263 research outputs found
Properties of the most metal-poor gas-rich LSB dwarf galaxies SDSS J0015+0104 and J2354-0005 residing in the Eridanus void
SDSS J0015+0104 is the lowest metallicity low surface brightness dwarf (LSBD)
galaxy known. The oxygen abundance in its HII region SDSS J001520.70+010436.9
(at ~1.5 kpc from the galaxy centre) is 12+log(O/H)=7.07 (Guseva et al.). This
galaxy, at the distance of 28.4 Mpc, appears to reside deeply in the volume
devoid of luminous massive galaxies, known as the Eridanus void. SDSS
J235437.29-000501.6 is another Eridanus void LSBD galaxy, with parameter
12+log(O/H)=7.36 (also Guseva et al.). We present the results of their HI
observations with the Nancay Radio Telescope revealing their high ratios of
M(HI)/L_B ~2.3. Based on the Sloan Digital Sky Survey images, we derived for
both galaxies their radial surface brightness profiles and the main photometric
parameters. Their colours and total magnitudes are used to estimate the galaxy
stellar mass and ages. The related gas mass-fractions, f_g ~0.98 and ~0.97, and
the extremely low metallicities (much lower than for their more typical
counterparts with the same luminosity) indicate their unevolved status. We
compare these Eridanus void LSBDs with several extreme LSBD galaxies residing
in the nearby Lynx-Cancer void. Based on the combination of all their unusual
properties, the two discussed LSBD galaxies are similar to the unusual LSBDs
residing in the closer void. This finding presents additional evidence for the
existence in voids of a4 figures, sizable fraction of low-mass unevolved
galaxies. Their dedicated search might result in the substantial increase of
the number of such objects in the local Universe and in the advancement of
understanding their nature.Comment: 8 pages, 4 figures, 2 tables, accepted to MNRAS 02.04.2013. arXiv
admin note: text overlap with arXiv:0909.134
Discovery of a massive variable star with Z=Zo/36 in the galaxy DDO 68
The Local Volume dwarf galaxy DDO 68, from the spectroscopy of its two
brightest HII regions (Knots 1 and 2) was designated as the second most
metal-poor star-forming galaxy [12+log(O/H)=7.14]. In the repeated spectral
observations in 2008 January with the 6-m telescope (BTA) of the HII region
Knot 3 [having 12+log(O/H)=7.10+-0.06], we find a strong evidence of a
transient event related to a massive star evolution. From the follow-up
observation with the higher spectral resolution in 2008 February, we confirm
this phenomenon, and give parameters of its emission-line spectrum comprising
of Balmer HI and HeI lines. The luminosities of the strongest transient lines
(Ha, Hb) are of a few 10^36 erg s^-1. We also detected an additional continuum
component in the new spectrum of Knot 3, which displays the spectral energy
distribution raising to ultraviolet. The estimate of the flux of this continuum
leads us to its absolute V-band magnitude of ~-7.1. Based on the spectral
properties of this transient component, we suggest that it is related to an
evolved massive star of luminous blue variable type with Z=Zo/36. We briefly
discuss observational constraints on parameters of this unique (in the aspect
of the record low metallicity of the progenitor massive star) event and propose
several lines of its study.Comment: 6 pages, 5 Postscript figures, to appear in MNRAS Letters in June
2008 issu
Environment status of blue compact galaxies and trigger of star formation
(abridged) The work studies active star formation (SF) and a possible trigger
of SF bursts due to gravitational interaction. Following the study by Taylor et
al. we extend the search for possible disturbing galaxies of various masses to
a much larger sample of 86 BCGs from the sky region of Second Byurakan survey.
The sample under study is separated by the criteria: EW([O III]5007 > 45 A and
V < 6,000 km/s and should be representative of all low-mass galaxies which
experience SF bursts. We argue that the moderate tidal disturbers should be
taken into account, and incorporate the respective range of distances in the
search for disturbing neighbours. The majority of the neighbours in the
vicinity of the studied BCGs are found through the study of their environment
among UZC galaxies, and the follow-up careful search of the fainter galaxies in
the NED database. For the remaining BCGs, the neighbouring galaxies are found
based on the results of the 6-m telescope spectroscopy. By studing the data on
the radial velocities of galaxies in the vicinity of BCGs we found: 1) 33 of
the studied BCGs (38.5 %) are associated with significantly brighter galaxies
(DB > 1.5 mag); 2) 23 BCGs (26.5%) have neighbours either of comparable or
significantly lower brightness; 3) 14 of the studied BCGs (16%) with no evident
associated galaxy are either certain, or probable, mergers. We conclude that in
\~80% (or more) BCGs from the studied sample, the SF bursts are triggered
either by tidal action of various strengths from other galaxies, or due to
mergers of low-mass galaxies. We briefly discuss the implications of our main
conclusion for evolutionary links of BCGs to other types of low-mass galaxies.
Among the ``isolated'' BCGs (without a bright neighbour) 43+-10% are probably
disturbed by dwarf galaxies and 26+-8% have a merger morphology.Comment: 22 pages, 7 figures, accepted to A&A on March 26, 200
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