A5046809371- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Photocathodes and Microchannel Plates
- Semiconductor Lasers and Optical Devices
- Advancements in PLL and VCO Technologies
- Cosmology and Gravitation Theories
- Adaptive optics and wavefront sensing
Stockholm University
2015-2023
AlbaNova
2015-2023
University of Vienna
2014
Low- and intermediate mass galaxies are widely discussed as cause of reionization at redshift $z\sim10-6$. However, observational proof that leaking ionizing radiation (Lyman continuum; LyC) is a currently ongoing challenge the list LyC emitting candidates still short. Tololo 1247-232 among those very few with recently reported leakage. We performed resolution ultraviolet (UV) spectroscopy Cosmic Origins Spectrograph (COS) onboard Hubble Space Telescope confirm emerging from 1247-232....
Context . Stellar feedback strongly affects the interstellar medium (ISM) of galaxies. in first galaxies likely plays a major role enabling escape LyC photons, which contribute to re-ionization Universe. Nearby starburst serve as local analogues allowing for spatially resolved assessment processes these Aims .We aim characterize effects from star clusters high-redshift analogue ESO 338-IG04 on ISM and compare results with properties most massive clusters. Methods We used high quality...
We have used the capability of MUSE instrument to explore impact stellar feedback at large scales in Haro 11, a galaxy under extreme starburst condition and one first galaxies where Lyman continuum (LyC) has been detected. Using Ha, [OIII] [OI] emission lines from deep observations, we constructed sequence velocity-dependent maps Ha emission, state ionised gas tracer fast shocks. These allowed us investigate ionisation structure 50 kms^2 bins over velocity range -400 350 kms. The 11 is...
ABSTRACT Star formation is a clustered process that regulates the structure and evolution of galaxies. We investigate this in dwarf galaxy Haro 11, forming stars three knots (A, B, C). The exquisite resolution HST imaging allows us to resolve starburst into tens bright star clusters. derive masses between 105 $10^7\, \rm M_{\odot }$ ages younger than 20 Myr, using photometric modelling. observe has propagated from knot C (the oldest) through A (in between) towards B youngest). use...
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...
Abstract Understanding the escape of ionizing (Lyman continuum) photons from galaxies is vital for determining how contributed to reionization in early universe. While directly detecting Lyman continuum high-redshift impossible due intergalactic medium, low-redshift principle offer this possibility but require observations space. The first local galaxy which was found Haro 11, a luminous blue compact at z = 0.02, where with FUSE satellite revealed an fraction 3.3%. However, aperture covers...
ABSTRACT We use high quality VLT/MUSE data to study the kinematics and ionized gas properties of Haro 11, a well-known starburst merger system closest confirmed Lyman continuum leaking galaxy. present results from integrated line maps, maps in three velocity bins comprising blueshifted, systemic, redshifted emission. The kinematic analysis reveals complex velocities resulting interplay virial motions momentum feedback. Star formation happens intensively compact knots (knots A, B, C), but...
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 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 kinematics of galaxies provide valuable insights in their physics and assembly history. Kinematics are governed not only by the gravitational potential, but also merger events stellar feedback processes such as winds supernova explosions. Aims. We aim at identifying what governs a sample SDSS selected nearby starburst galaxies, obtaining spatially resolved measurements gas kinematics. obtain near-infrared integral field K-band spectroscopy with VLT/SINFONI 15 compact galaxies. derive...
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...
Abstract The origin of the morphology-density relation is still an open question in galaxy evolution. It most likely driven by combination efficient star formation highest peaks mass distribution at high- z and transformation environmental processes later times as galaxies fall into more massive halos. To gain additional insights about these we study kinematics, structural properties Abell 2163 a very (~4×10 15 M ⊙ , Holz & Perlmutter 2012) merging cluster = 0.2. We use high resolution...
The stellar content of young massive star clusters emit large amounts Lyman continuum photons and inject momentum into the inter medium (ISM) by strong winds most stars in cluster. When explode as supernovae, mechanical energy are injected ISM. A detailed study ISM around these cluster provides insights on effect feedback. We present high quality integral field spectroscopy taken with VLT/MUSE two starburst galaxies: ESO 338-IG04 Haro 11. Both galaxies contain a significant number super...
Abstract The stellar content of young massive star clusters emit large amounts Lyman continuum photons and inject momentum into the inter medium (ISM) by strong winds most stars in cluster. When explode as supernovae, mechanical energy are injected ISM. A detailed study ISM around these cluster provides insights on effect feedback. We present high quality integral field spectroscopy taken with VLT/MUSE two starburst galaxies: ESO 338-IG04 Haro 11. Both galaxies contain a significant number...
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...
The kinematics of galaxies provide valuable insights in their physics and assembly history. Kinematics are governed not only by the gravitational potential, but also merger events stellar feedback processes such as winds supernova explosions. Aims. We aim at identifying what governs a sample SDSS selected nearby starburst galaxies, obtaining spatially resolved measurements gas kinematics. obtain near-infrared integral field K-band spectroscopy with VLT/SINFONI 15 compact galaxies. derive...