A5015547149- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Galaxies: Formation, Evolution, Phenomena
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Atmospheric Ozone and Climate
- Molecular Spectroscopy and Structure
- Spectroscopy and Laser Applications
- Adaptive optics and wavefront sensing
- Astrophysical Phenomena and Observations
- Scientific Research and Discoveries
- Space Exploration and Technology
- Solar and Space Plasma Dynamics
- Advanced Combustion Engine Technologies
- Geophysics and Gravity Measurements
- Calibration and Measurement Techniques
- History and Developments in Astronomy
- Geomagnetism and Paleomagnetism Studies
- Underwater Vehicles and Communication Systems
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Molecular Physics
- Astrophysics and Cosmic Phenomena
- Advanced Chemical Physics Studies
University of Vienna
2015-2024
Instituto Politécnico da Guarda
2023
North Atlantic Treaty Organization
2023
Özyeğin University
2023
North Carolina State University
2023
Hospital Garcia de Orta
2022-2023
Polytechnic Institute of Viana do Castelo
2022
FH Campus Wien
2016-2022
Administração Regional de Saúde de Lisboa e Vale do Tejo
2022
Hospitais da Universidade de Coimbra
2022
We present here the Calar Alto Legacy Integral Field Area (CALIFA) survey, which has been designed to provide a first step in this direction.We summarize survey goals and design, including sample selection observational strategy.We also showcase data taken during observing runs (June/July 2010) outline reduction pipeline, quality control schemes general characteristics of reduced data. This is obtaining spatially resolved spectroscopic information diameter selected $\sim600$ galaxies Local...
In this paper we investigate the level of star formation activity within nearby molecular clouds. We employ a uniform set infrared extinction maps to provide accurate assessments cloud mass and structure compare these with inventories young stellar objects present evidence indicating that both yield rate can vary considerably in local clouds, independent their size. find surface density such clouds appears be important controlling factors. particular, (SFR) is linearly proportional (M_{0.8})...
Context: Stars form in the cold dense cores of interstellar molecular clouds and detailed knowledge spectrum masses such is clearly a key for understanding origin IMF. To date, observations have presented somewhat contradictory evidence relating to this issue. Aims: In paper we propose derive mass function complete sample single cloud employing robust method that uses extinction background starlight measure core enables reliable extension measurements lower than previously possible. Methods:...
We present UBVRI photometry of 44 Type Ia supernovae (SNe Ia) observed from 1997 to 2001 as part a continuing monitoring campaign at the Fred Lawrence Whipple Observatory Harvard-Smithsonian Center for Astrophysics. The data set comprises 2190 observations and is largest homogeneously reduced sample SNe date, nearly doubling number well-observed, nearby with published multicolor CCD light curves. large U-band unique addition, important connections high redshift. decline rate SN curves...
In this paper we investigate scaling relations between star formation rates and molecular gas masses for both local Galactic clouds a sample of external galaxies. We specifically consider the measurements dense, as well total, masses. argue that there is fundamental empirical relation directly connects process with operating globally within Specifically, total rate in cloud or galaxy linearly proportional to mass dense galaxy. This simple relation, first documented previous studies, holds...
Galaxies, which often contain ionised gas, sometimes also exhibit a so-called low-ionisation nuclear emission line region (LINER). For 30 years this was attributed to central mass-accreting supermassive black hole (AGN) of low luminosity, making LINER galaxies the largest AGN-sub-population, dominating in numbers over higher luminosity Seyfert and quasars. This, however, poses serious problem. While inferred energy balance is plausible, many LINERs clearly do not any other independent...
We present the results on study of global and local M-Z relation based first data available from CALIFA survey (150 galaxies). This provides integral field spectroscopy complete optical extent each galaxy (up to 2-3 effective radii), with enough resolution separate individual HII regions and/or aggregations. Nearly $\sim$3000 have been detected. The spectra cover wavelength range between [OII]3727 [SII]6731, a sufficient signal-to-noise derive oxygen abundance star-formation rate associated...
This paper characterizes the radial structure of stellar population properties galaxies in nearby universe, based on 300 from CALIFA survey. The sample covers a wide range Hubble types, and galaxy mass. We apply spectral synthesis techniques to recover mass surface density, extinction, light mass-weighted ages, metallicity, for each spatial resolution element our target galaxies. To study mean trends with overall properties, individual profiles are stacked seven bins morphology. confirm that...
We present the first public data release of CALIFA survey. It consists science-grade optical datacubes for 100 eventually 600 nearby (0.005<z<0.03) galaxies, obtained with integral-field spectrograph PMAS/PPak mounted on 3.5m telescope at Calar Alto observatory. The galaxies in DR1 already cover a wide range properties color-magnitude space, morphological type, stellar mass, and gas ionization conditions. This offers potential to tackle variety open questions galaxy evolution using spatially...
Abstract We present a uniform catalog of accurate distances to local molecular clouds informed by the Gaia DR2 data release. Our methodology builds on that Schlafly et al. First, we infer distance and extinction stars along sightlines toward using optical near-infrared photometry. When available, incorporate knowledge stellar obtained from parallax measurements. model these per-star distance–extinction estimates as being caused dust screen with 2D morphology derived Planck at an unknown...
This paper describes the third public data release (DR3) of Calar Alto Legacy Integral Field Area (CALIFA) survey. Science-grade quality for 667 galaxies are made public, including 200 second (DR2). Data were obtained with integral-field spectrograph PMAS/PPak mounted on 3.5 m telescope at Observatory. Three different spectral setups available: i) a low-resolution V500 setup covering wavelength range 3745–7500 Å (4240–7140 unvignetted) resolution 6.0 (FWHM) 646 galaxies, ii)...
This paper describes the Second Public Data Release (DR2) of Calar Alto Legacy Integral Field Area (CALIFA) survey. The data for 200 objects are made public, including 100 galaxies First (DR1). were obtained with integral-field spectrograph PMAS/PPak mounted on 3.5 m telescope at observatory. Two different spectral setups available each galaxy, (i) a low-resolution V500 setup covering wavelength range 3745-7500 \AA\ resolution 6.0 (FWHM), and (ii) medium-resolution V1200 3650-4840 2.3...
Abridged. Are all filaments bundles of fibers? To address this question, we have investigated the gas organization within paradigmatic Integral Shape Filament (ISF). We combined two new ALMA Cycle 3 mosaics with previous IRAM 30m observations to produce a high-dynamic range N$_2$H$^+$(1-0) emission map ISF tracing its high-density material and velocity structure down scales 0.009 pc. From analysis kinematics, identify total 55 dense fibers in central region ISF. Independently their location,...
Accurate distances to local molecular clouds are critical for understanding the star and planet formation process, yet distance measurements often obtained inhomogeneously on a cloud-by-cloud basis. We have recently developed method that combines stellar photometric data with Gaia DR2 parallax in Bayesian framework infer of nearby dust typical accuracy ∼5%. After refining technique target lower latitudes incorporating deep optical from DECam southern Galactic plane, we derived catalog...
In the last 15 years different ground-based spectroscopic surveys have been started (and completed) with general aim of delivering stellar parameters and elemental abundances for large samples Galactic stars, complementing Gaia astrometry. Among those surveys, Gaia-ESO Public Spectroscopic Survey (GES), only one performed on a 8m class telescope, was designed to target 100,000 stars using FLAMES ESO VLT (both Giraffe UVES spectrographs), covering all Milky Way populations, special focus open...
Context. The Gaia-ESO Public Spectroscopic Survey is an ambitious project designed to obtain astrophysical parameters and elemental abundances for 100 000 stars, including large representative samples of the stellar populations in Galaxy, a well-defined sample 60 (plus 20 archive) open clusters. We provide internally consistent results calibrated on benchmark stars star clusters, extending across very wide range ages. This provides legacy data set intrinsic value, equally wide-ranging...
We use the results of a new multiepoch, multiwavelength, near-infrared census Trapezium cluster in Orion to construct and analyze structure its infrared (K-band) luminosity function. Specifically, we employ an improved set model functions derive this cluster's underlying initial mass function (IMF) across entire range from OB stars substellar objects down near deuterium-burning limit. IMF for that rises with decreasing mass, having Salpeter-like slope until ~0.6 M☉ where flattens forms broad...
We present sensitive, high angular resolution molecular line observations of C18O and N2H+ toward the dark globule B68. directly compare these data with near-infrared extinction measurements Alves, Lada, & Lada to derive first evidence for depletion N2H+, by inference N2, in a prestellar cloud. also find widespread throughout centrally condensed core B68 Specifically, we emission peak shell partially surrounding dust extinction. Moreover, peaks inside much larger hole has smaller zone,...
We generalize the technique of Lada et al. ([CITE]) to map dust column density through a molecular cloud (Nice) an optimized multi-band (Nicer) that can be applied any survey clouds. present first application ~ subset Two Micron All Sky Survey (2MASS) data and show when compared Nice, Nicer (i) achieves same extinction peak values, (ii) improves noise variance by factor 2 (iii) is able reach measurements as low , better than or equivalent classical optical star count techniques below...
In this paper we present the results of a systematic investigation an entire population predominately starless dust cores within single molecular cloud, Pipe Nebula. Analysis extinction data shows to be dense objects characterized by narrow range density with median value n(H2) = 7 × 103. The nonthermal velocity dispersions measured in emission lines are found subsonic for large majority and show no correlation core mass (or size). Thermal pressure is dominate source internal gas support...
We present an overview of data available for the Ophiuchus and Perseus molecular clouds from Phase I COMPLETE Survey Star-Forming Regions. This survey provides a range complementary to Spitzer Legacy Program "From Molecular Cores Planet Forming Disks." includes following: extinction maps derived Two Micron All Sky (2MASS) near-infrared using NICER algorithm; temperature IRAS 60 100 μm emission; H atomic gas; 12CO 13CO submillimeter continuum images emission dust in dense cores. Not...
We report the results of a sensitive near-infrared JHKL imaging survey Trapezium cluster in Orion. use colors to obtain census infrared excess stars cluster. Of (391) brighter than 12th magnitude K and L bands, 80% ± 7% are found exhibit detectable on J-H, K-L color-color diagram. Examination subsample 285 these with published spectral types yields slightly higher fraction 85%. find that 97% optical proplyds diagram indicating most likely origin observed excesses is from circumstellar disks....