M. L. N. Ashby
A5080778381- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Astro and Planetary Science
- Cosmology and Gravitation Theories
- CCD and CMOS Imaging Sensors
- Scientific Research and Discoveries
- Calibration and Measurement Techniques
- Geophysics and Gravity Measurements
- Atmospheric Ozone and Climate
- Spacecraft and Cryogenic Technologies
- Pulsars and Gravitational Waves Research
- Planetary Science and Exploration
- Spectroscopy and Laser Applications
- Superconducting and THz Device Technology
- Infrared Target Detection Methodologies
- Mechanics and Biomechanics Studies
- Remote Sensing in Agriculture
Center for Astrophysics Harvard & Smithsonian
2015-2024
Harvard University
2005-2015
Harvard University Press
1995-2015
University of Arizona
2015
Smithsonian Institution
2014
Max Planck Institute for Extraterrestrial Physics
2011
Mill Valley Public Library
2011
Smithsonian Astrophysical Observatory
1998-2004
Cornell University
1994-1995
University of California, Berkeley
1992
The Infrared Array Camera (IRAC) is one of three focal plane instruments in the Spitzer Space Telescope. IRAC a four-channel camera that obtains simultaneous broad-band images at 3.6, 4.5, 5.8, and 8.0 microns. Two nearly adjacent 5.2x5.2 arcmin fields view are viewed by four channels pairs (3.6 5.8 microns; 4.5 8 microns). All detector arrays 256x256 pixels size, with two shorter wavelength using InSb longer Si:As IBC detectors. powerful survey instrument because its high sensitivity, large...
The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) is designed to document the first third of galactic evolution, over approximate redshift (z) range 8--1.5. It will image >250,000 distant galaxies using three separate cameras on Hubble Space Telescope, from mid-ultraviolet near-infrared, and find measure Type Ia supernovae at z>1.5 test their accuracy as standardizable candles for cosmology. Five premier multi-wavelength sky regions are selected, each with...
This paper describes the Hubble Space Telescope imaging data products and reduction procedures for Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS). survey is designed to document evolution of galaxies black holes at $z\sim1.5-8$, study Type Ia SNe beyond $z>1.5$. Five premier multi-wavelength sky regions are selected, each with extensive multiwavelength observations. The primary CANDELS consist obtained in Wide Field Camera 3 / infrared channel (WFC3/IR) UVIS channel,...
We present a robust measurement and analysis of the rest-frame ultraviolet (UV) luminosity function at z=4-8. use deep Hubble Space Telescope imaging over CANDELS/GOODS fields, Ultra Deep Field Year 1 Frontier parallel observations. These surveys provides an effective volume 0.6-1.2 x 10^6 Mpc^3 this epoch, allowing us to perform search for faint (M_UV=-18) bright (M_UV < -21) galaxies. select candidate galaxies using well-tested photometric redshift technique with careful screening...
We present a catalog of galaxy clusters selected via their Sunyaev-Zel'dovich (SZ) effect signature from 2500 deg$^2$ South Pole Telescope (SPT) data. This work represents the complete sample detected at high significance in 2500-square-degree SPT-SZ survey, which was completed 2011. A total 677 (409) cluster candidates are identified above signal-to-noise threshold $\xi$ =4.5 (5.0). Ground- and space-based optical near-infrared (NIR) imaging confirms overdensities similarly colored galaxies...
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...
We present a UV-to-mid infrared multi-wavelength catalog in the CANDELS/GOODS-S field, combining newly obtained CANDELS HST/WFC3 F105W, F125W, and F160W data with existing public data. The is based on source detection WFC3 band. mosaic includes from deep wide observations as well previous ERS HUDF09 programs. reaches 5$\sigma$ limiting depth (within an aperture of radius 0.17 arcsec) 27.4, 28.2, 29.7 AB for wide, deep, HUDF regions, respectively. contains 34930 sources representative 50%...
We combine high-resolution HST/WFC3 images with multi-wavelength photometry to track the evolution of structure and activity massive (log(M*) > 10) galaxies at redshifts z = 1.4 - 3 in two fields Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS). detect compact, star-forming (cSFGs) whose number densities, masses, sizes, star formation rates qualify them as likely progenitors quiescent, (cQGs) 1.5 3. At 2 most cSFGs have specific star-formation (sSFR 10^-9 yr^-1) half...
We report the results of an 87 square-degree point-source survey centered at R.A. 5h30m, decl. -55 deg. taken with South Pole Telescope (SPT) 1.4 and 2.0 mm wavelengths arc-minute resolution milli-Jansky depth. Based on ratio flux in two bands, we separate detected sources into populations, one consistent synchrotron emission from active galactic nuclei (AGN) thermal dust. present source counts for each population 11 to 640 mJy 4.4 800 mm. The are dominated by synchrotron-dominated across...
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 present new observational determinations of the evolution 2-10keV X-ray luminosity function (XLF) AGN. utilise data from a number surveys including both 2Ms Chandra Deep Fields and AEGIS-X 200ks survey, enabling accurate measurements faint end XLF. combine direct, hard selection spectroscopic follow-up or photometric redshift estimates at z<1.2 with rest-frame UV colour pre-selection approach higher redshifts to avoid biases associated catastrophic failure redshifts. Only robust optical...
We measure new estimates for the galaxy stellar mass function and star formation rates samples of galaxies at z ∼ 4, 5, 6 7 using data in CANDELS GOODS South field. The deep near-infrared observations allow us to construct ≥ directly first time. estimate masses our sample by fitting observed spectral energy distributions with synthetic populations, including nebular line continuum emission. UV luminosity functions are consistent previous observations; however, we find that MUV-M* relation...
Using the Atacama Large Millimeter/submillimeter Array, we have conducted a blind redshift survey in 3 mm atmospheric transmission window for 26 strongly lensed dusty star-forming galaxies (DSFGs) selected with South Pole Telescope. The sources were to S1.4 > 20 mJy and dust-like spectrum and, remove low-z sources, not bright radio (S843 MHz < 6 mJy) or far-infrared counterparts (S100 μm 1 Jy, S60 200 mJy). We robustly detect 44 line features our survey, which identify as redshifted emission...
The galaxy stellar mass function (GSMF) at high-z provides key information on star-formation history and assembly in the young Universe. We aimed to use unique combination of deep optical/NIR/MIR imaging provided by HST, Spitzer VLT CANDELS-UDS, GOODS-South, HUDF fields determine GSMF over redshift range 3.5<z<7.5. utilised HST WFC3/IR NIR from CANDELS HUDF09, reaching H~27-28.5 a total area 369 arcmin2, with associated ACS optical data, IRAC SEDS programme, Y K-band Hawk-I images HUGS...
We report the orbital distribution of trans-Neptunian objects (TNOs) discovered during Canada–France Ecliptic Plane Survey (CFEPS), whose discovery phase ran from early 2003 until 2007. The follow-up observations started just after first discoveries and extended late 2009. obtained characterized 321 deg2 sky to depths in range g ∼ 23.5–24.4 AB mag. provide a database 169 TNOs with high-precision dynamical classification known efficiency. Using this database, we find that classical belt is...
The Spitzer Extended Deep Survey (SEDS) is a very deep infrared survey within five well-known extragalactic science fields: the UKIDSS Ultra-Deep Survey, Chandra Field South, COSMOS, Hubble North, and Groth Strip. SEDS covers total area of 1.46 deg2 to depth 26 AB mag (3σ) in both warm Infrared Array Camera (IRAC) bands at 3.6 4.5 μm. Because its uniform coverage so many widely-separated fields, subject roughly 25% smaller errors due cosmic variance than single-field same size. was designed...
(abridged) We present cosmological constraints obtained from galaxy clusters identified by their Sunyaev-Zel'dovich effect signature in the 2500 square degree South Pole Telescope Sunyaev Zel'dovich survey. consider 377 cluster candidates at z>0.25 with a detection significance greater than five, corresponding to 95% purity threshold for compute on models using measured abundance as function of mass and redshift. include additional multi-wavelength observations, including Chandra X-ray data...
We present a catalog of galaxy cluster candidates, selected through their Sunyaev–Zel'dovich (SZ) effect signature in the first 720 deg2 South Pole Telescope (SPT) survey. This area was mapped with SPT 2008 and 2009 austral winters to depth ∼18 μKCMB-arcmin at 150 GHz; 550 it also ∼44 95 GHz. Based on optical imaging all 224 candidates near-infrared majority we have found and/or infrared counterparts for 158, which then classify as confirmed clusters. Of these 158 clusters, 135 were...
We use measurements from the South Pole Telescope (SPT) Sunyaev Zel'dovich (SZ) cluster survey in combination with X-ray to constrain cosmological parameters. present a statistical method that fits for scaling relations of SZ and observables mass while jointly fitting cosmology. The is generalizable multiple observables, self-consistently accounts effects selection uncertainties calibration on derived constraints. apply this data set consisting an SZ-selected catalog 18 galaxy clusters at z...
We present the discovery of four surprisingly bright (H160 ∼ 26–27 mag AB) galaxy candidates at z 9–10 in complete HST CANDELS WFC3/IR GOODS-N imaging data, doubling number 10 that are known, just ∼500 Myr after big bang. Two similarly sources also detected a reanalysis GOODS-S data set. Three galaxies significantly 4.5σ–6.2σ very deep Spitzer/IRAC 4.5 μm as is one candidates. Furthermore, brightest our (at = 10.2 ± 0.4) robustly 3.6 (6.9σ), revealing flat UV spectral energy distribution...
ABSTRACT We present Hubble WFC3/IR slitless grism spectra of a remarkably bright z ≳ 10 galaxy candidate, GN-z11, identified initially from CANDELS/GOODS-N imaging data. A significant spectroscopic continuum break is detected at <?CDATA $\lambda =1.47\pm 0.01\;\mu {\rm{m}}$?> <?MML <mml:math> <mml:mi>λ</mml:mi> <mml:mo>=</mml:mo> <mml:mn>1.47</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.01</mml:mn> <mml:mspace width="0.25em"/> <mml:mi>&mgr;</mml:mi> <mml:mi...