K. M. Menten
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View article: Oxygen Isotopes Reveal Low-mass Star Dominance in the Small Magellanic Cloud
Oxygen Isotopes Reveal Low-mass Star Dominance in the Small Magellanic Cloud Open
Oxygen isotope abundances and their ratios are fingerprints of stellar evolution, and therefore provide a powerful tool in tracing the enrichment history of galaxies. However, their behavior in low-metallicity dwarf galaxies remains largel…
View article: Investigating the nature of the protoplanetary nebula OH 231.8+4.2
Investigating the nature of the protoplanetary nebula OH 231.8+4.2 Open
Aims. The protoplanetary nebula OH 231.8+4.2, also known as the Rotten Egg or Calabash nebula, is seen in the direction of the open cluster M 46. While an association between the nebula and the cluster has been suggested in the past, it wa…
View article: Re-exploring Molecular Complexity with ALMA: Insights into chemical differentiation from the molecular composition of hot cores in Sgr B2(N2)
Re-exploring Molecular Complexity with ALMA: Insights into chemical differentiation from the molecular composition of hot cores in Sgr B2(N2) Open
Context . Hot molecular cores correspond to the phase of star formation during which many molecules, in particular complex organic molecules (COMs), thermally desorb from the surface of dust grains. Sophisticated kinetic models of interste…
View article: SOFIA FIFI-LS spectroscopy of DR21 Main: Energetics of the spatially resolved outflow from a high-mass protostar
SOFIA FIFI-LS spectroscopy of DR21 Main: Energetics of the spatially resolved outflow from a high-mass protostar Open
Context . Massive star formation is associated with energetic processes that may influence the physics and chemistry of parental molecular clouds and impact galaxy evolution. The high-mass protostar DR21 Main in Cygnus X possesses one of t…
View article: The Expanding 3 kpc Arms Are Neither Expanding nor Spiral Arms but X1 Orbits Driven by the Galactic Bar
The Expanding 3 kpc Arms Are Neither Expanding nor Spiral Arms but X1 Orbits Driven by the Galactic Bar Open
Near the center of our Milky Way is a bar-like structure and the so-called Expanding 3 kpc arms. We currently have limited knowledge of this important region, since we are about 8.2 kpc from the center and cannot directly observe it at opt…
View article: SCOTCH − III: Complete search for Hypercompact H <scp>ii</scp> regions in the fourth quadrant
SCOTCH − III: Complete search for Hypercompact H <span>ii</span> regions in the fourth quadrant Open
We present high-frequency (18–24 GHz) radio continuum observations towards 335 methanol masers, excellent signposts for young, embedded high-mass protostars. These complete the search for hypercompact H ii (HC H ii) regions towards young h…
View article: Shock-induced HCNH<sup>+</sup> abundance enhancement in the heart of the starburst galaxy NGC 253 unveiled by ALCHEMI
Shock-induced HCNH<sup>+</sup> abundance enhancement in the heart of the starburst galaxy NGC 253 unveiled by ALCHEMI Open
Context. Understanding the chemistry of molecular clouds is pivotal to elucidate star formation and galaxy evolution. As one of the important molecular ions, HCNH + plays an important role in this chemistry. Yet, its behavior and significa…
View article: The Expanding 3 kpc Arms Are Neither Expanding nor Spiral Arms but X1 Orbits Driven by the Galactic Bar
The Expanding 3 kpc Arms Are Neither Expanding nor Spiral Arms but X1 Orbits Driven by the Galactic Bar Open
Near the center of our Milky Way is a bar-like structure and the so-called Expanding 3-kpc arms. We currently have limited knowledge of this important region, since we are about 8.2 kpc from the center and cannot directly observe it at opt…
View article: ATLASGAL-selected high-mass clumps in the inner Galaxy
ATLASGAL-selected high-mass clumps in the inner Galaxy Open
Context . High-mass stellar embryos are embedded in warm envelopes that provide mass reservoirs for the accretion process onto final stars. Feedback from star formation activities in return impacts the properties of the envelopes, offering…
View article: Molecular inventory of the environment of a young eruptive star
Molecular inventory of the environment of a young eruptive star Open
Context . Studying accretion-driven episodic outbursts in young stellar objects (YSOs) is crucial for understanding the later stages of star and planet formation. FU Orionis-type objects (briefly, FUors) represent a small but rather centra…
View article: ATLASGAL-selected high-mass clumps in the inner Galaxy: XI. Morphology and kinematics of warm inner envelopes
ATLASGAL-selected high-mass clumps in the inner Galaxy: XI. Morphology and kinematics of warm inner envelopes Open
(Abridged) Massive stellar embryos are embedded in warm envelopes that provide mass reservoirs for the accretion process onto final stars. Feedback from star formation activities in return impacts the properties of the envelopes, offering …
View article: ALESS-JWST: Joint (Sub)kiloparsec JWST and ALMA Imaging of <i>z</i> ~ 3 Submillimeter Galaxies Reveals Heavily Obscured Bulge Formation Events
ALESS-JWST: Joint (Sub)kiloparsec JWST and ALMA Imaging of <i>z</i> ~ 3 Submillimeter Galaxies Reveals Heavily Obscured Bulge Formation Events Open
We present JWST NIRCam imaging targeting 13 z ~ 3 infrared-luminous ( L IR ∼ 5 × 10 12 L ⊙ ) galaxies from the ALESS survey with uniquely deep, high-resolution (0 08–0 16) Atacama Large Millimeter/submillimeter Array 870 μ m im…
View article: The Cygnus Allscale Survey of Chemistry and Dynamical Environments: CASCADE. IV. Unveiling the hidden structures in DR18
The Cygnus Allscale Survey of Chemistry and Dynamical Environments: CASCADE. IV. Unveiling the hidden structures in DR18 Open
The Cygnus-X complex is a massive, nearby (1.4 kpc) star-forming region with several OB associations. As part of the Cygnus Allscale Survey of Chemistry and Dynamical Environments (CASCADE) program, we carried out 3.6 millimeter (mm) conti…
View article: A first glimpse at the MeerKAT DEEP2 field at <i>S</i>-band
A first glimpse at the MeerKAT DEEP2 field at <i>S</i>-band Open
We present the first wide-field extragalactic continuum catalogue with the MeerKAT S-band (2.5 GHz), of the radio-selected DEEP2 field. The combined image over the S1 (1.96–2.84 GHz) and S4 (2.62–3.50 GHz) sub-bands has an angular resoluti…
View article: The kinematics of massive high-redshift dusty star-forming galaxies
The kinematics of massive high-redshift dusty star-forming galaxies Open
We present a new method for modelling the kinematics of galaxies from interferometric observations by performing the optimization of the kinematic model parameters directly in visibility space instead of the conventional approach of fittin…
View article: Kinematic Analysis of z = 4.3 Galaxies in the SPT2349–56 Protocluster Core
Kinematic Analysis of z = 4.3 Galaxies in the SPT2349–56 Protocluster Core Open
SPT2349−56 is a protocluster discovered in the 2500 deg 2 South Pole Telescope (SPT) survey. In this paper, we study the kinematics of the galaxies found in the core of SPT2349−56 using high-resolution (1.55 kpc spatial resolution at z = 4…
View article: Constraining the Excitation of Molecular Gas in Two Quasar-starburst Systems at z ∼ 6
Constraining the Excitation of Molecular Gas in Two Quasar-starburst Systems at z ∼ 6 Open
We present NOrthern Extended Millimeter Array observations of CO(8–7), (9–8), and (10–9) lines, as well as the underlying continuum for two far-infrared luminous quasars: SDSS J2054-0005 at z = 6.0389 and SDSS J0129-0035 at z = 5.7788. Bot…
View article: Time evolution of o-H$_2$D$^+$, N$_2$D$^+$, and N$_2$H$^+$ during the high-mass star formation process
Time evolution of o-H$_2$D$^+$, N$_2$D$^+$, and N$_2$H$^+$ during the high-mass star formation process Open
Deuterium fractionation is a well-established evolutionary tracer in low-mass star formation, but its applicability to the high-mass regime remains an open question. The abundances and ratios of deuterated species have often been proposed …
View article: Revisiting rotationally excited CH at radio wavelengths: A case study towards W51
Revisiting rotationally excited CH at radio wavelengths: A case study towards W51 Open
Context. Ever since they were first detected in the interstellar medium, the radio wavelength (3.3 GHz) hyperfine-structure splitting transitions in the rotational ground state of CH were observed to show anomalous excitation. Astonishingl…
View article: Revisiting rotationally excited CH at radio wavelengths: A case study towards W51
Revisiting rotationally excited CH at radio wavelengths: A case study towards W51 Open
Ever since they were first detected in the interstellar medium, the radio wavelength (3.3 GHz) hyperfine-structure splitting transitions in the rotational ground state of CH have been observed to show anomalous excitation. Astonishingly, t…
View article: Constraining the excitation of molecular gas in Two Quasar-Starburst Systems at $z \sim 6$
Constraining the excitation of molecular gas in Two Quasar-Starburst Systems at $z \sim 6$ Open
We present NOrthern Extended Millimeter Array observations of CO(8-7), (9-8), and (10-9) lines, as well as the underlying continuum for two far-infrared luminous quasars: SDSS J2054-0005 at $\rm z=6.0389$ and SDSS J0129-0035 at $\rm z=5.77…
View article: NH<sub>3</sub> (1,1) hyperfine intensity anomalies in infall sources
NH<sub>3</sub> (1,1) hyperfine intensity anomalies in infall sources Open
Identifying infall motions is crucial for our understanding of accretion processes in regions of star formation. The NH 3 (1,1) hyperfine intensity anomaly (HIA) has been proposed to be a readily usable tracer for such infall motions in st…
View article: Nitrogen Abundance Distribution in the Inner Milky Way
Nitrogen Abundance Distribution in the Inner Milky Way Open
We combine a new Galactic plane survey of hydrogen radio recombination lines (RRLs) with far-infrared surveys of ionized nitrogen, N + , to determine nitrogen abundance across Galactic radius. RRLs were observed with the NASA Deep Space Ne…
View article: NH3 (1,1) hyperfine intensity anomalies in infall sources
NH3 (1,1) hyperfine intensity anomalies in infall sources Open
Identifying infall motions is crucial for our understanding of accretion processes in regions of star formation. The NH3 (1,1) hyperfine intensity anomaly (HIA) has been proposed to be a readily usable tracer for such infall motions in sta…
View article: Effects of stellar feedback on cores in STARFORGE
Effects of stellar feedback on cores in STARFORGE Open
Stars form in dense cores within molecular clouds, and newly formed stars influence their natal environments. How stellar feedback impacts core properties and evolution has been the subject of extensive investigation. We performed a hierar…
View article: Mapping and characterizing magnetic fields in the Rho Ophiuchus-A molecular cloud with SOFIA/HAWC+
Mapping and characterizing magnetic fields in the Rho Ophiuchus-A molecular cloud with SOFIA/HAWC+ Open
Context. Together with gravity, turbulence, and stellar feedback, magnetic fields (B-fields) are thought to play a critical role in the evolution of molecular clouds and star formation processes. The polarization of thermal dust emission i…
View article: A multi-wavelength study of Galactic H II regions with extended emission
A multi-wavelength study of Galactic H II regions with extended emission Open
Context . H II regions are the signposts of massive ( M ≥ 8 M ⊙ ) star-forming sites in our Galaxy. It has been observed that the ionizing photon rate inferred from the radio continuum emission of H II regions is significantly lower (~90%)…
View article: ALMA-IMF. XIV. Free–Free Templates Derived from H41α and Ionized Gas Content in 15 Massive Protoclusters
ALMA-IMF. XIV. Free–Free Templates Derived from H41α and Ionized Gas Content in 15 Massive Protoclusters Open
We use the H41 α recombination line to create templates of the millimeter free–free emission in the ALMA-IMF continuum maps, which allows us to separate it from dust emission. This method complements spectral-index information and extrapol…
View article: Understanding the multi-wavelength thermal dust polarisation from the Orion molecular cloud in light of the radiative torque paradigm
Understanding the multi-wavelength thermal dust polarisation from the Orion molecular cloud in light of the radiative torque paradigm Open
Dust grains play a key role in various astrophysical processes and serve as indicators of interstellar medium structures, density, and mass. Understanding their physical properties and chemical composition is a crucial goal in astrophysics…