scholarly journals Inner and outer star forming regions over the disks of spiral galaxies

2018 ◽  
Vol 609 ◽  
pp. A102 ◽  
Author(s):  
M. Rodríguez-Baras ◽  
A. I. Díaz ◽  
F. F. Rosales-Ortega ◽  
S. F. Sánchez
Keyword(s):  
Galaxy Formation ◽  
Spiral Galaxies ◽  
Complete Characterization ◽  
Star Forming ◽  
Star Forming Regions ◽  
Integral Field Spectroscopy ◽  
Formation And Evolution ◽  
Inside Out ◽  
Integral Field

Context. The knowledge of abundance distributions is central to understanding the formation and evolution of galaxies. Most of the relations employed for the derivation of gas abundances have so far been derived from observations of outer disk H ii regions, despite the known differences between inner and outer regions. Aims. Using integral field spectroscopy (IFS) observations we aim to perform a systematic study and comparison of two inner and outer H ii regions samples. The spatial resolution of the IFS, the number of objects and the homogeneity and coherence of the observations allow a complete characterization of the main observational properties and differences of the regions. Methods. We analyzed a sample of 725 inner H ii regions and a sample of 671 outer H ii regions, all of them detected and extracted from the observations of a sample of 263 nearby, isolated, spiral galaxies observed by the CALIFA survey. Results. We find that inner H ii regions show smaller equivalent widths, greater extinction and luminosities, along with greater values of [N ii] λ6583/Hα and [O ii] λ3727/[O iii] λ5007 emission-line ratios, indicating higher metallicities and lower ionization parameters. Inner regions have also redder colors and higher photometric and ionizing masses, although Mion/Mphot is slighty higher for the outer regions. Conclusions. This work shows important observational differences between inner and outer H ii regions in star forming galaxies not previously studied in detail. These differences indicate that inner regions have more evolved stellar populations and are in a later evolution state with respect to outer regions, which goes in line with the inside-out galaxy formation paradigm.

scholarly journals Inner and outer star forming regions over the discs of spiral galaxies I. Sample characterization

2016 ◽  
Vol 11 (S321) ◽  
pp. 296-296
Author(s):  
Marina Rodríguez-Baras ◽  
A.I. Díaz ◽  
F.F. Rosales-Ortega
Keyword(s):  
Star Formation ◽  
Disk Galaxies ◽  
Work Sample ◽  
Star Forming ◽  
Star Forming Regions ◽  
Integral Field Spectroscopy ◽  
The Galaxy ◽  
Sample Characterization ◽  
Integral Field

AbstractThis project is aimed at understanding the dependence of star formation on the environment by analysing young stellar populations in two very different positions in disk galaxies: circumnuclear and outer disk giant regions. Integral field spectroscopy (IFS) provide an ideal means to achieve these goals providing simultaneous spatial and spectral resolution. Here we present the characterization of the work sample, composed by 671 outer regions and 725 inner regions from 263 isolated spirals galaxies observed by the CALIFA survey. The wide number of regions in both samples allows us to obtain statistically relevant results about the influence of metallicity, density and environment on star formation, and how it disseminates over the galaxy, to obtain evolutionary stories for the star-forming regions and to compare our results with models of massive star formation and galactic chemical evolution.

Simulating star-forming regions in spiral galaxies with AMUSE

2019 ◽  
Vol 14 (S351) ◽  
pp. 216-219
Author(s):  
Steven Rieder ◽  
Clare Dobbs ◽  
Thomas Bending
Keyword(s):  
Gas Dynamics ◽  
Molecular Clouds ◽  
Spiral Galaxies ◽  
Initial Conditions ◽  
Cluster Formation ◽  
Star Cluster ◽  
Star Forming ◽  
Star Forming Regions ◽  
Formation And Evolution ◽  
Spiral Arm

AbstractWe present a model for hydrodynamic + N-body simulations of star cluster formation and evolution using AMUSE. Our model includes gas dynamics, star formation in regions of dense gas, stellar evolution and a galactic tidal spiral potential, thus incorporating most of the processes that play a role in the evolution of star clusters.We test our model on initial conditions of two colliding molecular clouds as well as a section of a spiral arm from a previous galaxy simulation.

scholarly journals Mahalo-Subaru: Mapping Star Formation at the Peak Epoch of Massive Galaxy Formation

2012 ◽  
Vol 8 (S295) ◽  
pp. 74-77 ◽  
Author(s):  
Tadayuki Kodama ◽  
Masao Hayashi ◽  
Yusei Koyama ◽  
Ken-ichi Tadaki ◽  
Ichi Tanaka ◽  
...  
Keyword(s):  
Star Formation ◽  
Galaxy Formation ◽  
Narrow Band ◽  
Narrow Band Imaging ◽  
Early Stage ◽  
Cluster Galaxies ◽  
Star Forming ◽  
Formation And Evolution ◽  
Cluster Cores ◽  
Inside Out

AbstractMAHALO-Subaru (MApping HAlpha and Lines of Oxygen with Subaru) is our on-going large programme which aims to investigate how the star forming activities in galaxies are propagated as a function of time, mass, and environment. We are targeting 10 clusters and proto-clusters at 0.4<z<2.6, and two general fields (GOODS-N and SXDF-CANDELS) with Suprime-Cam and MOIRCS by utilizing our unique sets of narrow-band filters. The narrow-band imaging can map out star forming galaxies with the redshifted Halpha and/or [OII] emission lines from our targets, and thus providing relatively unbiased views of star forming activities across time and environment. We have almost completed narrow-band imaging of our targets, and found that star forming activity is very high even in the proto-cluster cores (z≳1.5), and that the peak of star formation is shifted outwards with time, indicating the inside-out formation of clusters. Moreover, we have identified many “red” emitters especially in high density regions at z>2, which suggests that the mode of star formation and/or the activation of AGN are dependent on environment, and thus holding the key to the environmental effects at the early stage of cluster galaxies formation and evolution.

scholarly journals Mapping the Dynamics of the Quasar 3C 48

2001 ◽  
Vol 205 ◽  
pp. 162-165
Author(s):  
Eleni T. Chatzichristou
Keyword(s):  
Emission Line ◽  
Radio Source ◽  
Star Forming ◽  
Physical Conditions ◽  
Star Forming Regions ◽  
Integral Field Spectroscopy ◽  
Field Spectroscopy ◽  
Ir Emission ◽  
Integral Field ◽  
Extended Emission

The archetypical, nearby (z=0.37) quasar 3C 48 is an unusual CSS radio source with excess far-IR emission, whose one-sided radio jet is aligned with the extended ionized emission and a putative second nucleus. Because of its high AGN luminosity and proximity, 3C 48 is a good candidate to search for kinematic signatures of the radio jet-gas coupling and/or of a recent interaction. The radio morphology and our ground-based integral field spectroscopy suggest that the jet is interacting with its immediate environment. Using STIS aboard HST in several slit positions within the central 1”, we map the kinematics and physical conditions of the extended emission line gas and their relations to near-nuclear star forming regions found in existing HST images.

IRX–βRELATION OF STAR-FORMING REGIONS IN NGC 628 BASED ON INTEGRAL FIELD SPECTROSCOPY

2016 ◽  
Vol 826 (2) ◽  
pp. 209 ◽  
Author(s):  
Chengyun Ye ◽  
Hu Zou ◽  
Lin Lin ◽  
Jianhui Lian ◽  
Ning Hu ◽  
...  
Keyword(s):  
Star Forming ◽  
Star Forming Regions ◽  
Integral Field Spectroscopy ◽  
Field Spectroscopy ◽  
Integral Field

scholarly journals The Integral Field View of the Orion Nebula

2014 ◽  
Vol 2014 ◽  
pp. 1-14
Author(s):  
Adal Mesa-Delgado
Keyword(s):  
Large Scale ◽  
3D Structure ◽  
Active Role ◽  
Small Scale ◽  
H Ii Regions ◽  
Orion Nebula ◽  
Star Forming ◽  
Star Forming Regions ◽  
Integral Field Spectroscopy ◽  
Integral Field

This paper reviews the major advances achieved in the Orion Nebula through the use of integral field spectroscopy (IFS). Since the early work of Vasconcelos and collaborators in 2005, this technique has facilitated the investigation of global properties of the nebula and its morphology, providing new clues to better constrain its 3D structure. IFS has led to the discovery of shock-heated zones at the leading working surfaces of prominent Herbig-Haro objects as well as the first attempt to determine the chemical composition of Orion protoplanetary disks, also known asproplyds. The analysis of these morphologies using IFS has given us new insights into the abundance discrepancy problem, a long-standing and unresolved issue that casts doubt on the reliability of current methods used for the determination of metallicities in the universe from the analysis of H II regions. Results imply that high-density clumps and high-velocity flows may play an active role in the production of such discrepancies. Future investigations based on the large-scale IFS mosaic of Orion will be very valuable for exploring how the integrated effect of small-scale structures may have impact at larger scales in the framework of star-forming regions.

scholarly journals Integral field spectroscopy of local LCBGs: NGC 7673, a case study. Physical properties of star-forming regions

2010 ◽  
Vol 411 (3) ◽  
pp. 1819-1832 ◽  
Author(s):  
A. Castillo-Morales ◽  
J. Gallego ◽  
J. Pérez-Gallego ◽  
R. Guzmán ◽  
J. C. Muñoz-Mateos ◽  
...  
Keyword(s):  
Physical Properties ◽  
Star Forming ◽  
Star Forming Regions ◽  
Integral Field Spectroscopy ◽  
Field Spectroscopy ◽  
Integral Field

Multiwavelength analysis of OH Megamaser galaxies: The case of IRAS11506-3851

2020 ◽  
Vol 15 (S359) ◽  
pp. 347-349
Author(s):  
Carpes P. Hekatelyne ◽  
Thaisa Storchi-Bergmann
Keyword(s):  
Active Galactic Nuclei ◽  
Hubble Space Telescope ◽  
Galactic Nuclei ◽  
Large Array ◽  
Very Large Array ◽  
Star Forming ◽  
Star Forming Regions ◽  
Field Unit ◽  
Mixed Transition ◽  
Integral Field

AbstractWe present Multi-Object Spectrograph (GMOS) Integral Field Unit (IFU), Hubble Space Telescope (HST) and Very Large Array (VLA) observations of the inner kpc of the OH Megamaser galaxy IRAS 11506-3851. In this work we discuss the kinematics and excitation of the gas as well as its radio emission. The HST images reveal an isolated spiral galaxy and the combination with the GMOS-IFU flux distributions allowed us to identify a partial ring of star-forming regions surrounding the nucleus with a radius of ≍500 pc. The emission-line ratios and excitation map reveal that the region inside the ring present mixed/transition excitation between those of Starbursts and Active Galactic Nuclei (AGN), while regions along the ring are excited by Starbursts. We suggest that we are probing a buried or fading AGN that could be both exciting the gas and originating an outflow.

scholarly journals Kinematics of the outskirts of S0 galaxies from PNe and GCs

2016 ◽  
Vol 11 (S321) ◽  
pp. 290-290
Author(s):  
A. Cortesi ◽  
C. Mendes de Oliveira
Keyword(s):  
Galaxy Formation ◽  
Globular Clusters ◽  
Velocity Dispersion ◽  
Spiral Galaxies ◽  
Formation Mechanisms ◽  
Stellar Kinematics ◽  
Lenticular Galaxies ◽  
Star Forming ◽  
Flat Rotation Curves ◽  
S0 Galaxies

AbstractThe stellar kinematics of the discs of S0 galaxies (as obtained using planetary nebulae, PNe, and integrated stellar light data) is comparable to that of spiral galaxies, with similar flat rotation curves and falling velocity dispersion profiles, but they present a larger amount of random motions. The only other tracer available to probe the kinematics of individual early-type galaxies are globular clusters (GCs). GCs’ formation is intimately connected to a galaxy major star forming event(s) and GCs are, therefore, good proofs of galaxy formation histories. We directly compare a sample of PNe, GCs, and stellar velocities out to 4 effective radii, in the S0 galaxies NGC 2768 and NGC 1023. In particular, we test a new method for studying GC properties and we find that these two lenticular galaxies are consistent with being formed through different formation mechanisms.

scholarly journals The potential of using KMOS for multi-object massive star spectroscopy

2016 ◽  
Vol 12 (S329) ◽  
pp. 454-454
Author(s):  
Michael Wegner ◽  
Ralf Bender ◽  
Ray Sharples ◽  
Keyword(s):  
Galaxy Formation ◽  
Near Infrared ◽  
High Redshift ◽  
High Mass ◽  
Galactic Centre ◽  
Star Forming ◽  
Star Forming Regions ◽  
Spectral Bands ◽  
Galaxy Formation And Evolution ◽  
Potential Applications

AbstractKMOS, the “K-Band Multi-Object Spectrometer”, was built by a British-German consortium as a second generation instrument for the ESO Paranal Observatory. It is available to the user community since its successful commissioning in 2013 (Sharples et al. 2013). As a multi-object integral field spectrometer for the near infrared, KMOS offers 24 deployable IFUs of 2.8x2.8 arcsec and 14x14 spatial pixels each, which can either be placed individually within a 7.2 arcmin field of view or combined in a Mosaic mode in order to map contiguous fields on sky. The instrument covers the whole range of NIR atmospheric windows (0.8. . .2.5μm) with 5 spectral bands and a resolution of R ≈ 3000. . .4000.Although the main science driver for KMOS was to enable the study of galaxy formation and evolution through multiplexed observations of high-redshift galaxies, KMOS also already exhibited its tremendous potential for the spectroscopy of massive stars: A quantitative study of 27 RSGs in NGC 300 (Gazak et al. 2015) proves its applicability for the spectroscopy of individual stars even beyond the Local Group. A Mosaic observation of the Galactic centre (Feldmeier-Krause et al. 2015) demonstrates how spectra of early-type stars can be extracted from a contiguous field. Other applications include (but need not be limited to) velocity determinations of globular cluster stars, observations of jets/outflows of high mass protostars, or contiguous mapping of star-forming regions.We therefore aim at presenting the excellent capabilities of KMOS to a wider community and indicate potential applications.

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