Catálogo de publicaciones - revistas

<jats:title>Abstract</jats:title> <jats:p>Photometric <jats:italic>B</jats:italic>, <jats:italic>V</jats:italic>, <jats:italic>R</jats:italic>, and H<jats:italic>α</jats:italic> observations of the young open cluster M29 have been used to search for emission-line stars. Four stars with prominent H<jats:italic>α</jats:italic> emission are identified. One of these may be a Herbig AeBe star that shows significant variation in emission strength during the four-month observing interval.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>We present the results of MASTER Global Robotic Net optical observations of the region within the LIGO/Virgo S200219ac error-box, triggered during the O3 run. We observed 1124 square degrees inside the 3<jats:italic>σ</jats:italic> error box during a half month. We present the identified optical transients found during this study, which are not related to gravitational waves, and briefly discuss the MASTER observation strategy.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>The formation of Supermassive black holes (SMBHs) early in the universe challenges our understanding of black holes formation, since they appear to be well-established by several hundred millions of years after the big bang. Therefore, theories including direct-collapse black holes and times of super-Eddington accretion are utilized to explain the phenomenon. Quasars can be studied to help explain the growth of these SMBHs using the quasar luminosity function (QLF). The function used here to model the QLF is a four parametered function, the tapered power law. With further calculations, this data shows that periods of super-Eddington accretion are likely happening, and that the seed mass for these SMBHs ranges from about 10<jats:sup>2</jats:sup> to 10<jats:sup>5</jats:sup> <jats:italic>M</jats:italic> <jats:sub>⊙</jats:sub>.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>The dominant radioactive energy source powering SN Ia light curves is expected to switch from the decay of <jats:sup>56</jats:sup>Co to <jats:sup>57</jats:sup>Co at very late epochs. We use archival Hubble Space Telescope images of SN1992A obtained more than 900 days after explosion to constrain its cobalt isotopic abundance ratio and compare it to the well-studied event SN2011fe. We confirm the <jats:sup>57</jats:sup>Co/<jats:sup>56</jats:sup>Co ratio for SN2011fe of 0.026 ± 0.004 found by Shappee et al., consistent with a “double degenerate” progenitor scenario. For SN1992A, we find a ratio of 0.034 ± 0.010, but the large uncertainty does not allow us to differentiate between progenitor models.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>Gravitational waves (GWs) in general relativity are assumed to contain only tensorial polarization states, with generic metric theories of gravity also allowing for vector- and scalar-polarized GWs. Assuming an association between the gravitational-wave and electromagnetic transients GW190521 and ZTF19abanrhr, we find a preference for tensorial GWs with a log<jats:sub>10</jats:sub> Bayes factor of 21.6 (with respect to vector-polarized GWs) and 38.4 (with respect to scalar-polarized GWs).</jats:p>

<jats:title>Abstract</jats:title> <jats:p>We present MASTER observations from inspecting the large error-box associated with LIGO/Virgo G270590, and our observational strategy. MASTER observed 6292 square degrees inside the 3<jats:italic>σ</jats:italic> error box. We present new optical sources detected during this inspection.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>We present the results of MASTER Global Robotic Net optical observations of the LIGO GW170104 error-box during the LIGO/Virgo O2 run. We observed 3421 square degrees inside 3<jats:italic>σ</jats:italic> error-field. Dozens of optical transients unrelated to gravitational waves were discovered as the result of MASTER observation strategy, that we presented, including short very bright MASTER optical transients J133017.28+780951.8.</jats:p>