scholarly journals A three-dimensional map of the Milky Way using classical Cepheid variable stars

Science ◽  
2019 ◽  
Vol 365 (6452) ◽  
pp. 478-482 ◽  
Author(s):  
Dorota M. Skowron ◽  
Jan Skowron ◽  
Przemek Mróz ◽  
Andrzej Udalski ◽  
Paweł Pietrukowicz ◽  
...  
Keyword(s):  
Star Formation ◽  
Simple Model ◽  
Spiral Galaxy ◽  
Stellar Population ◽  
Milky Way ◽  
Three Dimensional ◽  
Variable Stars ◽  
Three Dimensions ◽  
Classical Cepheid ◽  
Barred Spiral Galaxy

The Milky Way is a barred spiral galaxy, with physical properties inferred from various tracers informed by the extrapolation of structures seen in other galaxies. However, the distances of these tracers are measured indirectly and are model-dependent. We constructed a map of the Milky Way in three dimensions, based on the positions and distances of thousands of classical Cepheid variable stars. This map shows the structure of our Galaxy’s young stellar population and allows us to constrain the warped shape of the Milky Way’s disk. A simple model of star formation in the spiral arms reproduces the observed distribution of Cepheids.

scholarly journals Substructure in Dwarf Galaxies

2004 ◽  
Vol 21 (4) ◽  
pp. 379-381
Author(s):  
Matthew Coleman
Keyword(s):  
Dark Matter ◽  
Star Formation ◽  
Large Scale ◽  
Stellar Population ◽  
Milky Way ◽  
Dwarf Galaxies ◽  
Tidal Interaction ◽  
Kinematic Evolution ◽  
Dark Material ◽  
Star Formation Histories

AbstractRecent years have seen a series of large-scale photometric surveys with the aim of detecting substructure in nearby dwarf galaxies. Some of these objects display a varying distribution of each stellar population, reflecting their star formation histories. Also, dwarf galaxies are dominated by dark matter, therefore luminous substructure may represent a perturbation in the underlying dark material. Substructure can also be the effect of tidal interaction, such as the disruption of the Sagittarius dSph by the Milky Way. Therefore, substructure in dwarf galaxies manifests the stellar, structural, and kinematic evolution of these objects.

scholarly journals GMC evolution in a barred spiral galaxy with star formation and thermal feedback

2016 ◽  
Vol 461 (2) ◽  
pp. 1684-1700 ◽  
Author(s):  
Yusuke Fujimoto ◽  
Greg L. Bryan ◽  
Elizabeth J. Tasker ◽  
Asao Habe ◽  
Christine M. Simpson
Keyword(s):  
Star Formation ◽  
Spiral Galaxy ◽  
Thermal Feedback ◽  
Barred Spiral Galaxy

scholarly journals The Massive stellar Population at the Galactic Center

2016 ◽  
Vol 12 (S329) ◽  
pp. 287-291
Author(s):  
Francisco Najarro ◽  
Diego de la Fuente ◽  
Tom R. Geballe ◽  
Don F. Figer ◽  
D. John Hillier
Keyword(s):  
Star Formation ◽  
Massive Star ◽  
Stellar Population ◽  
Milky Way ◽  
Local Group ◽  
Galactic Center ◽  
Spectroscopic Studies ◽  
Star Formation History ◽  
Stellar Content ◽  
Formation History

AbstractWe present results from our ongoing infrared spectroscopic studies of the massive stellar content at the Center of the Milky Way. This region hosts a large number of apparently isolated massive stars as well as three of the most massive resolved young clusters in the Local Group. Our survey seeks to infer the presence of a possible top-heavy recent star formation history and to test massive star formation channels: clusters vs isolation.

scholarly journals Towards a multi-scale understanding of the gas-star formation cycle in the Central Molecular Zone

2016 ◽  
Vol 11 (S322) ◽  
pp. 64-74
Author(s):  
J. M. Diederik Kruijssen
Keyword(s):  
Star Formation ◽  
Milky Way ◽  
High Redshift ◽  
Three Dimensional ◽  
Orbital Dynamics ◽  
Molecular Gas ◽  
Stellar Clusters ◽  
High Redshift Galaxies ◽  
Multi Scale ◽  
The Galaxy

AbstractThe Central Molecular Zone (CMZ, the central 500 pc of the Milky Way) contains the largest reservoir of high-density molecular gas in the Galaxy, but forms stars at a rate 10–100 times below commonly-used star formation relations. We discuss recent efforts in understanding how the nearest galactic nucleus forms its stars. The latest models of the gas inflow, star formation, and feedback duty cycle reproduce the main observable features of the CMZ, showing that star formation is episodic and that the CMZ currently resides at a star formation minimum. Using orbital modelling, we derive the three-dimensional geometry of the CMZ and show how the orbital dynamics and the star formation potential of the gas are closely coupled. We discuss how this coupling reveals the physics of star formation and feedback under the conditions seen in high-redshift galaxies, and promotes the formation of the densest stellar clusters in the Galaxy.

scholarly journals SDSS-IV MaNGA: Enhanced star formation in galactic-scale outflows

2021 ◽  
Author(s):  
Min Bao ◽  
Yanmei Chen ◽  
Qirong Yuan ◽  
Yong Shi ◽  
Dmitry Bizyaev ◽  
...  
Keyword(s):  
Star Formation ◽  
Stellar Population ◽  
Galactic Center ◽  
Formation Rate ◽  
Three Dimensional ◽  
Control Sample ◽  
Mass Star ◽  
Host Galaxies ◽  
Dimensional Parameter ◽  
Field Unit

Abstract Using the integral field unit (IFU) data from Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey, we collect a sample of 36 star forming galaxies that host galactic-scale outflows in ionized gas phase. The control sample is matched in the three dimensional parameter space of stellar mass, star formation rate and inclination angle. Concerning the global properties, the outflows host galaxies tend to have smaller size, more asymmetric gas disk, more active star formation in the center and older stellar population than the control galaxies. Comparing the stellar population properties along axes, we conclude that the star formation in the outflows host galaxies can be divided into two branches. One branch evolves following the inside-out formation scenario. The other locating in the galactic center is triggered by gas accretion or galaxy interaction, and further drives the galactic-scale outflows. Besides, the enhanced star formation and metallicity along minor axis of outflows host galaxies uncover the positive feedback and metal entrainment in the galactic-scale outflows. Observational data in different phases with higher spatial resolution are needed to reveal the influence of galactic-scale outflows on the star formation progress in detail.

scholarly journals Three classical Cepheid variable stars in the nuclear bulge of the Milky Way

Nature ◽  
2011 ◽  
Vol 477 (7363) ◽  
pp. 188-190 ◽  
Author(s):  
Noriyuki Matsunaga ◽  
Takahiro Kawadu ◽  
Shogo Nishiyama ◽  
Takahiro Nagayama ◽  
Naoto Kobayashi ◽  
...  
Keyword(s):  
Milky Way ◽  
Variable Stars ◽  
Classical Cepheid

scholarly journals Insights on bar quenching from a multiwavelength analysis: The case of Messier 95

2019 ◽  
Vol 621 ◽  
pp. L4 ◽  
Author(s):  
K. George ◽  
P. Joseph ◽  
C. Mondal ◽  
S. Subramanian ◽  
A. Subramaniam ◽  
...  
Keyword(s):  
Star Formation ◽  
Molecular Hydrogen ◽  
Stellar Population ◽  
Major Axis ◽  
Nuclear Region ◽  
Imaging Data ◽  
Physical Processes ◽  
Star Forming ◽  
The Galaxy ◽  
Barred Spiral Galaxy

The physical processes related to the effect of bars in the quenching of star formation in the region between the nuclear/central sub-kiloparsec region and the ends of the bar (bar region) of spiral galaxies is not fully understood. It is hypothesized that the bar can either stabilize the gas against collapse, inhibiting star formation, or efficiently consume all the available gas, leaving no fuel for further star formation. We present a multiwavelength study using the archival data of an early-type barred spiral galaxy, Messier 95, which shows signatures of suppressed star formation in the bar region. Using optical, ultraviolet (UV), infrared, CO, and HI imaging data we study the pattern of star formation progression and stellar/gas distribution, and try to provide insights into the process responsible for the observed pattern. The FUV–NUV pixel colour map reveals a cavity devoid of UV flux in the bar region that matches the length of the bar, which is ∼4.2 kpc. The central nuclear region of the galaxy shows a blue colour clump and along the major axis of the stellar bar the colour progressively becomes redder. Based on a comparison to single stellar population models, we show that the region of galaxy along the major axis of the bar, unlike the region outside the bar, is comprised of stellar populations with ages ≥350 Myr; there is a star-forming clump in the centre of younger ages of ∼150 Myr. Interestingly the bar region is also devoid of neutral and molecular hydrogen but has an abundant molecular hydrogen present at the nuclear region of the galaxy. Our results are consistent with a picture in which the stellar bar in Messier 95 is redistributing the gas by funnelling gas inflows to nuclear region, thus making the bar region devoid of fuel for star formation.

scholarly journals ASTE CO (3–2) Observations of the Barred Spiral Galaxy M 83: I. Correlation between CO (3–2)/CO (1–0) Ratios and Star Formation Efficiencies

2007 ◽  
Vol 59 (1) ◽  
pp. 43-54 ◽  
Author(s):  
Kazuyuki Muraoka ◽  
Kotaro Kohno ◽  
Tomoka Tosaki ◽  
Nario Kuno ◽  
Kouichiro Nakanishi ◽  
...  
Keyword(s):  
Star Formation ◽  
Spiral Galaxy ◽  
Barred Spiral Galaxy
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