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The nuclear near-infrared spectral properties of nearby galaxies

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The nuclear near-infrared spectral properties of nearby galaxies

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Título The nuclear near-infrared spectral properties of nearby galaxies
Autor Mason, Rachel E.
Rodriguez-Ardila, Alberto
Martins, Lucimara Pires
Riffel, Rogério
Gonzalez Martin, Omaira
Ramos Almeida, Cristina
Dutra, Daniel Ruschel
Ho, Luis C.
Thanjavur, Karun
Flohic, Helene
Alonso-Herrero, Almudena
Lira, Paulina
McDermid, Richard
Riffel, Rogemar André
Schiavon, Ricardo P.
Winge, Claudia
Hoenig, Michael D.
Perlman, Eric
Abstract We present spectra of the nuclear regions of 50 nearby (D = 1–92 Mpc, median = 20 Mpc) galaxies of morphological types E to Sm. The spectra, obtained with the Gemini Near-IR Spectrograph on the Gemini North telescope, cover a wavelength range of approximately 0.85–2.5 μm at R ∼ 1300–1800. There is evidence that most of the galaxies host an active galactic nucleus (AGN), but the range of AGN luminosities (log (L2-10 keV [erg s−1]) = 37.0–43.2) in the sample means that the spectra display a wide variety of features. Some nuclei, especially the Seyferts, exhibit a rich emission-line spectrum. Other objects, in particular the type 2 Low Ionization Nuclear Emission Region galaxies, show just a few, weak emission lines, allowing a detailed view of the underlying stellar population. These spectra display numerous absorption features sensitive to the stellar initial mass function, as well as molecular bands arising in cool stars, and many other atomic absorption lines. We compare the spectra of subsets of galaxies known to be characterized by intermediate-age and old stellar populations, and find clear differences in their absorption lines and continuum shapes. We also examine the effect of atmospheric water vapor on the signal-to-noise ratio achieved in regions between the conventional NIR atmospheric windows, which are of potential interest to those planning observations of redshifted emission lines or other features affected by telluric H2O. Further exploitation of this data set is in progress, and the reduced spectra and data reduction tools are made available to the community.
Contido em The astrophysical journal. Supplement series. Chicago. Vol. 217, no. 1 (Mar.2015), 13, 27 p.
Assunto Deslocamento para o vermelho
Galáxias ativas
Nucleo galatico
[en] Figure set
[en] Galaxies: active
[en] Galaxies: nuclei
[en] Galaxies: seyfert
[en] Galaxies: stellar content
[en] Infrared: galaxies
[en] Supporting material: extended figure
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/126972
Arquivos Descrição Formato
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