Bibcode
Mason, R. E.; Rodríguez-Ardila, A.; Martins, L.; Riffel, R.; González Martín, O.; Ramos Almeida, C.; Ruschel Dutra, D.; Ho, L. C.; Thanjavur, K.; Flohic, H.; Alonso-Herrero, A.; Lira, P.; McDermid, R.; Riffel, R. A.; Schiavon, R. P.; Winge, C.; Hoenig, M. D.; Perlman, E.
Bibliographical reference
The Astrophysical Journal Supplement Series, Volume 217, Issue 1, article id. 13, 27 pp. (2015).
Advertised on:
3
2015
Citations
60
Refereed citations
57
Description
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 (L 2-10 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.
Related projects
Nuclear Activity in Galaxies: a 3D Perspective from the Nucleus to the Outskirts
This project consists of two main research lines. First, the study of quasar-driven outflows in luminous and nearby obscured active galactic nuclei (AGN) and the impact that they have on their massive host galaxies (AGN feedback). To do so, we have obtained Gran Telescopio CANARIAS (GTC) infrared and optical observations with the instruments
Cristina
Ramos Almeida