Dorado and its member galaxies - Hα imaging of the group backbone

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Volume 643 (November 2020)

A&A, 643 (2020) A176

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Table 1.

Hα narrow band observations.

Field	Telescope	Observing date	Exp. time	Filter	Scale	Seeing	Notes
ID			[s]	Ident.	[arcsec px⁻¹]	[arcsec]
NGC 1533	du Pont	Nov. 30/Dec. 1, 2018	900 × 3	716	0.259	0.94 ± 0.19	5 frames, FoV = 177²
			900 × 3	657	0.259		5 frames, FoV = 177²
NGC 1536	du Pont	Dec. 5, 2018	900 × 3	723	0.259	1.03 ± 0.05	1 frame FoV = 885²
			900 × 3	657	0.259		1 frame FoV = 885²
NGC 1543	du Pont	Dec. 3/5, 2018	900 × 3	723	0.259	0.96 ± 0.09	2 frames, FoV = 177 × 885
			900 × 3	657	0.259		2 frames, FoV = 177 × 885
NGC 1546	du Pont	Dec. 5, 2018	900 × 3	723	0.259	1.26 ± 0.05	1 frame FoV = 885²
			900 × 3	657	0.259		1 frame FoV = 885²
NGC 1549	du Pont	Dec. 2, 2018	900 × 3	716	0.259	0.95 ± 0.16	4 frames, FoV = 177²
			900 × 3	657	0.259		4 frames, FoV = 177²
NGC 1553	du Pont	Dec. 2, 2018	900 × 3	723	0.259	0.90 ± 0.06	4 frames, FoV = 177²
			900 × 3	657	0.259		4 frames, FoV = 177²
IC 2058	du Pont	Dec. 3, 2018	900 × 3	723	0.259	1.54 ± 0.05	1 frame FoV = 885²
			900 × 3	657	0.259		1 frame FoV = 885²
NGC 1566	Swope	Dec. 6, 2018	1200 × 3	723	0.435	1.60 ± 0.03	1 frame FoV = 297 × 298
			1200 × 3	657	0.435		1 frame FoV = 297 × 298
NGC 1581	Swope	Dec. 7, 2018	1200 × 3	723	0.435	1.67 ± 0.04	1 frame FoV = 297×298
			1200 × 3	657	0.435		1 frame FoV = 297 × 298
NGC 1596	du Pont	Dec. 5, 2018	900 × 3	723	0.259	1.63 ± 0.01	1 frame FoV = 885²
			900 × 3	657	0.259		1 frame FoV = 885²

Notes. Field ID refers to the main galaxy in the field. Column 2 reports the LCO Telescope used. Columns 3 and 4 report the observing date and the total reduced exposure time. Columns 5 and 6 quote the off-on Hα filters and the image scale. The FWHM of the filters Hα657, 716BP7 and 723BP10 are 77Å, 77Å and 109Å, respectively (see also Fig. 2). In Col. 7 the average seeing measured in the frames reported in the notes of column 8 which provides also the total field of view covered. Images are obtained using as GAIN = 1.54 e⁻ ADU⁻¹ and READOUT = 6.5 e⁻ for the SITe2K CCD @ du Pont; GAIN = 1.040 e⁻ ADU⁻¹ and READOUT = 3.0 e⁻ for the E2V CCD231-84 CCD @ Swope.

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