Study of DDO 68: nearest candidate for a young galaxy?

Pustilnik, S. A.; Kniazev, A. Y.; Pramskij, A. G.

doi:10.1051/0004-6361:20053102

Cited by 97 publications

(166 citation statements)

References 72 publications

(91 reference statements)

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“…Summarising, we conclude that previous (e.g., van Zee et al (1998), Pustilnik et al (2001b), Pustilnik et al (2005) for I Zw 18, SBS 0335-052 E,W and DDO 68) and new (Ekta et al, in prep. for UGC 772 and SDSS J2134-0035) observational data indicate that starbursts in all the lowest metallicity (O/H < 7.30) XMD BCGs, which are "massive" objects with M(gas) of (2.6-12)×10 8 M ⊙ , are related to mergers and strong interactions.…”

Section: Interactions/mergers In Xmd Bcgssupporting

confidence: 73%

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“Dark Galaxies” and Local Very Metal-Poor Gas-Rich Glaxies: Possible Interrelations

Pustilnik

2007

Proc. IAU

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Abstract. There are only a few "dark galaxy" candidates discovered to date in the local Universe. One of the most prominent of them is the SW component of a merging system HI 1225+01. On the other hand, the number of known very metal-poor gas-rich dwarfs similar to I Zw 18 and SBS 0335-052 E,W has grown drastically during the last decade, from a dozen and a half to about five dozen. Many of them are very gas-rich, having from ∼90 to 99 % of all baryons in gas. For some of such objects that have the deep photometry data, no evidences for the light of old stars are found. At least a half of such galaxies with the prominent starbursts have various evidences of interactions, including advanced mergers. This suggests that a fraction of this group objects can be a kind of very stable protogalaxies (or "dark galaxies"), which have recently experienced strong disturbances from nearby massive galaxy-size bodies. Such a collision caused the gas instabilities and its collapse with the subsequent onset of starburst. We briefly discuss the morphology and gas kinematics for the subsample of the most metal-poor dwarfs that illustrate this picture. We discuss also the relation of these rare galaxies to the processes by which "dark galaxies" can occasionally transform to optically visible galaxies.

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Section: Interactions/mergers In Xmd Bcgssupporting

confidence: 73%

“…There are indications that XMD galaxies probably favour the void-like environment (e.g., Pustilnik et al (2005), Pustilnik et al (2006), Pustilnik & Kniazev (2007)). …”

Section: Interactions/mergers In Xmd Bcgsmentioning

confidence: 99%

“Dark Galaxies” and Local Very Metal-Poor Gas-Rich Glaxies: Possible Interrelations

Pustilnik

2007

Proc. IAU

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“…(The closest SDSS source, SDSSJ095646.04+284943.7, is only part of this larger galaxy). It has been classified as a very metal-deficient Im/BCD by Pustilnik, Kniazev & Pramskij (2005) and included in the Pustilnik et al (2011) list of extremely low surface brightness galaxies. It again has very blue g − r 0.…”

Section: Galaxy 2079; Sdssj09564604+2849437mentioning

confidence: 99%

X-ray sources in dwarf galaxies in the Virgo cluster and the nearby field

Papadopoulou

Phillipps

Young

2016

Mon. Not. R. Astron. Soc.

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The extent to which dwarf galaxies represent essentially scaled down versions of giant galaxies is an important question with regards the formation and evolution of the galaxy population as a whole. Here, we address the specific question of whether dwarf galaxies behave like smaller versions of giants in terms of their X-ray properties. We discuss two samples of around 100 objects each, dwarfs in the Virgo cluster and dwarfs in a large Northern hemisphere area. We find nine dwarfs in each sample with Chandra detections. For the Virgo sample, these are in dwarf elliptical (or dwarf lenticular) galaxies and we assume that these are (mostly) low-mass X-ray binaries (LMXB) [some may be nuclear sources]. We find a detection rate entirely consistent with scaling down from massive ellipticals, viz. about one bright (i.e. L X > 10 38 erg s −1 ) LMXB per 5 × 10 9 M of stars. For the field sample, we find one (known) Seyfert nucleus, in a galaxy which appears to be the lowest mass dwarf with a confirmed X-ray emitting nucleus. The other detections are in star-forming dwarf irregular or blue compact dwarf galaxies and are presumably high-mass X-ray binaries (HMXB). This time, we find a very similar detection rate to that in large late-type galaxies if we scale down by star formation rate, roughly one HMXB for a rate of 0.3 M per year. Nevertheless, there does seem to be one clear difference, in that the dwarf late-type galaxies with X-ray sources appear strongly biased to very low metallicity systems.

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“…in Pustilnik et al (2005). Position-Velocity (P-V) diagrams for the Hα emission line were derived using a MIDAS 1 program for reduction of long-slit spectra written by Makarov and Kniazev.…”

Section: Optical Observationsmentioning

confidence: 99%

“…The gas phase metallicity and photometrical properties of the void galaxy population have been presented in ;Perepelitsyna, Pustilnik, Kniazev (2014). Detailed studies of some peculiar galaxies located in this region can be found in Chengalur et al (2006); Pustilnik et al (2005; Chengalur & Pustilnik (2013). The galaxies studied in the last cited works are unusual in that they have a very large M (Hi)/LB ratio, unusually blue colours, and/or very low metallicity.…”

Section: Introductionmentioning

confidence: 99%

Study of the Lynx-Cancer void galaxies. – V. The extremely isolated galaxy UGC 4722

Chengalur

Pustilnik

Макаров

et al. 2015

Monthly Notices of the Royal Astronomical Society

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We present a detailed study of the extremely isolated Sdm galaxy UGC 4722 (M B = −17.4) located in the nearby Lynx-Cancer void. UGC 4722 is a member of the catalogue of isolated galaxies, and has also been identified as one of the most isolated galaxies in the Local Supercluster. Optical images of the galaxy however show that it has a peculiar morphology with an elongated ∼14 kpc-long plume. New observations with the Russian 6-m telescope (BTA) and the Giant Metrewave Radio Telescope (GMRT) of the ionised and neutral gas in UGC 4722 reveal the second component responsible for the disturbed morphology of the system. This is a small, almost completely destroyed, very gas-rich dwarf (M B = −15.2, M (Hi)/L B ∼ 4.3) We estimate the oxygen abundance for both galaxies to be 12 + log(O/H) ∼ 7.5 − 7.6 which is 2-3 times lower than what is expected from the luminosity-metallicity relation for similar galaxies in denser environments. The ugr colours of the plume derived from Sloan Digital Sky Survey (SDSS) images are consistent with a simple stellar population with a post starburst age of 0.45-0.5 Gyr. This system hence appears to be the first known case of a minor merger with a prominent tidal feature consisting of a young stellar population.

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Study of DDO 68: nearest candidate for a young galaxy?

Cited by 97 publications

References 72 publications

“Dark Galaxies” and Local Very Metal-Poor Gas-Rich Glaxies: Possible Interrelations

“Dark Galaxies” and Local Very Metal-Poor Gas-Rich Glaxies: Possible Interrelations

X-ray sources in dwarf galaxies in the Virgo cluster and the nearby field

Study of the Lynx-Cancer void galaxies. – V. The extremely isolated galaxy UGC 4722

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