Spectral Classification of Ultrabright IR Galaxies from The IRAS PSC/FSC Combined Catalog

• Published in: Astrophysics 2019-12, Vol.62 (4), p.452-466
• Main Authors: Mikayelyan, G. A., Mickaelian, A. M., Abrahamyan, H. V., Paronyan, G. M., Gyulzadyan, M. V.
• Format: Article
• Language: English
• Subjects: Astronomy; Astrophysics and Astroparticles; Astrophysics and Cosmology; Galaxies; Identification and classification; Observations and Techniques; Physics; Physics and Astronomy; Space Exploration and Astronautics; Space Sciences (including Extraterrestrial Physics
• ISSN: 0571-7256; 1573-8191
• DOI: 10.1007/s10511-019-09595-2

Bright IR galaxies (LIRG, ULIRG, and HLIRG) are important for research on star formation processes in the early universe since they can be detected at large distances owing to their luminosity. High IR is indicative of active star formation and starburst (SB) processes, which are typical of HII regions. In many cases high IR is indicative of an active galactic nucleus (AGN). This raises the question of whether the SB causes the AGN or vice versa , or is there no direct interaction? Given that these objects are very often binary or multiple systems, it is also interesting to study the interrelations among SB, nuclear activity of the members of a system, and their interactions or mergers. With cross correlation of the IRAS PSC/FSC Combined Catalog and SDSS DR14, 114 ultrabright IR galaxies have been indentified and classified with respect to their types of activity. 1 BLL, 2 quasars, 29 Seyfert types 1.0-1.8, 5 Seyfert type 2, 14 LINERS, 36 HII regions, and 14 objects with composite spectra (Composites) have been identified and classified. Among the type 1 Seyfert galaxies there are many objects with narrow lines.