Astronomy & Astrophysics

**Table 5:** Parameters of VLBA water maser features in core A. For each identified feature, Col. 1 indicates the harboring maser (sub) cluster; Cols. 2 and 3 the LSR velocity and the integrated flux density of the highest-intensity channel; Cols. 4 and 5 the positional (RA and Dec) offsets (with the associated errors), evaluated with respect to the derived absolute position of the reference feature ( $\alpha(J2000) = 18^{\rm h} 36^{\rm m} 12\hbox{$.\!\!^{\rm s}$ }5581$ , $\delta(J2000) = -7\hbox{$^\circ$ }12' 10\hbox{$.\!\!^{\prime\prime}$ }792$ ); Cols. 6-8 the projected components along the RA and Dec axes and the absolute value of the derived proper motions (together with the associated errors).
Cluster	$V_{\rm LSR}$	$F_{\rm int}$	$\Delta \alpha$	$\Delta \delta$	V_x	V_y	$V_{\rm mod}$
	(km s^-1)	(Jy)	(mas)	(mas)	(km s^-1)	(km s^-1)	(km s^-1)
A1N	112.3	94.4	$0.0 \pm 0.2$	$0.0 \pm 0.3$	$26 \pm 9$	$5 \pm 9$	$26 \pm 9$
A1N	112.4	58.6	$30.6 \pm 0.2$	$17.9 \pm 0.3$	$42 \pm 11$	$31 \pm 14$	$53 \pm 12$
A1N	110.8	54.7	$32.8 \pm 0.2$	$23.0 \pm 0.2$
A1N	112.9	44.9	$28.8 \pm 0.2$	$14.3 \pm 0.3$	$2 \pm 10$	$-20 \pm 13$	$20 \pm 13$
A1N	111.3	41.4	$-49.9 \pm 0.2$	$43.5 \pm 0.2$	$4 \pm 10$	$40 \pm 12$	$41 \pm 12$
A1N	110.5	21.5	$32.0 \pm 0.2$	$24.5 \pm 0.3$
A1N	112.9	15.2	$24.2 \pm 0.2$	$9.5 \pm 0.3$	$23 \pm 11$	$9 \pm 15$	$25 \pm 11$
A1N	111.1	14.5	$-66.5 \pm 0.2$	$50.2 \pm 0.2$	$0 \pm 10$	$40 \pm 12$	$40 \pm 12$
A1N	112.5	11.5	$31.0 \pm 0.2$	$18.0 \pm 0.2$
A1N	111.6	11.0	$31.8 \pm 0.2$	$22.6 \pm 0.3$
A1N	114.8	9.6	$23.3 \pm 0.2$	$6.6 \pm 0.3$	$14 \pm 12$	$-30 \pm 15$	$33 \pm 14$
A1N	110.1	9.4	$-23.1 \pm 0.2$	$46.7 \pm 0.2$	$10 \pm 11$	$44 \pm 13$	$45 \pm 12$
A1N	112.3	8.9	$32.1 \pm 0.2$	$30.1 \pm 0.5$
A1N	113.0	8.6	$27.0 \pm 0.2$	$13.6 \pm 0.2$	$11 \pm 11$	$-5 \pm 12$	$12 \pm 11$
A1N	112.4	8.3	$32.5 \pm 0.2$	$29.8 \pm 0.3$
A1N	112.5	7.8	$31.1 \pm 0.2$	$18.6 \pm 0.2$
A1N	113.2	7.3	$30.1 \pm 0.2$	$17.2 \pm 0.2$	$23 \pm 11$	$5 \pm 13$	$24 \pm 11$
A1N	118.1	6.9	$31.8 \pm 0.2$	$21.8 \pm 0.2$
A1N	113.0	6.7	$26.3 \pm 0.2$	$37.0 \pm 0.2$	$14 \pm 10$	$46 \pm 13$	$48 \pm 13$
A1N	114.4	6.6	$33.5 \pm 0.2$	$26.6 \pm 0.2$
A1N	116.3	6.6	$30.4 \pm 0.2$	$18.5 \pm 0.2$
A1N	111.0	6.5	$1.0 \pm 0.2$	$0.9 \pm 0.3$
A1N	111.5	4.7	$32.4 \pm 0.2$	$21.0 \pm 0.3$
A1N	111.8	4.6	$31.9 \pm 0.2$	$31.1 \pm 0.6$
A1N	115.8	4.2	$31.1 \pm 0.3$	$20.4 \pm 0.3$
A1N	111.4	4.2	$32.9 \pm 0.2$	$30.2 \pm 0.2$
A1N	114.6	3.9	$31.9 \pm 0.2$	$23.2 \pm 0.3$	$25 \pm 22$	$0 \pm 29$	$25 \pm 22$
A1N	115.1	3.6	$31.2 \pm 0.2$	$19.8 \pm 0.2$
A1N	114.4	3.5	$30.3 \pm 0.2$	$15.4 \pm 0.3$
A1N	113.9	3.5	$-1.3 \pm 0.2$	$-1.0 \pm 0.3$	$70 \pm 18$	$30 \pm 21$	$76 \pm 18$
A1N	112.5	3.5	$-28.4 \pm 0.2$	$45.5 \pm 0.3$	$10 \pm 11$	$44 \pm 13$	$45 \pm 13$
A1N	114.1	3.2	$-132.1 \pm 0.2$	$53.6 \pm 0.2$	$-5 \pm 12$	$29 \pm 12$	$30 \pm 12$
A1N	113.2	3.0	$24.1 \pm 0.2$	$8.6 \pm 0.2$
A1N	111.6	2.8	$29.4 \pm 0.2$	$34.8 \pm 0.2$	$30 \pm 21$	$-3 \pm 28$	$31 \pm 21$
A1N	113.2	2.6	$31.4 \pm 0.2$	$21.2 \pm 0.2$
A1N	110.6	2.6	$66.2 \pm 0.2$	$-113.9 \pm 0.3$	$11 \pm 10$	$31 \pm 13$	$33 \pm 12$
A1N	114.7	2.5	$27.6 \pm 0.2$	$36.6 \pm 0.2$
A1N	115.9	2.5	$31.6 \pm 0.2$	$21.9 \pm 0.3$
A1N	109.7	2.4	$32.5 \pm 0.2$	$27.7 \pm 0.4$
A1N	110.7	2.2	$32.7 \pm 0.2$	$28.4 \pm 0.3$
A1N	113.4	2.2	$30.9 \pm 0.2$	$34.0 \pm 0.3$
A1N	113.8	2.1	$30.2 \pm 0.2$	$15.5 \pm 0.3$	$40 \pm 11$	$-12 \pm 14$	$42 \pm 11$
A1N	109.0	2.1	$-3.9 \pm 0.2$	$6.1 \pm 0.3$	$4 \pm 22$	$18 \pm 29$	$18 \pm 29$
A1N	110.5	2.0	$-63.1 \pm 0.2$	$49.0 \pm 0.2$	$13 \pm 11$	$35 \pm 12$	$38 \pm 12$
A1N	113.9	1.9	$-123.8 \pm 0.2$	$53.5 \pm 0.2$	$4 \pm 11$	$33 \pm 12$	$33 \pm 12$
A1N	110.4	1.8	$66.7 \pm 0.2$	$-108.1 \pm 0.2$	$13 \pm 10$	$5 \pm 13$	$14 \pm 11$
A1N	108.3	1.7	$32.7 \pm 0.2$	$26.1 \pm 0.5$
A1N	117.8	1.7	$31.4 \pm 0.2$	$20.2 \pm 0.2$
A1N	110.2	1.6	$-23.8 \pm 0.2$	$46.9 \pm 0.2$	$7 \pm 10$	$43 \pm 13$	$44 \pm 12$
A1N	113.6	1.6	$-29.9 \pm 0.3$	$45.0 \pm 0.3$	$-6 \pm 15$	$38 \pm 13$	$38 \pm 13$
A1N	107.2	1.5	$32.8 \pm 0.2$	$27.8 \pm 0.2$
A1N	116.4	1.4	$30.7 \pm 0.2$	$32.1 \pm 0.4$	$62 \pm 22$	$30 \pm 35$	$69 \pm 25$
A1N	113.3	1.4	$30.5 \pm 0.2$	$33.4 \pm 0.3$
A1N	111.6	1.3	$32.8 \pm 0.2$	$25.6 \pm 0.3$
A1N	116.6	1.2	$30.9 \pm 0.2$	$32.9 \pm 0.3$
A1N	112.7	1.1	$27.0 \pm 0.2$	$6.9 \pm 0.3$
A1N	113.6	1.0	$28.6 \pm 0.2$	$35.4 \pm 0.3$	$25 \pm 16$	$62 \pm 20$	$67 \pm 19$
A1N	114.2	1.0	$9.7 \pm 0.2$	$44.4 \pm 0.2$
A1N	107.5	0.9	$-3.9 \pm 0.2$	$7.0 \pm 0.2$
A1N	108.4	0.9	$6.1 \pm 0.2$	$1.4 \pm 0.3$	$9 \pm 11$	$13 \pm 13$	$17 \pm 12$
A1N	113.7	0.6	$31.4 \pm 0.3$	$32.1 \pm 0.3$
A1N	117.6	0.6	$29.9 \pm 0.2$	$18.6 \pm 0.2$	$29 \pm 21$	$36 \pm 29$	$46 \pm 26$
A1N	108.6	0.5	$33.4 \pm 0.2$	$27.7 \pm 0.2$
A1N	114.7	0.4	$-117.0 \pm 0.2$	$55.2 \pm 0.2$	$-23 \pm 21$	$32 \pm 28$	$40 \pm 26$
A1N	105.6	0.4	$-159.8 \pm 0.2$	$88.2 \pm 0.3$
A1N	110.3	0.4	$-22.7 \pm 0.2$	$46.9 \pm 0.3$
A1N	114.8	0.4	$19.8 \pm 0.2$	$37.9 \pm 0.2$
A1N	109.4	0.4	$30.4 \pm 0.2$	$32.6 \pm 0.3$
A1N	116.2	0.3	$30.4 \pm 0.2$	$20.2 \pm 0.3$
A1N	108.7	0.3	$36.6 \pm 0.2$	$-100.0 \pm 0.2$	$21 \pm 11$	$18 \pm 13$	$28 \pm 12$
A1N	116.1	0.3	$32.9 \pm 0.2$	$27.0 \pm 0.3$
A1N	105.1	0.2	$-23.8 \pm 0.2$	$-79.5 \pm 0.3$	$-27 \pm 21$	$17 \pm 29$	$32 \pm 24$
A1N	110.3	0.2	$63.6 \pm 0.2$	$-82.2 \pm 0.3$	$12 \pm 11$	$24 \pm 13$	$27 \pm 12$
A1N	110.3	0.2	$63.7 \pm 0.2$	$-84.6 \pm 0.3$	$-8 \pm 21$	$35 \pm 28$	$36 \pm 28$
A1N	114.5	0.2	$27.7 \pm 0.2$	$11.3 \pm 0.3$
A1N	108.6	0.2	$5.4 \pm 0.2$	$1.1 \pm 0.3$
A1N	115.4	0.2	$18.7 \pm 0.2$	$-72.3 \pm 0.3$
A1N	109.7	0.2	$45.9 \pm 0.2$	$-141.1 \pm 0.2$
A1N	109.3	0.2	$-31.4 \pm 0.2$	$45.7 \pm 0.3$	$14 \pm 10$	$52 \pm 13$	$54 \pm 12$
A1N	107.3	0.1	$31.7 \pm 0.2$	$30.5 \pm 0.3$
A1N	115.5	0.1	$22.3 \pm 0.2$	$5.6 \pm 0.3$
A1N	117.6	0.1	$30.0 \pm 0.2$	$33.3 \pm 0.3$
A1N	107.5	0.1	$39.4 \pm 0.2$	$22.1 \pm 0.3$
A1N	107.7	0.1	$-24.2 \pm 0.2$	$44.6 \pm 0.3$
A1N	106.2	0.08	$30.5 \pm 0.2$	$32.5 \pm 0.3$
A1N	105.0	0.07	$-5.5 \pm 0.2$	$7.3 \pm 0.3$
A1N	116.7	0.05	$27.4 \pm 0.2$	$15.1 \pm 0.3$
A1N	91.6	0.05	$120.2 \pm 0.3$	$135.0 \pm 0.4$
A1S	107.5	11.3	$-369.4 \pm 0.2$	$-521.3 \pm 0.2$
A1S	107.7	2.1	$-368.2 \pm 0.2$	$-521.4 \pm 0.2$
A1S	106.1	0.8	$-368.4 \pm 0.2$	$-521.2 \pm 0.2$
A1S	109.8	0.6	$-397.4 \pm 0.2$	$-519.8 \pm 0.3$
A1S	109.4	0.4	$-397.2 \pm 0.2$	$-521.0 \pm 0.2$
A1S	109.9	0.3	$-397.8 \pm 0.2$	$-517.8 \pm 0.2$
A1S	109.2	0.2	$-395.9 \pm 0.2$	$-517.4 \pm 0.2$
A1S	108.5	0.1	$-396.2 \pm 0.2$	$-524.2 \pm 0.3$

A2	105.5	5.0	$-1165.7 \pm 0.2$	$647.2 \pm 0.2$	$17 \pm 11$	$5 \pm 12$	$18 \pm 11$
A2	106.7	0.9	$-1475.1 \pm 0.2$	$655.5 \pm 0.3$	$-10 \pm 11$	$12 \pm 14$	$16 \pm 12$
A2	106.4	0.8	$-1474.8 \pm 0.2$	$656.6 \pm 0.3$
A2	106.8	0.7	$-1325.0 \pm 0.2$	$636.9 \pm 0.3$
A2	105.5	0.5	$-1330.3 \pm 0.2$	$648.4 \pm 0.3$	$-3 \pm 10$	$25 \pm 13$	$25 \pm 13$
A2	105.7	0.5	$-1474.8 \pm 0.2$	$657.5 \pm 0.3$	$-3 \pm 10$	$5 \pm 14$	$6 \pm 13$
A2	105.9	0.1	$-1171.5 \pm 0.2$	$647.4 \pm 0.3$	$-6 \pm 16$	$7 \pm 15$	$9 \pm 15$
A/B	94.4	0.5	$720.2 \pm 0.2$	$-1182.1 \pm 0.3$	$10 \pm 11$	$57 \pm 13$	$58 \pm 13$
A/B	90.3	0.5	$721.6 \pm 0.2$	$-1182.8 \pm 0.2$	$-10 \pm 21$	$79 \pm 28$	$79 \pm 28$
A/B	93.5	0.4	$721.2 \pm 0.2$	$-1182.0 \pm 0.3$	$36 \pm 11$	$59 \pm 13$	$70 \pm 12$
A/B	90.2	0.3	$721.1 \pm 0.2$	$-1181.2 \pm 0.2$
A/B	89.9	0.3	$720.5 \pm 0.2$	$-1182.9 \pm 0.2$
A/B	95.4	0.2	$712.0 \pm 0.2$	$-1195.8 \pm 0.3$
A/B	92.6	0.1	$713.0 \pm 0.2$	$-1196.6 \pm 0.3$
A/B	90.6	0.1	$713.1 \pm 0.2$	$-1194.0 \pm 0.3$	$-4 \pm 10$	$36 \pm 13$	$36 \pm 13$
A/B	89.8	0.09	$712.9 \pm 0.2$	$-1195.3 \pm 0.2$

B	105.5	0.3	$1090.5 \pm 0.2$	$-2778.3 \pm 0.3$
B	105.5	0.3	$774.0 \pm 0.2$	$-2757.5 \pm 0.3$
B	101.5	0.2	$1107.0 \pm 0.2$	$-2882.8 \pm 0.3$
B	104.7	0.1	$1107.7 \pm 0.2$	$-2882.7 \pm 0.3$	$-90 \pm 22$	$60 \pm 30$	$109 \pm 25$
B	91.7	0.1	$1264.1 \pm 0.2$	$-2738.6 \pm 0.3$	$33 \pm 10$	$145 \pm 13$	$148 \pm 13$
B	92.7	0.06	$1361.2 \pm 0.3$	$-2865.8 \pm 0.2$

E	93.9	0.5	$-2388.2 \pm 0.2$	$-684.6 \pm 0.2$	$-15 \pm 21$	$24 \pm 28$	$28 \pm 27$
E	102.2	0.4	$-2389.9 \pm 0.2$	$-679.7 \pm 0.2$
E	104.9	0.2	$-2390.2 \pm 0.2$	$-680.4 \pm 0.3$
E	93.9	0.2	$-2387.9 \pm 0.2$	$-684.9 \pm 0.3$
E	93.7	0.2	$-2388.0 \pm 0.2$	$-685.4 \pm 0.2$
E	103.3	0.2	$-2381.6 \pm 0.2$	$-671.6 \pm 0.2$
E	102.9	0.2	$-2389.9 \pm 0.2$	$-679.9 \pm 0.3$	$7 \pm 22$	$54 \pm 29$	$55 \pm 28$
E	95.8	0.2	$-2388.5 \pm 0.2$	$-684.6 \pm 0.3$
E	103.0	0.2	$-2389.5 \pm 0.2$	$-677.4 \pm 0.3$
E	104.7	0.1	$-2390.6 \pm 0.2$	$-680.3 \pm 0.3$
E	97.7	0.1	$-2388.7 \pm 0.2$	$-684.9 \pm 0.2$

Source LaTeX | All tables | In the text