Surface photometry of new nearby dwarf galaxies

Макарова, Л. Н.; Караченцев, И. Д.; Grebel, Eva K.; Barsunova, O. Yu.

doi:10.1051/0004-6361:20020006

Cited by 23 publications

(37 citation statements)

References 22 publications

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“…We show that this galaxy contains a predominantly young stellar population, consistent with it being a recently formed TDG, as suggested by Makarova et al (2002).…”

Section: Introductionsupporting

confidence: 85%

“…The stellar content of Holmberg ix was recently investigated by Makarova et al (2002 Makarova et al (2002), and readily detect stars along the upper RGB, allowing us to set strong limits on the presence of old stars in Holmberg ix. We show that this galaxy contains a predominantly young stellar population, consistent with it being a recently formed TDG, as suggested by Makarova et al (2002).…”

Section: Introductionmentioning

confidence: 99%

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Holmberg IX: The Nearest Young Galaxy

Sabbi

Gallagher

Smith

et al. 2008

ApJ

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Deep images taken with the Wide Field Channel of the Advanced Camera for Surveys on board the Hubble Space Telescope provide the basis for study the resolved stellar population of the M81 companion dwarf irregular galaxy Holmberg ix. Based on color-magnitude diagrams the stellar population toward Holmberg ix contains numerous stars with ages of 200 Myr as well as older red giant stars. By charting the spatial distribution of the red giant stars and considering their inferred metallicities, we concluded that most of these older stars are associated with M81 or its tidal debris. At least 20% of the stellar mass in Holmberg ixwas produced in the last ∼ 200 Myr, giving it the youngest stellar populations if any nearby galaxy. The location of Holmberg ix, its high gas content, and its youthful stellar population suggests that it is a tidal dwarf galaxy, perhaps formed during the last close passage of M82 around M81.

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“…We show that this galaxy contains a predominantly young stellar population, consistent with it being a recently formed TDG, as suggested by Makarova et al (2002).…”

Section: Introductionsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Holmberg IX: The Nearest Young Galaxy

Sabbi

Gallagher

Smith

et al. 2008

ApJ

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“…Our observations of this galaxy at the 3.5-m telescope of Apache Point Observatory (USA) show that Arp-loop has an extremely low surface brightness, which is fainter than 26 mag arcsec −2 in the V band (Makarova et al 2002).…”

Section: Arp-loop (A0952+69)mentioning

confidence: 74%

Tidal dwarfs in the M81 group: The second generation?

Макарова

Grebel

Караченцев

et al. 2002

A&A

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116

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Abstract. We derive quantitative star formation histories of the four suspected tidal dwarf galaxies in the M 81 group, Holmberg IX, BK3N, Arp-loop (A0952+69), and Garland, using Hubble Space Telescope/Wide Field Planetary Camera 2 images in F606W and F814W obtained as part of a Snapshot survey of dwarf galaxies in the Local Universe. We consider the spatial distribution and ages of resolved stellar populations in these dwarf irregular galaxies. We use synthetic color-magnitude diagrams to derive the ages of the major star formation episodes, star formation rates, and approximate metallicity ranges. All the galaxies show evidence of continuous star formation between about 20 and 200 Myr ago with star formation rates in the range 7.5 × 10 −3 -7.6 × 10 −4 M yr −1 . The metallicity of the detected stars spans a wide range, and have lower than solar abundance. A possible scenario is that all four dwarf galaxies were formed from material in the metal-poor outer part of the giant spiral galaxy M 81 after the tidal interaction between M 81, M 82, and NGC 3077 ∼ 200 Myr ago. While we do not directly detect pronounced old stellar populations, the photometric limits of our data are such that the presence of such a population is not entirely ruled out.

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“…IV. (e.g., Makarova et al 2002). This type of dwarf is supposed to have formed out of the baryonic material coming from a close interaction episode of the parent galaxy (in this case, the spiral M 81), and thus a tidal dwarf should be a dark matter-free object (e.g., Toomre & Toomre 1972;Duc et al 1997Duc et al , 2000.…”

Section: Star Formation Parameters As a Function Of Environmentmentioning

confidence: 99%

A close look at the Centaurus A group of galaxies

Crnojević

Grebel

Cole

2012

A&A

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Aims. We study a sample of five dwarf irregular galaxies in the CenA/M 83 group, which are companions to the giant elliptical CenA. We aim at deriving their physical properties over their lifetime and compare them to those of dwarfs located in different environments. Methods. We use archival HST/ACS data and apply synthetic color-magnitude diagram fitting in order to reconstruct the past star formation activity of the target galaxies. Results. The average star formation rate for the studied galaxies ranges from 10 −3 M yr −1 up to ∼7 × 10 −2 M yr −1 , and their mean metallicities correlate with their luminosities (from [Fe/H] ∼ −1.4 up to ∼−1.0). The form of the star formation histories varies across the sample, with quiescent periods alternating with intermittent enhancements in the star formation (from a few up to several times the average lifetime value). The dwarfs in this sample formed ∼35% to 60% of their stellar content prior to ∼5 Gyr ago. Conclusions. The resulting star formation histories for the CenA companions are similar to those found for comparable Local Group and M 81 group dwarfs. We consider this sample of dwarfs together with five previously studied M 83 dwarf irregular companions. We find no trend of the average star formation rate with tidal index or distance from the main galaxy of the group. However, dwarfs with higher baryonic masses do show higher average star formation rates, underlining the importance of intrinsic properties in governing the evolution of these galaxies. On the other hand, there is also a clear trend when looking at the recent (∼0.5−1 Gyr) level of activity. Namely, dwarfs within a denser region of the group appear to have had their star formation quenched while dwarfs located in the group outskirts show a wide range of possible star formation rates, thus indicating that external processes play a fundamental role, complementary to mass, in shaping the star formation histories of dwarf galaxies.

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Surface photometry of new nearby dwarf galaxies

Cited by 23 publications

References 22 publications

Holmberg IX: The Nearest Young Galaxy

Holmberg IX: The Nearest Young Galaxy

Tidal dwarfs in the M81 group: The second generation?

A close look at the Centaurus A group of galaxies

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