scholarly journals The Nature of Hickson Compact Group 18

2000 ◽  
Vol 174 ◽  
pp. 112-115
Author(s):  
Henri Plana ◽  
Claudia Mendes de Oliveira ◽  
Philippe Amram ◽  
Chantal Balkowski
Keyword(s):  
Star Formation ◽  
Velocity Field ◽  
Compact Group ◽  
Gas Distribution ◽  
Irregular Galaxy ◽  
Individual Group ◽  
Fabry Perot ◽  
Group Members

AbstractWe present new observations of Hα emission of the Hickson Compact Group 18 (HCG 18) obtained with a scanning Fabry-Perot interferometer. The velocity field does not show motions of individual group members but instead a complex common velocity field of H18b, c and d. The gas distribution is very clumpy with blobs coinciding with group members but located also elsewhere. Comparing Hα with H ɪ data we reached the conclusion that HCG 18 seems to be an irregular galaxy containing several clumps of star formation sites.

scholarly journals Tridimensional Observations of Nearby Active Galaxies Using OAO Spectronebulagraph

1995 ◽  
Vol 149 ◽  
pp. 207-208 ◽  
Author(s):  
M. Yoshida ◽  
Y. Shimizu ◽  
H. Koyano ◽  
G. Kosugi ◽  
K. Aoki ◽  
...  
Keyword(s):  
Star Formation ◽  
Velocity Field ◽  
Active Galaxies ◽  
H Ii Regions ◽  
Main Body ◽  
Irregular Galaxy ◽  
Low Velocity ◽  
Star Formation Activity ◽  
Intensity Map ◽  
Slit Scanning

We developed a slit-scanning type 3D-spectroscopic system named as Spectronebulagraph (hereafter SNG; Kosugi et al. 1994) at Okayama Astrophysical Observatory. A detailed description about SNG is presented by Ohtani et al. elsewhere in this colloquium. We present here the results of the 3D-spectroscopy of four nearby active galaxies by using SNG.This nearby (at distance of 5.4 Mpc) Magellanic irregular galaxy has many H II regions in its main body suggesting violent star-formation activity. We performed tridimensional observations of NGC 4449 using SNG in order to obtain detailed kinematic structure and then to investigate the star-formation mechanism of NGC 4449. Hα intensity map, Hα velocity field are shown in figure 1. As is obvious in lower panel of figure 1, no global rotational motion was detected. Most impressive feature of the velocity field is kpc-scale mosaic structure of low velocity and high velocity components. Also, many filamentary components were newly found in 3D-datacube of the SNG observation.

scholarly journals 3D Studies of Galaxies in Compact Groups

2014 ◽  
Vol 10 (S309) ◽  
pp. 175-177
Author(s):  
Claudia Mendes de Oliveira ◽  
Sergio Torres-Flores ◽  
Philippe Amram ◽  
Henri Plana ◽  
Benoit Epinat
Keyword(s):  
Star Formation ◽  
Energy Distribution ◽  
Compact Group ◽  
Spectral Energy Distribution ◽  
Interacting Galaxies ◽  
Spectral Energy ◽  
Compact Groups ◽  
Distribution Fitting ◽  
Fabry Perot ◽  
Fisher Relation

AbstractFabry-Perot data of compact group galaxies have been used to show that the Tully-Fisher relation in any photometric band, for galaxies with vmax > 100 km/s, is very similar to that for galaxies in other less dense environments. In the low-luminosity end, however, a few compact group galaxies fall above the relation apparently because they are too bright for their mass. Here we show that if the mass is properly computed from spectral energy distribution fitting or mass modelling, for the low-luminosity galaxies, their positions in the stellar-mass or baryonic Tully-Fisher relation are what is expected for a normal Tully-Fisher relation and the outlying positions observed in the B and K Tully-Fisher relation could be explained by brightening of the low-luminosity interacting galaxies due to strong star formation or AGN activity.

scholarly journals Gas and Stellar Kinematics in the Disk and Bar of Mrk 573

1996 ◽  
Vol 157 ◽  
pp. 218-220 ◽  
Author(s):  
V. L. Afanasiev ◽  
A. N. Burenkov ◽  
A. I. Shapovalova ◽  
V. V. Vlasyuk
Keyword(s):  
Velocity Field ◽  
Complex Structure ◽  
Seyfert Galaxy ◽  
Helical Structure ◽  
Emission Lines ◽  
Stellar Kinematics ◽  
Gas Distribution ◽  
Fabry Perot ◽  
The Galaxy ◽  
Galaxy Center

AbstractResults of 3D-spectroscopy for the nearby Seyfert galaxy Mrk 573 obtained at the 6-m telescope with the scanning Fabry-Perot interferometer and the Multi-Pupil Field Spectrograph (MPFS) are presented. Emission lines images of the galaxy center demonstrate a complex structure of ENLR, coinciding with the radio data. An analysis of the velocity field shows that some gas structures do not lie in the plane of the galaxy. An explanation of the observed velocity field and gas distribution by radiation of a helical structure located inside an ionization cone is proposed.

The codevelopment of group relationships: The role of individual group member’s and other group members’ mutual influence and shared group environment.

2019 ◽  
Vol 66 (5) ◽  
pp. 640-649 ◽  
Author(s):  
Gianluca Lo Coco ◽  
Salvatore Gullo ◽  
Gabriele Profita ◽  
Chiara Pazzagli ◽  
Claudia Mazzeschi ◽  
...  
Keyword(s):  
Mutual Influence ◽  
Individual Group ◽  
Group Environment ◽  
Group Members ◽  
Group Relationships

The Epistemology of Groups

2020 ◽  
Author(s):  
Jennifer Lackey
Keyword(s):  
Group Level ◽  
Social Significance ◽  
Individual Group ◽  
Key Concepts ◽  
Normative Requirements ◽  
Group Members ◽  
The Individual ◽  
Belief Justification ◽  
In Virtue Of ◽  
Trump Administration

Groups are often said to bear responsibility for their actions, many of which have enormous moral, legal, and social significance. The Trump Administration, for instance, is said to be responsible for the U.S.’s inept and deceptive handling of COVID-19 and the harms that American citizens have suffered as a result. But are groups subject to normative assessment simply in virtue of their individual members being so, or are they somehow agents in their own right? Answering this question depends on understanding key concepts in the epistemology of groups, as we cannot hold the Trump Administration responsible without first determining what it believed, knew, and said. Deflationary theorists hold that group phenomena can be understood entirely in terms of individual members and their states. Inflationary theorists maintain that group phenomena are importantly over and above, or otherwise distinct from, individual members and their states. It is argued that neither approach is satisfactory. Groups are more than their members, but not because they have “minds of their own,” as the inflationists hold. Instead, this book shows how group phenomena—like belief, justification, and knowledge—depend on what the individual group members do or are capable of doing while being subject to group-level normative requirements. This framework, it is argued, allows for the correct distribution of responsibility across groups and their individual members.

scholarly journals Ionization compression impact on dense gas distribution and star formation

2014 ◽  
Vol 564 ◽  
pp. A106 ◽  
Author(s):  
P. Tremblin ◽  
N. Schneider ◽  
V. Minier ◽  
P. Didelon ◽  
T. Hill ◽  
...  
Keyword(s):  
Star Formation ◽  
Dense Gas ◽  
Gas Distribution

scholarly journals The supergiant shell with triggered star formation in the dwarf irregular galaxy IC 2574: neutral and ionized gas kinematics

2014 ◽  
Vol 444 (1) ◽  
pp. 376-391 ◽  
Author(s):  
O. V. Egorov ◽  
T. A. Lozinskaya ◽  
A. V. Moiseev ◽  
G. V. Smirnov-Pinchukov
Keyword(s):  
Star Formation ◽  
Irregular Galaxy ◽  
Ionized Gas ◽  
Gas Kinematics

Discovery of Latent Star Formation in the Extended H i Gas around the Local Group Dwarf Irregular Galaxy NGC 6822

2003 ◽  
Vol 590 (1) ◽  
pp. L17-L20 ◽  
Author(s):  
Yutaka Komiyama ◽  
Sadanori Okamura ◽  
Masafumi Yagi ◽  
Hisanori Furusawa ◽  
Mamoru Doi ◽  
...  
Keyword(s):  
Star Formation ◽  
Local Group ◽  
Irregular Galaxy ◽  
Ngc 6822

scholarly journals Spinning Bar and a Star-formation Inefficient Repertoire: Turbulence in Hickson Compact Group NGC 7674

2020 ◽  
Vol 893 (1) ◽  
pp. 26 ◽  
Author(s):  
Diane M. Salim ◽  
Katherine Alatalo ◽  
Christoph Federrath ◽  
Brent Groves ◽  
Lisa J. Kewley
Keyword(s):  
Star Formation ◽  
Compact Group

scholarly journals Elaborating on Team-Member Disagreement: Examining Patterned Dispersion in Team-Level Constructs

2018 ◽  
Vol 44 (1) ◽  
pp. 165-210 ◽  
Author(s):  
Andrew C. Loignon ◽  
David J. Woehr ◽  
Misty L. Loughry ◽  
Matthew W. Ohland
Keyword(s):  
Team Member ◽  
Theoretical Frameworks ◽  
Individual Group ◽  
Team Members ◽  
Team Outcomes ◽  
Emergent States ◽  
Multilevel Theory ◽  
Group Members ◽  
The Mean ◽  
Mean Differences

Emergent states are team-level attributes that reflect team members’ collective attitudes, values, cognitions, and motivations and influence team effectiveness. When measuring emergent states (e.g., cohesion, conflict, satisfaction), researchers frequently collect ratings from individual group members and aggregate them to the team level. After aggregating to the team level, researchers typically focus on mean differences across teams and ignore variability within teams. Rather than focusing on the mean level of emergent states, this study draws on recent advances in multilevel theory and describes an approach for examining the specific patterns of dispersion (i.e., disagreement) across five emergent states. Our findings suggest that teams reliably demonstrate different patterns of rating dispersion that are consistent with existing theoretical frameworks and typologies of dispersion, yet have not previously been empirically demonstrated. We also present evidence that the different patterns of dispersion in emergent states are significantly related to key team outcomes, even after controlling for the mean levels of those emergent states. These findings underscore the importance of exploring additional forms of team-level constructs and highlight ways of extending our understanding of group-level phenomena.

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