K. L. J. Rygl
A5025979770- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Molecular Spectroscopy and Structure
- Radio Astronomy Observations and Technology
- Pulsars and Gravitational Waves Research
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Astro and Planetary Science
- Atmospheric Ozone and Climate
- Gamma-ray bursts and supernovae
- Advanced Combustion Engine Technologies
- Atomic and Molecular Physics
- Superconducting and THz Device Technology
- Particle Accelerators and Free-Electron Lasers
- Solar and Space Plasma Dynamics
- Spectroscopy and Laser Applications
- Scientific Research and Discoveries
- Geophysics and Gravity Measurements
- Space Exploration and Technology
- Particle Detector Development and Performance
- Mechanics and Biomechanics Studies
- Calibration and Measurement Techniques
Istituto di Radioastronomia di Bologna
2016-2025
Osservatorio astronomico di Bologna
2015-2024
Max Planck Institute for Radio Astronomy
2008-2019
National Time Service Center
2019
Chinese Academy of Sciences
2019
Center for Astrophysics Harvard & Smithsonian
2019
Institute for Space Astrophysics and Planetology
2012-2016
National Institute for Astrophysics
2010-2016
European Space Research and Technology Centre
2014-2016
Max Planck Society
2008-2015
Over 100 trigonometric parallaxes and proper motions for masers associated with young, high-mass stars have been measured the Bar Spiral Structure Legacy Survey, a Very Long Baseline Array key science project, European VLBI Network, Japanese Exploration of Radio Astrometry project. These measurements provide strong evidence existence spiral arms in Milky Way, accurately locating many arm segments yielding pitch angles ranging from about 7° to 20°. The widths increase distance Galactic...
We present first results from the Herschel Gould Belt survey for B211/L1495 region in Taurus molecular cloud. Thanks to their high sensitivity and dynamic range, images reveal structure of dense, star-forming filament B211 with unprecedented detail, along presence striations perpendicular generally oriented magnetic field direction as traced by optical polarization vectors. Based on column density dust temperature maps derived data, we find that radial profile approaches a power-law behavior...
Whether the Cygnus X complex consists of one physically connected region star formation or multiple independent regions projected close together on sky has been debated for decades. The main reason this puzzling scenario is lack trustworthy distance measurements. We aim to understand structure and dynamics star-forming toward by accurate proper motion To measure trigonometric parallaxes, we observed 6.7 GHz methanol 22 water masers with European VLBI Network Very Long Baseline Array....
(Abridged) We present the first public release of high-quality data products (DR1) from Hi-GAL, {\em Herschel} infrared Galactic Plane Survey. Hi-GAL is keystone a suite continuum surveys near-IR to radio, and covers five wavebands at 70, 160, 250, 350 500 micron, encompassing peak spectral energy distribution cold dust for 8 < T 50K. This inner Milky Way in longitude range 68{\deg} > l -70{\deg} |b|<1{\deg} latitude strip. Photometric maps have been produced with ROMAGAL pipeline, that...
A key parameter to the description of all star formation processes is density structure gas. In this Letter, we make use probability distribution functions (PDFs) Herschel column maps Orion B, Aquila, and Polaris, obtained with Gould Belt survey (HGBS). We aim understand which physical influence PDF shape, signatures. The PDFs B (Aquila) show a lognormal for low densities until AV ∼ 3 (6), power-law tail high densities, consistent ρ∝r−2 profile equivalent spherical distribution. broadened by...
We compile and analyze ~200 trigonometric parallaxes proper motions of molecular masers associated with very young high-mass stars. These measurements strongly suggest that the Milky Way is a four-arm spiral. Fitting log-periodic spirals to locations masers, allows us significantly expand our view structure Way. present an updated model for its spiral incorporate it into previously published parallax-based distance-estimation program sources arms. Modeling three-dimensional space yields...
Hi-GAL is a large-scale survey of the Galactic plane, performed with Herschel in five infrared continuum bands between 70 and 500 $\mu$m. We present band-merged catalogue spatially matched sources their properties derived from fits to spectral energy distributions (SEDs) heliocentric distances, based on photometric catalogs presented Molinari et al. (2016a), covering portion plane $-71.0^{\circ}< \ell < 67.0^{\circ}$. The contains 100922 regular SED, 24584 which show $\mu$m counterpart are...
In order to characterise the cloud structures responsible for formation of high-mass stars, we present Herschel observations DR21 environment. Maps column density and dust temperature unveil structure ridge several connected filaments. The has densities higher than 1023 cm-2 over a region 2.3 pc2. It shows substructured profiles branches into two major filaments in north. masses range between 130 1400 M⊙, whereas mass is 15 000 M⊙. accretion these onto ridge, suggested by previous molecular...
Emission from the 6.7 GHz methanol maser transition is very strong, relatively stable, has small internal motions, and observed toward numerous massive star-forming regions in Galaxy. Our goal to perform high-precision astrometry using this obtain accurate distances their host regions. Eight strong masers were during five epochs of VLBI observations with European Network between 2006 June, 2008 March. We report trigonometric parallaxes for regions, accuracies as good $\sim22 \mathrmμ$as....
Abstract Astrometric Very Long Baseline Interferometry (VLBI) observations of maser sources in the Milky Way are used to map spiral structure our galaxy and determine fundamental parameters such as rotation velocity (Θ 0 ) curve distance Galactic center ( R ). Here, we present an update on first results, implementing a recent change knowledge about Solar motion. It seems unavoidable that IAU recommended values for Θ need substantial revision. In particular combination 8.5 kpc 220 km s –1 can...
Herschel has shown that filamentary structures are ubiquitous in star-forming regions, particular nearby molecular clouds associated with Gould's Belt. High dynamic range far-infrared imaging of the Musca cloud SPIRE and PACS reveals at least two types structures: (1) main ~10-pc scale high column-density linear filament; (2) low striations close proximity to filament. In addition, we find features intermediate column densities (hair-like strands) appear physically connected We present an...
We present Herschel survey maps of the L 1641 molecular clouds in Orion A. extracted both filaments and dense cores region. identified which sources are proto- or pre-stellar, studied their association with filaments. find that although most (71%) pre-stellar located on there, is still a significant fraction not associated such structures. these two populations (on off filaments) have distinctly different mass distributions. The distribution found to peak at 4 M☉ drives shape core function...
We present the first Herschel PACS and SPIRE photometric observations in a portion of outer Galaxy ($216.5^{\circ} \lesssim \ell 225.5^{\circ}$ $-2^{\circ} b 0^{\circ}$) as part Hi-GAL survey. The maps between 70 500 $\mu$m, derived column density temperature maps, compact source catalog are presented. NANTEN CO(1-0) line used to derive cloud kinematics distances, so that we can estimate distance-dependent physical parameters sources (cores clumps) having reliable spectral energy...
We present the $360^\circ$ catalogue of physical properties Hi-GAL compact sources, detected between 70 and 500 $\mu$m. This release not only completes analogous previously produced by collaboration for $-71^\circ \lesssim \ell 67^\circ$, but also meaningfully improves it thanks to a new set heliocentric distances, 120808 in total. About third 150223 entries are located newly added portion Galactic plane. A first classification based on detection at $\mu$m as signature ongoing star-forming...
We report far-IR Herschel observations obtained between 70 $\mu$m and 500 of two star-forming dusty condensations, B1-bS B1-bN, in the B1 region Perseus cloud. In Western part cloud, is only source detected all 6 PACS SPIRE photometric bands without being visible Spitzer map at 24 $\mu$m. B1-bN clearly 100 250 have fitted spectral energy distributions these sources to derive their physical properties, find that a simple greybody model fails reproduce observed SEDs. At least two-component...
The filament IRDC G035.39--00.33 in the W48 molecular complex is one of darkest infrared clouds observed by \textit{Spitzer}. It has been PACS (70 and 160\,$\micron$) SPIRE (250, 350, 500\,$\micron$) cameras \textit{Herschel} Space Observatory as part cloud framework HOBYS key programme. observations reveal a sample 28 compact sources (deconvolved FWHM sizes $<$0.3 pc) complete down to $\sim$$5 \msun$ its surroundings. Among them, 13 are massive dense cores with masses $>$$20 \msun$....
The whole of the Taurus region (a total area 52 sq. deg.) has been observed by Herschel SPIRE and PACS instruments at wavelengths 70, 160, 250, 350 500 {\mu}m as part Gould Belt Survey. In this paper we present first results from that includes Barnard 18 L1536 clouds. A new source-finding routine, Cardiff Source-finding AlgoRithm (CSAR), is introduced, which loosely based on CLUMPFIND, but also generates a structure tree, or dendrogram, can be used to interpret hierarchical clump in complex...
We present Herschel observations from the Gould Belt Survey and SCUBA-2 science verification JCMT of B1 clump in Perseus molecular cloud. determined dust emissivity index using four different techniques to combine PACS+SPIRE data at 160–500 μm with 450 850 μm. Of our techniques, we found that most robust method was filtering out large-scale emission bands match spatial scales recovered by reduction pipeline. Using this method, find β ≈ 2 toward filament region moderately dense material lower...
Utilizing multi-wavelength dust emission maps acquired with $Herschel$, we reconstruct local volume density and temperature profiles for the prestellar cores B68 L1689B using inverse-Abel transform based technique. We present intrinsic radial of starless directly from continuum disentangling effect variations along line sight which was previously limited to radiative transfer calculations. The reconstructed show a significant drop in core center, flat inner part, rising outward trend until...
Aims. Fundamental to any theory of high-mass star formation are gravity and turbulence. Their relative importance, which probably changes during cloud evolution, is not known. By investigating the spatial density structure star-forming complex NGC 6334 we aim disentangle contributions turbulence gravity.
Observations of molecular clouds reveal a complex structure, with gas and dust often arranged in filamentary rather than spherical geometries. The associations pre- proto- stellar cores the filaments suggest direct link process star formation. Any study properties such requires representative samples from different enviroments so an unbiased detection method. We developed approach using Hessian matrix surface-brightness distribution to identify determine their physical morphological...
We conducted VLA C-configuration observations to measure positions and luminosities of Galactic Class II 6.7 GHz methanol masers their associated ultra-compact H regions. The spectral resolution was 3.90625 kHz the continuum sensitivity reached 45 \uJypb. mapped 372 with peak flux densities more than 2 Jy selected from literature, 367 them were detected. Absolute have nominal uncertainties 0.3 arcsec. In this first paper on data analysis, we present three catalogs, gives information...
To constrain models of high-mass star formation, the Herschel/HOBYS KP aims at discovering massive dense cores (MDCs) able to host analogs low-mass prestellar cores, which have been searched for over past decade. We here focus on NGC6334, one best-studied HOBYS molecular cloud complexes. used Herschel PACS and SPIRE 70-500mu images NGC6334 complex complemented with (sub)millimeter mid-infrared data. built a complete procedure extract ~0.1 pc getsources software, simultaneously measures their...
Aims. Ionization feedback should impact the probability distribution function (PDF) of column density cold dust around ionized gas. We aim to quantify this effect and discuss its potential link core initial mass (CMF/IMF).