N. Vale Asari
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View article: The competing effects of recent and long-term star formation histories on oxygen, nitrogen, and stellar metallicities
The competing effects of recent and long-term star formation histories on oxygen, nitrogen, and stellar metallicities Open
The fundamental metallicity relation (FMR) – the three-way trend between galaxy stellar masses, star-formation rates (SFRs) and gaseous metallicities – remains amongst the most studied extragalactic relations. Furthermore, metallicity corr…
View article: The competing effects of recent and long-term star formation histories on oxygen, nitrogen, and stellar metallicities
The competing effects of recent and long-term star formation histories on oxygen, nitrogen, and stellar metallicities Open
The fundamental metallicity relation (FMR) - the three-way trend between galaxy stellar masses, star-formation rates (SFRs) and gaseous metallicities - remains amongst the most studied extragalactic relations. Furthermore, metallicity corr…
View article: Optically active and optically inactive radio galaxies as sub-populations of the main galaxy sample of the SDSS
Optically active and optically inactive radio galaxies as sub-populations of the main galaxy sample of the SDSS Open
Aims. We use the ROGUE I and II catalogues of radio sources associated with optical galaxies to revisit the characterization of radio active galactic nuclei (AGNs) in terms of radio luminosities and properties derived from the analyses of …
View article: Optically active and optically inactive radio galaxies as sub-populations of the main galaxy sample of the SDSS
Optically active and optically inactive radio galaxies as sub-populations of the main galaxy sample of the SDSS Open
We use the ROGUE I and II catalogues of radio sources associated with optical galaxies to revisit the characterization of radio active galactic nuclei (AGNs) in terms of radio luminosities and properties derived from the analyses of the op…
View article: A tight N/O–potential relation in star-forming galaxies
A tight N/O–potential relation in star-forming galaxies Open
We report a significantly tighter trend between gaseous N/O and $M_*/R_\mathrm{ e}$ (a proxy for gravitational potential) than has previously been reported between gaseous metallicity and $M_*/R_\mathrm{ e}$, for star-forming galaxies in t…
View article: A tight N/O-potential relation in star-forming galaxies
A tight N/O-potential relation in star-forming galaxies Open
We report a significantly tighter trend between gaseous N/O and $M_*/R_e$ (a proxy for gravitational potential) than has previously been reported between gaseous metallicity and $M_*/R_e$, for star-forming galaxies in the MaNGA survey. We …
View article: SDSS-IV MaNGA: how do star formation histories affect gas-phase abundances?
SDSS-IV MaNGA: how do star formation histories affect gas-phase abundances? Open
Gas-phase abundances in galaxies are the products of those galaxies’ evolutionary histories. The star formation history (SFH) of a region might therefore be expected to influence that region’s present day gaseous abundances. Here, we emplo…
View article: SDSS-IV MaNGA: how do star-formation histories affect gas-phase abundances?
SDSS-IV MaNGA: how do star-formation histories affect gas-phase abundances? Open
Gas-phase abundances in galaxies are the products of those galaxies' evolutionary histories. The star-formation history (SFH) of a region might therefore be expected to influence that region's present day gaseous abundances. Here, we emplo…
View article: A Machine Learning Approach to Galactic Emission-Line Region Classification
A Machine Learning Approach to Galactic Emission-Line Region Classification Open
Diagnostic diagrams of emission-line ratios have been used extensively to categorize extragalactic emission regions; however, these diagnostics are occasionally at odds with each other due to differing definitions. In this work, we study t…
View article: A machine learning approach to galactic emission-line region classification
A machine learning approach to galactic emission-line region classification Open
Diagnostic diagrams of emission-line ratios have been used extensively to categorize extragalactic emission regions; however, these diagnostics are occasionally at odds with each other due to differing definitions. In this work, we study t…
View article: Planetary Nebulae and the Ionization of the Interstellar Medium in Galaxies
Planetary Nebulae and the Ionization of the Interstellar Medium in Galaxies Open
We discuss the role of planetary nebulae and their progeny in galaxy context in terms of ionization of the galaxy interstellar medium. This regards ionized gas outside the disk of spiral galaxies, the diffuse ionized medium in spiral galax…
View article: The DIVING3D survey – Deep Integral Field Spectrograph View of Nuclei of Galaxies – I. Definition and sample presentation
The DIVING3D survey – Deep Integral Field Spectrograph View of Nuclei of Galaxies – I. Definition and sample presentation Open
We present the Deep Integral Field Spectrograph View of Nuclei of Galaxies (DIVING3D) survey, a seeing-limited optical 3D spectroscopy study of the central regions of all 170 galaxies in the Southern hemisphere with B < 12.0 and |b| >…
View article: A Machine-learning Approach to Integral Field Unit Spectroscopy Observations. III. Disentangling Multiple Components in H ii Regions
A Machine-learning Approach to Integral Field Unit Spectroscopy Observations. III. Disentangling Multiple Components in H ii Regions Open
In the first two papers of this series, we demonstrated the dynamism of machine learning applied to optical spectral analysis by using neural networks to extract kinematic parameters and emission-line ratios directly from the spectra obser…
View article: The role of the diffuse ionized gas in metallicity calibrations
The role of the diffuse ionized gas in metallicity calibrations Open
Estimates of gas-phase abundances based on strong-line methods have been calibrated for H~{\scshape ii} regions. Those methods ignore any contribution from the diffuse ionized gas (DIG), which shows enhanced collisional-to-recombination li…
View article: Analyzing the Kinematics of SITELLE Spectra using Machine Learning
Analyzing the Kinematics of SITELLE Spectra using Machine Learning Open
We describe the first paper in a series of works in which we explore the application of different machine learning algorithms to the spectral analysis of extra galactic emission regions. We discuss the creation of synthetic spectra replica…
View article: A Machine-learning Approach to Integral Field Unit Spectroscopy Observations. II. H ii Region Line Ratios
A Machine-learning Approach to Integral Field Unit Spectroscopy Observations. II. H ii Region Line Ratios Open
In the first paper of this series, we demonstrated that neural networks can robustly and efficiently estimate kinematic parameters for optical emission-line spectra taken by SITELLE at the Canada–France–Hawaii Telescope. This paper expands…
View article: Identifying Radio-active Galactic Nuclei among Radio-emitting Galaxies
Identifying Radio-active Galactic Nuclei among Radio-emitting Galaxies Open
Basing our analysis on ROGUE I, a catalog of over 32,000 radio sources associated with optical galaxies, we provide two diagnostics to select the galaxies where the radio emission is dominated by an active galactic nucleus (AGN), referred …
View article: Less than the sum of its parts: the dust-corrected H <i>α</i> luminosity of star-forming galaxies explored at different spatial resolutions with MaNGA and MUSE
Less than the sum of its parts: the dust-corrected H <i>α</i> luminosity of star-forming galaxies explored at different spatial resolutions with MaNGA and MUSE Open
The H α and H β emission-line luminosities measured in a single integrated spectrum are affected in non-trivial ways by point-to-point variations in dust attenuation in a galaxy. This work investigates the impact of this variation when est…
View article: The dust-corrected Ha luminosity of star-forming galaxies explored with MaNGA
The dust-corrected Ha luminosity of star-forming galaxies explored with MaNGA Open
Data tables for MaNGA global results from Vale Asari et al. 2020 (arXiv:2007.05544).
View article: The dust-corrected Ha luminosity of star-forming galaxies explored with MaNGA
The dust-corrected Ha luminosity of star-forming galaxies explored with MaNGA Open
Data tables for MaNGA global results from Vale Asari et al. 2020 (arXiv:2007.05544).
View article: Clues on the history of early-type galaxies from SDSS spectra and <i>GALEX</i> photometry
Clues on the history of early-type galaxies from SDSS spectra and <i>GALEX</i> photometry Open
Stellar population studies of early-type galaxies (ETGs) based on their optical stellar continuum suggest that these are quiescent systems. However, emission lines and ultraviolet photometry reveal a diverse population. We use a new versio…
View article: SIGNALS: I. Survey description
SIGNALS: I. Survey description Open
SIGNALS, the Star formation, Ionized Gas, and Nebular Abundances Legacy Survey, is a large observing programme designed to investigate massive star formation and H ii regions in a sample of local extended galaxies. The programme will use t…
View article: Diffuse ionized gas and its effects on nebular metallicity estimates of star-forming galaxies
Diffuse ionized gas and its effects on nebular metallicity estimates of star-forming galaxies Open
We investigate the impact of the diffuse ionized gas (DIG) on abundance determinations in star-forming (SF) galaxies. The DIG is characterized using the H α equivalent width (WH α). From a set of 1 409 SF galaxies from the Mapping Nearby G…
View article: Radio galaxies with and without emission lines
Radio galaxies with and without emission lines Open
Using the recent ROGUE I catalogue of galaxies with radio cores (Kozie_l-Wierzbowska et al. 2020) and after selecting the objects which are truly radio active galactic nuclei, AGNs, (which more than doubles the samples available so far), w…
View article: Simultaneous analysis of SDSS spectra and<i>GALEX</i>photometry with<scp>starlight</scp>: method and early results
Simultaneous analysis of SDSS spectra and<i>GALEX</i>photometry with<span>starlight</span>: method and early results Open
We combine data from the Sloan Digital Sky Survey (SDSS) and the Galaxy Evolution Explorer (GALEX) to simultaneously analyse optical spectra and ultraviolet photometry of 231 643 galaxies with the STARLIGHT spectral synthesis code using st…
View article: Why do many early-type galaxies lack emission lines? I. Fossil clues
Why do many early-type galaxies lack emission lines? I. Fossil clues Open
Early-type retired galaxies (RGs, i.e. galaxies which no longer form stars) can be divided into two classes: those with no emission lines, here dubbed lineless RGs, and those with emission lines, dubbed liny RGs. Both types of galaxies con…
View article: Diffuse ionized gas in galaxies across the Hubble sequence at the CALIFA resolution
Diffuse ionized gas in galaxies across the Hubble sequence at the CALIFA resolution Open
We use spatially resolved spectroscopy from the Calar Alto Legacy Field Area\n(CALIFA) survey to study the nature of the line emitting gas in galaxies of\ndifferent Hubble types, focusing on the separation of star-forming (SF) regions\nfro…
View article: Diffuse ionized gas in galaxies across the Hubble sequence at the CALIFA resolution
Diffuse ionized gas in galaxies across the Hubble sequence at the CALIFA resolution Open
We use spatially resolved spectroscopy from the Calar Alto Legacy Field Area (CALIFA) survey to study the nature of the line emitting gas in galaxies of different Hubble types, focusing on the separation of star-forming (SF) regions from t…
View article: Pair-Matching of Radio-Loud and Radio-Quiet AGNs
Pair-Matching of Radio-Loud and Radio-Quiet AGNs Open
A comparison study of host galaxy properties of radio-loud and radio-quiet AGNs.
View article: What Distinguishes the Host Galaxies of Radio-loud and Radio-quiet AGNs?
What Distinguishes the Host Galaxies of Radio-loud and Radio-quiet AGNs? Open
We compare the optical properties of the host galaxies of radio-quiet (RQ) and radio-loud (RL) Type 2 active galactic nuclei (AGNs) to infer whether the jet production efficiency depends on the host properties or is determined just by intr…