming sites towards the CMZ may be low for the amount of molecular gas that is present, and improved surveys of star formation indicators can help clarify this. With the Karl G. Jansky Very Large Array (VLA), we conducted a blind survey of 6.7 GHz methanol (CH₃OH) masers spanning the inner 3 deg - 40 arcmin (450 pc - 100 pc) of the Galaxy. We detected 43 CH₃OH masers towards 28 locations, 188 of which are new detections. The velocities of most of these masers are consistent with being located within the CMZ. A majority of the detected CH₃OH masers are distributed towards positive Galactic longitudes, similar to two-thirds of the molecular gas mass distributed at positive Galactic longitudes. The 6.7 GHz CH₃OH maser is an exclusive indicator of high-mass (>8 M_sol) star formation, with new detections indicating sites of massive star formation in the CMZ.

Abstract

The central molecular zone (CMZ) spans the inner 450 pc (3 deg) of our Galaxy. This region is defined by its enhanced molecular emission and contains 5 per cent of the entire Galaxys molecular gas mass. However, the number of detected star-forming sites towards the CMZ may be low for the amount of molecular gas that is present, and improved surveys of star formation indicators can help clarify this. With the Karl G. Jansky Very Large Array (VLA), we conducted a blind survey of 6.7 GHz methanol (CH₃OH) masers spanning the inner 3 deg - 40 arcmin (450 pc - 100 pc) of the Galaxy. We detected 43 CH₃OH masers towards 28 locations, 188 of which are new detections. The velocities of most of these masers are consistent with being located within the CMZ. A majority of the detected CH₃OH masers are distributed towards positive Galactic longitudes, similar to two-thirds of the molecular gas mass distributed at positive Galactic longitudes. The 6.7 GHz CH₃OH maser is an exclusive indicator of high-mass (>8 M_sol) star formation, with new detections indicating sites of massive star formation in the CMZ.

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Detection table from Rickert et al. (2019)

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ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	Group id	#	Source name	Image	Line	V_peak	F_peak	∫F dv	Telescope	RMS	Beam	PA	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)					CH₃OH (class II)	(km/s)	(Jy/beam)	(Jy/beam*km/s)		(Jy/beam)	(arcsec)	(deg.)	Yes/No		(kpc)
1	+17 48 10.301	-27 43 20.877			1.328911	0.149555	G1.3290+0.1496		1.329+0.150	Image	6.6 GHz (II);				NRAOVLA	0.040	0.86 x 0.29	13	-H₂O +CH₃OH II	SFR		2015 July 09
	+17 48 10.301	-27 43 20.877	-0.6 mas	0.6 mas	1.328911	0.149555		1	1.329+0.150			-12.0 (0.1)	0.72 (0.14)	0.34 (0.10)
2	+17 48 58.08	-27 52 58.6			1.282257	-0.084083	G1.2821-0.0840		1.282-0.084	Image	6.6 GHz (II);				NRAOVLA	0.010	0.86 x 0.29	13	+CH₃OH II	SFR		2015 July 09
	+17 48 58.08	-27 52 58.6	0 mas	-1.6 mas	1.282257	-0.084083		1	1.282-0.084			-9.7 (0.1)	0.36 (0.02)	0.22 (0.02)
3	+17 48 48.549	-28 01 11.102			1.146933	-0.124505	G1.1468-0.1245		1.147-0.125	Image	6.6 GHz (II);				NRAOVLA	0.030	0.86 x 0.29	13	+H₂O +CH₃OH II	SFR_MIXED		2015 July 09
	+17 48 48.549	-28 01 11.102	-1.8 mas	1.6 mas	1.146933	-0.124505		1	1.147-0.125			-19.7 (0.3)	0.24 (0.06)	0.50 (0.19)
	+17 48 48.549	-28 01 11.102	-1.8 mas	1.6 mas	1.146933	-0.124505		2	1.147-0.125			-15.1 (0.1)	15.0 (1.3)	6.03 (0.67)
4	+17 48 55.287	-28 11 48.192			1.008025	-0.236916	G1.008-0.237		1.008-0.237		6.6 GHz (II);				NRAOVLA	0.060	0.86 x 0.29	13	+H₂O +CH₃OH II +OH	SFR		2015 July 09
	+17 48 55.287	-28 11 48.192	-1.8 mas	0 mas	1.008025	-0.236916		1	1.008-0.237			1.7 (0.1)	8.05 (0.19)	4.05 (0.15)
	+17 48 55.287	-28 11 48.192	-1.8 mas	0 mas	1.008025	-0.236916		2	1.008-0.237			5.9 (0.1)	1.10 (0.06)	0.84 (0.07)
5	+17 48 0.435	-28 11 16.945			0.911524	-0.059886	G0.9115-0.0599		0.912-0.060	Image	6.6 GHz (II);				NRAOVLA	0.020	0.86 x 0.29	13	+CH₃OH II	SFR		2015 July 09
	+17 48 0.435	-28 11 16.945	-1.8 mas	-1 mas	0.911524	-0.059886		1	0.912-0.060			-71.3 (0.1)	0.11 (0.02)	0.07 (0.02)
6	+17 47 58.728	-28 11 4.789			0.911175	-0.052774	G0.9112-0.0528		0.911-0.053		6.6 GHz (II);				NRAOVLA	0.020	0.86 x 0.29	13	+CH₃OH II	SFR		2015 July 09
	+17 47 58.728	-28 11 4.789	0 mas	1.4 mas	0.911175	-0.052774		1	0.911-0.053			26.5 (0.1)	0.12 (0.02)	0.05 (0.02)
7	+17 48 0.205	-28 11 27.186			0.908652	-0.060633	G0.9087-0.0606		0.909-0.061	Image	6.6 GHz (II);				NRAOVLA	0.020	0.86 x 0.29	13	+CH₃OH II	SFR		2015 July 09
	+17 48 0.205	-28 11 27.186	0.6 mas	0 mas	0.908652	-0.060633		1	0.909-0.061			19.0 (0.1)	0.11 (0.02)	0.05 (0.02)
8	+17 47 51.201	-28 10 54.39			0.899357	-0.027617	G0.8994-0.0276		0.899-0.028	Image	6.6 GHz (II);				NRAOVLA	0.020	0.86 x 0.29	13	+CH₃OH II	SFR		2015 July 09
	+17 47 51.201	-28 10 54.39	-1.8 mas	0 mas	0.899357	-0.027617		1	0.899-0.028			42.9 (0.1)	0.12 (0.04)	0.05 (0.02)
9	+17 48 1.828	-28 13 2.861			0.888979	-0.079469	G0.8890-0.0795		0.889-0.079	Image	6.6 GHz (II);				NRAOVLA	0.020	0.86 x 0.29	13	+CH₃OH II	SFR		2015 July 09
	+17 48 1.828	-28 13 2.861	-1.2 mas	-1.4 mas	0.888979	-0.079469		1	0.889-0.079			12.7 (0.1)	0.12 (0.02)	0.03 (0.03)
10	+17 46 52.826	-28 07 35.439			0.835566	0.184454	G0.8358+0.1844		0.836+0.184	Image	6.6 GHz (II);				NRAOVLA	0.070	0.86 x 0.29	13	+H₂O +CH₃OH II	SFR		2015 July 09
	+17 46 52.826	-28 07 35.439	1.2 mas	0.6 mas	0.835566	0.184454		1	0.836+0.184			3.6 (0.1)	3.14 (0.05)	1.24 (0.04)
11	+17 47 54.383	-28 17 9.354			0.816239	-0.091465	G0.8162-0.0915		0.816-0.091	Image	6.6 GHz (II);				NRAOVLA	0.010	0.86 x 0.29	13	+CH₃OH II	SFR		2015 July 09
	+17 47 54.383	-28 17 9.354	-0.6 mas	1.2 mas	0.816239	-0.091465		1	0.816-0.091			71.2 (0.1)	0.08 (0.01)	0.05 (0.02)
12	+17 47 24.741	-28 21 43.297			0.694869	-0.037797	G0.6948-0.0378		0.695-0.038	Image	6.6 GHz (II);				NRAOVLA	0.750	0.86 x 0.29	13	-H₂O +CH₃OH II +OH	SFR		2015 July 09
	+17 47 24.741	-28 21 43.297	-1.8 mas	0.2 mas	0.694869	-0.037797		1	0.695-0.038			68.2 (0.1)	11.84 (0.85)	18.90 (3.70)
13	+17 47 18.655	-28 22 54.493			0.666396	-0.028954	G0.6665-0.0349		0.666-0.029	Image	6.6 GHz (II);				NRAOVLA	0.390	0.86 x 0.29	13	+H₂O +CH₃OH I +CH₃OH II -OH +SiO			2015 July 09
	+17 47 18.655	-28 22 54.493	0.6 mas	1.4 mas	0.666396	-0.028954		1	0.666-0.029			70.5 (0.1)	24.50 (6.40)	13.1 (5.3)
	+17 47 18.655	-28 22 54.493	0.6 mas	1.4 mas	0.666396	-0.028954		2	0.666-0.029			72.3 (0.1)	5.20 (1.30)	3.5 (1.4)
14	+17 47 18.654	-28 24 24.733			0.644952	-0.041935	G0.6449-0.0420		0.645-0.042	Image	6.6 GHz (II);				NRAOVLA	0.700	0.86 x 0.29	13	-H₂O +CH₃OH II +OH	SFR		2015 July 09
	+17 47 18.654	-28 24 24.733	0 mas	-1 mas	0.644952	-0.041935		1	0.645-0.042			49.5 (0.1)	36.10 (2.30)	47.8 (4.6)
	+17 47 18.654	-28 24 24.733	0 mas	-1 mas	0.644952	-0.041935		2	0.645-0.042			52.0 (0.1)	6.82 (0.97)	11.6 (9.8)
15	+17 45 54.06	-28 20 0.412			0.546656	0.261242	G0.547+0.261		0.547+0.261	Image	6.6 GHz (II);				NRAOVLA	0.070	0.86 x 0.29	13	+CH₃OH II	SFR_MIXED		2015 July 09
	+17 45 54.06	-28 20 0.412	0 mas	0.8 mas	0.546656	0.261242		1	0.547+0.261			-0.2 (0.1)	2.36 (0.15)	5.47 (0.68)
	+17 45 54.06	-28 20 0.412	0 mas	0.8 mas	0.546656	0.261242		2	0.547+0.261			-7.5 (0.1)	0.56 (0.12)	0.40 (0.19)
16	+17 47 38.819	-28 35 7.443			0.530437	-0.197538	G0.5304-0.1975		0.530-0.198		6.6 GHz (II);				NRAOVLA	0.020	0.86 x 0.29	13	+CH₃OH II	EVOLVED		2015 July 09
	+17 47 38.819	-28 35 7.443	-0.6 mas	0.6 mas	0.530437	-0.197538		1	0.530-0.198			49.4 (0.1)	0.21 (0.02)	0.34 (0.04)
17	+17 46 3.989	-28 24 49.675			0.496983	0.188346	G0.4964+0.1880		0.497+0.188	Image	6.6 GHz (II);				NRAOVLA	0.160	0.86 x 0.29	13	+H₂O +CH₃OH II +OH	SFR		2015 July 09
	+17 46 3.989	-28 24 49.675	-0.6 mas	1.4 mas	0.496983	0.188346		1	0.497+0.188			-10.1 (0.4)	4.03 (0.64)	2.48 (0.64)
18	+17 46 04	-28 24 51.899			0.496476	0.18799	G0.4964+0.1880		0.496+0.188		6.6 GHz (II);				NRAOVLA	0.090	0.86 x 0.29	13	+H₂O +CH₃OH II +OH	SFR		2015 July 09
	+17 46 04	-28 24 51.899	-1.2 mas	-1.4 mas	0.496476	0.187990		1	0.496+0.188			0.9 (0.1)	76.10 (6.60)	39.60 (5.40)
	+17 46 04	-28 24 51.899	-1.2 mas	-1.4 mas	0.496476	0.187990		2	0.496+0.188			-7.4 (0.1)	2.77 (0.41)	3.46 (0.80)
19	+17 47 9.114	-28 46 16.009			0.315332	-0.200814	G0.315-0.201		0.315-0.201	Image	6.6 GHz (II);				NRAOVLA	0.590	0.86 x 0.29	13	-CH₃OH I +CH₃OH II +OH	SFR		2015 July 09
	+17 47 9.114	-28 46 16.009	0 mas	1.4 mas	0.315332	-0.200814		1	0.315-0.201			18.3 (0.1)	14.60 (1.10)	8.7 (1.1)
20	+17 46 7.678	-28 45 20.39			0.212028	-0.001009	G0.2118-0.0009		0.212-0.001		6.6 GHz (II);				NRAOVLA	0.060	0.86 x 0.29	13	+H₂O +CH₃OH I +CH₃OH II	SFR_MIXED		2015 July 09
	+17 46 7.678	-28 45 20.39	-1.2 mas	0.4 mas	0.212028	-0.001009		1	0.212-0.001			49.3 (0.1)	1.056 (0.08)	1.19 (0.14)
21	+17 46 4.183	-29 12 25.54			359.81985	-0.224948	G359.820-0.225		359.820-0.225	Image	6.6 GHz (II);				NRAOVLA	0.010	0.86 x 0.29	13	+CH₃OH II	UNK		2015 July 09
	+17 46 4.183	-29 12 25.54	0.6 mas	-1.6 mas	359.819850	-0.224948		1	359.820-0.225			19.6 (0.1)	0.17 (0.02)	0.09 (0.021)
22	+17 44 24.806	-29 00 22.806			359.802377	0.188433	G359.8024+0.1884		359.802+0.188		6.6 GHz (II);				NRAOVLA	0.030	0.86 x 0.29	13	+CH₃OH II	UNK		2015 July 09
	+17 44 24.806	-29 00 22.806	1.2 mas	0 mas	359.802377	0.188433		1	359.802+0.188			17.5 (0.1)	0.23 (0.03)	0.11 (0.02)
23	+17 45 45.811	-29 18 10.446			359.70328	-0.217787	G359.703-0.218		359.703-0.218	Image	6.6 GHz (II);				NRAOVLA	0.240	0.86 x 0.29	13	+CH₃OH II	SFR		2015 July 09
	+17 45 45.811	-29 18 10.446	0.6 mas	1.2 mas	359.703280	-0.217787		1	359.703-0.218			19.5 (0.1)	7.53 (0.40)	3.87 (0.33)
	+17 45 45.811	-29 18 10.446	0.6 mas	1.2 mas	359.703280	-0.217787		2	359.703-0.218			23.6 (0.4)	0.67 (0.19)	2.08 (0.94)
24	+17 44 27.909	-29 29 31.299			359.394356	-0.07528	G359.3944-0.0753		359.394-0.075		6.6 GHz (II);				NRAOVLA	0.680	0.86 x 0.29	13	+CH₃OH II	SFR		2015 July 09
	+17 44 27.909	-29 29 31.299	1.8 mas	-1.8 mas	359.394356	-0.075280		1	359.394-0.075			-52.2 (0.1)	0.68 (0.04)	0.70 (0.06)
	+17 44 27.909	-29 29 31.299	1.8 mas	-1.8 mas	359.394356	-0.075280		2	359.394-0.075			-46.7 (0.1)	11.18 (0.05)	5.78 (0.04)
25	+17 43 25.672	-29 39 17.144			359.137562	0.031521	G359.137+0.031		359.138+0.032	Image	6.6 GHz (II);				NRAOVLA	0.440	0.86 x 0.29	13	-CH₃OH I +CH₃OH II +OH	SFR_MIXED		2015 July 09
	+17 43 25.672	-29 39 17.144	-1.2 mas	-0.8 mas	359.137562	0.031521		1	359.138+0.032			-3.8 (0.1)	13.20 (1.00)	10.62 (0.60)
26	+17 42 48.433	-29 45 55.095			358.972688	0.08807	G358.980+0.084		358.973+0.088	Image	6.6 GHz (II);				NRAOVLA	0.050	0.86 x 0.29	13	+H₂O -CH₃OH I +CH₃OH II	SFR		2015 July 09
	+17 42 48.433	-29 45 55.095	0.6 mas	-0.6 mas	358.972688	0.088070		1	358.973+0.088			-16.0 (0.1)	0.27 (0.04)	0.18 (0.04)
27	+17 43 10.031	-29 51 45.663			358.930915	-0.02955	G358.931-0.030		358.931-0.030	Image	6.6 GHz (II);				NRAOVLA	0.090	0.86 x 0.29	13	+H₂O +CH₃OH II	SFR_MIXED		2015 July 09
	+17 43 10.031	-29 51 45.663	-0.6 mas	-0.6 mas	358.930915	-0.029550		1	358.931-0.030			-18.7 (0.1)	1.74 (0.22)	1.2 (1.9)
	+17 43 10.031	-29 51 45.663	-0.6 mas	-0.6 mas	358.930915	-0.029550		2	358.931-0.030			-17.3 (0.1)	1.18 (0.14)	1.1 (1.4)
	+17 43 10.031	-29 51 45.663	-0.6 mas	-0.6 mas	358.930915	-0.029550		3	358.931-0.030			-16.0 (0.1)	3.10 (0.15)	1.52 (0.50)
28	+17 43 5.408	-29 59 45.583			358.808727	-0.085413	G358.809-0.085		358.809-0.085		6.6 GHz (II);				NRAOVLA	0.020	0.86 x 0.29	13	-H₂O +CH₃OH II	SFR		2015 July 09
	+17 43 5.408	-29 59 45.583	1.2 mas	-1 mas	358.808727	-0.085413		1	358.809-0.085			-56.8 (0.1)	1.85 (0.21)	3.78 (0.25)
	+17 43 5.408	-29 59 45.583	1.2 mas	-1 mas	358.808727	-0.085413		2	358.809-0.085			-51.9 (0.6)	0.20 (0.32)	0.18 (0.43)
29	+17 43 2.312	-30 05 29.942			358.721485	-0.126198	G358.721-0.126		358.721-0.126	Image	6.6 GHz (II);				NRAOVLA	0.040	0.86 x 0.29	13	-H₂O +CH₃OH II	SFR		2015 July 09
	+17 43 2.312	-30 05 29.942	1.2 mas	1.6 mas	358.721485	-0.126198		1	358.721-0.126			10.8 (0.1)	0.60 (0.02)	0.62 (0.04)
	+17 43 2.312	-30 05 29.942	1.2 mas	1.6 mas	358.721485	-0.126198		2	358.721-0.126			12.3 (0.1)	0.34 (0.02)	0.47 (0.06)
30	+17 40 37.16	-29 58 3.303			358.550387	0.383989	G358.550+0.384		358.550+0.384		6.6 GHz (II);				NRAOVLA	0.030	0.86 x 0.29	13	+CH₃OH II	EVOLVED		2015 July 09
	+17 40 37.16	-29 58 3.303	1.2 mas	-0.6 mas	358.550387	0.383989		1	358.550+0.384			-2.4 (0.1)	0.28 (0.04)	0.12 (0.03)
31	+17 40 48.193	-30 00 20.446			358.539189	0.330032	G358.539+0.330		358.539+0.330	Image	6.6 GHz (II);				NRAOVLA	0.030	0.86 x 0.29	13	+CH₃OH II	EVOLVED		2015 July 09
	+17 40 48.193	-30 00 20.446	0.6 mas	-1.6 mas	358.539189	0.330032		1	358.539+0.330			-36.0 (0.4)	0.27 (0.06)	0.01 (0.03)

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

select MAX(met2_data_all.ra_hms) as ra_hms,MAX(met2_data_all.dec_dms) as dec_dms,MAX(met2_data_all.source_name) as source_name,MAX(met2_data_all.ra) as ra,MAX(met2_data_all.dec) as dec,MAX(met2_data_all.l) as l,MAX(met2_data_all.b) as b,MAX(met2_data_all.grp) as grp,MAX(met2_data_all.other_name) as other_name,MAX(met2_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(met2_data_all.line) as line,MAX(met2_data_all.vrange) as vrange,MAX(met2_data_all.vpeak) as vpeak,MAX(met2_data_all.peak) as peak,MAX(met2_data_all.fwhm) as fwhm,MAX(met2_data_all.int) as int,MAX(met2_data_all.rms) as rms,MAX(met2_data_all.units) as units,MAX(met2_data_all.units_rms) as units_rms,MAX(met2_data_all.date_txt) as date_txt,MAX(met2_data_all.telescope_ref) as telescope_ref,MAX(met2_data_all.telescope_conf) as telescope_conf,MAX(met2_data_all.v_step) as v_step,MAX(met2_data_all.beam) as beam,MAX(met2_data_all.beam_maj) as beam_maj,MAX(met2_data_all.beam_min) as beam_min,MAX(met2_data_all.beam_pa) as beam_pa,MAX(met2_data_all.ref) as ref,MAX(met2_data_all.list_ref) as list_ref,MAX(met2_data_all.ascii) as ascii,MAX(met2_data_all.url) as url,MAX(met2_data_all.image) as image,MAX(met2_data_all.image2) as image2,MAX(met2_data_all.image3) as image3,MAX(met2_data_all.descr) as descr,MAX(met2_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(met2_data_all.dist) as dist,1 as dist_parallax,MAX(met2_data_all.date_txt) as date_txt,MAX(line_det) as line_det,MAX(type) as type,MAX(simbad_types_cat) as simbad_types_cat FROM met2_data_all  LEFT JOIN all_objects_withmet ON met2_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON met2_data_all.line=transitions."Line"  WHERE ref ilike 'RIC19' AND detected=true AND hide=false GROUP BY ref

select met2_data_all.ra_hms,met2_data_all.dec_dms,met2_data_all.source_name,met2_data_all.ra,met2_data_all.dec,met2_data_all.l,met2_data_all.b,met2_data_all.grp,met2_data_all.other_name,met2_data_all.other_desc,met2_data_all.thermal,met2_data_all.line,met2_data_all.vrange,met2_data_all.vpeak,met2_data_all.peak,met2_data_all.fwhm,met2_data_all.int,met2_data_all.rms,met2_data_all.units,met2_data_all.units_rms,met2_data_all.date_txt,met2_data_all.telescope_ref,met2_data_all.telescope_conf,met2_data_all.v_step,met2_data_all.beam,met2_data_all.beam_maj,met2_data_all.beam_min,met2_data_all.beam_pa,met2_data_all.ref,met2_data_all.list_ref,met2_data_all.ascii,met2_data_all.url,met2_data_all.image,met2_data_all.image2,met2_data_all.image3,met2_data_all.descr,met2_data_all.id,met2_data_all.mjy_flag,met2_data_all.rms_mjy_flag,met2_data_all.dist,met2_data_all.dist_parallax,met2_data_all.date_txt,line_det,type,simbad_types_cat FROM met2_data_all   LEFT JOIN all_objects_withmet ON met2_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON met2_data_all.line=transitions."Line"  WHERE ref ilike 'RIC19' AND detected=true AND hide=false ORDER BY detected DESC,id

Display data from paper

RIC19 - A 6.7 GHz methanol maser survey of the central molecular zone

Interferometry data

View as list of objects

Detection table from Rickert et al. (2019)