scholarly journals Evolution of dwarf galaxy properties in local group environments

2016 ◽  
Author(s):  
Kenza Sigrid Arraki ◽  
Keyword(s):  
Local Group ◽  
Dwarf Galaxy ◽  
Group Environments

The Stellar Content of the Local Group Dwarf Galaxy Phoenix

1999 ◽  
Vol 118 (2) ◽  
pp. 862-882 ◽  
Author(s):  
D. Martínez-Delgado ◽  
C. Gallart ◽  
A. Aparicio
Keyword(s):  
Local Group ◽  
Dwarf Galaxy ◽  
Stellar Content

The Star Formation History of the Local Group Dwarf Galaxy Leo I

1999 ◽  
Vol 118 (5) ◽  
pp. 2245-2261 ◽  
Author(s):  
Carme Gallart ◽  
Wendy L. Freedman ◽  
Antonio Aparicio ◽  
Giampaolo Bertelli ◽  
Cesare Chiosi
Keyword(s):  
Star Formation ◽  
Local Group ◽  
Dwarf Galaxy ◽  
Star Formation History ◽  
Formation History ◽  
History Of

scholarly journals Wolf-Rayet stars at 1 - 2 Mpc

2003 ◽  
Vol 212 ◽  
pp. 547-548 ◽  
Author(s):  
Paul A. Crowther ◽  
Jay B. Abbott ◽  
Laurent Drissen ◽  
Hansrüdi Schild ◽  
Werner Schmutz ◽  
...  
Keyword(s):  
Optical Spectroscopy ◽  
Spiral Galaxy ◽  
Local Group ◽  
Narrow Band ◽  
Dwarf Galaxy ◽  
Narrow Band Imaging ◽  
Ic 10

We present new narrow-band imaging and optical spectroscopy of Wolf-Rayet stars in the Local Group dwarf galaxy IC 10 (Gemini-N- gmos) and Sculptor group spiral galaxy NGC 300 (VLT fors2).

scholarly journals On the early evolution of Local Group dwarf galaxy types: star formation and supernova feedback

2018 ◽  
Vol 479 (2) ◽  
pp. 1514-1527 ◽  
Author(s):  
José R Bermejo-Climent ◽  
Giuseppina Battaglia ◽  
Carme Gallart ◽  
Arianna Di Cintio ◽  
Chris B Brook ◽  
...  
Keyword(s):  
Star Formation ◽  
Local Group ◽  
Dwarf Galaxy ◽  
Early Evolution ◽  
Supernova Feedback

scholarly journals Distance to the nearby dwarf galaxy [TT2009] 25 in the NGC 891 group using the tip of the red giant branch

2019 ◽  
Vol 629 ◽  
pp. L2 ◽  
Author(s):  
Oliver Müller ◽  
Rodrigo Ibata ◽  
Marina Rejkuba ◽  
Lorenzo Posti
Keyword(s):  
Milky Way ◽  
Local Group ◽  
Dwarf Galaxies ◽  
Dwarf Galaxy ◽  
Small Scale ◽  
Accurate Information ◽  
Standard Candle ◽  
Stellar Halo ◽  
Red Giant ◽  
Small Field Of View

Dwarf galaxies are key objects for small-scale cosmological tests like the abundance problems or the planes-of-satellites problem. A crucial task is therefore to get accurate information for as many nearby dwarf galaxies as possible. Using extremely deep, ground-based V and i-band Subaru Suprime Cam photometry with a completeness of i = 27 mag, we measure the distance of the dwarf galaxy [TT2009] 25 using the tip of the red giant branch as a standard candle. This dwarf resides in the field around the Milky Way-analog NGC 891. Using a Bayesian approach, we measure a distance of 10.28−1.73+1.17 Mpc, which is consistent with the distance of NGC 891, and thus confirm it as a member of NGC 891. The dwarf galaxy follows the scaling relations defined by the Local Group dwarfs. We do not find an extended stellar halo around [TT2009] 25. In the small field of view of 100 kpc covered by the survey, only one bright dwarf galaxy and the giant stream are apparent. This is comparable to the Milky Way, where one bright dwarf resides in the same volume, as well as the Sagittarius stream – excluding satellites which are farther away but would be projected in the line-of-sight. It is thus imperative to survey for additional dwarf galaxies in a larger area around NGC 891 to test the abundance of dwarf galaxies and compare this to the number of satellites around the Milky Way.

scholarly journals TIDAL INTERACTIONS AT THE EDGE OF THE LOCAL GROUP: NEW EVIDENCE FOR TIDAL FEATURES IN THE ANTLIA DWARF GALAXY

2012 ◽  
Vol 758 (2) ◽  
pp. L32 ◽  
Author(s):  
Samantha J. Penny ◽  
Kevin A. Pimbblet ◽  
Christopher J. Conselice ◽  
Michael J. I. Brown ◽  
Ruth Grützbauch ◽  
...  
Keyword(s):  
Local Group ◽  
Dwarf Galaxy ◽  
Tidal Interactions ◽  
New Evidence

scholarly journals An Observational Limit on the Dwarf Galaxy Population of the Local Group

2007 ◽  
Vol 133 (2) ◽  
pp. 715-733 ◽  
Author(s):  
Alan B. Whiting ◽  
George K. T. Hau ◽  
Mike Irwin ◽  
Miguel Verdugo
Keyword(s):  
Local Group ◽  
Dwarf Galaxy ◽  
Galaxy Population

A new member of the Local Group - The Tucana dwarf galaxy

1992 ◽  
Vol 103 ◽  
pp. 81 ◽  
Author(s):  
Russell J. Lavery ◽  
Kenneth J. Mighell
Keyword(s):  
Local Group ◽  
Dwarf Galaxy

scholarly journals The dwarf galaxy satellite system of Centaurus A

2019 ◽  
Vol 629 ◽  
pp. A18 ◽  
Author(s):  
Oliver Müller ◽  
Marina Rejkuba ◽  
Marcel S. Pawlowski ◽  
Rodrigo Ibata ◽  
Federico Lelli ◽  
...  
Keyword(s):  
Luminosity Function ◽  
Local Group ◽  
Dwarf Galaxies ◽  
Dwarf Galaxy ◽  
3D Structure ◽  
Major Axis ◽  
Asymptotic Giant Branch ◽  
Semi Major Axis ◽  
Distance Measurements ◽  
Red Giant

Dwarf galaxy satellite systems are essential probes to test models of structure formation, making it necessary to establish a census of dwarf galaxies outside of our own Local Group. We present deep FORS2 VI band images from the ESO Very Large Telescope (VLT) for 15 dwarf galaxy candidates in the Centaurus group of galaxies. We confirm nine dwarfs to be members of Cen A by measuring their distances using a Bayesian approach to determine the tip of the red giant branch luminosity. We have also fit theoretical isochrones to measure their mean metallicities. The properties of the new dwarfs are similar to those in the Local Group in terms of their sizes, luminosities, and mean metallicities. Within our photometric precision, there is no evidence of a metallicity spread, but we do observe possible extended star formation in several galaxies, as evidenced by a population of asymptotic giant branch stars brighter than the red giant branch tip. The new dwarfs do not show any signs of tidal disruption. Together with the recently reported dwarf galaxies by the complementary PISCeS survey, we study the luminosity function and 3D structure of the group. By comparing the observed luminosity function to the high-resolution cosmological simulation IllustrisTNG, we find agreement within a 90% confidence interval. However, Cen A seems to be missing its brightest satellites and has an overabundance of the faintest dwarfs in comparison to its simulated analogs. In terms of the overall 3D distribution of the observed satellites, we find that the whole structure is flattened along the line-of-sight, with a root-mean-square (rms) height of 130 kpc and an rms semi-major axis length of 330 kpc. Future distance measurements of the remaining dwarf galaxy candidates are needed to complete the census of dwarf galaxies in the Centaurus group.

scholarly journals DETECTABILITY OF LOCAL GROUP DWARF GALAXY ANALOGUES AT HIGH REDSHIFTS

2015 ◽  
Vol 815 (2) ◽  
pp. L28 ◽  
Author(s):  
Anna Patej ◽  
Abraham Loeb
Keyword(s):  
Local Group ◽  
Dwarf Galaxy
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