Panoramic spectroscopy of galaxies with star-formation regions. a study of SBS 1202 + 583

• Published in: Astrophysics Vol. 55; no. 1; pp. 1 - 13
• Main Authors: Hakopian, S. A., Balayan, S. K., Dodonov, S. N., Moiseev, A. V., Smirnova, A. A.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.03.2012; Springer; Springer Nature B.V
• Subjects: Analysis; Astronomy; Astrophysics; Astrophysics and Astroparticles; Astrophysics and Cosmology; Emissions; Galaxies; Ionization; Observations and Techniques; Physics; Physics and Astronomy; Space Exploration and Astronautics; Space Sciences (including Extraterrestrial Physics; Spectroscopy; Spectrum analysis; Star & galaxy formation; Stars; Sulfur; Surveys; Telescope; Armenia; H; SBS 1202 + 583; 3D spectroscopy; emission; HII regions– individual
• ISSN: 0571-7256; 1573-8191
• DOI: 10.1007/s10511-012-9209-x

The methods of panoramic (3D) spectroscopy are used by us in a detailed study of galaxies with ongoing star formation chosen from among objects in seven selected fields of the Second Byurakan Survey (SBS). This article deals with the irregular galaxy SBS 1202 + 583, which our classification scheme identifies as being in a continuous phase of star formation. Observations were made with the panoramic spectrographs MPFS at the 6-m telescope of the Special Astrophysical Observatory (SAO) of the Russian Academy of Sciences and VAGR at the 2.6-m telescope of the Byurakan Astrophysical Observatory (BAO) in Armenia. The data are used to construct maps of the radiative fluxes in the continuum and various emission lines. Special attention is devoted to analyzing the emission in the H α hydrogen recombination line and in the forbidden low-ionization doublets of nitrogen [NII] λλ 6548, 6583 and sulfur [SII] λλ 6716, 6731, and the ratios of the intensities of the forbidden lines to H α . The observable characteristics (size, H α fluxes, etc.) of nine HII regions are studied. The estimated current rates of star formation in the individual HII regions based on the H α fluxes lie within the range of 0.3-1.2 ⨀ M /year. The dependence of the ratio of the intensities of the emission in these above mentioned forbidden doublets on the rate of star formation in the HII regions is found.