A5009431186- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Molecular Spectroscopy and Structure
- Galaxies: Formation, Evolution, Phenomena
- Astro and Planetary Science
- Atmospheric Ozone and Climate
- Advanced Combustion Engine Technologies
- Scientific Research and Discoveries
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Spectroscopy and Laser Applications
- Advanced Chemical Physics Studies
- Astrophysical Phenomena and Observations
- Superconducting and THz Device Technology
- Radio Frequency Integrated Circuit Design
- Non-Invasive Vital Sign Monitoring
- Astronomical Observations and Instrumentation
- Ionosphere and magnetosphere dynamics
- Geophysics and Gravity Measurements
- Phase Equilibria and Thermodynamics
- Emotion and Mood Recognition
- GNSS positioning and interference
- Geophysics and Sensor Technology
- Gamma-ray bursts and supernovae
- Particle Detector Development and Performance
Max Planck Institute for Radio Astronomy
2015-2025
Max Planck Society
2014-2019
The APEX Telescope Large Area Survey of the Galaxy (ATLASGAL) is an unbiased 870 μm submillimetre survey inner Galactic plane (|ℓ| < 60° with |b| 1|$_{.}^{\circ}$|5). It largest and most sensitive ground-based wavelength to date has provided a large systematic inventory all massive, dense clumps in (≥1000 M⊙ at heliocentric distance 20 kpc) includes representative samples earliest embedded stages high-mass star formation. Here, we present first detailed census properties (velocities,...
By matching infrared-selected, massive young stellar objects (MYSOs) and compact HII regions in the RMS survey to clumps found submillimetre ATLASGAL survey, we have identified ~1000 embedded stars between 280\degr < $\ell$ 350\degr 10degr 60\degr with |b|<1.5degr. Combined an existing sample of radio-selected methanol masers regions, result is a catalogue ~1700 within ~1300 located across inner Galaxy, containing three observationally distinct subsamples, methanol-maser, MYSO HII-region...
Using the 870 μm APEX Telescope large area survey of Galaxy, we have identified 577 submillimetre continuum sources with masers from methanol multibeam in region 280° < ℓ 20°; |b| 1|${^{\circ}_{.}}$|5. 94 per cent are associated dust emission. We estimate masses for ∼450 maser-associated and find that preferentially massive clumps. These clumps centrally condensed, envelope structures appear to be scale-free, mean maser position being offset peak column density by 0 ± 4 arcsec. Assuming a...
The ATLASGAL survey provides an ideal basis for detailed studies of large numbers massive star forming clumps covering the whole range evolutionary stages. Top100 is a sample selected from their infrared and radio properties to be representative sources are focus number follow-up that will presented in series papers. In present work we use dust continuum emission constrain physical this identify trends as function source evolution. We determine flux densities mid-infrared submm wavelength...
Context. The assumption of a gas-to-dust mass ratio γ is common approach to estimate the basic properties molecular clouds, such as total and column density hydrogen, from (sub)mm continuum observations dust. In Milky Way single value used at all galactocentric radii, independently observed metallicity gradients. Both models extragalactic suggest that this quantity increases for decreasing Z, typical outer regions in disks, where fewer heavy elements are available form dust grains.
ATLASGAL is a 870-mircon dust survey of 420 square degrees the inner Galactic plane and has been used to identify ~10 000 dense molecular clumps. Dedicated follow-up observations complementary surveys are characterise physical properties these clumps, map their distribution investigate evolutionary sequence for high-mass star formation. The analysis data ongoing: we present an up-to-date version catalogue. We have classified 5007 clumps into four stages (quiescent, protostellar, young...
With the GREAT receiver at Stratospheric Observatory for Infrared Astronomy (SOFIA), nine massive molecular clumps have been observed in ammonia $3_{2+}- 2_{2-}$ line 1.8~THz a search signatures of infall. The sources were selected from ATLASGAL submillimeter dust continuum survey our Galaxy. Clumps with high masses covering range evolutionary stages based on their infrared properties chosen. was detected all sources, leading to five new detections and one confirmation previous detection...
(Abridged) Aims: We aim to use the progressive heating of gas caused by feedback high-mass young stellar objects (YSOs) prove statistical validity most common schemes used define an evolutionary sequence for clumps, and characterise sensitivity different tracers this process. Methods: From spectroscopic follow-ups ATLASGAL TOP100 sample, we selected several multiplets CH3CN, CH3CCH, CH3OH emission lines derive compare physical properties in clumps along sequence. Our findings are compared...
We report the results of 870-$\mu$m continuum observations, using Large APEX Bolometer Camera (LABOCA), towards 77 class-II, 6.7-GHz methanol masers identified by Methanol Multibeam (MMB) survey to map thermal emission from cool dust these objects. These data complement a study 630 associated with compact dense clumps ATLASGAL survey. Compact is detected 70 sources, which implies dust-association rate 99% for full MMB catalogue. Evaluation derived and maser properties leads us conclude that...
The object W33 is a giant molecular cloud that contains star forming regions at various evolutionary stages from quiescent clumps to developed H ii regions. Since its are located the same distance and primary material of birth clouds probably similar, we conducted comparative chemical study trace footprint different phases evolution. We observed six in with Atacama Pathfinder Experiment (APEX) telescope 280 GHz Submillimeter Array (SMA) 230 GHz. detected 27 transitions 10 molecules APEX data...
The infrared dark clouds (IRDCs) G11.11$-$0.12 and G28.34$+$0.06 are two of the best-studied IRDCs in our Galaxy. These host clumps at different stages evolution, including a massive dense clump both that is even 70 100$\mu$m. Such seemingly quiescent have been speculated to harbor cores precursors high-mass stars clusters. We observed these "prestellar" regions 1mm with Submillimeter Array (SMA) aim characterizing nature such cores. show fragment into several low- within filamentary...
Abstract The Outer Galaxy High-Resolution Survey (OGHReS) covers 100 square degrees (180○ &lt; ℓ 280○) in the (2–1) transitions of three CO-isotopologues. We use spectra to refine velocities and physical properties 6 706 Hi-GAL clumps located OGHReS region. In a previous paper, we analysed 3 584 between = 250○ 280○. Here, cover further 122 250○) determine reliable for 2 781 these, finding good agreement with previously assigned (∼80 per cent within 5 km s−1). update 288 provide new...
We aim to directly determine the kinetic temperature and spatial density with formaldehyde for $\sim$100 brightest ATLASGAL-selected clumps at 870 $\mu$m representing various evolutionary stages of high-mass star formation. Ten transitions ($J$ = 3-2 4-3) ortho- para-H$_2$CO near 211, 218, 225, 291 GHz were observed APEX 12 m telescope. Using non-LTE models RADEX, we derive gas using measured p-H$_2$CO 3$_{21}$-2$_{20}$/3$_{03}$-2$_{02}$, 4$_{22}$-3$_{21}$/4$_{04}$-3$_{03}$,...
Context. The formation processes of massive stars are still unclear but a picture is emerging involving accretion disks and molecular outflows in what appears to be scaled-up version low-mass star formation. A census outflow activity towards star-forming clumps various evolutionary stages has the potential shed light on (MSF). Aims. We conducted an survey ATLASGAL using SEDIGISM data aimed obtain large sample exhibiting different stages. Methods. identify high-velocity wings 13CO lines...
APECS is the distributed control system of new Atacama Pathfinder EXperiment (APEX) telescope located on Llano de Chajnantor at an altitude 5107 m in desert northern Chile. based Large Millimeter Array (ALMA) software and employs a modern, object-oriented design using Common Object Request Broker Architecture (CORBA) as middleware. New generic device interfaces simplify adding instruments to system. The Python observer command scripting language allows many existing libraries facilitates...
The Cygnus X complex is covered by the Global View of Star Formation in Milky Way (GLOSTAR) survey, an unbiased radio-wavelength Galactic plane 4--8 GHz continuum radiation and several spectral lines. GLOSTAR survey observed 6.7~GHz transition methanol (CH$_3$OH), exclusive tracer high-mass young stellar objects. Using Very Large Array both B D configurations, we area Cygnus~X $7^{\rm o}\times3^{\rm o}$ size simultaneously line continuum, allowing cross-registration. We detected thirteen...
We have constructed the largest sample of dust-associated class II 6.7 GHz methanol masers yet obtained. New measurements from Methanol MultiBeam (MMB) Survey were combined with 870 $\mu$m APEX Telescope Large Area Galaxy (ATLASGAL) and 850 JCMT Plane (JPS). Together two previous studies we now identified host clumps for 958 across Galactic Plane, covering approximately 99% MMB catalogue increasing known by over 30%. investigate correlations between physical properties using distances...
The morphology of the Milky Way is still a matter debate. In order to shed light on uncertainties surrounding structure Galaxy, in this paper, we study imprint spiral arms distribution and properties its molecular gas. To do so, take full advantage SEDIGISM (Structure, Excitation, Dynamics Inner Galactic Interstellar Medium) survey that observed large area inner Galaxy 13 CO (2–1) line at an angular resolution 28′′. We analyse influences by considering features gas emission as whole across...
Filaments are a ubiquitous morphological feature of the molecular interstellar medium and identified as sites star formation. In recent years, more than 100 large-scale filaments (with length $>10$\,pc) have been observed in inner Milky Way. As they appear linked to Galactic dynamics, studying those structures represents an opportunity link kiloparsec-scale phenomena physics formation, which operates on much smaller scales. this letter, we use newly acquired Outer Galaxy High Resolution...
For a general understanding of the physics involved in star formation process, measurements physical parameters such as temperature and density are indispensable. The chemical properties dense clumps molecular clouds strongly affected by kinetic temperature. Therefore, this parameter is essential for better interstellar medium. Formaldehyde, molecule which traces entire gas, appears to be most reliable tracer directly measure gas temperature.We aim determine with spectral lines from...
We have used catalogues from several Galactic plane surveys and dedicated observations to investigate the relationship between various maser species star forming clumps, as identified by ATLASGAL survey. The transitions of interest are 6.7 & 12.2 GHz methanol masers, 22.2 water masers emitting in four ground-state hyperfine structure hydroxyl. find clump association rates for water, hydroxyl be 56, 39 82 per cent respectively, within longitude range 60{\deg} > $l$ -60{\deg}. differences...
ABSTRACT We have used data from the Outer Galaxy High-Resolution Survey (OGHReS) to refine velocities, distances, and physical properties of a large sample 3584 clumps detected in far-infrared/submillimetre emission Hi-GAL survey located ℓ = 250°–280° region Galactic plane. Using 12CO 13CO spectra, we determined reliable velocities 3412 (95 per cent sample). In comparison catalogue, find good agreement for 80 (within 5 km s−1). higher resolution sensitivity OGHReS has allowed us correct...
Context . The Lagoon Nebula (M8) is host to multiple regions with recent and ongoing massive star formation, due which it appears as one of the brightest H II in sky. M8-Main M8 East, two prominent have been studied detail over past few years, while large parts nebula its surroundings received little attention. These largely unexplored comprise a sample molecular clumps that are affected by presence O- B-type stars. Thus, exploring dynamics chemical composition these will improve our...