A5078101036- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Adaptive optics and wavefront sensing
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Astrophysics and Cosmic Phenomena
- CCD and CMOS Imaging Sensors
- Radio Astronomy Observations and Technology
- Calibration and Measurement Techniques
- Scientific Research and Discoveries
- Spectroscopy and Laser Applications
- Cosmology and Gravitation Theories
- Pulsars and Gravitational Waves Research
- Advanced Vision and Imaging
- Geophysics and Gravity Measurements
- Infrared Target Detection Methodologies
- Remote Sensing in Agriculture
- History and Developments in Astronomy
- Atmospheric Ozone and Climate
- Particle Detector Development and Performance
- Advanced Image Processing Techniques
- Dark Matter and Cosmic Phenomena
University of Copenhagen
2018-2025
DAWN Center for Independent Living
2021-2024
Kennedy Center
2024
Space Telescope Science Institute
2004-2020
ORCID
2020
Technical University of Denmark
2019
Max Planck Institute for Astronomy
2019
Max Planck Society
2019
National Bureau of Investigation
2019
Universidad Andrés Bello
2017
Abstract The Astropy Project supports and fosters the development of open-source openly developed Python packages that provide commonly needed functionality to astronomical community. A key element is core package astropy , which serves as foundation for more specialized projects packages. In this article, we an overview organization project summarize features in package, recent major release, version 2.0. We then describe infrastructure designed facilitate support a broader ecosystem...
We describe a new program for determining photometric redshifts, dubbed EAZY. The is optimized cases where spectroscopic redshifts are not available, or only available biased subset of the galaxies. code combines features from various existing codes: it can fit linear combinations templates, includes optional flux- and redshift-based priors, its user interface modeled on popular HYPERZ code. A novel feature that default template set, as well functional forms based (usually highly biased)...
We study the star formation rate (SFR)–stellar mass (M⋆) relation in a self-consistent manner from 0 < z 2.5 with 22,816 star-forming galaxies selected NEWFIRM Medium-Band Survey. find significant nonlinear slope of relation, SFR∝M0.6⋆, and constant observed scatter 0.34 dex, independent redshift M⋆. However, if we select only blue linear SFR∝M⋆, similar to previous results at = by Peng et al. This selection excludes red, dusty, higher masses, which brings down slope. By selecting on LIR/LUV...
We study the growth of massive galaxies from z=2 to present using data NEWFIRM Medium Band Survey. The sample is selected at a constant number density n=2x10^-4 Mpc^-3, so that different epochs can be compared in meaningful way. show stellar mass this has increased by factor ~2 since z=2, following relation log(M)=11.45-0.15z. In order determine what physical radii occurred we construct very deep stacked rest-frame R-band images redshifts z=0.6, 1.1, 1.6, and 2.0. These image stacks...
Spectroscopic+photometric redshifts, stellar mass estimates, and rest-frame colors from the 3D-HST survey are combined with structural parameter measurements CANDELS imaging to determine galaxy size–mass distribution over redshift range 0 < z 3. Separating early- late-type galaxies on basis of star-formation activity, we confirm that early-type average smaller than at all find a significantly different rate size evolution fixed mass, fast for population, Reff∝(1 + z)−1.48, moderate z)−0.75....
We present measurements of the stellar mass functions (SMFs) star-forming and quiescent galaxies to z = 4 using a sample 95,675 Ks-selected in COSMOS/UltraVISTA field. The SMFs combined population are good agreement with previous show that density universe was only 50%, 10%, 1% its current value at ∼ 0.75, 2.0, 3.5, respectively. drives most overall growth, these increasing as ρstar∝(1 + z)−4.7 ± 0.4 since whereas increases z)−2.3 0.2. At > 2.5, dominate total SMF all masses, although...
The 3D-HST and CANDELS programs have provided WFC3 ACS spectroscopy photometry over ~900 square arcminutes in five fields: AEGIS, COSMOS, GOODS-North, GOODS-South, the UKIDSS UDS field. All these fields a wealth of publicly available imaging datasets addition to HST data, which makes it possible construct spectral energy distributions (SEDs) objects wide wavelength range. In this paper we describe photometric analysis ancillary data at wavelengths 0.3um 8um. Objects were selected near-IR...
We constrain the slope of star formation rate (SFR; log Ψ) to stellar mass (log M⋆) relation down (M⋆/M☉) = 8.4 9.2) at z 0.5 (z 2.5) with a mass-complete sample 39,106 star-forming galaxies selected from 3D-HST photometric catalogs, using deep photometry in CANDELS fields. For first time, we find that is dependent on mass, such it steeper low masses Ψ∝log than high Ψ∝(0.3–0.6)log M⋆). These low-mass slopes are found for three different indicators: combination ultraviolet (UV) and infrared...
We present the KMOS^3D survey, a new integral field survey of over 600 galaxies at 0.7<z<2.7 using KMOS Very Large Telescope (VLT). The utilizes synergies with multi-wavelength ground and space-based surveys to trace evolution spatially-resolved kinematics star formation from homogeneous sample 5 Gyrs cosmic history. Targets, drawn mass-selected parent 3D-HST cover formation-stellar mass ($M_*$) rest-frame $(U-V)-M_*$ planes uniformly. describe selection targets, observations, data...
We present 3D-HST, a near-infrared spectroscopic Treasury program with the Hubble Space Telescope for studying processes that shape galaxies in distant Universe. 3D-HST provides rest-frame optical spectra sample of ~7000 at 1<z<3.5, epoch when 60% all star formation took place, number density quasars peaked, first stopped forming stars, and structural regularity we see today must have emerged. will cover 3/4 (625 sq.arcmin) CANDELS survey area two orbits primary WFC3/G141 grism coverage to...
In this paper we present the MOSFIRE Deep Evolution Field (MOSDEF) survey. The MOSDEF survey aims to obtain moderate-resolution (R=3000-3650) rest-frame optical spectra (~3700-7000 Angstrom) for ~1500 galaxies at 1.37<z<3.80 in three well-studied CANDELS fields: AEGIS, COSMOS, and GOODS-N. Targets are selected redshift intervals: 1.37<z<1.70, 2.09<z<2.61, 2.95<z<3.80, down fixed H_AB (F160W) magnitudes of 24.0, 24.5 25.0, respectively, using photometric spectroscopic catalogs from 3D-HST We...
We present reduced data and products from the 3D-HST survey, a 248-orbit HST Treasury program. The survey obtained WFC3 G141 grism spectroscopy in four of five CANDELS fields: AEGIS, COSMOS, GOODS-S, UDS, along with H140 imaging, parallel ACS G800L spectroscopy, I814 imaging. In previous paper, we presented photometric catalogs these fields GOODS-N, fifth field. Here describe spectroscopic data, again augmented GO-1600 GOODS-N (PI: B. Weiner). developed software to automatically optimally...
Abstract The first few 100 Myr at z > 10 mark the last major uncharted epoch in history of universe, where only a single galaxy (GN-z11 ≈ 11) is currently spectroscopically confirmed. Here we present search for luminous galaxies with JWST/NIRCam photometry spanning ≈1–5 μ m and covering 49 arcmin 2 from public JWST Early Release Science programs (CEERS GLASS). Our most secure candidates are two M UV −21 systems: GLASS-z12 GLASS-z10. These display abrupt ≳1.8 mag breaks their spectral...
We study the buildup of bimodal galaxy population using NEWFIRM Medium-Band Survey, which provides excellent redshifts and well-sampled spectral energy distributions ≈27, 000 galaxies with K < 22.8 at 0.4 z 2.2. first show that star-forming quiescent can be robustly separated a two-color criterion over this entire redshift range. then evolution number density mass galaxies, extending results COMBO-17, DEEP2, other surveys to = The M ≳ 3 × 1010 M☉ increases by factor ∼10 from ∼ 2 present day,...
We present deep near-IR (NIR) medium-bandwidth photometry over the wavelength range 1–1.8 μm in All-wavelength Extended Groth strip International Survey (AEGIS) and Cosmic Evolution (COSMOS) fields. The observations were carried out using NOAO Extremely Wide-Field Infrared Imager (NEWFIRM) on Mayall 4 m Telescope Kitt Peak as part of NEWFIRM Medium-Band (NMBS), an survey program. In this paper, we describe full details observations, data reduction, for survey. also a public K-selected...
In this paper we study a key phase in the formation of massive galaxies: transition star forming galaxies into (M_stars~10^11 Msun), compact (r_e~1 kpc) quiescent galaxies, which takes place from z~3 to z~1.5. We use HST grism redshifts and extensive photometry all five 3D-HST/CANDELS fields, more than doubling area used previously for such studies, combine these data with Keck MOSFIRE NIRSPEC spectroscopy. first confirm that population massive, compact, exists at z~2, using K-band...
We present a Ks-selected catalog, dubbed FIREWORKS, for the Chandra Deep Field-South (CDF-S) containing photometry in U38, B435, B, V, V606, R, i775, I, z850, J, H, Ks, [3.6 μm], [4.5 [5.8 [8.0 and MIPS [24 μm] bands. The imaging has typical Ktots,AB limit of 24.3 mag (5 σ) coverage over 113 arcmin2 all bands 138 but H. cross-correlate our catalog with 1 Ms X-ray by Giacconi et al. (2002) available spectroscopic redshifts to date. find explain systematic differences comparison "z850 +...
Using observations from the FourStar Galaxy Evolution Survey (ZFOURGE), we obtain deepest measurements to date of galaxy stellar mass function (SMF) at 0.2 < z 3. ZFOURGE provides well-constrained photometric redshifts made possible through deep medium-bandwidth imaging 1–2 μm. We combine this with Hubble Space Telescope Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey, allowing for efficient selection both blue and red galaxies down masses ∼109.5 M☉ ∼ 2.5. The total surveyed area is...
ABSTRACT We explore star formation histories (SFHs) of galaxies based on the evolution rate stellar mass relation (SFR– M * ). Using data from FourStar Galaxy Evolution Survey (ZFOURGE) in combination with far-IR imaging Spitzer and Herschel observatories we measure SFR– at 0.5 < z 4. Similar to recent works find that average infrared spectral energy distributions are roughly consistent a single template across broad range redshifts masses, evidence for only weak deviations. is not power...
Exploiting the deep high-resolution imaging of all five CANDELS fields, and accurate redshift information provided by 3D-HST, we investigate relation between structure stellar populations for a mass-selected sample 6764 galaxies above 1010 M☉, spanning range 0.5 < z 2.5. For first time, fit two-dimensional models comprising single Sérsic two-component (i.e., bulge + disk) decompositions not only to H-band light distributions, but also mass maps reconstructed from resolved population...
Abstract The Cosmic Evolution Survey (COSMOS) has become a cornerstone of extragalactic astronomy. Since the last public catalog in 2015, wealth new imaging and spectroscopic data have been collected COSMOS field. This paper describes collection, processing, analysis these to produce reference photometric redshift catalog. Source detection multiwavelength photometry are performed for 1.7 million sources across 2 deg field, ∼966,000 which measured with all available broadband using both...
Abstract What are the faintest distant galaxies we can see with Hubble Space Telescope ( HST ) now, before launch of James Webb ? This is challenge taken up by Frontier Fields, a Director’s discretionary time campaign and Spitzer to deeper into universe than ever before. The Fields combines power natural gravitational telescopes massive high-magnification clusters produce deepest observations their lensed obtained. Six clusters—Abell 2744, MACSJ0416.1-2403, MACSJ0717.5+3745,...
We use a robust sample of 11 z~7 galaxies (z-dropouts) to estimate the stellar mass density universe when it was only ~750 Myr old. combine very deep optical near-Infrared photometry from HST ACS and NICMOS cameras with mid-Infrared Spitzer IRAC imaging available through GOODS program. After carefully removing flux contaminating foreground sources we have obtained reliable in 3.6 4.5 micron channels. The spectral shapes these sources, including their rest frame colors, strongly support being...
In 1964, Refsdal hypothesized that a supernova whose light traversed multiple paths around strong gravitational lens could be used to measure the rate of cosmic expansion. We report discovery such system. Hubble Space Telescope imaging, we have found four images single forming an Einstein cross configuration redshift z=0.54 elliptical galaxy in MACS J1149.6+2223 cluster. The cluster's potential also creates z=1.49 spiral host galaxy, and future appearance elsewhere cluster field is expected....