Discovery of optical candidate supernova remnants in Sagittarius

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Table 1

Imaging and spectral log.

Imaging

Filter	λ_c	Δλ	Total exp. time	Telescope
	(Å)	(Å)	(s)

Hα + [N ii] 6548 & 6584 Å	6570	75	4800 (2)^a	0.3 m Skinakas
[O iii] 5007 Å	5005	28	4800 (2)	0.3 m Skinakas
[S ii] 6716 & 6731 Å	6720	18	4800 (2)	0.3 m Skinakas
Cont blue	5470	230	180	0.3 m Skinakas
Cont red	6096	134	180	0.3 m Skinakas
Hα + [N ii] 6548 & 6584 Å		80	10 800	1.2 m AAO/UKST

Spectroscopy

Slit position	Slit centers		Offset^b	Aperture length^c
	α	δ
	(h m s)	(°′′′)	(arcsec)	(arcsec)

1a	18 29 09	−16 31 32	2.4 N	10.6
1b	18 29 09	−16 31 32	28.9 S	18.9
2a	18 28 58	−16 36 00	95.0 N	26.0
2b	18 28 58	−16 36 00	70.2 N	11.8
2c	18 28 58	−16 36 00	19.5 N	13.0
3a	18 28 49	−16 24 55	137.5 N	27.1
3b	18 28 49	−16 24 55	33.6 N	43.6
3c	18 28 49	−16 24 55	20.1 S	23.6
4	18 29 55	−16 34 12	16.6 S	30.7
5	18 28 42	−16 15 02	37.2 S	60.2
6a	18 27 41	−16 17 39	74.3 S	30.7
6b	18 27 41	−16 17 39	116.2 S	20.0
7	18 27 26	−16 07 50	32.4 N	31.9
8	18 26 12	−16 01 58	27.7 N	23.6

Notes.

^(a)

Numbers in parentheses represent the number of individual frames.

^(b)

Spatial offset from the slit center in arcsec: N( = North), S( = South).

^(c)

Aperture lengths for each area in arcsec.

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