Hα survey of the local volume: Isolated southern galaxies

Кайсин, С. С.; Kasparova, Anastasia V.; Knyazev, A. Yu.; Караченцев, И. Д.

doi:10.1134/s1063773707050015

Cited by 13 publications

(17 citation statements)

References 24 publications

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“…This implies that the absolute magnitude of the galaxy is M V = −13.24. Although UKS 2323-326 contains a young stellar component, there is no evidence of significant H ii emission (Miller 1996;Kaisin et al 2007), which suggests a very low rate of ongoing star formation. No mid-infrared emission from hot dust nor polycyclic aromatic hydrocarbon is detected at 8 µm (Jackson et al 2006) but it is embedded in a neutral hydrogen cloud that asymmetrically covers the whole galaxy (e.g., Buyle et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Resolving stellar populations outside the Local Group: MAD observations of UKS 2323-326

Gullieuszik

Greggio

Held

et al. 2008

A&A

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Aims. We present a study aimed at deriving constraints on star formation at intermediate ages from the evolved stellar populations in the dwarf irregular galaxy UKS 2323-326. These observations were also intended to demonstrate the scientific capabilities of the multi-conjugated adaptive optics demonstrator (MAD) implemented at the ESO Very Large Telescope as a test-bench of adaptive optics (AO) techniques. Methods. We perform accurate, deep photometry of the field using J and K s band AO images of the central region of the galaxy. Results. The near-infrared (IR) colour-magnitude diagrams clearly show the sequences of asymptotic giant branch (AGB) stars, red supergiants, and red giant branch (RGB) stars down to ∼1 mag below the RGB tip. Optical-near-IR diagrams, obtained by combining our data with Hubble Space Telescope observations, provide the best separation of stars in the various evolutionary stages. The counts of AGB stars brighter than the RGB tip allow us to estimate the star formation at intermediate ages. Assuming a Salpeter initial mass function, we find that the star formation episode at intermediate ages produced ∼6 × 10 5 M of stars in the observed region.

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Section: Introductionmentioning

confidence: 99%

Resolving stellar populations outside the Local Group: MAD observations of UKS 2323-326

Gullieuszik

Greggio

Held

et al. 2008

A&A

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“…This isolated galaxy is the closest BCD galaxy and has large extended regions of star formation visible in the optical images (Karachentsev et al 2006). IC 4662 is considered a bursting galaxy based on its Hα EW measurements (Lee et al 2009) and by the SFRs derived from their Hα spectra (e.g., Hunter & Elmegreen 2004;Kaisin et al 2007). The SFRs in Figure 13 are a composite of star formation activity summed from the regions of differing stellar density in the galaxy.…”

Section: Star Formation Historiesmentioning

confidence: 99%

THE TRUE DURATIONS OF STARBURSTS:HUBBLE SPACE TELESCOPEOBSERVATIONS OF THREE NEARBY DWARF STARBURST GALAXIES

McQuinn

Skillman

Cannon

et al. 2009

ApJ

100

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The duration of a starburst is a fundamental parameter affecting the evolution of galaxies yet, to date, observational constraints on the durations of starbursts are not well established. Here we study the recent star formation histories of three nearby dwarf galaxies to rigorously quantify the duration of their starburst events using a uniform and consistent approach. We find that the bursts range from ∼200 to ∼400 Myr in duration resolving the tension between the shorter timescales often derived observationally with the longer timescales derived from dynamical arguments. If these three starbursts are typical of starbursts in dwarf galaxies, then the short timescales (3-10 Myr) associated with starbursts in previous studies are best understood as "flickering" events which are simply small components of the larger starburst. In this sample of three nearby dwarfs, the bursts are not localized events. All three systems show bursting levels of star formation in regions of both high and low stellar density. The enhanced star formation moves around the galaxy during the bursts and covers a large fraction of the area of the galaxy. These massive, long-duration bursts can significantly affect the structure, dynamics, and chemical evolution of the host galaxy and can be the progenitors of "superwinds" that drive much of the recently chemically enriched material from the galaxy into the intergalactic medium.

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“…The first column of the table contains a link to the paper, the second contains the number of LV galaxies imaged in Hα, and the third column reflects the nature of the sample (the morphological type of galaxies or their affiliation to a fixed group). The last row of the table summarizes the number of LV galaxies, which were observed in our program Kaisin & Karachentsev 2006Kaisin et al 2007;, including the results of this paper. Unlike all previous observational programs, our Hα survey of LV galaxies does not imply any selection of objects by morphological type, or their affiliation to a group.…”

Section: Introductionmentioning

confidence: 99%

MORE GALAXIES IN THE LOCAL VOLUME IMAGED IN Hα

Караченцев

Кайсин

2010

The Astronomical Journal

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We have carried out an Hα flux measurement for 52 nearby galaxies as part of a general Hα imaging survey for the Local Volume sample of galaxies within 10 Mpc. Most of the objects are probable members of the groups around Maffei 2/IC 342, NGC 672/IC 1727, NGC 784, and the Orion galaxy. The measured Hα fluxes corrected for extinction are used to derive the galaxy star formation rate (SFR). We briefly discuss some basic scaling relations between SFR, hydrogen mass, and absolute magnitude of the Local Volume galaxies. The total SFR density in the local (z = 0) universe is estimated to be (0.019 ± 0.003)M yr −1 Mpc −3 .

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Hα survey of the local volume: Isolated southern galaxies

Cited by 13 publications

References 24 publications

Resolving stellar populations outside the Local Group: MAD observations of UKS 2323-326

Resolving stellar populations outside the Local Group: MAD observations of UKS 2323-326

THE TRUE DURATIONS OF STARBURSTS:HUBBLE SPACE TELESCOPEOBSERVATIONS OF THREE NEARBY DWARF STARBURST GALAXIES

MORE GALAXIES IN THE LOCAL VOLUME IMAGED IN Hα

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