James E. Aguirre
A5070562377- Radio Astronomy Observations and Technology
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Superconducting and THz Device Technology
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Antenna Design and Optimization
- Radio Wave Propagation Studies
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Particle Accelerators and Free-Electron Lasers
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Adaptive optics and wavefront sensing
- Geophysics and Gravity Measurements
- Spectroscopy and Laser Applications
- Scientific Research and Discoveries
- Electromagnetic Compatibility and Measurements
- Dark Matter and Cosmic Phenomena
- Millimeter-Wave Propagation and Modeling
- Soil Moisture and Remote Sensing
- Terahertz technology and applications
- Thermal Radiation and Cooling Technologies
- Microwave Engineering and Waveguides
University of Pennsylvania
2016-2025
California University of Pennsylvania
2008-2024
University of California, Berkeley
2024
Philadelphia University
2009-2022
Penn Center for AIDS Research
2021
Software (Spain)
2019
University of Groningen
2015
Pennsylvania State University
2015
National Radio Astronomy Observatory
2006-2011
Laboratory for Atmospheric and Space Physics
2005-2011
The Simons Observatory (SO) is a new cosmic microwave background experiment being built on Cerro Toco in Chile, due to begin observations the early 2020s. We describe scientific goals of experiment, motivate design, and forecast its performance. SO will measure temperature polarization anisotropy six frequency bands: 27, 39, 93, 145, 225 280 GHz. initial configuration have three small-aperture 0.5-m telescopes (SATs) one large-aperture 6-m telescope (LAT), with total 60,000 cryogenic...
The Hydrogen Epoch of Reionization Array (HERA) is a staged experiment to measure 21 cm emission from the primordial intergalactic medium (IGM) throughout cosmic reionization ($z=6-12$), and explore earlier epochs our Cosmic Dawn ($z\sim30$). During these epochs, early stars black holes heated ionized IGM, introducing fluctuations in emission. HERA designed characterize evolution power spectrum constrain timing morphology reionization, properties first galaxies, large-scale structure,...
We are developing the Precision Array for Probing Epoch of Re-ionization (PAPER) to detect 21 cm emission from early universe, when first stars and galaxies were forming. describe overall experiment strategy architecture summarize two PAPER deployments: a four-antenna array in low radio frequency interference (RFI) environment Western Australia an eight-antenna at prototyping site NRAO facilities near Green Bank, WV. From these activities we report on system performance, including primary...
Gravitational lensing is a powerful astrophysical and cosmological probe particularly valuable at submillimeter wavelengths for the study of statistical individual properties dusty starforming galaxies. However identification gravitational lenses often time-intensive, involving sifting large volumes imaging or spectroscopic data to find few candidates. We used early from Herschel Astrophysical Terahertz Large Area Survey demonstrate that wide-area surveys can simply easily detect strong...
A critical challenge in measuring the power spectrum of 21 cm emission from cosmic reionization is compensating for frequency dependence an interferometer's sampling pattern, which can cause smooth-spectrum foregrounds to appear unsmooth and degrade separation between target signal. In this paper, we present approach foreground removal that explicitly accounts dependence. We apply delay transformation introduced Parsons & Backer each baseline interferometer concentrate within bounds maximum...
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...
In this paper, we report new limits on 21cm emission from cosmic reionization based a 135-day observing campaign with 64-element deployment of the Donald C. Backer Precision Array for Probing Epoch Reionization (PAPER) in South Africa. This work extends presented Parsons et al. (2014) more collecting area, longer period, improved redundancy-based calibration, optimal fringe-rate filtering, and power-spectral analysis using quadratic estimators. The result is $2\sigma$ upper limit...
We present new constraints on the 21cm Epoch of Reionization (EoR) power spectrum derived from 3 months observing with a 32-antenna, dual-polarization deployment Donald C. Backer Precision Array for Probing (PAPER) in South Africa. In this paper, we demonstrate efficacy delay-spectrum approach to avoiding foregrounds, achieving over 8 orders magnitude foreground suppression (in $\textrm{mK}^2$). Combining procedure removing off-diagonal covariances arising instrumental systematics, achieve...
A number of experiments are currently working toward a measurement the 21 cm signal from epoch reionization (EoR). Whether or not these deliver detection cosmological emission, their limited sensitivity will prevent them providing detailed information about astrophysics reionization. In this work, we consider what types measurements be enabled by next generation larger EoR telescopes. To calculate type constraints that possible with such arrays, use simple models for instrument, foreground...
Following the first two annual intensity mapping workshops at Stanford in March 2016 and Johns Hopkins June 2017, we report on recent advances theory, instrumentation observation that were presented these meetings some of opportunities challenges identified looking forward. With preliminary detections CO, [CII], Lya low-redshift 21cm, a host experiments set to go online next few years, field is rapidly progressing all fronts, with great anticipation for flood new exciting results. This...
Abstract We report upper limits on the Epoch of Reionization 21 cm power spectrum at redshifts 7.9 and 10.4 with 18 nights data (∼36 hr integration) from Phase I Hydrogen Array (HERA). The show evidence for systematics that can be largely suppressed systematic models down to a dynamic range ∼10 9 respect peak foreground power. This yields 95% confidence limit <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msubsup> <mml:mrow> <mml:mi...
Abstract Recently, the Hydrogen Epoch of Reionization Array (HERA) has produced experiment’s first upper limits on power spectrum 21 cm fluctuations at z ∼ 8 and 10. Here, we use several independent theoretical models to infer constraints intergalactic medium (IGM) galaxies during epoch reionization from these limits. We find that IGM must have been heated above adiabatic-cooling threshold by 8, uncertainties about ionization radio background. Combining HERA with complementary observations...
Abstract We report the most sensitive upper limits to date on 21 cm epoch of reionization power spectrum using 94 nights observing with Phase I Hydrogen Epoch Reionization Array (HERA). Using similar analysis techniques as in previously reported limits, we find at 95% confidence that Δ 2 ( k = 0.34 h Mpc −1 ) ≤ 457 mK z 7.9 and 0.36 3496 10.4, an improvement by a factor 2.1 2.6, respectively. These are mostly consistent thermal noise over wide range after our data quality cuts, despite...
We present a large-scale millimeter continuum map of the Ophiuchus molecular cloud. Nearly 11 deg2, including all area in cloud with AV ≥ 3 mag, was mapped at 1.1 mm Bolocam on Caltech Submillimeter Observatory (CSO). By design, also covers region infrared Spitzer Space Telescope. detect 44 definite sources, and few likely sources are seen along filament eastern streamer. The indicates that dense cores very clustered often found filaments within Most round, as measured half-power point, but...
We have completed a 1.1 mm continuum survey of 7.5 deg2 the Perseus Molecular Cloud using Bolocam at Caltech Submillimeter Observatory. This represents largest millimeter or submillimeter map to date. Our covers more than 30,000 31'' (FWHM) resolution elements 1 σ rms 15 mJy beam-1. detect total 122 cores above 5 point-source mass detection limit 0.18 M☉, assuming dust temperature TD = 10 K, 60 which are new detections. The function is consistent with broken power law slope α1 1.3 (0.5 M☉ <...
We present the Bolocam Galactic Plane Survey (BGPS), a 1.1 mm continuum survey at 33 effective resolution of 170 square degrees visible from northern hemisphere.The BGPS is one first large area, systematic surveys in millimeter without
The six-meter Atacama Cosmology Telescope (ACT) in Chile was built to measure the cosmic microwave background (CMB) at arcminute angular scales. We are building a new polarization sensitive receiver for ACT (ACTPol). ACTPol will characterize gravitational lensing of CMB and aims constrain sum neutrino masses with ~ 0.05 eV precision, running spectral index inflation-induced fluctuations, primordial helium abundance better than 1 %. Our observing fields overlap SDSS BOSS survey optical...
We present a catalog of 8358 sources extracted from images produced by the Bolocam Galactic Plane Survey (BGPS). The BGPS is survey millimeter dust continuum emission northern plane. are using custom algorithm, Bolocat, which was designed specifically to identify and characterize objects in large-area maps generated instrument. products facilitate follow-up observations these relatively unstudied objects. 98% complete 0.4 Jy 60 over all object sizes for sensitive (<35). find that can best be...
We present new observations with the Precision Array for Probing Epoch of Reionization aim measuring properties foreground emission 21 cm epoch reionization (EoR) experiments at 150 MHz. focus on footprint foregrounds in cosmological Fourier space to understand which modes power spectrum will most likely be compromised by emission. These confirm predictions that can isolated a "wedge"-like region two-dimensional (k⊥, k∥)-space, creating window studies higher k∥ values. also find extends past...
Telescopes aiming to measure 21cm emission from the Epoch of Reionization must toe a careful line, balancing need for raw sensitivity against stringent calibration requirements removing bright foregrounds. It is unclear what optimal design achieving both these goals. Via pedagogical derivation an interferometer's response power spectrum reionization fluctuations, we show that even under optimistic scenarios, first-generation arrays will yield low-SNR detections, and different compact array...
The inner 20 × arcmin2 of the COSMOS field was imaged at 250 GHz (1.2 mm) to an rms noise level ~1 mJy per 11'' beam using Max-Planck Millimeter Bolometer Array (MAMBO-2) IRAM 30 m telescope. We detect 15 sources significance between 4 and 7 σ, 11 which are also detected 1.4 with VLA a flux density >24 μJy (3 σ). identify 12 more lower mm based on their association faint radio sources. present multifrequency identifications MAMBO sources, including densities, optical near-infrared...
We present [CII] observations of 20 strongly lensed dusty star forming galaxies at 2.1 < z 5.7 using APEX and Herschel. The sources were selected on their 1.4 mm flux (S_1.4mm > mJy) from the South Pole Telescope survey, with far-infrared (FIR) luminosities determined extensive photometric data. line is robustly detected in 17 sources, all but one being spectrally resolved. Eleven out observed also have low-J CO detections ATCA. A comparison mid- high-J lines ALMA reveals consistent velocity...
We use the Atacama Large Millimeter/submillimeter Array (ALMA) in Cycle 1 to determine spectroscopic redshifts of high-redshift dusty star-forming galaxies (DSFGs) selected by their 1.4mm continuum emission South Pole Telescope (SPT) survey. present ALMA 3mm spectral scans between 84-114GHz for 15 and targeted 1mm observations an additional eight sources. Our yield 30 new line detections from CO, [CI] , [NII] H_2O NH_3. further APEX [CII] CO mid-J seven sources which only a single was...