A5030362672- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Experimental and Theoretical Physics Studies
- Paranormal Experiences and Beliefs
- Gamma-ray bursts and supernovae
- Acute Lymphoblastic Leukemia research
- Particle Accelerators and Free-Electron Lasers
- Hemoglobinopathies and Related Disorders
- Epigenetics and DNA Methylation
- Genetic Associations and Epidemiology
- Acute Myeloid Leukemia Research
- Mechanics and Biomechanics Studies
- Astro and Planetary Science
- Calibration and Measurement Techniques
- Space Science and Extraterrestrial Life
- Retinoids in leukemia and cellular processes
- Dark Matter and Cosmic Phenomena
- Astronomical Observations and Instrumentation
University of Helsinki
2023-2024
Institute of Cancer Research
2024
Helsinki Institute of Physics
2023-2024
Max Planck Institute for Astrophysics
2019-2023
University of Sussex
2018
Abstract We describe the first public data release of Dark Energy Survey, DES DR1, consisting reduced single-epoch images, co-added source catalogs, and associated products services assembled over 3 yr science operations. DR1 is based on optical/near-infrared imaging from 345 distinct nights (2013 August to 2016 February) by Camera mounted 4 m Blanco telescope at Cerro Tololo Inter-American Observatory in Chile. wide-area survey covering ∼5000 deg 2 southern Galactic cap five broad...
Abstract Observed low-mass galaxies with nuclear star clusters (NSCs) can host accreting massive black holes (MBH). We present simulations of dwarf ($M_{\mathrm{baryon}} \sim 0.6\hbox{--}2.4 \times 10^8 \rm \, M_\odot$) at solar mass resolution ($0.5\rm M_\odot < m_{\mathrm{gas}} 4 a multi-phase interstellar medium (ISM) and investigate the impact NSCs on MBH growth formation (SF). The griffin simulation model includes non-equilibrium low temperature cooling, chemistry effect H ii...
We present results on the star cluster properties from a series of high resolution smoothed particles hydrodynamics (SPH) simulations isolated dwarf galaxies as part GRIFFIN project. The at sub-parsec spatial and minimum particle mass 4 $\mathrm{M_\odot}$ incorporate non-equilibrium heating, cooling chemistry processes, realise individual massive stars. All follow feedback channels stars that include interstellar-radiation field, is variable in space time, radiation input by photo-ionisation...
ABSTRACT We present new griffin project hydrodynamical simulations that model the formation of galactic star cluster populations in low-metallicity (Z = 0.00021) dwarf galaxies, including radiation, supernova, and stellar wind feedback individual massive stars. In simulations, stars are sampled from initial mass function (IMF) down to hydrogen-burning limit 0.08 M⊙. Mass conservation is enforced within a radius 1 pc for find preferentially found clusters follow correlation set at birth...
ABSTRACT In this study of the ‘Resolving supermAssive Black hole Binaries galacTic hydrodynamical Simulations’ (RABBITS) series, we focus on hardening and coalescing process supermassive black (SMBH) binaries in galaxy mergers. For simulations including different formation processes (i.e. gas cooling, star formation, SMBH accretion, stellar, AGN feedback), systematically control effect stochastic eccentricity by fixing it to similar values during phase. We find a strong correlation between...
Abstract So far, even the highest resolution galaxy formation simulations with gravitational softening have failed to reproduce realistic life cycles of star clusters. We present first star-by-star models cluster account for hydrodynamics, formation, stellar evolution and collisional interactions between stars compact remnants using updated sphgal+ketju code, part griffin-project. Gravitational dynamics in vicinity >3 M⊙ their are solved a regularised integrator (ketju) without...
In this work we update the L-Galaxies semi-analytic model (SAM) to better follow physical processes responsible for growth of bulges via disc instabilities (leading pseudo-bulges) and mergers classical bulges). We address former by considering contribution both stellar gaseous discs in stability galaxy, latter including dissipation energy gas-rich mergers. Furthermore, introduce angular momentum losses during cooling find that an accurate match observed correlation between scale length mass...
ABSTRACT In this study of the ‘Resolving supermAssive Black hole Binaries galacTic hydrodynamical Simulations’ (RABBITS) series, we investigate orbital evolution supermassive black holes (SMBHs) during galaxy mergers. We simulate both disc and elliptical mergers using ketju code, which can simultaneously follow (hydro-)dynamics small-scale SMBH dynamics with post-Newtonian corrections. With our binary subgrid model, show how active galactic nuclei (AGNs) feedback affects properties...
As large-scale international collaborations become the standard for astronomy research, a wealth of opportunities have emerged to create innovative education and public outreach (EPO) programming. In past two decades, large focused EPO strategies around published data products. Newer begun explore other avenues engagement before after are made available. We present case study online program The Dark Energy Survey, currently one largest actively taking data. DES is unique at this scale in...
ABSTRACT We present an analysis of the cold gas phase in a low-metallicity starburst generated high-resolution hydrodynamical simulation gas-rich dwarf galaxy merger as part griffin project. The simulations resolve (4 M$_\odot$ mass resolution, $\sim$0.1 pc spatial resolution) multiphase interstellar medium with non-equilibrium chemical heating/cooling network at temperatures below 10$^4$ K. Massive stars are sampled individually and interact (ISM) through formation H ii regions supernova...
We present an analysis of the cold gas phase in a low metallicity starburst generated high-resolution hydrodynamical simulation gas-rich dwarf galaxy merger as part GRIFFIN project. The simulations resolve (4 M$_\odot$ mass resolution, $\sim$ 0.1 pc spatial resolution) multi-phase interstellar medium with non-equilibrium chemical heating/cooling network at temperatures below $10^4$ K. Massive stars are sampled individually and interact ISM through formation HII regions supernova explosions....
Observed low-mass galaxies with nuclear star clusters (NSCs) can host accreting massive black holes (MBH). We present simulations of dwarf ($M_{\mathrm{baryon}} \sim 0.6 - 2.4 \times 10^8 \rm \, M_\odot$) at solar mass resolution ($0.5\rm M_\odot < m_{\mathrm{gas}} 4 a multi-phase interstellar medium (ISM) and investigate the impact NSCs on MBH growth formation (SF). The Griffin simulation model includes non-equilibrium low temperature cooling, chemistry effect HII regions supernovae (SN)...
So far, even the highest resolution galaxy formation simulations with gravitational softening have failed to reproduce realistic life cycles of star clusters. We present first star-by-star models cluster account for hydrodynamics, formation, stellar evolution and collisional interactions between stars compact remnants using updated SPHGAL+KETJU code, part GRIFFIN-project. Gravitational dynamics in vicinity $>3$ M$_\odot$ their are solved a regularised integrator (KETJU) without softening....
In this study of the `Resolving supermAssive Black hole Binaries galacTic hydrodynamical Simulations' (RABBITS) series, we focus on hardening and coalescing process supermassive black (SMBH) binaries in galaxy mergers. For simulations including different formation processes (i.e. gas cooling, star formation, SMBH accretion, stellar AGN feedback), systematically control effect stochastic eccentricity by fixing it to similar values during phase. We find a strong correlation between merger...
In this study of the `Resolving supermAssive Black hole Binaries galacTic hydrodynamical Simulations' (RABBITS) series, we investigate orbital evolution supermassive black holes (SMBHs) during galaxy mergers. We simulate both disc and elliptical mergers using KETJU code, which can simultaneously follow (hydro-)dynamics small-scale SMBH dynamics with post-Newtonian corrections. With our binary subgrid model, show how active galactic nuclei (AGNs) feedback affects properties coalescence. find...
Abstract Recent observations have established that dwarf galaxies can host black holes of intermediate mass (IMBH, 100M ȯ < M IMBH ≲ 10 5 ). With modern numerical models, we test the growth IMBHs as well their evolutionary impact on galaxy. Our novel subsolar-mass (0.8 solar mass) resolution simulations ( * = 2 × 7 ) a resolved three-phase interstellar medium and account for non-equilibrium heating, cooling, chemistry processes. The stellar initial function is fully sampled between...
We present new GRIFFIN project hydrodynamical simulations that model the formation of galactic star cluster populations in low-metallicity ($Z=0.00021$) dwarf galaxies, including radiation, supernova and stellar wind feedback individual massive stars. In simulations, stars are sampled from initial mass function (IMF) down to hydrogen burning limit $0.08$ M$_\odot$. Mass conservation is enforced within a radius $1$ pc for find preferentially found clusters follow correlation set at birth...