Catálogo de publicaciones - revistas

<jats:title>Abstract</jats:title> <jats:p>High-resolution optical integral field units (IFUs) are rapidly expanding our knowledge of extragalactic emission nebulae in galaxies and galaxy clusters. By studying the spectra of these objects—which include classic H <jats:sc>ii</jats:sc> regions, supernova remnants, planetary nebulae, and cluster filaments—we are able to constrain their kinematics (velocity and velocity dispersion). In conjunction with additional tools, such as the BPT diagram, we can further classify emission regions based on strong emission-line flux ratios. <jats:monospace>LUCI</jats:monospace> is a simple-to-use python module intended to facilitate the rapid analysis of IFU spectra. <jats:monospace>LUCI</jats:monospace> does this by integrating well-developed pre-existing python tools such as <jats:monospace>astropy</jats:monospace> and <jats:monospace>scipy</jats:monospace> with new machine learning tools for spectral analysis. Furthermore, <jats:monospace>LUCI</jats:monospace> provides several easy-to-use tools to access and fit SITELLE data cubes.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>We present the discovery of two new X-ray transients in the galaxy NGC 6744. The properties of these transients are consistent with those of Type II outbursts of Be X-ray binaries, but further data will be required to confirm their nature.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>We observed the candidate dual quasar J2122−0026 with speckle interferometric imaging at the Gemini-North Observatory. Results of our one-hour high resolution ‘Alopeke imaging observation agree with and confirm Hubble Space Telescope imaging of the pair separated at ∼0.″5. These observations show that sub-arcsec dual quasar candidates as faint as <jats:italic>r</jats:italic> ∼ 19 can be observed and detected using speckle imaging at Gemini.</jats:p> <jats:p> “Do not go where the path may lead, go instead where there is no path and leave a trail.”</jats:p> <jats:p>Ralph Waldo Emerson</jats:p>

<jats:title>Abstract</jats:title> <jats:p>Asteroid Terrestrial-impact Last Alert System (ATLAS) observations of Centaur (2060) 95P/Chiron show a brightening in the apparent magnitude not due rotational light curves or phase effects. This onset or enhancement of cometary activity started after 2021 February 8 UT and continued in later observations from 2021 June 18 UT onward. Recent ATLAS observations and deeper follow-up imaging obtained using the Las Cumbres Observatory 1.0 m robotic telescope network find no confirmed signature of coma or tail-like features.</jats:p>

<jats:title>Abstract</jats:title> <jats:p> <jats:italic>BVRI</jats:italic> polarization measurements of 14 selected young stars with circumstellar dust disks are presented. The interstellar polarization in the direction of these stars is not significant. The observed polarization data and its wavelength-dependence indicate that it is intrinsic, due to scattering by circumstellar, asymmetric dusty disks/envelopes.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>Ages, metallicities, and Galactic orbit parameters are considered for those stars with Henry Draper catalog designations that have been discovered to host planetary systems. There are quite a few such stars with above-solar metallicity and ages up to 4 Gyr older than the Sun. Some planet-hosting stars have Galactic orbits that take them within 4 kpc of the Galactic Center, while a substantial fraction attain displacements from the Galactic mid-plane consistent with the thick disk.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>From imaging observations of [Fe <jats:sc>ii</jats:sc>] emission in Herbig–Haro objects, I find a lower limit to the zero-extinction [Fe <jats:sc>ii</jats:sc>] 1.26 <jats:italic>μ</jats:italic>m/1.64 <jats:italic>μ</jats:italic>m intensity ratio of 2.6 and argue that this lower limit must be close to the true zero-extinction intensity ratio. My extinction determinations using this zero-extinction value yields results on well-studied HH objects consistent with results from other ionic-line spectra, whereas using nearly all theoretical values of [Fe <jats:sc>ii</jats:sc>] 1.26 <jats:italic>μ</jats:italic>m/1.64 <jats:italic>μ</jats:italic>m in the literature gives rise to unphysical results.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>The NASA TESS mission has provided the community with a plethora of new exoplanet host stars. These bright, nearby stars have been examined in detail in a number of studies and it has been determined that nearly one-half of the solar-like stars are binary. Two recent papers which examined 700 TESS exoplanet hosts have provided stellar properties for the stars, both single and binary. Herein, we provide a quantitative look at some properties of the stars, particularly searching for differences between the single versus binary (primary) host stars. We also compare the properties of the binary (primary) host stars themselves.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>As the Canadian Hydrogen Intensity Mapping Experiment (CHIME) has become the leading instrument for detecting Fast Radio Bursts (FRBs), CHIME/FRB Outriggers will use very-long-baseline interferometry (VLBI) to localize FRBs with milliarcsecond precision. The CHIME site uses a passive hydrogen maser frequency standard in order to minimize localization errors due to clock delay. However, not all outrigger stations will have access to a maser. This report presents techniques used to evaluate clocks for use at outrigger sites without a maser. More importantly, the resulting algorithm provides calibration methods for clocks that do not initially meet the stability requirements for VLBI, thus allowing CHIME/FRB Outriggers to remain true to the goal of having milliarcsecond precision.</jats:p>