Sinan Deger
A5053416634- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Spectroscopy and Laser Applications
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Atmospheric Ozone and Climate
- Statistical Methods and Bayesian Inference
- COVID-19 epidemiological studies
- Inertial Sensor and Navigation
- Data Analysis with R
- Atmospheric and Environmental Gas Dynamics
- Diet and metabolism studies
- Pharmacological Effects and Assays
- Soil Geostatistics and Mapping
- Advanced Vision and Imaging
- Remote Sensing in Agriculture
- Advanced Statistical Methods and Models
- Advanced Sensor and Control Systems
- Refrigeration and Air Conditioning Technologies
- Phase Equilibria and Thermodynamics
- Spectroscopy and Chemometric Analyses
- Statistical Methods and Applications
California Institute of Technology
2019-2024
University of Cambridge
2024
Infrared Processing and Analysis Center
2019-2023
Stockholm University
2023
AlbaNova
2023
University of Kansas
2018
Gazi University
2013
Abstract We present PHANGS–ALMA, the first survey to map CO J = 2 → 1 line emission at ∼1″ ∼100 pc spatial resolution from a representative sample of 90 nearby ( d ≲ 20 Mpc) galaxies that lie on or near z 0 “main sequence” star-forming galaxies. traces bulk distribution molecular gas, which is cold, phase interstellar medium. At achieved by each beam reaches size typical individual giant cloud, so these data can be used measure demographics, life cycle, and physical state clouds across...
PHANGS-HST is an ultraviolet-optical imaging survey of 38 spiral galaxies within ~20 Mpc. Combined with the PHANGS-ALMA, PHANGS-MUSE surveys and other multiwavelength data, dataset will provide unprecedented look into connections between young stars, HII regions, cold molecular gas in these nearby star-forming galaxies. Accurate distances are needed to transform measured observables physical parameters (e.g., brightness luminosity, angular sizes clouds, star clusters associations). has...
Abstract The PHANGS program is building the first data set to enable multiphase, multiscale study of star formation across nearby spiral galaxy population. This effort enabled by large survey programs with Atacama Large Millimeter/submillimeter Array (ALMA), MUSE on Very Telescope, and Hubble Space Telescope (HST), which we have obtained CO(2–1) imaging, optical spectroscopic mapping, high-resolution UV–optical respectively. Here, present PHANGS-HST, has NUV– U – B V I imaging disks 38...
The PHANGS collaboration has been building a reference dataset for the multi-scale, multi-phase study of star formation and interstellar medium in nearby galaxies. With successful launch commissioning JWST, we can now obtain high-resolution infrared imaging to probe youngest stellar populations dust emission on scales clusters molecular clouds ($\sim$5-50 pc). In Cycle 1, is conducting an 8-band survey from 2-21$\mu$m 19 spiral CO(2-1) mapping, optical integral field spectroscopy, UV-optical...
We present improved methods for segmenting CO emission from galaxies into individual molecular clouds, providing an update to the CPROPS algorithms presented by Rosolowsky & Leroy (2006; arXiv:astro-ph/0601706 ). The new code enables both homogenization of noise and spatial resolution among data, which allows rigorous comparative analysis. also models completeness data via false source injection includes updated segmentation approach better deal with blended emission. These are...
We present a rich, multiwavelength, multiscale database built around the PHANGS-ALMA CO$\,$(2-1) survey and ancillary data. use this to distributions of molecular cloud populations sub-galactic environments in 80 PHANGS galaxies, characterize relationship between population-averaged properties host galaxy properties, assess key timescales relevant evolution star formation. show that probes wide range kpc-scale gas, stellar, formation rate (SFR) surface densities, as well orbital velocities...
The first JWST observations of nearby galaxies have unveiled a rich population bubbles that trace the stellar feedback mechanisms responsible for their creation. Studying these therefore allows us to chart interaction between and interstellar medium, larger galactic flows needed regulate star formation processes globally. We present catalog in NGC628, visually identified using MIRI F770W PHANGS-JWST observations, use them statistically evaluate bubble characteristics. classify 1694...
Abstract PHANGS–JWST mid-infrared (MIR) imaging of nearby spiral galaxies has revealed ubiquitous filaments dust emission in intricate detail. We present a pilot study to systematically map the filament network (DFN) at multiple scales between 25 and 400 pc NGC 628. MIRI images 7.7, 10, 11.3, 21 μ m 628 are used generate maps emission, while PHANGS–HST B -band yields attenuation features. quantify correspondence traced by MIR thermal continuum/polycyclic aromatic hydrocarbon (PAH) detected...
Abstract The exquisite angular resolution and sensitivity of JWST are opening a new window for our understanding the Universe. In nearby galaxies, observations revolutionizing first phases star formation dusty interstellar medium. Nineteen local galaxies spanning range properties morphologies across star-forming main sequence have been observed as part PHANGS-JWST Cycle 1 Treasury program at spatial scales ∼5–50 pc. Here, we describe pjpipe , an image-processing pipeline developed that wraps...
ABSTRACT The spatial distribution of metals reflects, and can be used to constrain, the processes chemical enrichment mixing. Using PHANGS-MUSE optical integral field spectroscopy, we measure gas-phase oxygen abundances (metallicities) across 7138 H ii regions in a sample eight nearby disc galaxies. In Paper I, report linear radial gradients metallicities each galaxy, qualitatively searched for azimuthal abundance variations. Here, examine 2D variation once gradient is subtracted, Δ(O/H),...
ABSTRACT The sensitivity and angular resolution of photometric surveys executed by the Hubble Space Telescope (HST) enable studies individual star clusters in galaxies out to a few tens megaparsecs. fitting spectral energy distributions (SEDs) is essential for measuring their physical properties studying evolution. We report on use publicly available Code Investigating GALaxy Emission (cigale) SED package derive ages, stellar masses, reddenings identified Physics at High Angular Nearby...
When completed, the PHANGS-HST project will provide a census of roughly 50,000 compact star clusters and associations, as well human morphological classifications for 20,000 those objects. These large numbers motivated development more objective repeatable method to help perform source classifications. In this paper we consider results five galaxies (NGC 628, NGC 1433, 1566, 3351, 3627) using from two convolutional neural network architectures (RESNET VGG) trained deep transfer learning...
We present a comparison of theoretical predictions dust continuum and polycyclic aromatic hydrocarbon (PAH) emission with new JWST observations in three nearby galaxies: NGC 628, 1365, 7496. Our analysis focuses on total 1063 compact stellar clusters 2654 associations previously characterized by HST the galaxies. find that distributions trends observed PAH-focused infrared colors generally agree expectations, bulk is more aligned models larger, ionized PAHs. These data usher era probing...
Abstract The earliest stages of star formation occur enshrouded in dust and are not observable the optical. Here we leverage extraordinary new high-resolution infrared imaging from JWST to begin study dust-embedded clusters nearby galaxies throughout Local Volume. We present a technique for identifying NGC 7496 (18.7 Mpc), first galaxy be observed by PHANGS–JWST Cycle 1 Treasury Survey. select sources that have strong 3.3 μ m PAH emission based on F300M − F335M color excess identify 67...
A long-standing problem when deriving the physical properties of stellar populations is degeneracy between age, reddening, and metallicity. When a single metallicity used for all star clusters in galaxy, this can result $`$catastrophic$'$ errors old globular clusters. Typically, approximately 10 - 20 % detected spiral galaxies have ages that are incorrect by factor ten or more. In paper we present pilot study four (NGC 628, NGC 1433, 1365, 3351) from PHANGS-HST survey. We describe methods to...
The morphology of HII regions around young star clusters provides insight into the timescales and physical processes that clear a cluster's natal gas. We study ~700 (<10Myr) in three nearby spiral galaxies (NGC 7793, NGC 4395, 1313) using Hubble Space Telescope (HST) imaging from LEGUS (Legacy ExtraGalactic Ultraviolet Survey). Clusters are classified by their H$\alpha$ (concentrated, partially exposed, no-emission) whether they have neighboring (which could affect clearing timescales)....
We present an innovative and widely applicable approach for the detection classification of stellar clusters, developed PHANGS-HST Treasury Program, $NUV$-to-$I$ band imaging campaign 38 spiral galaxies. Our pipeline first generates a unified master source list stars candidate to enable self-consistent inventory all star formation products. To distinguish cluster candidates from stars, we introduce Multiple Concentration Index (MCI) parameter, measure inner outer MCIs probe morphology in...
Context. Stellar feedback is one of the fundamental factors regulating evolution galaxies. However, we still do not have access to strong observational constraints on relative importance different mechanisms (e.g. radiation, ionised gas pressure, stellar winds) in driving H II region and molecular cloud disruption. To quantify compare mechanisms, size an crucial, whereas samples well-resolved regions are scarce. Aims. We constrain various from young massive star populations by resolving...
Abstract We compare embedded young massive star clusters (YMCs) to (sub-)millimeter line observations tracing the excitation and dissociation of molecular gas in starburst ring NGC 1365. This galaxy hosts one strongest nuclear starbursts richest populations YMCs within 20 Mpc. Here we combine near-/mid-IR PHANGS–JWST imaging with new Atacama Large Millimeter/submillimeter Array multi- J CO (1–0, 2–1 4–3) [ C i ] (1–0) mapping, which use trace via R 42 = I CO(4−3) / CO(2−1) 21 CO(1−0) CICO...
Abstract We present the largest catalog to date of star clusters and compact associations in nearby galaxies. have performed a V -band-selected census across 38 spiral galaxies PHANGS–Hubble Space Telescope (HST) Treasury Survey, measured integrated, aperture-corrected near-ultraviolet- U-B-V-I photometry. This work has resulted uniform catalogs that contain ∼20,000 associations, which passed human inspection morphological classification, larger sample ∼100,000 classified by neural network...
Abstract We present new catalogs of likely globular clusters (GCs) in 17 nearby spiral galaxies studied as part the PHANGS Hubble Space Telescope (HST) Treasury Survey. The were imaged five broadband filters from near-ultraviolet through I band. PHANGS-HST has produced stellar all ages by selecting extended sources (from multiple concentration index measurements) followed morphological classification (centrally concentrated and symmetric or asymmetric, peaks, contaminants) visually examining...
ABSTRACT Connecting the gas in H ii regions to underlying source of ionizing radiation can help us constrain physical processes stellar feedback and how evolve over time. With PHANGS–MUSE, we detect nearly 24 000 across 19 galaxies measure properties ionized (e.g. metallicity, ionization parameter, density). We use catalogues multiscale associations from PHANGS–HST obtain constraints on age sources. construct a matched catalogue 4177 that are clearly linked single association. A weak...
ABSTRACT We develop a method to identify and determine the physical properties of stellar associations using Hubble Space Telescope (HST) NUV−U−B−V−I imaging nearby galaxies from Physics at High Angular Resolution in Nearby GalaxieS with (PHANGS–HST) survey. apply watershed algorithm density maps constructed point source catalogues Gaussian smoothed multiple scales 8 64 pc. our on two that span distance range PHANGS–HST sample: NGC 3351 (10 Mpc) 1566 (18 Mpc). test different parameters such...
We present pop-cosmos: a comprehensive model characterizing the galaxy population, calibrated to $140,938$ galaxies from Cosmic Evolution Survey (COSMOS) with photometry in $26$ bands ultra-violet infra-red. construct detailed forward for COSMOS data, comprising: population describing joint distribution of characteristics and its evolution (parameterized by flexible score-based diffusion model); state-of-the-art stellar synthesis (SPS) connecting galaxies' instrinsic properties their...
Abstract We present pop-cosmos : a comprehensive model characterizing the galaxy population, calibrated to 140,938 ( r < 25 selected) galaxies from Cosmic Evolution Survey (COSMOS) with photometry in 26 bands ultraviolet infrared. construct detailed forward for COSMOS data, comprising: population describing joint distribution of characteristics and its evolution (parameterized by flexible score-based diffusion model); state-of-the-art stellar synthesis connecting galaxies’ intrinsic...