A5066901395- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Geophysics and Gravity Measurements
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Inertial Sensor and Navigation
- Adaptive optics and wavefront sensing
- History and Developments in Astronomy
- Scientific Research and Discoveries
- Breast Lesions and Carcinomas
- Radio Astronomy Observations and Technology
- CCD and CMOS Imaging Sensors
- Head and Neck Cancer Studies
- Oral and Maxillofacial Pathology
Instituto de Astrofísica de Canarias
2021-2024
Universidad de La Laguna
2021-2024
Institute for Research in Fundamental Sciences
2016-2024
University of Southampton
2023
University of Birjand
2016-2017
The Royal Free Hospital
2014
University College London
2014
The Euclid ERO showcase Euclid's capabilities in advance of its main mission by targeting 17 astronomical objects, including galaxy clusters, nearby galaxies, globular and star-forming regions. A total 24 hours observing time was allocated the early months operation, scientific community engaged through an public data release. We describe development pipeline to create visually compelling images while simultaneously meeting demands within launch leveraging a pragmatic data-driven strategy....
As the largest radio telescope in world, Square Kilometre Array (SKA) will lead next generation of astronomy. The feats engineering required to construct array be matched only by techniques developed exploit rich scientific value data. To drive forward development efficient and accurate analysis methods, we are designing a series data challenges that provide community with high-quality datasets for testing evaluating new techniques. In this paper present description results from first such...
Abstract NGC 5128 (Cen A) is the nearest giant elliptical galaxy and one of brightest extragalactic radio sources in sky, boasting a prominent dust lane jets emanating from its nuclear supermassive black hole. In this paper, we construct star formation history (SFH) two small fields halo 5128: northeastern field (Field 1) at projected distance ∼18.8 kpc center, southern 2) ∼9.9 center. Our method based on identifying long-period variable (LPV) stars that trace their sibling stellar...
NGC 147 and 185 are two of the most massive satellites Andromeda galaxy (M 31). Close together in sky, similar mass morphological type dE, they possess different amounts interstellar gas tidal distortion. The question therefore is, how do their histories compare? Here we present first reconstruction star formation using long-period variable stars. These represent final phase evolution low- intermediate-mass stars at asymptotic giant branch, when luminosity is related to birth mass. Combining...
We have examined the star formation history (SFH) of Andromeda VII (And VII), brightest and most massive dwarf spheroidal (dSph) satellite galaxy (M 31). Although M 31 is surrounded by several dSph companions with old stellar populations low metallicity, it has a metal-rich halo an age 6$-$8 Gyr. This indicates that any evolutionary association between its system frail. Therefore, question whether And (a high-metallicity located $\sim$220 kpc from 31), can be associated 31's young, halo....
We present a photometric study of the resolved stellar populations in And IX, closest satellite to M31, metal-poor and low-mass dwarf spheroidal galaxy. estimate distance modulus $24.56_{-0.15}^{+0.05}$ mag based on tip red giant branch (TRGB). By probing variability asymptotic stars (AGB), we star formation history IX. identified 50 long period variables (LPVs) IX using Isaac Newton Telescope (INT) two filters, Sloan $i'$ Harris $V$. In this study, selected LPVs within half-light radii with...
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The population of nearby dwarf galaxies in the Local Group constitutes a complete galactic environment, perfect suited for studying connection between stellar populations and galaxy evolution. In this study, we are conducting an optical monitoring survey majority Group, with Isaac Newton Telescope (INT), to identify long period variable stars (LPVs). These at end points their evolution therefore luminosity can be directly translated into birth masses; enables us reconstruct star formation...
Background: We evaluated the concordance between peri-areolar blue dye and peri-incisional radiotracer injections for axillary sentinel node mapping of patients with history previous breast lesion excisional biopsy. Methods: 80 biopsy lesions were included. All received two 99mTc-antimony sulfide colloid in both ends incision line an intradermal fashion. 2 mL patient V was injection to all area index quadrant after induction anesthesia. or hot nodes harvested as lymph nodes.Results: At least...
We conducted an optical monitoring survey of the Sagittarius dwarf irregular galaxy (SagDIG) during period June 2016 -- October 2017, using 2.5-m Isaac Newton Telescope (INT) at La Palama. Our goal was to identify Long Period Variable stars (LPVs), namely asymptotic giant branch (AGBs) and red supergiant (RSGs), obtain Star Formation History (SFH) isolated, metal-poor SagDIG. For our purpose, we used a method that relies on evaluating relation between luminosity birth mass these most evolved...
Abstract Dwarf galaxies in the Local Group (LG) represent a distinct as well diverse family of tracers earliest phases galaxy assembly and processing resulting from galactic harrassment. Their stellar populations can be resolved used probes evolution their host galaxy. In this regard, we present first reconstruction star formation history (SFH) them using most evolved AGB stars that are long period variable (LPV). LPV trace young ∼ 30 Myr to old oldest globular clusters. For nearby,...
Abstract An optical monitoring survey in nearby dwarf galaxies was carried out with the 2.5 m Isaac Newton Telescope. Fifty-five and four isolated globular clusters Local Group were observed Wide Field Camera. The main aims of this are to identify most evolved asymptotic giant branch (AGB) stars red supergiants at end-point their evolution based on pulsational instability, use distribution over luminosity reconstruct star formation history, quantify dust production mass loss from modeling...
Abstract An optical monitoring survey in the nearby dwarf galaxies was carried out with 2.5 m Isaac Newton Telescope. 55 and four isolated globular clusters Local Group were observed Wide Field Camera. The main aims of this are to identify most evolved asymptotic giant branch stars red supergiants at endpoint their evolution based on pulsational instability, use distribution over luminosity reconstruct star-formation history (SFH), quantify dust production mass loss from modeling...
We conducted an extensive study of the spheroidal dwarf satellite galaxies around Andromeda galaxy to produce catalog LPV stars. The optical monitoring project consists 55 and four globular clusters that are members Local Group. have made observations these using WFC mounted on 2.5 m INT in nine different periods, both i-band filter Sloan V-band Harris. aim select AGB stars with brightness variations larger than 0.2 mag investigate evolutionary processes galaxies. resulting Andromeda's...
We conducted an extensive study of the spheroidal dwarf satellite galaxies around Andromeda galaxy to produce catalog LPV stars. The optical monitoring project consists 55 and four globular clusters that are members Local Group. have made observations these using WFC mounted on 2.5 m INT in nine different periods, both i-band filter Sloan V -band Harris. aim select AGB stars with brightness variations larger than 0.2 mag investigate evolutionary processes galaxies. resulting Andromeda’s...
is poised to make significant advances in the study of nearby galaxies Local Universe. Here we present a first look at six observed for Nearby Galaxy Showcase as part Early Release Observations acquired between August and November 2023. These targets, three dwarf (Holmberg\,II, IC\,10, NGC\,6822) spirals (IC\,342, NGC\,2403, NGC\,6744), range distance from about 0.5\,Mpc 8.8\,Mpc. We assess surface brightness depths stacked images, confirm previous estimates 100\,arcsec$^2$ regions Visible...
NGC 5128 (Cen A) is the nearest giant elliptical galaxy and one of brightest extragalactic radio sources in sky, boasting a prominent dust lane jets emanating from its nuclear supermassive black hole. In this paper, we construct star formation history (SFH) two small fields halo 5128: northeastern field (Field 1) at projected distance $\sim 18.8$ kpc center, southern 2) 9.9$ center. Our method based on identifying long period variable (LPV) stars that trace their sibling stellar population...
Abstract Calibration of pixel values is a fundamental step for accurate measurements in astronomical imaging. In jargon this known as estimating zero-point magnitude. Here, we introduce newly added script GNU Astronomy Utilities (Gnuastro) version 0.20 the magnitude estimation, named: astscript-zero-point . The offers numerous features, such flexibility to use either image(s) or catalog reference data set. Additionally, steps are parallelized enhance efficiency big data. Thanks Gnuastro’s...
Abstract Stars are the main ingredients of galaxies, and sites creation most chemical elements in our universe. The knowledge that we gain from studying nearby resolved stellar populations assists directly ability to measure properties distant galaxies. overall objective this project is study galaxy formation evolution a complete environment dwarf galaxies Local Group, by using same methods for all them. For purpose, used INT conduct monitoring survey majority Local-Group order identify...
Abstract Amongst the dwarf galaxies in Local Group, isolated irregular one, IC 10 is one of most interesting galaxies, with strong star forming activity and highest density Wolf-Rayet stars. Undergoing a starburst phase, having numerous HII regions being bright all wavebands, makes it an exquisite galaxy to study internal external processes that continue affect 14 Gyr since Big Bang. In this study, we present new deep precise optical monitoring survey using Isaac Newton Telescope (INT) wide...
Local Group (LG), the nearest and most complete galactic environment, provides valuable information on formation evolution of Universe. Studying galaxies different sizes, morphologies, ages can provide this information. For purpose, we chose And\,IX dSph galaxy, which is one observational targets Isaac Newton Telescope (INT) survey. A total 50 long-period variables (LPVs) were found in two filters, Sloan $i'$ Harris $V$ at a half-light radius 2.5 arcmin. The And\,IX's star history (SFH) was...
We present a photometric study of the resolved stellar populations in And IX, closest satellite to M31, metal-poor and low-mass dwarf spheroidal galaxy. estimate distance modulus $24.56_{-0.15}^{+0.05}$ mag based on tip red giant branch (TRGB). By probing variability asymptotic stars (AGB), we star formation history IX. identified 50 long period variables (LPVs) IX using Isaac Newton Telescope (INT) two filters, Sloan $i'$ Harris $V$. In this study, selected LPVs within half-light radii with...
Calibration of pixel values is a fundamental step for accurate measurements in astronomical imaging. In jargon this known as estimating zero point magnitude. Here, we introduce newly added script GNU Astronomy Utilities (Gnuastro) version 0.20 the magnitude estimation, named: astscript-zeropoint. The offers numerous features, such flexibility to use either image(s) or catalog reference dataset. Additionally, steps are parallelized enhance efficiency big data. Thanks Gnuastro's minimal...