209 research outputs found
Molecular and ionized gas in tidal dwarf galaxies: the spatially resolved star formation relation
Tidal dwarf galaxies (TDGs) are low-mass objects that form within tidal and/or collisional debris ejected from more massive interacting galaxies. We use CO(1–0) observations from Atacama Large Millimeter/submillimeter Array and integral-field spectroscopy from Multi-Unit Spectroscopic Explorer to study molecular and ionized gas in three TDGs: two around the collisional galaxy NGC 5291 and one in the late-stage merger NGC 7252. The CO and H α emission is more compact than the H I emission and displaced from the H I dynamical centre, so these gas phases cannot be used to study the internal dynamics of TDGs. We use CO, H I, and H α data to measure the surface densities of molecular gas (Σmol), atomic gas (Σatom), and star formation rate (ΣSFR), respectively. We confirm that TDGs follow the same spatially integrated ΣSFR–Σgas relation of regular galaxies, where Σgas = Σmol + Σatom, even though they are H I dominated. We find a more complex behaviour in terms of the spatially resolved ΣSFR–Σmol relation on subkpc scales. The majority (∼60 per cent
) of star-forming regions in TDGs lie on the same ΣSFR–Σmol relation of normal spiral galaxies but show a higher dispersion around the mean. The remaining fraction of star-forming regions (∼40 per cent
) lie in the starburst region and are associated with the formation of massive super star clusters, as shown by Hubble Space Telescope images. We conclude that the local star formation activity in TDGs proceeds in a hybrid fashion, with some regions comparable to normal spiral galaxies and others to extreme starburstsPrograma de doctorado en Astrofisica y Astroinformatica of Universidad de AntofagastaComision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
CONICYT FONDECYT 1211000ANID BASAL project FB210003Spanish Government AYA2017-84897-P
PID2020-114414GB-I00European Union (EU)Junta de Andalucia FQM108European Organisation for Astronomical Research in the Southern Hemisphere under ESO MUSE program 60.A-9320(A)
097.B-0152(A)MUSE WFM-AO commissioning observations at the VLT under Programme 60.A-910
The dust SED in the dwarf galaxy NGC 1569: Indications for an altered dust composition?
We discuss the interpretation of the dust SED from the mid-infrared to the
millimeter range of NGC 1569. The model developed by D\'esert et al. (1990)
including three dust components (Polyaromatic Hydrocarbons, Very Small Grains
and big grains) can explain the data using a realistic interstellar radiation
field and adopting an enhanced abundance of VSGs. A simple three-temperature
model is also able to reproduce the data but requires a very low dust
temperature which is considered to be unlikely in this low-metallicity
starburst galaxy. The high abundance of Very Small Grains might be due to large
grain destruction in supernova shocks. This possibility is supported by ISO
data showing that the emission at 14.3 m, tracing VSGs, is enhanced with
respect to the emission at 6.7 m and 850 m in regions of high star
formation.Comment: 4 pages, conference proceedings paper, "The Spectral Energy
Distribution of Gas-Rich Galaxies: Confronting Models with Data", Heidelberg,
4-8 Oct. 2004, eds. C.C. Popescu & R.J. Tuffs, AIP Conf. Ser., in pres
Molecular Gas in Tidal Dwarf Galaxies: On-going Galaxy Formation
We investigate the process of galaxy formation as can be observed in the only
currently forming galaxies -- the so-called Tidal Dwarf Galaxies, hereafter
TDGs -- through observations of the molecular gas detected via its CO (Carbon
Monoxide) emission. Molecular gas is a key element in the galaxy formation
process, providing the link between a cloud of gas and a {\it bona fide}
galaxy. We have now detected CO in 9 TDGs with an overall detection rate of
80%, showing that molecular gas is abundant in TDGs, up to a few . The CO emission coincides both spatially and kinematically with the
HI emission, indicating that the molecular gas forms from the atomic hydrogen
where the HI column density is high. A possible trend of more evolved TDGs
having greater molecular gas masses is observed, in accord with the
transformation of HI into H. Although uncertainties are still large for
individual objects as the geometry is unknown, we find that the "dynamical"
masses of TDGs, estimated from the CO line widths, do not seem to be greater
than the "visible" masses (HI + H + a stellar component), i.e., TDGs
require no dark matter. We provide evidence that TDGs are self-gravitating
entities, implying that we are witnessing the ensemble of processes in galaxy
formation: concentration of large amounts of gas in a bound object,
condensation of the gas, which is atomic at this point, to form molecular gas
and the subsequent star formation from the dense molecular component.Comment: 8 pages 4 figures, to be published in: Proceedings of the IAU
Symposium 217: Recycling Intergalactic and Interstellar Matte
Star Formation in Collision Debris: Insights from the modeling of their Spectral Energy Distribution
During galaxy-galaxy interactions, massive gas clouds can be injected into
the intergalactic medium which in turn become gravitationally bound, collapse
and form stars, star clusters or even dwarf galaxies. The objects resulting
from this process are both "pristine", as they are forming their first
generation of stars, and chemically evolved because the metallicity inherited
from their parent galaxies is high. Such characteristics make them particularly
interesting laboratories to study star formation. After having investigated
their star-forming properties, we use photospheric, nebular and dust modeling
to analyze here their spectral energy distribution (SED) from the
far-ultraviolet to the mid-infrared regime for a sample of 7 star-forming
regions. Our analysis confirms that the intergalactic star forming regions in
Stephan's Quintet, around Arp 105, and NGC 5291, appear devoid of stellar
populations older than 10^9 years. We also find an excess of light in the
near-infrared regime (from 2 to 4.5 microns) which cannot be attributed to
stellar photospheric or nebular contributions. This excess is correlated with
the star formation rate intensity suggesting that it is probably due to
emission by very small grains fluctuating in temperature as well as the
polycyclic aromatic hydrocarbons (PAH) line at 3.3 micron. Comparing the
attenuation via the Balmer decrement to the mid-infrared emission allows us to
check the reliability of the attenuation estimate. It suggests the presence of
embedded star forming regions in NGC 5291 and NGC 7252. Overall the SED of
star-forming regions in collision debris (and Tidal Dwarf Galaxies) resemble
more that of dusty star-forming regions in galactic disks than to that of
typical star-forming dwarf galaxies.Comment: 22 pages, 24 figures, accepted for publication in A
Cosmic ray propagation and star formation history of NGC 1961
We present new radio continuum data at 4 frequencies on the supermassive,
peculiar galaxy NGC 1961. These observations allow us to separate the thermal
and the nonthermal radio emission and to determine the nonthermal spectral
index distribution. This spectral index distribution in the galactic disk is
unusual: at the maxima of the radio emission the synchrotron spectrum is very
steep, indicating aged cosmic ray electrons. Away from the maxima the spectrum
is much flatter. The steep spectrum of the synchrotron emission at the maxima
indicates that a strong decline of the star formation rate has taken place at
these sites. The extended radio emission is a sign of recent cosmic ray
acceleration, probably by recent star formation. We suggest that a violent
event in the past, most likely a merger or a collision with an intergalactic
gas cloud, has caused the various unusual features of the galaxy.Comment: 9 pages, latex with MN-macros, 20 figures, accepted for publication
in MNRA
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