115 research outputs found
Spiral eigenmodes triggered by grooves in the phase space of disc galaxies
We use linear perturbation theory to investigate how a groove in the phase
space of a disc galaxy changes the stellar disc's stability properties. Such a
groove is a narrow trough around a fixed angular momentum from which most stars
have been removed, rendering part of the disc unresponsive to spiral waves. We
find that a groove can dramatically alter a disc's eigenmode spectrum by giving
rise to a set of vigorously growing eigenmodes. These eigenmodes are particular
to the grooved disc and are absent from the original ungrooved disc's mode
spectrum. We discuss the properties and possible origin of the different
families of new modes.
By the very nature of our technique, we prove that a narrow phase-space
groove can be a source of rapidly growing spiral patterns that are true
eigenmodes of the grooved disc and that no non-linear processes need to be
invoked to explain their presence in N-body simulations of disc galaxies. Our
results lend support to the idea that spiral structure can be a recurrent
phenomenon, in which one generation of spiral modes alters a disc galaxy's
phase space in such a way that a following generation of modes is destabilized.Comment: 18 pages, 17 figures, accepted for publication in MNRA
FCC046: a candidate gaseous polar ring dwarf elliptical galaxy in the Fornax Cluster
FCC046 is a Fornax Cluster dwarf elliptical galaxy. Optical observations have
shown that this galaxy, besides an old and metal-poor stellar population, also
contains a very young centrally concentrated population and is actively forming
stars, albeit at a very low level. Here, we report on 21cm observations of
FCC046 with the Australia Telescope Compact Array (ATCA) which we conducted in
the course of a small survey of Fornax Cluster early-type dwarf galaxies. We
have discovered a ~10^7 Mo HI cloud surrounding FCC046. We show that the
presence of this significant gas reservoir offers a concise explanation for
this galaxy's optical morphological and kinematical properties. Surprisingly,
the HI gas, as evidenced by its morphology and its rotational motion around the
galaxy's optical major axis, is kinematically decoupled from the galaxy's
stellar body. This is the first time such a ring of gaseous material in
minor-axis rotation is discovered around a dwarf galaxy.Comment: 5 pages, 4 figures, published in Astrophysical Journal Letter
How the first stars shaped the faintest gas-dominated dwarf galaxies
Low-mass dwarf galaxies are very sensitive test-beds for theories of cosmic
structure formation since their weak gravitational fields allow the effects of
the relevant physical processes to clearly stand out. Up to now, no unified
account exists of the sometimes seemingly conflicting properties of the
faintest isolated dwarfs in and around the Local Group, such as Leo T and the
recently discovered Leo P and Pisces A systems. Using new numerical
simulations, we show that this serious challenge to our understanding of galaxy
formation can be effectively resolved by taking into account the regulating
influence of the ultraviolet radiation of the first population of stars on a
dwarf's star formation rate while otherwise staying within the standard
cosmological paradigm for structure formation. These simulations produce faint,
gas-dominated, star-forming dwarf galaxies that lie on the baryonic
Tully-Fisher relation and that successfully reproduce a broad range of
chemical, kinematical, and structural observables of real late-type dwarf
galaxies. Furthermore, we stress the importance of obtaining properties of
simulated galaxies in a manner as close as possible to the typically employed
observational techniques.Comment: 13 pages, 2 tables, 12 figures. Accepted for publication in Ap
Constraining the subgrid physics in simulations of isolated dwarf galaxies
Simulating dwarf galaxy halos in a reionizing Universe puts severe
constraints on the sub-grid model employed in the simulations. Using the same
sub-grid model that works for simulations without a UV-background (UVB) results
in gas poor galaxies that stop forming stars very early on, except for halos
with high masses. This is in strong disagreement with observed galaxies, which
are gas rich and star forming down to a much lower mass range. To resolve this
discrepancy, we ran a large suite of isolated dwarf galaxy simulations to
explore a wide variety of sub-grid models and parameters, including timing and
strength of the UVB, strength of the stellar feedback, and metallicity
dependent Pop III feedback. We compared these simulations to observed dwarf
galaxies by means of the baryonic Tully-Fisher relation (BTFR), which links the
baryonic content of a galaxy to the observationally determined strength of its
gravitational potential. We found that the results are robust to changes in the
UVB. The strength of the stellar feedback shifts the results on the BTFR, but
does not help to form gas rich galaxies at late redshifts. Only by including
Pop III feedback are we able to produce galaxies that lie on the observational
BTFR and that have neutral gas and ongoing star formation at redshift zero.Comment: Accepted for publication in MNRAS. 25 pages, 2 tables and 36 figures.
Interactive plots can be found on http://www.dwarfs.ugent.be/btfr
The dynamics of general relativistic isotropic stellar cluster models -- Do relativistic extensions of the Plummer model exist?
We show that the general relativistic theory of the dynamics of isotropic
stellar clusters can be developed essentially along the same lines as the
Newtonian theory. We prove that the distribution function can be derived from
any isotropic momentum moment and that every higher-order moment of the
distribution can be written as an integral over a zeroth-order moment.
We propose a mathematically simple expression for the distribution function
of a family of isotropic general relativistic cluster models and investigate
their dynamical properties. In the Newtonian limit, these models obtain a
distribution function of the form F(E) ~ (E-E_0)^alpha, with E binding energy
and E_0 a constant that determines the model's outer radius. The slope alpha
sets the steepness of the distribution function and the corresponding radial
density and pressure profiles. We show that the field equations only yield
solutions with finite mass for alpha3.5,
only Newtonian models exist. In other words: within the context of this family
of models, no general relativistic version of the Plummer model exists. The
most strongly bound model within the family is characterized by alpha=2.75 and
a central redshift z_c~0.55.Comment: 10 pages, 5 figures, accepted for publication by MNRA
N-body/SPH study of the evolution of dwarf galaxies in a cluster environment
Using an N-body/SPH code, we explore the scenario in which a dwarf elliptical
galaxy (dE) is subjected to ram-pressure stripping due to the intracluster
medium (ICM). Our simulations show that while (i) smaller dEs lose their ISM
almost immediately after entering the cluster, (ii) more massive dEs are able
to retain their gas for considerable timespans.Comment: 1 page, no figures, poster contribution to the Splinter Meeting
"Galaxies in interaction" at the joint meeting of the Czech Astronomical
Society and the Astronomische Gesellschaft (20-25 Sept. 2004, Prague, Czech
Republic
Physics of a partially ionized gas relevant to galaxy formation simulations -- the ionization potential energy reservoir
Simulation codes for galaxy formation and evolution take on board as many
physical processes as possible beyond the standard gravitational and
hydrodynamical physics. Most of this extra physics takes place below the
resolution level of the simulations and is added in a sub-grid fashion.
However, these sub-grid processes affect the macroscopic hydrodynamical
properties of the gas and thus couple to the on-grid physics that is explicitly
integrated during the simulation. In this paper, we focus on the link between
partial ionization and the hydrodynamical equations. We show that the energy
stored in ions and free electrons constitutes a potential energy term which
breaks the linear dependence of the internal energy on temperature. Correctly
taking into account ionization hence requires modifying both the equation of
state and the energy-temperature relation. We implemented these changes in the
cosmological simulation code Gadget2. As an example of the effects of these
changes, we study the propagation of Sedov-Taylor shock waves through an
ionizing medium. This serves as a proxy for the absorption of supernova
feedback energy by the interstellar medium. Depending on the density and
temperature of the surrounding gas, we find that up to 50% of the feedback
energy is spent ionizing the gas rather than heating it. Thus, it can be
expected that properly taking into account ionization effects in galaxy
evolution simulations will drastically reduce the effects of thermal feedback.
To the best of our knowledge, this potential energy term is not used in current
simulations of galaxy formation and evolution.Comment: 8 pages, 4 figures. Accepted for publication in Ap
The transmutation of dwarf galaxies : stellar populations
Transition-type dwarf (TTD) galaxies share characteristics of early-and late-type dwarfs. Thus, they are suspected to be the thread that connects them. We selected 19 TTD galaxies in the nearby Universe (cz < 2900 km s(-1)) from the Sloan Digital Sky Survey. They span the luminosity range from similar to-14.5 to -19.0 mag in the B band, and are located in different environments.
We derive their single stellar population parameters and star formation histories, using the full spectrum fitting technique with two independent population synthesis models. Irrespective of the synthesis models, we find that these dwarfs have a relatively young mean age (around 1-2 Gyr) and low metallicities (similar to-0.7 dex). Moreover, they had approximately constant star formation rates until a few Gyr ago, associated with strong metal enrichment during the first few Gyr of their evolution. We compare these results with the results from Koleva et al., who studied dwarf elliptical (dE) galaxies in the same luminosity range. We find that (1) both samples occupy the same region in the luminosity-metallicity relation, (2) the build-up of the stellar mass in both types of galaxies is very similar, with most of the stars already formed 5 Gyr ago and (3) contrary to the dEs, TTDs are forming stars at present, but after 1 Gyr of passive evolution, their star formation histories would appear identical to that of dEs.
As far as the stellar population is concerned, the transformation of TTDs into dEs is definitely possible. A star-forming dwarf galaxy can be stripped of at least a fraction of its gas, and its star formation rate can be reduced to that of the TTDs of the present sample. Continued gas removal may drive a galaxy to the state of a gas-depleted bona fide dE. However, we cannot exclude a scenario where a star-forming galaxy is rapidly transformed into an early type without passing through a noticeable 'transition' phase, as suggested by the relatively small fraction of observed dEs with an interstellar medium. We cannot exclude swinging back and forth between a late-type dwarf and a TTD (in the case of episodic star formation) or an early-type dwarf and a TTD (in the case of gas infall)
The CO content of the Local Group dwarf irregular galaxies IC5152, UGCA438, and the Phoenix dwarf
We present a search for CO(1->0) emission in three Local Group dwarf
irregular galaxies: IC5152, the Phoenix dwarf, and UGCA438, using the ATNF
Mopra radio telescope. Our scans largely cover the optical extent of the
galaxies and the stripped HI cloud West of the Phoenix dwarf. Apart from a
tentative but non-significant emission peak at one position in the Phoenix
dwarf, no significant emission was detected in the CO spectra of these
galaxies. For a velocity width of 6 km/s, we derive 4sigma upper limits of 0.03
K km/s, 0.04 K km/s and 0.06 K km/s for IC5152, the Phoenix dwarf and UGCA438,
respectively. This is an improvement of over a factor of 10 compared with
previous observations of IC5152; the other two galaxies had not yet been
observed at millimeter wavelengths. Assuming a Galactic CO-to-H_2 conversion
factor, we derive upper limits on the molecular gas mass of 6.2 x 10^4 M_sun,
3.7 x 10^3 M_sun and 1.4 x 10^5 M_sun for IC5152, the Phoenix dwarf and
UGCA438, respectively. We investigate two possible causes for the lack of CO
emission in these galaxies. On the one hand, there may be a genuine lack of
molecular gas in these systems, in spite of the presence of large amounts of
neutral gas. However, in the case of IC5152 which is actively forming stars,
molecular gas is at least expected to be present in the star forming regions.
On the other hand, there may be a large increase in the CO-to-H_2 conversion
factor in very low-metallicity dwarfs (-2 <= [Fe/H] <= -1), making CO a poor
tracer of the molecular gas content in dwarf galaxies.Comment: 7 pages, 5 figures, 2 tables, accepted for publication in MNRA
The impact of primordial black holes on the stellar mass function of ultra-faint dwarf galaxies
If primordial black holes constitute the dark matter, stars forming in
dark-matter dominated environments with low velocity dispersions, such as
ultra-faint dwarf galaxies, may capture a black hole at birth. The capture
probability is non-negligible for primordial black holes of masses around
g, and increases with stellar mass. Moreover, infected stars are
turned into virtually invisible black holes on cosmologically short timescales.
Hence, the number of observed massive main-sequence stars in ultra-faint dwarfs
should be suppressed if the dark matter was made of asteroid-mass primordial
black holes. This would impact the measured mass distribution of stars, making
it top-light (i.e. depleted in the high-mass range). Using simulated data that
mimic the present-day observational power of telescopes, we show that already
existing measurements of the mass function of stars in local ultra-faint dwarfs
could be used to constrain the fraction of dark matter composed of primordial
black holes in the -- currently unconstrained -- mass range of
g.Comment: Updated to match the MNRAS version. The mean captured PBH number
(figure 1) was corrected. Most figures as well as some parts of the text are
slightly modifie
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