scholarly journals Are Wolf-Rayet Stars Able to Pollute the Interstellar Medium of Galaxies? Results from Integral Field Spectroscopy

2013 ◽  
Vol 2013 ◽  
pp. 1-15 ◽  
Author(s):  
Enrique Pérez-Montero ◽  
Carolina Kehrig ◽  
Jarle Brinchmann ◽  
José M. Vílchez ◽  
Daniel Kunth ◽  
...  
Keyword(s):  
Direct Method ◽  
Spatial Scales ◽  
Strong Line ◽  
Chemical Abundances ◽  
Local Pollution ◽  
Integral Field Spectroscopy ◽  
Field Spectroscopy ◽  
Low Surface Brightness ◽  
Low Metallicity ◽  
Integral Field

We investigate the spatial distribution of chemical abundances in a sample of low metallicity Wolf-Rayet (WR) galaxies selected from the SDSS. We used the integral field spectroscopy technique in the optical spectral range (3700 Å–6850 Å) with PMAS attached to the CAHA 3.5 m telescope. Our statistical analysis of the spatial distributions of O/H and N/O, as derived using the direct method or strong-line parameters consistent with it, indicates that metallicity is homogeneous in five out of the six analysed objects in scales of the order of several kpc. Only in the object WR404 is a gradient of metallicity found in the direction of the low surface brightness tail. In contrast, we found an overabundance of N/O in spatial scales of the order of hundreds of pc associated with or close to the positions of the WR stars in 4 out of the 6 galaxies. We exclude possible hydrodynamical causes, such as the metal-poor gas inflow, for this local pollution by means of the analysis of the mass-metallicity relation (MZR) and mass-nitrogen-to-oxygen relation (MNOR) for the WR galaxies catalogued in the SDSS.

scholarly journals Ionization structure and chemical abundances of the Wolf-Rayet nebula NGC 6888 with integral field spectroscopy

2012 ◽  
Vol 541 ◽  
pp. A119 ◽  
Author(s):  
A. Fernández-Martín ◽  
D. Martín-Gordón ◽  
J. M. Vílchez ◽  
E. Pérez Montero ◽  
A. Riera ◽  
...  
Keyword(s):  
Chemical Abundances ◽  
Integral Field Spectroscopy ◽  
Field Spectroscopy ◽  
Ionization Structure ◽  
Integral Field

scholarly journals Investigating the Chemical Homogeneity of Low-Metallicity Blue Compact Dwarf Galaxies Using Integral Field Spectroscopy

2011 ◽  
Vol 48 ◽  
pp. 109-114 ◽  
Author(s):  
B.L. James ◽  
Y.G. Tsamis ◽  
M.J. Barlow ◽  
M.S. Westmoquette ◽  
J. Walsh ◽  
...  
Keyword(s):  
Dwarf Galaxies ◽  
Chemical Homogeneity ◽  
Integral Field Spectroscopy ◽  
Field Spectroscopy ◽  
Low Metallicity ◽  
Integral Field

scholarly journals Constraints on core-collapse supernova progenitors from explosion site integral field spectroscopy

2018 ◽  
Vol 613 ◽  
pp. A35 ◽  
Author(s):  
H. Kuncarayakti ◽  
J. P. Anderson ◽  
L. Galbany ◽  
K. Maeda ◽  
M. Hamuy ◽  
...  
Keyword(s):  
Stellar Population ◽  
Near Infrared ◽  
Stellar Populations ◽  
Star Formation History ◽  
Initial Mass ◽  
Strong Line ◽  
Core Collapse ◽  
Integral Field Spectroscopy ◽  
Field Spectroscopy ◽  
Integral Field

Context. Observationally, supernovae (SNe) are divided into subclasses according to their distinct characteristics. This diversity naturally reflects the diversity in the progenitor stars. It is not entirely clear, however, how different evolutionary paths leading massive stars to become an SN are governed by fundamental parameters such as progenitor initial mass and metallicity. Aims. This paper places constraints on progenitor initial mass and metallicity in distinct core-collapse SN subclasses through a study of the parent stellar populations at the explosion sites. Methods. Integral field spectroscopy (IFS) of 83 nearby SN explosion sites with a median distance of 18 Mpc has been collected and analysed, enabling detection and spectral extraction of the parent stellar population of SN progenitors. From the parent stellar population spectrum, the initial mass and metallicity of the coeval progenitor are derived by means of comparison to simple stellar population models and strong-line methods. Additionally, near-infrared IFS was employed to characterise the star formation history at the explosion sites. Results. No significant metallicity differences are observed among distinct SN types. The typical progenitor mass is found to be highest for SN type Ic, followed by type Ib, then types IIb and II. Type IIn is the least associated with young stellar populations and thus massive progenitors. However, statistically significant differences in progenitor initial mass are observed only when comparing SNe IIn with other subclasses. Stripped-envelope SN progenitors with initial mass estimates lower than 25 M⊙ are found; they are thought to be the result of binary progenitors. Confirming previous studies, these results support the notion that core-collapse SN progenitors cannot arise from single-star channels only, and both single and binary channels are at play in the production of core-collapse SNe. Near-infrared IFS suggests that multiple stellar populations with different ages may be present in some of the SN sites. As a consequence, there could be a non-negligible amount of contamination from old populations, and therefore the individual age estimates are effectively lower limits.

Mass and metallicity constraints on supernova progenitors derived from integral field spectroscopy of the environment

2011 ◽  
Vol 7 (S279) ◽  
pp. 343-344
Author(s):  
Hanindyo Kuncarayakti ◽  
Mamoru Doi ◽  
Greg Aldering ◽  
Nobuo Arimoto ◽  
Keiichi Maeda ◽  
...  
Keyword(s):  
Stellar Population ◽  
Star Cluster ◽  
Initial Mass ◽  
Strong Line ◽  
Reliable Determination ◽  
Integral Field Spectroscopy ◽  
Field Spectroscopy ◽  
Progenitor Stars ◽  
Integral Field

AbstractWe have obtained optical integral field spectroscopy of the explosion sites of more than 25 nearby type-IIP/IIL/Ib/Ic supernovae using UH88/SNIFS, and additionally Gemini/GMOS IFU. This technique enables us to obtain both spatial and spectral information of the immediate environment of the supernovae. Using strong line method we measured the metallicity of the star cluster present at the explosion site, presumably the coeval parent stellar population of the supernova progenitor, and comparison with simple stellar population models gives age estimate of the cluster. With this method we were able to put constraints on the metallicity and age of the progenitor star. The age, i.e. lifetime, of the progenitor corresponds to the initial mass of the star. By far this is the most direct measurement of supernova progenitor metallicity and, if the cluster-progenitor association is confirmed, provides reliable determination of the initial mass of supernova progenitor stars.

scholarly journals The SLUGGS Survey: A New Mask Design to Reconstruct the Stellar Populations and Kinematics of Both Inner and Outer Galaxy Regions

2016 ◽  
Vol 33 ◽  
Author(s):  
Nicola Pastorello ◽  
Duncan A. Forbes ◽  
Adriano Poci ◽  
Aaron J. Romanowsky ◽  
Richard McDermid ◽  
...  
Keyword(s):  
Spatial Scales ◽  
Stellar Populations ◽  
Large Field ◽  
Nearby Galaxy ◽  
Stellar Kinematics ◽  
Integral Field Spectroscopy ◽  
Field Spectroscopy ◽  
Mask Design ◽  
Field Unit ◽  
Integral Field

AbstractIntegral field unit spectrographs allow the 2D exploration of the kinematics and stellar populations of galaxies, although they are generally restricted to small fields-of-view. Using the large field-of-view of the DEIMOS multislit spectrograph on Keck and our Stellar Kinematics using Multiple Slits technique, we are able to extract sky-subtracted stellar light spectra to large galactocentric radii. Here, we present a new DEIMOS mask design named SuperSKiMS that explores large spatial scales without sacrificing high spatial sampling. We simulate a set of observations with such a mask design on the nearby galaxy NGC 1023, measuring stellar kinematics and metallicities out to where the galaxy surface brightness is orders of magnitude fainter than the sky. With this technique we also reproduce the results from literature integral field spectroscopy in the innermost galaxy regions. In particular, we use the simulated NGC 1023 kinematics to model its total mass distribution to large radii, obtaining comparable results with those from published integral field unit observation. Finally, from new spectra of NGC 1023, we obtain stellar 2D kinematics and metallicity distributions that show good agreement with integral field spectroscopy results in the overlapping regions. In particular, we do not find a significant offset between our Stellar Kinematics using Multiple Slits and the ATLAS3D stellar velocity dispersion at the same spatial locations.

scholarly journals Establishing the impact of powerful AGN on their host galaxies

2019 ◽  
Vol 15 (S359) ◽  
pp. 203-211
Author(s):  
C. M. Harrison ◽  
S. J. Molyneux ◽  
J. Scholtz ◽  
M. E. Jarvis
Keyword(s):  
Star Formation ◽  
Radio Emission ◽  
Emission Line ◽  
Spatial Scales ◽  
Gas Content ◽  
Host Galaxies ◽  
Integral Field Spectroscopy ◽  
Field Spectroscopy ◽  
The Impact ◽  
Integral Field

AbstractEstablishing the role of active galactic nuclei (AGN) during the formation of galaxies remains one of the greatest challenges of galaxy formation theory. Towards addressing this, we summarise our recent work investigating: (1) the physical drivers of ionised outflows and (2) observational signatures of the impact by jets/outflows on star formation and molecular gas content in AGN host galaxies. We confirm a connection between radio emission and extreme ionised gas kinematics in AGN hosts. Emission-line selected AGN are significantly more likely to exhibit ionised outflows (as traced by the [O iii] emission line) if the projected linear extent of the radio emission is confined within the spectroscopic aperture. Follow-up high resolution radio observations and integral field spectroscopy of 10 luminous Type 2 AGN reveal moderate power, young (or frustrated) jets interacting with the interstellar medium. We find that these sources live in highly star forming and gas rich galaxies. Additionally, by combining ALMA-derived dust maps with integral field spectroscopy for eight host galaxies of z ≈ 2 X-ray AGN, we show that Hα emission is an unreliable tracer of star formation. For the five targets with ionised outflows we find no dramatic in-situ shut down of the star formation. Across both of these studies we find that if these AGN do have a negative impact upon their host galaxies, it must be happening on small (unresolved) spatial scales and/or an observable galaxy-wide impact has yet to occur.

NGC7469 as seen by MEGARA at the GTC

2019 ◽  
Vol 15 (S356) ◽  
pp. 306-309
Author(s):  
Sara Cazzoli ◽  
Armando Gil de Paz ◽  
Isabel Márquez ◽  
Josefa Masegosa ◽  
Jorge Iglesias ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
Spatial Scales ◽  
Emission Lines ◽  
Integral Field Spectroscopy ◽  
Field Spectroscopy ◽  
Integral Field

AbstractWe present the main results from the analysis of the Hα-[NII] emission lines with integral field spectroscopy observations gathered with MEGARA at the GTC of the nearby Seyfert 1.5 galaxy NGC7469. We obtained maps of the ionised gas in the inner 12.5 arcsec × 11.3 arcsec, at spatial scales of 0.62 arcsec, with an unprecedented spectral resolution (R ˜ 20 000). We characterized the kinematics and ionisation mechanism of the distinct kinematic components (Cazzoli et al.2019).

scholarly journals The stellar structure of early-type galaxies: a wide-field Mitchell Spectrograph view

2016 ◽  
Vol 11 (S321) ◽  
pp. 288-288
Author(s):  
N. F. Boardman ◽  
A. Weijmans ◽  
R. C. E. van den Bosch ◽  
L. Zhu ◽  
A. Yildirim ◽  
...  
Keyword(s):  
Effective Radius ◽  
Stellar Structure ◽  
Wide Field ◽  
Early Type ◽  
Integral Field Spectroscopy ◽  
Field Spectroscopy ◽  
Integral Field ◽  
Made In

Much progress has been made in recent years towards understanding how early-type galaxies (ETGs) form and evolve. SAURON (Bacon et al. 2001) integral-field spectroscopy from the ATLAS3D survey (Cappellari et al. 2011) has suggested that less massive ETGs are linked directly to spirals, whereas the most massive objects appear to form from a series of merging and accretion events (Cappellari et al. 2013). However, the ATLAS3D data typically only extends to about one half-light radius (or effective radius, Re), making it unclear if this picture is truly complete.

Testing commercial variable fiber attenuators and lenslet arrays for equalized integral field spectroscopy applications

2008 ◽  
Author(s):  
F. Gracia-Temich ◽  
B. García-Lorenzo ◽  
Y. Padilla-Michel ◽  
J. F. M. Escobar-Romero ◽  
J. J. Fuensalida ◽  
...  
Keyword(s):  
Integral Field Spectroscopy ◽  
Field Spectroscopy ◽  
Integral Field
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