First results with a transmission echelle grating on the ESO Faint Object Spectrograph - Observations of the SN 1986a in NGC 3367 and of the nucleus of the galaxy

Details First results with a transmission echelle grating on the ESO Faint Object Spectrograph - Observations of the SN 1986a in NGC 3367 and of the nucleus of the galaxy First results with a transmission echelle grating on the ESO Faint Object Spectrograph - Observations of the SN 1986a in NGC 3367 and of the nucleus of the galaxy

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...189..353d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 189, no. 1-2, Jan. 1988, p. 353-360.

Astronomy and Astrophysics

Astrophysics

24

Active Galactic Nuclei, Astronomical Spectroscopy, Barred Galaxies, Echelle Gratings, Faint Object Camera, Supernovae, Balmer Series, Charge Coupled Devices, Forbidden Transitions, Interstellar Gas, Sodium

Scientific paper

The characteristics of a 79 lines/mm transmission echelle grating mounted on the ESO Faint Object Spectrograph and Camera (EFOSC) are presented. In combination with a cross disperser grism, this new grating gives on a single CCD frame spectra at a resolving power of about 2000. Two different cross-dispersers are used to select the λλ4000-7500 Å and λλ5500-9500 Å regions respectively. The peak efficiency of the echelle is 44%. The measured global efficiency of the 3.6 m telescope + instrument (echelle mode) + detector is such that 1 photon s-1 Å-1 is detected from a star of mv = 17. Observations of the type I SN 1986a in the spiral galaxy NGC 3367 and of the Seyfert-like nucleus of the same galaxy were obtained during the tests of the echelle grating. The B and V magnitudes of the SN and of the stellar nucleus of the galaxy were measured from CCD frames of the galaxy. For the supernova and the nucleus, mv =14.55 and 14.50 respectively on Feb. 19.1, 1986, U.T. The SN shows a type I spectrum. Two narrow and faint (EW ≃ 300 mÅ) absorption features in the spectrum of the SN are attributed to Na I interstellar gas in the disc of the galaxy, indicating that the SN is either within the disc or on the far side of it with respect to the observer. The spectrum of the nucleus shows strong emission lines in the Balmer series of hydrogen, and the forbidden lines of [O III] and [N II]. The profiles are broad and asymmetrically extended toward the blue.

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