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Nuclear versus integrated spectroscopy of galaxies in the Herschel Reference Survey
- Source :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, 2018, 615, pp.A104. ⟨10.1051/0004-6361/201832631⟩, Astronomy and Astrophysics-A&A, EDP Sciences, 2018, 615, pp.A104. ⟨10.1051/0004-6361/201832631⟩
- Publication Year :
- 2018
- Publisher :
- EDP Sciences, 2018.
-
Abstract
- Context. The determination of the relative frequency of active galactic nuclei (AGN) versus other spectral classes, for example, HII region-like (HII), transition objects (TRAN), passive (PAS), and retired (RET), in a complete set of galaxies in the local Universe is of primary importance to discriminate the source of ionization in the nuclear region of galaxies. Aims. Here we aim to provide a spectroscopic characterization of the nuclei of galaxies belonging to the Herschel Reference Survey (HRS), a volume and magnitude limited sample representative of the local Universe, which has become a benchmark for local and high-z studies, for semianalytical models and cosmological simulations. The comparison between the nuclear spectral classification and the one determined on the global galactic scale provides information about how galaxy properties change from the nuclear to the outer regions. Moreover, the extrapolation of the global star formation (SF) properties from the SDSS fiber spectroscopy compared to the one computed by Halpha photometry can be useful for testing the method based on aperture correction for determining the global star formation rate (SFR) for local galaxies. Methods. By collecting the existing nuclear spectroscopy available from the literature, complemented with new observations obtained using the Loiano 1.52m telescope, we analyze the 322 nuclear spectra of HRS galaxies. Results. Using two diagnostic diagrams (the BPT and the WHAN) we provide a nuclear and an integrated spectral classification for the HRS galaxies. Conclusions. We find that the fraction of AGNs increases with stellar mass, such that at logM > 10.0 M\odot or 66% of the LTGs are AGNs or TRAN.<br />21 pages
- Subjects :
- Active galactic nucleus
Stellar mass
[SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]
Population
Galaxies: fundamental parameter
FOS: Physical sciences
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
Stellar classification
01 natural sciences
0103 physical sciences
Astrophysics::Solar and Stellar Astrophysics
education
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
Physics
Supermassive black hole
education.field_of_study
Galaxies: star formation
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]
010308 nuclear & particles physics
Star formation
Galaxies: evolution
Astronomy and Astrophysics
Astrophysics - Astrophysics of Galaxies
Virgo Cluster
Galaxy
[SDU]Sciences of the Universe [physics]
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
Astrophysics::Earth and Planetary Astrophysics
Subjects
Details
- ISSN :
- 14320746 and 00046361
- Volume :
- 615
- Database :
- OpenAIRE
- Journal :
- Astronomy & Astrophysics
- Accession number :
- edsair.doi.dedup.....51abc3f5a0d16efba064b287f7c734ff