Publications (30)
Jet-disturbed molecular gas near the Seyfert 2 nucleus in M51
Satoki Matsushita, Sebastien Muller, Jeremy Lim
Previous molecular gas observations at arcsecond-scale resolution of the Seyfert 2 galaxy M51 suggest the presence of a dense circumnuclear rotating disk, which may be the reservoi…
The Opacity of Nearby Galaxies from Counts of Background Galaxies: II. Limits of the Synthetic Field Method
Rosa A. Gonzalez, Laurent Loinard, Ronald J. Allen +1
Recently, we have developed and calibrated the Synthetic Field Method (SFM) to derive the total extinction through disk galaxies. The method is based on the number counts and color…
Joint Beamforming and Feature Detection for Enhanced Visualization of Spinal Bone Surfaces in Ultrasound Images
Saeed Mehdizadeh, Sebastien Muller, Gabriel Kiss +2
We propose a framework for extracting the bone surface from B-mode images employing the eigenspace minimum variance (ESMV) beamformer and a ridge detection method. We show that an…
Energizing Star Formation: The Cosmic Ray Ionization Rate in NGC 253 Derived From ALCHEMI Measurements of HO and SO
Jonathan Holdship, Jeffrey G. Mangum, Serena Viti +16
The cosmic ray ionization rate (CRIR) is a key parameter in understanding the physical and chemical processes in the interstellar medium. Cosmic rays are a significant source of en…
ALMACAL VI: Molecular gas mass density across cosmic time via a blind search for intervening molecular absorbers
Anne Klitsch, Celine Peroux, Martin A. Zwaan +12
We are just starting to understand the physical processes driving the dramatic change in cosmic star-formation rate between and the present day. A quantity directly linke…
5-12 pc resolution ALMA imaging of gas and dust in the obscured compact nucleus of IRAS 17578-0400
Chentao Yang, Susanne Aalto, Sabine König +7
We here present 0.02-0.04'' resolution ALMA observation of the compact obscured nucleus (CON) of IRAS17578-0400. A dusty torus within the nucleus, approximately 4 pc in radius, has…
Discovery of Hydrogen Radio Recombination Lines at z=0.89 towards PKS 1830-211
Kimberly L. Emig, Neeraj Gupta, Pedro Salas +14
We report the detection of stimulated hydrogen radio recombination line (RRL) emission from ionized gas in a galaxy using 580--1670 MHz observations from the MeerKAT Absor…
Total Opacity of Local Group Galaxies and Large Scale Structure behind the Galactic Bulge
Rosa A. Gonzalez, Benne Holwerda, Laurent Loinard +2
Recently, we have developed and calibrated the Synthetic Field Method to derive total extinction through disk galaxies. The method is based on the number counts and colors of dista…
Neural Network Constraints on the Cosmic-Ray Ionization Rate and Other Physical Conditions in NGC 253 with ALCHEMI Measurements of HCN and HNC
Erica Behrens, Jeffrey G. Mangum, Serena Viti +15
We use a neural network model and ALMA observations of HCN and HNC to constrain the physical conditions, most notably the cosmic-ray ionization rate (CRIR, zeta), in the Central Mo…
Molecular gas and dust in the highly magnified z = 2.8 galaxy behind the Bullet Cluster
Daniel Johansson, Cathy Horellou, Omar Lopez-Cruz +8
The gravitational magnification provided by massive galaxy clusters makes it possible to probe the physical conditions in distant galaxies that are of lower luminosity than those i…
Probing isotopic ratios at z = 0.89: molecular line absorption in front of the quasar PKS 1830-211
Sebastien Muller, Michel Guelin, Michael Dumke +2
With the Plateau de Bure interferometer, we have measured the C, N, O and S isotopic abundance ratios in the arm of a spiral galaxy with a redshift of 0.89. The galaxy is seen face…
Enhanced UV radiation and dense clumps in Mrk231's molecular outflow
Claudia Cicone, Roberto Maiolino, Susanne Aalto +2
We present interferometric observations of the CN(1-0) line emission in Mrk231 and combine them with previous observations of CO and other H gas tracers to study the physical p…
The ALCHEMI atlas: principal component analysis reveals starburst evolution in NGC 253
Nanase Harada, David S. Meier, Sergio MartÃn +24
Molecular lines are powerful diagnostics of the physical and chemical properties of the interstellar medium (ISM). These ISM properties, which affect future star formation, are exp…
A strong magnetic field in the jet base of a supermassive black hole
Ivan Marti-Vidal, Sebastien Muller, Wouter Vlemmings +2
Active galactic nuclei (AGN) host some of the most energetic phenomena in the Universe. AGN are thought to be powered by accretion of matter onto a rotating disk that surrounds a s…
Probing the mass loss history of the yellow hypergiant IRC+10420
Dinh-V-Trung, Sebastien Muller, Jeremy Lim +2
We have used the sub-millimeter array to image the molecular envelope around IRC+10420. Our observations reveal a large and clumpy expanding envelope around the star. The molecular…
Resolving the Bright HCN(1-0) Emission toward the Seyfert 2 Nucleus of M51: Shock Enhancement by Radio Jets and Weak Masing by Infrared Pumping?
Satoki Matsushita, Dinh-V-Trung, Frédéric Boone +3
We present high angular resolution observations of the HCN(1-0) emission (at ~1" or ~34 pc), together with CO J = 1-0, 2-1, and 3-2 observations, toward the Seyfert 2 nucleus of M5…
Strong Limit on a Variable Proton-to-Electron Mass Ratio from Molecules in the Distant Universe
Michael T. Murphy, Victor V. Flambaum, Sebastien Muller +1
The Standard Model of particle physics assumes that the so-called fundamental constants are universal and unchanging. Absorption lines arising in molecular clouds along quasar sigh…
SMA CO(J=6-5) and 435 micron interferometric imaging of the nuclear region of Arp 220
Satoki Matsushita, Daisuke Iono, Glen R. Petitpas +11
We have used the Submillimeter Array (SMA) to make the first interferometric observations (beam size ~1") of the 12CO J=6-5 line and 435 micron (690 GHz) continuum emission toward…
Starburst Energy Feedback Seen Through HCO/HOC Emission in NGC 253 from ALCHEMI
Nanase Harada, Sergio MartÃn, Jeffrey G. Mangum +19
Molecular abundances are sensitive to UV-photon flux and cosmic-ray ionization rate. In starburst environments, the effects of high-energy photons and particles are expected to be…
The ortho-to-para ratio of HCl: Quasi-classical trajectory calculations and new simulations in light of new observations
Romane Le Gal, Changjian Xie, Eric Herbst +3
Multi-hydrogenated species with proper symmetry properties can present different spin configurations, and thus exist under different spin symmetry forms, labeled as para and ortho…
New constraints on the values of the fundamental constants at a look-back time of 7.3 Gyr
Renzhi Su, Stephen J. Curran, Francoise Combes +4
The study of redshifted spectral lines can provide a measure of the fundamental constants over large look-back times. Current grand unified theories predict an evolution in these c…
SOFIA Far-infrared [O III] and [O I] Observations of Dense CO-knots in the Supernova Remnant Cassiopeia A: Multi-phase Ejecta
Jeonghee Rho, Sofia Wallstrom, Sebastien Muller +5
Dense, fast-moving ejecta knots in supernova remnants are prime sites for molecule and dust formation. We present SOFIA far-IR spectrometer FIFI-LS observations of CO-rich knots in…
Tracing Interstellar Heating: An ALCHEMI Measurement of the HCN Isomers in NGC 253
Erica Behrens, Jeffrey G. Mangum, Jonathan Holdship +17
We analyze HCN and HNC emission in the nearby starburst galaxy NGC 253 to investigate its effectiveness in tracing heating processes associated with star formation. This study uses…
Volume density structure of the NGC253 CMZ through ALCHEMI excitation analysis
Kunihiko Tanaka, Jeffrey G. Mangum, Serena Viti +21
We present a spatially-resolved excitation analysis for the central molecular zone (CMZ) of the starburst galaxy NGC 253 using the data from the ALMA Large program ALCHEMI, whereby…
High-Angular-Resolution and High-Sensitivity Science Enabled by Beamformed ALMA
Vincent Fish, Walter Alef, James Anderson +66
An international consortium is presently constructing a beamformer for the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile that will be available as a facility instrum…
Searching for dust in the intracluster medium from reddening of background galaxies
Sebastien Muller, Szu-Ying Wu, Bau-Ching Hsieh +4
We report a search for the presence of dust in the intra-cluster medium based on the study of statistical reddening of background galaxies. Armed with the Red Sequence Cluster surv…
HCN and HCO+ emission in the disk of M31
Nathalie Brouillet, Sebastien Muller, Fabrice Herpin +2
We report observations made with the IRAM 30m radiotelescope in the HCN(1-0) and HCO+(1-0) lines towards a sample of molecular complexes (GMCs) in the disk of the Andromeda galaxy…
SUNRISE: The rich molecular inventory of high-redshift dusty galaxies revealed by broadband spectral line surveys
Chentao Yang, Alain Omont, Sergio MartÃn +21
Understanding the nature of high- dusty galaxies requires a comprehensive view of their ISM and molecular complexity. However, the molecular ISM at high- is commonly studied…
Drastic changes in the molecular absorption at redshift z=0.89 toward the quasar PKS 1830-211
Sebastien Muller, Michel Guelin
A 12 year-long monitoring of the absorption caused by a z=0.89 spiral galaxy on the line of sight to the radio-loud gravitationally lensed quasar PKS 1830-211 reveals spectacular c…
HCO+ and HCN J=3-2 absorption toward the center of Centaurus A
Sebastien Muller, Dinh-V-Trung
We have investigated the presence of dense gas toward the radio source Cen A by looking at the absorption of the HCO+ and HCN (3-2) lines in front of the bright continuum source wi…