Jan Forbrich
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View article: Differential virial analysis: a new technique to determine the dynamical state of molecular clouds
Differential virial analysis: a new technique to determine the dynamical state of molecular clouds Open
Since molecular clouds form stars, at least some parts of them must be in a state of collapse. However, there is a long-standing debate as to whether that collapse is local, involving only a small fraction of the cloud mass, or global, wit…
View article: The Role of Pressure in the Structure and Stability of GMCs in the Andromeda Galaxy
The Role of Pressure in the Structure and Stability of GMCs in the Andromeda Galaxy Open
We revisit the role of pressure in the structure, stability, and confinement of Giant Molecular Clouds (GMCs) in light of recently published observations and analysis of the GMCs in the Andromeda galaxy (M31). That analysis showed that, in…
View article: The past, present and future of observations of externally irradiated disks
The past, present and future of observations of externally irradiated disks Open
Recent years have seen a surge of interest in the community studying the effect of ultraviolet radiation environment, predominantly set by OB stars, on protoplanetary disc evolution and planet formation. This is important because a signifi…
View article: The Proxima Centauri Campaign—First Constraints on Millimeter Flare Rates from ALMA
The Proxima Centauri Campaign—First Constraints on Millimeter Flare Rates from ALMA Open
Proxima Centauri (Cen) has been the subject of many flaring studies due to its proximity and potential to host habitable planets. The discovery of millimeter flares from this M dwarf with Atacama Large Millimeter/submillimeter Array (ALMA)…
View article: Characterizing the Multiple Protostellar System VLA 1623-2417 with JWST, ALMA, and VLA: Outflow Origins, Dust Growth, and an Unsettled Disk
Characterizing the Multiple Protostellar System VLA 1623-2417 with JWST, ALMA, and VLA: Outflow Origins, Dust Growth, and an Unsettled Disk Open
Utilizing the James Webb Space Telescope (JWST), the Atacama Large Millimeter/submillimeter Array (ALMA), and the Very Large Array (VLA), we present high angular resolution (0 06–0 42), multiwavelength (4 μ m–3 cm) observations…
View article: The past, present and future of observations of externally irradiated disks
The past, present and future of observations of externally irradiated disks Open
Recent years have seen a surge of interest in the community studying the effect of ultraviolet radiation environment, predominantly set by OB stars, on protoplanetary disc evolution and planet formation. This is important because a signifi…
View article: Multi-observatory Study of Young Stellar Energetic Flares (MORYSEF): No Evidence for Abnormally Strong Stellar Magnetic Fields after Powerful X-Ray Flares
Multi-observatory Study of Young Stellar Energetic Flares (MORYSEF): No Evidence for Abnormally Strong Stellar Magnetic Fields after Powerful X-Ray Flares Open
We explore the empirical power-law relationship between X-ray luminosity ( L X ) and total surface magnetic flux (Φ), established across solar magnetic elements, time- and disk-averaged emission from the Sun, older active stars, and pre-ma…
View article: Characterising the multiple protostellar system VLA 1623-2417 with JWST, ALMA and VLA: outflow origins, dust growth and an unsettled disk
Characterising the multiple protostellar system VLA 1623-2417 with JWST, ALMA and VLA: outflow origins, dust growth and an unsettled disk Open
Utilising JWST, ALMA and the VLA we present high angular resolution (0.06''- 0.42''), multi-wavelength (4 micron - 3cm) observations of the VLA 1623-2417 protostellar system to characterise the origin, morphology and, properties of the con…
View article: Differential virial analysis: a new technique to determine the dynamical state of molecular clouds
Differential virial analysis: a new technique to determine the dynamical state of molecular clouds Open
Since molecular clouds form stars, at least some parts of them must be in a state of collapse. However, there is a long-standing debate as to whether that collapse is local, involving only a small fraction of the cloud mass, or global, wit…
View article: Multi-Observatory Study of Young Stellar Energetic Flares (MORYSEF): No Evidence For Abnormally Strong Stellar Magnetic Fields After Powerful X-ray Flares
Multi-Observatory Study of Young Stellar Energetic Flares (MORYSEF): No Evidence For Abnormally Strong Stellar Magnetic Fields After Powerful X-ray Flares Open
We explore the empirical power-law relationship between X-ray luminosity (Lx) and total surface magnetic flux (Phi), established across solar magnetic elements, time- and disk-averaged emission from the Sun, older active stars, and pre-mai…
View article: Cloud-scale elemental abundance variations and the CO-to-dust-mass conversion factor in M31
Cloud-scale elemental abundance variations and the CO-to-dust-mass conversion factor in M31 Open
From a spectroscopic survey of candidate H II regions in the Andromeda galaxy (M31) with MMT/Hectospec, we have identified 294 H II regions using emission line ratios and calculated elemental abundances from strong-line diagnostics (values…
View article: Cloud-scale elemental abundance variations and the CO-to-dust-mass conversion factor in M31
Cloud-scale elemental abundance variations and the CO-to-dust-mass conversion factor in M31 Open
From a spectroscopic survey of candidate H ii regions in the Andromeda Galaxy (M31) with MMT/Hectospec, we have identified 294 H ii regions using emission line ratios and calculated elemental abundances from strong-line diagnostics (values…
View article: Multi-Observatory Research of Young Stellar Energetic Flares (MORYSEF): X-Ray-flare-related Phenomena and Multi-epoch Behavior
Multi-Observatory Research of Young Stellar Energetic Flares (MORYSEF): X-Ray-flare-related Phenomena and Multi-epoch Behavior Open
The most powerful stellar flares driven by magnetic energy occur during the early pre-main-sequence (PMS) phase. The Orion Nebula represents the nearest region populated by young stars, showing the greatest number of flares accessible to a…
View article: Multi-Observatory Research of Young Stellar Energetic Flares (MORYSEF): X-ray Flare Related Phenomena and Multi-epoch Behavior
Multi-Observatory Research of Young Stellar Energetic Flares (MORYSEF): X-ray Flare Related Phenomena and Multi-epoch Behavior Open
The most powerful stellar flares driven by magnetic energy occur during the early pre-main sequence (PMS) phase. The Orion Nebula represents the nearest region populated by young stars, showing the greatest number of flares accessible to a…
View article: Using 26Al to detect ongoing self-enrichment in young massive star clusters
Using 26Al to detect ongoing self-enrichment in young massive star clusters Open
Self-enrichment is one of the leading explanations for chemical anomalies in globular clusters. In this scenario, various candidate polluter stars have been proposed to eject gas with altered chemical composition during the self-enrichment…
View article: Using $^{26}$Al to detect ongoing self-enrichment in young massive star clusters
Using $^{26}$Al to detect ongoing self-enrichment in young massive star clusters Open
Self-enrichment is one of the leading explanations for chemical anomalies in globular clusters. In this scenario, various candidate polluter stars have been proposed to eject gas with altered chemical composition during the self-enrichment…
View article: The SKA Galactic Centre Survey -- A White Paper
The SKA Galactic Centre Survey -- A White Paper Open
With its extreme density of stars and stellar remnants, dense young massive clusters, high specific star formation rate, intense radiation field, high magnetic field strength, and properties of the interstellar medium that resemble those i…
View article: Emergence of high-mass stars in complex fiber networks (EMERGE)
Emergence of high-mass stars in complex fiber networks (EMERGE) Open
Context. Recent molecular surveys have revealed the rich gas organization of sonic-like filaments at small scales (so-called fibers) in all types of environments prior to the formation of low- and high-mass stars. These fibers form at the …
View article: The Molecular Clouds of M31
The Molecular Clouds of M31 Open
Deep interferometric observations of CO and dust continuum emission are obtained with the Submillimeter Array at 230 GHz to investigate the physical nature of the giant molecular cloud (GMC) population in the Andromeda galaxy (M31). We use…
View article: The Molecular Clouds of M31
The Molecular Clouds of M31 Open
Deep interferometric observations of CO and dust continuum emission are obtained with the Sub-Millimeter Array (SMA) at 230 GHz to investigate the physical nature of the giant molecular cloud (GMC) population in the Andromeda galaxy (M31).…
View article: Tracing dense gas in six resolved GMCs of the Andromeda Galaxy
Tracing dense gas in six resolved GMCs of the Andromeda Galaxy Open
We present dense-gas-tracing molecular observations of six resolved Giant Molecular Clouds (GMCs) in the Andromeda Galaxy (M31). Using the NOEMA interferometer, we observed the transitions of HCN(1–0), HCO+(1–0), and HNC(1–0), as well as 1…
View article: Tracing Dense Gas in Six Resolved GMCs of the Andromeda Galaxy
Tracing Dense Gas in Six Resolved GMCs of the Andromeda Galaxy Open
We present dense-gas--tracing molecular observations of six resolved Giant Molecular Clouds (GMCs) in the Andromeda Galaxy (M31). Using the NOEMA interferometer, we observed the transitions of HCN(1-0), HCO$^+$(1-0), and HNC(1-0), as well …
View article: HIGH-PRECISION RADIO and INFRARED ASTROMETRY of LSPM J1314+1320AB. II. TESTING PRE-MAIN-SEQUENCE MODELS at the LITHIUM DEPLETION BOUNDARY with DYNAMICAL MASSES
HIGH-PRECISION RADIO and INFRARED ASTROMETRY of LSPM J1314+1320AB. II. TESTING PRE-MAIN-SEQUENCE MODELS at the LITHIUM DEPLETION BOUNDARY with DYNAMICAL MASSES Open
We present novel tests of pre-main-sequence models based on individual dynamical masses for the M7 binary LSPM J1314+1320AB. Joint analysis of Keck adaptive optics astrometric monitoring along with Very Long Baseline Array radio data from …
View article: SKA Science Data Challenge 2: analysis and results
SKA Science Data Challenge 2: analysis and results Open
The Square Kilometre Array Observatory (SKAO) will explore the radio sky to new depths in order to conduct transformational science. SKAO data products made available to astronomers will be correspondingly large and complex, requiring the …
View article: A systematic survey of millimetre-wavelength flaring variability of young stellar objects in the Orion Nebula Cluster
A systematic survey of millimetre-wavelength flaring variability of young stellar objects in the Orion Nebula Cluster Open
High-energy processes are ubiquitous even in the earliest stages of protostellar evolution. Motivated by the results of our systematic search for intense centimetre radio flares in Young Stellar Objects (YSOs) and by rare findings of stron…
View article: VISIONS: The VISTA Star Formation Atlas -- I. Survey overview
VISIONS: The VISTA Star Formation Atlas -- I. Survey overview Open
VISIONS is an ESO public survey of five nearby (d < 500 pc) star-forming molecular cloud complexes that are canonically associated with the constellations of Chamaeleon, Corona Australis, Lupus, Ophiuchus, and Orion. The survey was carried…
View article: An Ionized Outflow in Orion-KL Source I?
An Ionized Outflow in Orion-KL Source I? Open
We present images at 6 and 14 GHz of Source I (SrcI) in the Kleinmann–Low Nebula in Orion. At higher frequencies, from 43 to 340 GHz, images of this source are dominated by thermal emission from dust in a 100 au diameter circumstellar disk…
View article: VISIONS: the VISTA Star Formation Atlas
VISIONS: the VISTA Star Formation Atlas Open
VISIONS is an ESO public survey of five nearby ( d < 500 pc) star-forming molecular cloud complexes that are canonically associated with the constellations of Chamaeleon, Corona Australis, Lupus, Ophiuchus, and Orion. The survey was carrie…
View article: An ionized outflow in Orion-KL source I?
An ionized outflow in Orion-KL source I? Open
We present images at 6 and 14 GHz of Source I in Orion-KL. At higher frequencies, from 43 to 340 GHz, images of this source are dominated by thermal emission from dust in a 100 AU diameter circumstellar disk, but at 6 and 14 GHz the emissi…
View article: The Mouse That Squeaked: A Small Flare from Proxima Cen Observed in the Millimeter, Optical, and Soft X-Ray with Chandra and ALMA
The Mouse That Squeaked: A Small Flare from Proxima Cen Observed in the Millimeter, Optical, and Soft X-Ray with Chandra and ALMA Open
We present millimeter, optical, and soft X-ray observations of a stellar flare with an energy squarely in the regime of typical X1 solar flares. The flare was observed from Proxima Cen on 2019 May 6 as part of a larger multi-wavelength fla…