M82 - The saga continues

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Abstract

view Abstract Citations (103) References (65) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS M82: The Saga Continues McLeod, K. K. ; Rieke, G. H. ; Rieke, M. J. ; Kelly, D. M. Abstract We present new near-infrared observations of the starburst galaxy M 82, including high-resolution J, H, and K imagery, 1-5 micron spectrophotometry and photometry, and 1.05-1.35 micron spectroscopy. These measurements are used to examine the Stellar population in the galaxy and conditions in the interstellar medium. We combine our observations with results from the literature to derive a new set of constraints for starburst models, which are presented in a companion paper. Our measurements of Paschen line fluxes in combination with the strengths of other recombination lines allow study of the reddening in M 82. We find that a uniform foreground screen model for the dust geometry cannot explain the relative line strengths. A variety of other models can fit the data reasonably well, such as a nonuniform foreground screen or a homogeneous mix of dust and gas. The derived properties of the galaxy are not strongly dependent on which of these models is selected; we derive an ionizing flux of ~10^54^ s^-1^ and an absolute magnitude of the starburst region of M_K_ 10^4.5^ cm^-3^ in the [Fe II] emission region. The [Fe II] line fluxes are consistent with excitation by fast shocks incident on dense gas. We report the tentative detection of several lines of H_2_, which, if confirmed, implicate UV fluorescence as the excitation mechanism. Publication: The Astrophysical Journal Pub Date: July 1993 DOI: 10.1086/172905 Bibcode: 1993ApJ...412..111M Keywords: Astronomical Models; Astronomical Photometry; Astronomical Spectroscopy; Galactic Nuclei; Starburst Galaxies; Cosmic Dust; Emission Spectra; Galactic Rotation; Interstellar Extinction; Interstellar Gas; Stellar Temperature; Supernovae; Astrophysics; GALAXIES: INDIVIDUAL MESSIER NUMBER: M82; GALAXIES: ISM; GALAXIES: PHOTOMETRY; GALAXIES: STARBURST; ISM: DUST; EXTINCTION; INFRARED: GALAXIES; ISM: MOLECULES full text sources ADS | data products SIMBAD (1) NED (1)

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