6,722 research outputs found
Global velocity field and bubbles in the BCD Mrk86
We have studied the velocity field of the Blue Compact Dwarf galaxy Mrk86
(NGC2537) using data provided by 14 long-slit optical spectra. This kinematical
information is complemented with narrow-band ([OIII]5007A and Halpha) and
broad-band (B, V, Gunn-r and K) imaging. The analysis of the galaxy global
velocity field suggests that the ionized gas could be distributed in a rotating
inclined disk, with projected central angular velocity of Omega=34 km/s/kpc.
The comparison between the stellar, HI and modeled dark matter density profile,
indicates that the total mass within its optical radius is dominated by the
stellar component. Peculiarities observed in its velocity field can be
explained by irregularities in the ionized gas distribution or local motions
induced by star formation. Kinematical evidences for two expanding bubbles,
Mrk86-B and Mrk86-C, are given. They show expanding velocities of 34 km/s and
17 km/s, Halpha luminosities of 3x10^38 erg/s and 1.7x10^39 erg/s, and physical
radii of 374 and 120 pc, respectively. The change in the [SII]/Halpha,
[NII]/Halpha, [OII]/[OIII] and [OIII]/Hbeta line ratios with the distance to
the bubble precursor suggests a diminution in the ionization parameter and, in
the case of Mrk86-B, an enhancement of the shock-excited gas emission. The
optical-near-infrared colours of the bubble precursors are characteristic of
low metallicity star forming regions (0.2 Zsun) with burst strengths of about 1
per cent in mass.Comment: 14 pages, 12 PostScript figures, accepted for publication in MNRAS,
also available at ftp://cutrex.fis.ucm.es/pub/OUT/gil/PAPERS
Measuring work and heat in ultracold quantum gases
We propose a feasible experimental scheme to direct measure heat and work in
cold atomic setups. The method is based on a recent proposal which shows that
work is a positive operator valued measure (POVM). In the present contribution,
we demonstrate that the interaction between the atoms and the light
polarisation of a probe laser allows us to implement such POVM. In this way the
work done on or extracted from the atoms after a given process is encoded in
the light quadrature that can be measured with a standard homodyne detection.
The protocol allows one to verify fluctuation theorems and study properties of
the non-unitary dynamics of a given thermodynamic process.Comment: Published version in the Focus Issue on "Quantum Thermodynamics
Mapping the star formation history of Mrk86: I. Data and models
We have obtained optical (BVR, [OIII]5007 and Halpha), near infrared (JHK)
imaging and long-slit optical spectroscopy for the Blue Compact Dwarf galaxy
Mrk86 (NGC2537). In this paper, the first of two, we present optical-near-
infrared colors and emission-line fluxes for the currently star-forming
regions, intemediate aged starburst and underlying stellar population. We also
describe the evolutionary synthesis models used in Paper II. The R and Halpha
luminosity distributions of the galaxy star-forming regions show maxima at
M_R=-9.5 and L_Halpha=10^37.3 erg s^-1. The underlying stellar population shows
an exponential surface brigthness profile with central value, mu_E,0=21.5 mag
arcsec^-2, and scale, alpha=0.88 kpc, both measured in the R-band image. In the
galaxy outer regions, dominated by this component, no significant color
gradients are observed. Finally, a set of evolutionary synthesis models have
been developed, covering a wide range in metallicity and burst strength.Comment: 21 pages, 14 figures, 2 landscape tables, accepted for publication in
Astronomy & Astrophysics Supplement Series, for higher resolution images see
ftp://cutrex.fis.ucm.es/pub/OUT/gil/PAPERS/aa00_I.ps.g
Optical photometry of the UCM Lists I and II
We present Johnson B CCD photometry for the whole sample of galaxies of the
Universidad Complutense de Madrid (UCM) Survey Lists I and II. They constitute
a well-defined and complete sample of galaxies in the Local Universe with
active star formation. The data refer to 191 S0 to Irr galaxies at an averaged
redshift of 0.027, and complement the already published Gunn r, J and K
photometries. In this paper the observational and reduction features are
discussed in detail, and the new colour information is combined to search for
clues on the properties of the galaxies, mainly by comparing our sample with
other surveys.Comment: 14 pages, 7 PostScript figures, accepted for publication in A&AS,
also available vi ftp at ftp://cutrex.fis.ucm.es/pub/OUT/pag/PAPERS
Exotic looped trajectories via quantum marking
We provide an analytical and theoretical study of exotic looped trajectories
(ELTs) in a double-slit interferometer with quantum marking. We use an excited
Rydberg-like atom and which-way detectors such as superconducting cavities,
just as in the Scully-Englert-Walther interferometer. We indicate appropriate
conditions on the atomic beam or superconducting cavities so that we determine
an interference pattern and fringe visibility exclusive from the ELTs. We
quantitatively describe our results for Rubidium atoms and propose this
framework as an alternative scheme to the double-slit experiment modified to
interfere only these exotic trajectories.Comment: 10 pages, 5 figure
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