A5034070640- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Calibration and Measurement Techniques
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- CCD and CMOS Imaging Sensors
- Impact of Light on Environment and Health
- Astrophysical Phenomena and Observations
- Radio Astronomy Observations and Technology
- Planetary Science and Exploration
- Satellite Image Processing and Photogrammetry
- Adaptive optics and wavefront sensing
- Cosmology and Gravitation Theories
- Photocathodes and Microchannel Plates
- Astronomical and nuclear sciences
- Gamma-ray bursts and supernovae
- Scientific Research and Discoveries
Ludwig-Maximilians-Universität München
2024
Pennsylvania State University
2024
Stockholm University
2022-2023
AlbaNova
2022-2023
The geometry of the neutral gas in and around galaxies is a key regulator escape ionizing photons. We present first statistical study aimed at linking ionized distributions to Lyman continuum (LyC) fraction ( f esc LyC ) sample 22 confirmed leakers non-leakers z ≈ 0.35 using Keck Cosmic Web Imager (Keck/KCWI) Low Resolution Spectrograph 2 (HET/LRS2). Our integral field unit data enable detection low-ionization gas, as traced by Mg II , [O ], extending beyond stellar for seven ten objects,...
ABSTRACT Around 400 Myr after the big bang, ultraviolet emission from star-forming galaxies reionized Universe. Ionizing radiation (Lyman continuum, LyC) is absorbed by cold neutral hydrogen gas (H i) within galaxies, hindering escape of LyC photons. Since H i reservoir emitters has never been mapped, major uncertainties remain on how photons and ionize intergalactic medium. We have directly imaged in nearby reionization-era analogue galaxy Haro 11 with 21 cm line to identify mechanism...
Context: Outflows from low-mass star-forming galaxies are a fundamental ingredient for models of galaxy evolution and cosmology. Aims: The onset kpc-scale ionised filaments in the halo metal-poor compact dwarf SBS 0335-052E was previously not linked to an outflow. We here we investigate whether these provide evidence Methods: obtained new VLT/MUSE WFM deep NRAO/VLA B-configuration 21cm data galaxy. MUSE morphology, kinematics, emission line ratios H$\beta$/H$\alpha$...
Using new high-resolution data of CO (2-1), H-alpha and H-beta obtained with the Northern Extended Millimeter Array (NOEMA) Multi-Unit Spectroscopic Explorer (MUSE) at Very Large Telescope, we have performed a Toomre-Q disc stability analysis studied star formation, gas depletion times other environmental parameters on sub-kpc scales within z~0 galaxy SDSS J125013.84+073444.5 (LARS 8). The hosts massive, clumpy is proto-typical analogue main-sequence galaxies z~1-2. We show that massive...
Abstract We present Ly α imaging of 45 low-redshift star-forming galaxies observed with the Hubble Space Telescope. The have been selected to moderate high star formation rates (SFRs) using far-ultraviolet (FUV) luminosity and H equivalent width criteria, but no constraints on luminosity. employ a pixel stellar continuum fitting code obtain accurate continuum-subtracted , β maps. find that is less concentrated than FUV optical line emission in almost all significant emission. global...
Abstract The Ly α emission line is one of the main observables galaxies at high redshift, but its output depends strongly on neutral gas distribution and kinematics around star-forming regions where UV photons are produced. We present observations 21 cm H i comparable scales with goal to qualitatively investigate how interstellar medium (ISM) properties impact transfer in galaxies. have observed highest possible angular resolution (≈3″ beam) Very Large Array two local from Lyman Alpha...
The geometry of the neutral gas in and around galaxies is a key regulator escape ionizing photons. We present first statistical study aiming at linking ionized distributions to Lyman continuum (LyC) fraction (fesc(LyC)) sample 22 confirmed LyC leakers non-leakers z~0.35 using Keck Cosmic Web Imager (Keck/KCWI) Low Resolution Spectrograph 2 (HET/LRS2). Our integral field unit data enable detection low-ionization gas, as traced by Mg II, [O II], extending beyond stellar for 7 10 objects,...
Gas kinematics affect the radiative transfer and escape of hydrogen Lyman-$\alpha$ (Ly$\alpha$) emission from galaxies. We investigate this interplay empirically by relating ionised gas 42 galaxies in extended Ly$\alpha$ Reference Sample with their fractions, $f_\rm{esc}$, equivalent widths, $\rm{EW}_\rm{Ly\alpha}$, luminosities, $L_\rm{Ly\alpha}$. To aim we use PMAS integral-field spectroscopic observations Balmer-$\alpha$ line. calculate shearing velocities, $v_\rm{shear}$, intrinsic...
Gas kinematics affect the radiative transfer and escape of hydrogen Lyman-alpha (Lyalpha ) emission from galaxies. We investigate this interplay empirically by relating ionised gas 42 galaxies in extended Lyalpha Reference Sample (eLARS) with their fractions, $f_ esc Ly alpha $, equivalent widths, $ EW luminosities, $L_ $. To aim we use PMAS integral-field spectroscopic observations Balmer-alpha line. Our sample contains 18 rotating discs, 13 perturbed rotators, more complex kinematics. The...
One of the fundamental questions cosmology is origin and mechanism(s) responsible for reionization Universe beyond $z\sim6$. To address this question, many studies over past decade have focused on local ($z\sim0.3$) galaxies which leak ionizing radiation (Lyman continuum or LyC). However, line-of-sight effects data quality prohibited deeper insight into nature LyC escape. circumvent these limitations, we analyze stacks a consolidated sample {\it HST}/COS observations in 89 at $z\sim0.3$....
The Lyman-$\alpha$ (Lya) line of hydrogen is a well-known tracer galaxies at high-z. However, the connection between Lya observables and galaxy properties has not fully been established, limiting use to probe physics galaxies. Here, we derive global neutral gas (HI) nearby Lya-emitting assess impact HI on output We observed 21cm emission using VLA in D-array configuration (~55" resolution, ~38 kpc) for 37 star-forming with available imaging from Lyman Alpha Reference Samples (LARS eLARS)....
The Lyman-alpha ( line of hydrogen is a well-known tracer galaxies at high redshift. However, the connection between observables and galaxy properties has not been fully established, limiting use to probe physics galaxies. Here, we derive global neutral gas nearby assess impact on output We observed 21cm emission using Karl G. Jansky Very Large Array in D-array configuration (sim 55" resolution, $ for 37 star-forming with available Hubble Space Telescope (HST) imaging from Lyman Alpha...
Around 400 million years after the Big Bang, ultraviolet emission from star-forming galaxies reionized Universe. Ionizing radiation (Lyman Continuum, LyC) is absorbed by cold neutral hydrogen gas (HI) within galaxies, hindering escape of LyC photons. Since HI reservoir emitters has never been mapped, major uncertainties remain on how photons and ionize intergalactic medium. We have directly imaged in nearby reionization-era analog galaxy Haro 11 with 21cm line to identify mechanism enabling...
We present Ly $α$ imaging of 45 low redshift star-forming galaxies observed with the Hubble Space Telescope. The have been selected to moderate high star formation rates using far-ultraviolet (FUV) luminosity and \ha equivalent width criteria, but no constraints on luminosity. employ a pixel stellar continuum fitting code obtain accurate subtracted $α$, H $β$ maps. find that is less concentrated than FUV optical line emission in almost all significant emission. global measurements other...
Using new high-resolution data of CO (2-1), H-alpha and H-beta obtained with the Northern Extended Millimeter Array (NOEMA) Multi-Unit Spectroscopic Explorer (MUSE) at Very Large Telescope, we have performed a Toomre-Q disc stability analysis studied star formation, gas depletion times other environmental parameters on sub-kpc scales within z~0 galaxy SDSS J125013.84+073444.5 (LARS 8). The hosts massive, clumpy is proto-typical analogue main-sequence galaxies z~1-2. We show that massive...