scholarly journals An inventory of supershells in nearby galaxies: first results from THINGS

2006 ◽  
Vol 2 (S237) ◽  
pp. 393-393
Author(s):  
Ioannis Bagetakos ◽  
Elias Brinks ◽  
Fabian Walter ◽  
Erwin de Blok
Keyword(s):  
Angular Resolution ◽  
Star Formation Rate ◽  
Formation Rate ◽  
Nearby Galaxy ◽  
Linear Resolution ◽  
Ngc 6946 ◽  
First Results ◽  
Nearby Galaxies ◽  
Line Survey ◽  
Hi Shells

AbstractThe HI Nearby Galaxy Survey (THINGS), is a 21–cm HI line survey of a sample of 34 nearby (3–10 Mpc) galaxies (Walter et al. 2005). The observations were carried out with the VLA and have a velocity resolution of 5 km s−1 or better and an angular resolution of 7″ which at this distance range corresponds to a linear resolution of 100–300 pc. One of the primary goals of THINGS is to look at the fine–scale structure of the Interstellar Medium (ISM) and examine how it varies as a function of Hubble type, star formation rate, galaxy mass, metallicity, etc. We present one of the first science results from this project, an inventory of HI shells in the galaxies NGC 628, NGC 3184, and NGC 6946.

scholarly journals Interactions and star formation

2015 ◽  
Vol 11 (S315) ◽  
pp. 236-239
Author(s):  
Johan H. Knapen ◽  
Mauricio Cisternas ◽  
Miguel Querejeta
Keyword(s):  
Star Formation ◽  
Massive Star ◽  
Star Formation Rate ◽  
Formation Rate ◽  
Morphological Type ◽  
Stellar Mass ◽  
Interacting Galaxies ◽  
The Galaxy ◽  
Nearby Galaxies ◽  
Ir Emission

AbstractWe investigate the influence of interactions on the star formation by studying a sample of almost 1500 of the nearest galaxies, all within a distance of ~45 Mpc. We define the massive star formation rate (SFR), as measured from far-IR emission, and the specific star formation rate (SSFR), which is the former quantity normalized by the stellar mass of the galaxy, and explore their distribution with morphological type and with stellar mass. We then calculate the relative enhancement of these quantities for each galaxy by normalizing them by the median SFR and SSFR values of individual control populations of similar non-interacting galaxies. We find that both SFR and SSFR are enhanced in interacting galaxies, and more so as the degree of interaction is higher. The increase is, however, moderate, reaching a maximum of a factor of 1.9 for the highest degree of interaction (mergers). The SFR and SSFR are enhanced statistically in the population, but in most individual interacting galaxies they are not enhanced at all. We discuss how those galaxies with the largest SFR and/or SSFR enhancement can be defined as starbursts. We argue that this study, based on a representative sample of nearby galaxies, should be used to place constraints on studies based on samples of galaxies at larger distances.

scholarly journals CALIBRATING EXTINCTION-FREE STAR FORMATION RATE DIAGNOSTICS WITH 33 GHz FREE-FREE EMISSION IN NGC 6946

2011 ◽  
Vol 737 (2) ◽  
pp. 67 ◽  
Author(s):  
E. J. Murphy ◽  
J. J. Condon ◽  
E. Schinnerer ◽  
R. C. Kennicutt ◽  
D. Calzetti ◽  
...  
Keyword(s):  
Star Formation ◽  
Star Formation Rate ◽  
Formation Rate ◽  
Ngc 6946

scholarly journals J-PAS : Low-resolution (R ∼ 50) spectroscopy covering 8000 deg2

2014 ◽  
Vol 10 (S309) ◽  
pp. 29-30
Author(s):  
C. López-Sanjuan ◽  
A. J. Cenarro ◽  
L. A. Díaz-García ◽  
D. J. Muniesa ◽  
I. San Roman ◽  
...  
Keyword(s):  
Star Formation Rate ◽  
Formation Rate ◽  
Elliptical Galaxies ◽  
3D Analysis ◽  
Low Resolution ◽  
Local Universe ◽  
Photometric Redshifts ◽  
Data Set ◽  
Nearby Galaxies ◽  
The Impact

AbstractWe present the ambitious project J-PAS, that will cover 8000 deg2 of the northern sky with 54 narrow-band (∼145Å) contiguous filters, all of them in the optical range (3700Å-9200Å). J-PAS will provide a low resolution spectra (R ∼ 50) in every pixel of the northern sky by 2020, leading to excellent photometric redshifts (0.3% uncertainty) of 100 million sources. J-PAS will permit the study of the 2D properties of nearby galaxies with unprecedented statistics. Some viable studies are the distribution of the star formation rate traced by Hα, the stellar populations gradients in elliptical galaxies up to a few effective radii, or the impact of environment in galaxy properties. In summary, J-PAS will bring a superb data set for 3D analysis in the local Universe.

scholarly journals AKARI/IRC broadband mid-infrared data as an indicator of the Star Formation Rate

2011 ◽  
Vol 7 (S284) ◽  
pp. 357-359
Author(s):  
Fang-Ting Yuan ◽  
Tsutomu T. Takeuchi ◽  
Véronique Buat ◽  
Sébastien Heinis ◽  
Elodie Giovannoli ◽  
...  
Keyword(s):  
Star Formation ◽  
Star Formation Rate ◽  
Formation Rate ◽  
Infrared Camera ◽  
Far Infrared ◽  
Mid Infrared ◽  
Extended Sources ◽  
Nearby Galaxies ◽  
First Time ◽  
Infrared Data

AbstractWith the goal of constructing Star-Formation Rates (SFR) from AKARI Infrared Camera (IRC) data, we analyzed an IR-selected GALEX-SDSS-2MASS-AKARI(IRC & Far-Infrared Surveyor) sample of 153 nearby galaxies. The far-infrared fluxes were obtained from AKARI diffuse maps to correct the underestimation for extended sources raised by PSF photometry. SFRs of these galaxies were derived using the SED fitting program CIGALE. In spite of complicated features contained in these bands, both the S9W and L18W emissions correlate with the SFR of galaxies. The SFR calibrations using S9W and L18W are presented for the first time. These calibrations agree well with previous work based on Spitzer data within the scatter, and should be applicable to dust-rich galaxies.

scholarly journals The effect of diffuse background on the spatially-resolved Schmidt relation in nearby spiral galaxies

2020 ◽  
Vol 634 ◽  
pp. A24 ◽  
Author(s):  
Nimisha Kumari ◽  
Mike J. Irwin ◽  
Bethan L. James
Keyword(s):  
Star Formation ◽  
Galaxy Formation ◽  
Spiral Galaxies ◽  
Formation Rate ◽  
Molecular Gas ◽  
Nearby Galaxy ◽  
Spatially Resolved ◽  
Diffuse Background ◽  
Nearby Galaxies ◽  
Atomic Gas

Context. The global Schmidt law of star formation provides a power-law relation between the surface densities of star-formation rate (SFR) and gas, and successfully explains plausible scenarios of galaxy formation and evolution. However, star formation being a multi-scale process, requires spatially-resolved analysis for a better understanding of the physics of star formation. Aims. It has been shown that the removal of a diffuse background from SFR tracers, such as Hα, far-ultraviolet (FUV), infrared, leads to an increase in the slope of the sub-galactic Schmidt relation. We reinvestigate the local Schmidt relations in nine nearby spiral galaxies taking into account the effect of inclusion and removal of diffuse background in SFR tracers as well as in the atomic gas. Methods. We used multiwavelength data obtained as part of the Spitzer Infrared Nearby Galaxies Survey, Key Insights on Nearby Galaxies: a Far-Infrared Survey with Herschel, The H I Nearby Galaxy Survey, and HERA CO-Line Extragalactic Survey. Making use of a novel split of the overall light distribution as a function of spatial scale, we subtracted the diffuse background in the SFR tracers as well as the atomic gas. Using aperture photometry, we study the Schmidt relations on background subtracted and unsubtracted data at physical scales varying between 0.5–2 kpc. Results. The fraction of diffuse background varies from galaxy to galaxy and accounts to ∼34% in Hα, ∼43% in FUV, ∼37% in 24 μm, and ∼75% in H I on average. We find that the inclusion of diffuse background in SFR tracers leads to a linear molecular gas Schmidt relation and a bimodal total gas Schmidt relation. However, the removal of diffuse background in SFR tracers leads to a super-linear molecular gas Schmidt relation. A further removal of the diffuse background from atomic gas results in a slope ∼1.4 ± 0.1, which agrees with dynamical models of star formation accounting for flaring effects in the outer regions of galaxies.

scholarly journals Chemical Evolution in Hierarchical Clustering Scenarios

2004 ◽  
Vol 217 ◽  
pp. 258-263
Author(s):  
Patricia B. Tissera ◽  
Cecilia Scannapieco
Keyword(s):  
Star Formation ◽  
Energy Distribution ◽  
Chemical Evolution ◽  
Star Formation Rate ◽  
Spectral Synthesis ◽  
Formation Rate ◽  
First Results ◽  
History Of ◽  
Chemical History ◽  
The Impact

We present first results of an implementation of chemical evolution in a cosmological hydrodynamical code, focusing the analysis on the effects of cooling baryons according to their metallicity. We found that simulations with primordial cooling can underestimate the star formation rate from z < 3 and by up to ≈ 20%. We constructed simulated spectra by combining the star formation and chemical history of galactic systems with spectral synthesis models and assess the impact of chemical evolution on the energy distribution.

scholarly journals SFR bulge-to-disk ratios from the CALIFA IFS nearby galaxies survey

2015 ◽  
Vol 11 (S315) ◽  
Author(s):  
C. Catalán-Torrecilla ◽  
A. Gil de Paz ◽  
A. Castillo-Morales ◽  
J. Méndez-Abreu ◽  
J. Iglesias-Páramo ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Star Formation ◽  
Representative Sample ◽  
Star Formation Rate ◽  
Narrow Band ◽  
Narrow Band Imaging ◽  
Formation Rate ◽  
Decomposition Approach ◽  
One Step ◽  
Nearby Galaxies

AbstractOur aim is to study the Star Formation Rate (SFR) by galaxy components such as bulges, bars and disks in a representative sample of nearby galaxies. A 2-dimensional (2D) photometric decomposition approach (GASP2D) is used to obtain these components. The availability of IFS data for the CALIFA galaxies makes possible to go one step further as we can apply the previous decompositions over 3D datacubes to disentangle the spatial distribution of the SFR over different components free from the limitations associated to narrow-band imaging.

scholarly journals The VMC survey – XIV. First results on the look-back time star formation rate tomography of the Small Magellanic Cloud★

2015 ◽  
Vol 449 (1) ◽  
pp. 639-661 ◽  
Author(s):  
Stefano Rubele ◽  
Léo Girardi ◽  
Leandro Kerber ◽  
Maria-Rosa L. Cioni ◽  
Andrés E. Piatti ◽  
...  
Keyword(s):  
Star Formation ◽  
Star Formation Rate ◽  
Formation Rate ◽  
Magellanic Cloud ◽  
Small Magellanic Cloud ◽  
Look Back ◽  
First Results ◽  
The Look

scholarly journals The First Systematic Multi-wavelength Survey of Extragalactic Supernova Remnants

2013 ◽  
Vol 9 (S296) ◽  
pp. 222-225
Author(s):  
I. Leonidaki ◽  
P. Boumis ◽  
A. Zezas
Keyword(s):  
Supernova Remnants ◽  
Star Formation Rate ◽  
Narrow Band ◽  
Formation Rate ◽  
Host Galaxies ◽  
X Ray ◽  
Different Types ◽  
Multi Wavelength ◽  
Nearby Galaxies ◽  
Optically Detected

AbstractWe present the largest sample of multi-wavelength Supernova Remnants (SNRs) in six nearby galaxies, based on Chandra archival data and deep optical narrow-band Hα and [Sii] images as well as spectroscopic observations. We have identified 37 X-ray selected thermal SNRs, 30 of which are new identifications and ~ 400 optical SNRs, for 67 of which we spectroscopically verified their shock-excited nature. We discuss the properties of the X-ray/optically detected SNRs in different types of galaxies and hence different environments, in order to address their dependence on their Interstellar Medium (ISM). We also discuss the SNR populations in the context of the star formation rate of their host galaxies. We cross-correlate parameters of the optically detected SNRs with parameters of coincident X-ray emitting SNRs in order to understand their evolution and investigate possible selection effects.

scholarly journals sígame v3: Gas Fragmentation in Postprocessing of Cosmological Simulations for More Accurate Infrared Line Emission Modeling

2021 ◽  
Vol 922 (1) ◽  
pp. 88
Author(s):  
Karen Pardos Olsen ◽  
Blakesley Burkhart ◽  
Mordecai-Mark Mac Low ◽  
Robin G. Treß ◽  
Thomas R. Greve ◽  
...  
Keyword(s):  
Radiative Transfer ◽  
Probability Distribution Function ◽  
Star Formation Rate ◽  
Formation Rate ◽  
Sample Selection ◽  
Line Emission ◽  
Far Infrared ◽  
Emission Lines ◽  
Nearby Galaxies ◽  
A New Technique

Abstract We present an update to the framework called Simulator of Galaxy Millimeter/submillimeter Emission (sígame). sígame derives line emission in the far-infrared (FIR) for galaxies in particle-based cosmological hydrodynamics simulations by applying radiative transfer and physics recipes via a postprocessing step after completion of the simulation. In this version, a new technique is developed to model higher gas densities by parameterizing the probability distribution function (PDF) of the gas density in higher-resolution simulations run with the pseudo-Lagrangian, Voronoi mesh code arepo. The parameterized PDFs are used as a look-up table, and reach higher densities than in previous work. sígame v3 is tested on redshift z = 0 galaxies drawn from the simba cosmological simulation for eight FIR emission lines tracing vastly different phases of the interstellar medium. This version of sígame includes dust radiative transfer with Skirt and high-resolution photoionization models with Cloudy, the latter sampled according to the density PDF of the arepo simulations to augment the densities in the cosmological simulation. The quartile distributions of the predicted line luminosities overlap with the observed range for nearby galaxies of similar star formation rate (SFR) for all but two emission lines: [O i]63 and CO(3–2), which are overestimated by median factors of 1.3 and 1.0 dex, respectively, compared to the observed line–SFR relation of mixed-type galaxies. We attribute the remaining disagreement with observations to the lack of precise attenuation of the interstellar light on sub-grid scales (≲200 pc) and differences in sample selection.

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