Michael C. Cooper
A5036881332- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astrophysics and Star Formation Studies
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- CCD and CMOS Imaging Sensors
- Particle Detector Development and Performance
- Japanese History and Culture
- Remote Sensing in Agriculture
- Advanced Vision and Imaging
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Spacecraft Design and Technology
- Electron and X-Ray Spectroscopy Techniques
- Spectroscopy and Laser Applications
- Advanced X-ray and CT Imaging
- Satellite Communication Systems
- Scientific Research and Discoveries
- Space Satellite Systems and Control
- Medical Imaging Techniques and Applications
- Phase Equilibria and Thermodynamics
University of California, Irvine
2016-2025
MIT Lincoln Laboratory
2023-2024
Massachusetts Institute of Technology
2022-2024
University of Liverpool
2023
University of Arizona
2008-2012
University of California, Berkeley
2003-2008
University of Massachusetts Amherst
2008
Berkeley College
2004
Center for Applied Special Technology
2001
Ferris State University
1998-2001
The DEEP2 and COMBO-17 surveys are used to study the evolution of luminosity function red blue galaxies $z \sim 1$. Schechter fits show that, since = 1$, $M^*_B$ dims by $\sim$ 1.3 mag per unit redshift for both color classes, $ϕ^*$ shows little change, while has formally nearly quadrupled. At face value, number density remained roughly constant $ z whereas that been rising. Luminosity densities support conclusions, but we note most red-galaxy occurs between our data local in highest bin,...
We use the first systematic data sets of CO molecular line emission in z∼ 1–3 normal star-forming galaxies (SFGs) for a comparison dependence galaxy-averaged star formation rates on gas masses at low and high redshifts, different galactic environments. Although current high-z samples are still small biased towards luminous massive tail actively ‘main-sequence’, fairly clear picture is emerging. Independent whether galaxy-integrated quantities or surface densities considered, low- SFG...
The extragalactic background light (EBL) is of fundamental importance both for understanding the entire process galaxy evolution and γ-ray astronomy, but overall spectrum EBL between 0.1 1000 μm has never been determined directly from spectral energy distribution (SED) observations over a wide redshift range. evolving, derived here utilizing novel method based on only. This achieved observed rest-frame K-band luminosity function up to 4, combined with determination galaxy-SED-type fractions....
We describe the design and data sample from DEEP2 Galaxy Redshift Survey, densest largest precision-redshift survey of galaxies at z ~ 1 completed to date. The has conducted a comprehensive census massive galaxies, their properties, environments, large-scale structure down absolute magnitude M_B = -20 via ~90 nights observation on DEIMOS spectrograph Keck Observatory. covers an area 2.8 deg^2 divided into four separate fields, observed limiting apparent R_AB=24.1. Objects with < 0.7 are...
This paper provides an update of our previous scaling relations (Genzel et al.2015) between galaxy integrated molecular gas masses, stellar masses and star formation rates, in the framework main-sequence (MS), with main goal to test for possible systematic effects. For this purpose new study combines three independent methods determining from CO line fluxes, far-infrared dust spectral energy distributions, ~1mm photometry, a large sample 1444 forming galaxies (SFGs) z=0 4. The covers mass...
We characterize the mass-dependent evolution of more than 8000 galaxies using spectroscopic redshifts from DEEP2 Galaxy Redshift Survey in range 0.4 < z 1.4 and stellar masses calculated K-band photometry obtained at Palomar Observatory. This sample spans 1.5 deg2 four independent fields. Using rest-frame U - B color [O II] equivalent widths, we distinguish star-forming passive populations order to explore nature ``downsizing''—a pattern which sites active star formation shift high-mass...
Galactic winds are a prime suspect for the metal enrichment of intergalactic medium and may have strong influence on chemical evolution galaxies nature QSO absorption line systems. We use sample 1406 galaxy spectra at z~1.4 from DEEP2 redshift survey to show that blueshifted Mg II 2796, 2803 A is ubiquitous in starforming this epoch. This first detection frequent outflowing galactic z~1. The presence depth independent AGN spectral signatures or morphology; major mergers not prerequisite...
In this the first of a series Letters, we present panchromatic data set in Extended Groth Strip region sky. Our survey, All-Wavelength International Survey (AEGIS), aims to study physical properties and evolutionary processes galaxies at z ~ 1. It includes following deep, wide-field imaging sets: Chandra/ACIS X-ray, GALEX ultraviolet, CFHT/MegaCam Legacy optical, CFHT/CFH12K Hubble Space Telescope/ACS optical NICMOS near-infrared, Palomar/WIRC Spitzer/IRAC mid-infrared, Spitzer/MIPS...
Using the combined capabilities of large near-infrared Palomar/DEEP-2 survey, and superb resolution ACS HST camera, we explore size evolution 831 very massive galaxies (M*>10^{11}h_{70}^{-2}M_sun) since z~2. We split our sample according to their light concentration using Sersic index n. At a given stellar mass, both low (n<2.5) high (n>2.5) concentrated objects were much smaller in past than local counterparts. This is particularly strong for highly (spheroid-like) objects. z~1.5,...
The DEIMOS spectrograph has now been installed on the Keck-II telescope and commissioning is nearly complete. DEEP2 Redshift Survey, which will take approximately 120 nights at Keck Observatory over a three year period designed to utilize power of DEIMOS, began in summer 2002. multiplexing high efficiency enables us target 1000 faint galaxies per clear night. Our goal gather high-quality spectra \~60,000 with z>0.75 order study properties large scale clustering z ~ 1. survey be executed...
The evolution of the B-band galaxy luminosity function is measured using a sample more than 11,000 galaxies with spectroscopic redshifts from DEEP2 Redshift Survey. rest-frame M_B versus U-B color-magnitude diagram shows that bi-modality seen in locally still present at z > 1. Dividing trough this color bimodality into predominantly red and blue galaxies, we find each type evolves differently. Blue counts tend to shift brighter magnitudes constant number density, while remain largely...
Variable X-ray and gamma-ray emission is characteristic of the most extreme physical processes in Universe, studying sources these energetic photons has been a major driver astronomy for past 50 years. Here we present multiwavelength observations unique selected transient, discovered by Swift, which was accompanied bright across electromagnetic spectrum, whose properties are unlike any previously observed source. We pinpoint event to center small, star-forming galaxy at redshift z=0.3534....
Abstract We present an investigation into the first 500 Myr of galaxy evolution from Cosmic Evolution Early Release Science (CEERS) survey. CEERS, one 13 JWST ERS programs, targets formation z ∼ 0.5 to >10 using several imaging and spectroscopic modes. make use epoch CEERS NIRCam imaging, spanning 35.5 arcmin 2 , search for candidate galaxies at > 9. Following a detailed data reduction process implementing custom steps produce high-quality reduced images, we perform multiband...
We present the quantitative rest-frame B morphological evolution and galaxy merger fractions at 0.2 < z 1.2 as observed by All-wavelength Extended Groth Strip International Survey (AEGIS). use Gini coefficent M_20 to identify major mergers classify morphology for a volume-limited sample of 3009 galaxies brighter than 0.4 L_B^*, assuming pure luminosity 1.3 M_B per unit redshift. find that fraction remains roughly constant 10 +/- 2% 1.2. The E/S0/Sa increases from 21+/- 3% ~ 1.1 44 9% 0.3,...
We present the multiwavelength - ultraviolet to mid-infrared catalog of UKIDSS Ultra-Deep Survey (UDS) field observed as part Cosmic Assembly Near-infrared Deep Extragalactic Legacy (CANDELS). Based on publicly available data, includes: CANDELS data from Hubble Space Telescope (near-infrared WFC3 F125W and F160W visible ACS F606W F814W data), u-band CFHT/Megacam, B, V, Rc, i' z' band Subaru/Suprime-Cam, Y Ks VLT/HAWK-I, J, H K bands (Data Release 8), Spitzer/IRAC (3.6, 4.5 SEDS, 5.8 8.0um...
We use the first systematic samples of CO millimeter emission in z>1 'main-sequence' star forming galaxies (SFGs) to study metallicity dependence conversion factor {\alpha}CO, from line luminosity molecular gas mass. The depletion rate inferred ratio formation (SFR) luminosity, is ~1 Gyr-1 for near-solar with stellar masses above M_S~1e11 M_sun. In this regime does not vary more than a two three as function surface density, or redshift between z~0 and 2. Below M_S increases rapidly...
We report the discovery of a candidate galaxy with photo-z z~12 in first epoch JWST Cosmic Evolution Early Release Science (CEERS) Survey. Following conservative selection criteria we identify source robust z_phot = 11.8^+0.3_-0.2 (1-sigma uncertainty) m_F200W=27.3, and >7-sigma detections five filters. The is not detected at lambda < 1.4um deep imaging from both HST JWST, has faint ~3-sigma F150W F160W, which signal Ly-alpha break near red edge filters, implying z~12. This object (Maisie's...
We present the public release of stellar mass catalogs for GOODS-S and UDS fields obtained using some deepest near-IR images available, achieved as part Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey project. combine effort from 10 different teams, who computed masses same photometry redshifts. Each team adopted their preferred fitting code, assumptions, priors, parameter grid. The combination results underlying isochrones reduces systematics associated with code other...
Abstract We report on the discovery of two low-luminosity, broad-line active galactic nuclei (AGNs) at z > 5 identified using JWST NIRSpec spectroscopy from Cosmic Evolution Early Release Science (CEERS) survey. detect broad H α emission in spectra both sources, with FWHM 2060 ± 290 km s −1 and 1800 200 , resulting virial black hole (BH) masses that are 1–2 dex below those existing samples luminous quasars 5. The first source, CEERS 2782 = 5.242, is 2–3 fainter than known similar...
Abstract We present the data release and reduction process for Epoch 1 NIRCam observations Cosmic Evolution Early Release Science Survey (CEERS). These consist of imaging in six broadband filters (F115W, F150W, F200W, F277W, F356W F444W) one medium-band filter (F410M) over four pointings, obtained parallel with primary CEERS MIRI observations. reduced JWST Calibration Pipeline, custom modifications steps designed to address additional features challenges data. Here we provide a detailed...
We propose that the ultra-diffuse galaxy (UDG) population represents a set of satellite galaxies born in ∼1010−1011 M⊙ haloes, similar to field dwarfs, which suffer dramatic reduction surface brightness due tidal stripping and heating. This scenario is observationally motivated by radial alignment UDGs Coma as well significant dependence UDG abundance on cluster mass. As test this formation scenario, we apply semi-analytic model describing change stellar mass half-light radius dwarf...
Abstract We present JWST NIRSpec spectroscopy for 11 galaxy candidates with photometric redshifts of z ≃ 9 − 13 and M UV ∈ [ −21, −18] newly identified in NIRCam images the Cosmic Evolution Early Release Science Survey. confirm emission line 7 galaxies at = 7.762–8.998 using spectra ∼1–5 μ m either prism or its three medium-resolution ( R ∼ 1000) gratings. For candidates, we achieve a high confirmation rate ≃90%, which validates classical dropout selection from photometry. No robust lines...
Lyman Break Galaxy (LBG) candidates at z>10 are rapidly being identified in JWST/NIRCam observations. Due to the (redshifted) break produced by neutral hydrogen absorption of rest-frame UV photons, these sources expected drop out bluer filters while well detected redder filters. However, here we show that dust-enshrouded star-forming galaxies lower redshifts (z<7) may also mimic near-infrared (near-IR) colors LBGs, representing potential contaminants LBG candidate samples. First, analyze...
We present rest-frame optical emission-line flux ratio measurements for five $z>5$ galaxies observed by the JWST Near-Infared Spectrograph (NIRSpec) in SMACS 0723 Early Release Observations. add several quality-control and post-processing steps to NIRSpec pipeline reduction products order ensure reliable relative calibration of emission lines that are closely separated wavelength, despite uncertain \textit{absolute} spectrophotometry current version reductions. Compared $z\sim3$ literature,...