J. J. Broderick

ORCID: 0000-0002-9361-2350
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About
Contact & Profiles
Research Areas
  • Radio Astronomy Observations and Technology
  • Astrophysics and Cosmic Phenomena
  • Astronomical Observations and Instrumentation
  • Astronomy and Astrophysical Research
  • Geophysics and Gravity Measurements
  • Galaxies: Formation, Evolution, Phenomena
  • Pulsars and Gravitational Waves Research
  • GNSS positioning and interference
  • Gamma-ray bursts and supernovae
  • Scientific Research and Discoveries
  • Astrophysical Phenomena and Observations
  • Particle accelerators and beam dynamics
  • Superconducting and THz Device Technology
  • Atomic and Subatomic Physics Research
  • Ionosphere and magnetosphere dynamics
  • Stellar, planetary, and galactic studies
  • Policing Practices and Perceptions
  • Particle Accelerators and Free-Electron Lasers
  • Cosmology and Gravitation Theories
  • Adaptive optics and wavefront sensing
  • Solar and Space Plasma Dynamics
  • Advanced Electrical Measurement Techniques
  • History and Developments in Astronomy
  • Housing, Finance, and Neoliberalism
  • Radio Wave Propagation Studies

Virginia Tech
1987-2022

Wright State University
2022

University of Cincinnati Medical Center
2019

Cincinnati Children's Hospital Medical Center
2019

Stonehill College
1988-2010

National Radio Astronomy Observatory
1971-1996

University of Puerto Rico at Río Piedras
1984

Library of Congress
1976

Arecibo Observatory
1974

Information Technology Institute
1972

The NRAO VLA Sky Survey (NVSS) covers the sky north of J2000.0 δ = -40° (82% celestial sphere) at 1.4 GHz. principal data products are (1) a set 2326 4° × continuum "cubes" with three planes containing Stokes I, Q, and U images plus (2) catalog almost 2 106 discrete sources stronger than S ≈ 2.5 mJy. all have θ 45'' FWHM resolution nearly uniform sensitivity. Their rms brightness fluctuations σ 0.45 mJy beam-1 0.14 K (Stokes I) 0.29 0.09 Q U). uncertainties in right ascension declination...

10.1086/300337 article EN The Astronomical Journal 1998-05-01

Galaxies from the entire Uppsala Galaxy Catalog (UGC) have been identified with 4583 radio sources stronger than 2.5 mJy at 1.4 GHz NRAO VLA Sky Survey (NVSS). The complete sample of 3398 galaxies brighter mp = 14.5 in area defined by δ > -2°30' and |b| 20° yielded UGC/NVSS 1966 sources. Their dominant energy were classified as stars (85%) or active galactic nuclei (15%). luminosity function star-forming agrees well far-infrared (FIR) converted to FIR/radio correlation. spectral power...

10.1086/341650 article EN The Astronomical Journal 2002-08-01

view Abstract Citations (225) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Small-Scale Structure of Radio Galaxies and Quasi-Stellar Sources at 3.8 Centimeters Cohen, M. H. ; Cannon, W. Purcell, G. Shaffer, D. B. Broderick, J. Kellermann, K. I. Jauncey, L. We have observed fringes from 31 compact radio sources, including eight known or suspected galaxies 20 QSSs, by using the Goldstack interferometer X = cm / 108). Fringe visibility curves...

10.1086/151204 article EN The Astrophysical Journal 1971-12-01

The NRAO seven-beam receiver was used on the 91 m telescope in Green Bank, WV during 1986 November to survey declination band 0^deg^<δ<+75^deg^ at 4.85 GHz. We made sky maps from data alone, primarily for comparison with epoch 1987 [Condon et al., AJ, 97, 1064(1989)] allow variability studies of a large, unbiased sample sources selected and sets were combined, reedited, mapped yield fully covering {OMEGA} = 6.07 sr region 0^deg^ < δ +75^deg^ noise position uncertainties divided by nearly...

10.1086/116992 article EN The Astronomical Journal 1994-05-01

The new seven beam receiver and lateral-focus corrector were used on the NRAO 91 m telescope during 1987 October to make a total-power survey of declination band 0^deg^ &lt; δ + 75^deg^ at 4.85 GHz. data reduced with AIPS yield sky maps covering 6.0 sr 3.7 arcmin X 3.3 resolution (10^6^ beams sr^-1^). rms map noise is ~5 mJy, about five times greater than confusion level. There are 10^4^ sources sr^-1^ stronger 25 their position uncertainties in each coordinate range from 10 arcsec for 30...

10.1086/115049 article EN The Astronomical Journal 1989-04-01

Background and objectives Provision of kidney replacement therapy (KRT) to manage injury volume overload in critically ill neonates small children is technically challenging. The use machines designed for adult-sized patients, necessitates large catheters, a high extracorporeal relative patient size, need blood priming. Aquadex FlexFlow System (CHF Solutions Inc., Eden Prairie, MN) an ultrafiltration device fluid removal adults with diuretic resistant heart failure. It has 33 ml, which can...

10.2215/cjn.03240319 article EN Clinical Journal of the American Society of Nephrology 2019-08-28

We cross-identified the ROSAT Bright Source Catalog (RBSC) and NRAO VLA Sky Survey (NVSS) to construct RBSC-NVSS sample of brightest X-ray sources (≥0.1 counts s-1∼10-12 ergs cm-2 s-1 in 0.1-2.4 keV band) that are also radio (S ≥ 2.5 mJy at 1.4 GHz) 7.8 sr extragalactic sky with |b| > 15° δ -40°. The density NVSS is low enough they can be reliably identified RBSC having rms positional uncertainties ≥10''. used more accurate positions make reliable X-ray/radio/optical identifications down...

10.1086/313425 article EN The Astrophysical Journal Supplement Series 2000-08-01

UGC galaxies in the declination band + 5^deg^<δ<+75^deg^ were identified by position coincidence with radio sources stronger than 25 mJy on Green Bank 4.85 GHz sky maps. Candidate identifications confirmed or rejected aid of published aperture-synthesis maps and new 4.86 VLA having 15 18 arcsec resolution, resulting a sample 347 nearby plus five quasar-galaxy pairs. The energy classified as "starbursts" "monsters" basis their infrared-radio flux ratios, infrared spectral indices,...

10.1086/115692 article EN The Astronomical Journal 1991-02-01

Radio identifications of galaxies in the Uppsala General Catalogue Galaxies with δ < +82^deg^ were made from Green Bank 1400 MHz sky maps. Every source having peak flux density S_P_ >= 150 mJy ~12 arcmin FWHM map point-source response and position 5 both coordinates optical any UGC galaxy was considered a candidate identification to ensure that very extended (up 1 Mpc) asymmetric sources would not be missed. Maps literature or new 1.49 GHz VLA C array maps 18 arcsec resolution used confirm...

10.1086/114788 article EN The Astronomical Journal 1988-07-01

Extragalactic sources detected at λ= 60 microns were selected from the IRAS Faint Source Catalog, Version 2 by criterion S_60 microns_ >= S_12_ microns. They identified position coincidence with radio stronger than 25 mJy 4.85 GHz in 6.0 sr declination band 0^deg^ < δ +75^deg^ (excluding 0.05 region 12^h^40^m^< α 14^h^40^m^, 0^deg^< +5^deg^) and 80 3.4 area o^h^ <α 2o^h^, -40^deg^ (plus 12^h^40^m^ 0^deg^<δ <+5^deg^). Fields containing new candidate identifications mapped VLA 4.86 about 15"...

10.1086/117454 article EN The Astronomical Journal 1995-06-01

view Abstract Citations (51) References (13) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS First-Epoch Radio Observations of Supernova 1970g Gottesman, S. T. ; Broderick, J. Brown, Robert L. Balick, Bruce Palmer, Patrick observations the supernova which occurred in galaxy M101 have been made at wavelengths 11.1 and 3.7 cm over a 9-month interval revealed pointlike source with an intensity 4 X 10- W . The agreement position this is excellent. An extended...

10.1086/151497 article EN The Astrophysical Journal 1972-06-01

view Abstract Citations (61) References (45) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Radio Properties of Extragaglctic IRAS Sources Condon, J. ; Broderick, Extragalactic sources with S_60 microns_ =>0.2 Jy and ホア (12 microns, 60 microns)=> 0 from the Faint Source Catalog Version 1 covering |b| > 50^deg^ were identified by position coincidence radio stronger than S = 25 mJy lying north ホエ + 5^deg^ on Green Bank 4.85 GHz sky maps. There are N= 7702...

10.1086/115986 article EN The Astronomical Journal 1991-11-01

view Abstract Citations (54) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS 3C 286: a cosmological QSO? Wolfe, A. M. ; Broderick, J. Condon, Johnston, K. Very-long-baseline (VLB) interferometer observations of the 839-MHz absorption line in QSO 286 were made. The absorbing region was resolved and is at least 0.02 arcsec across, independent any continuum brightness distribution model. observed amplitude phase spectra decomposed into two...

10.1086/182230 article EN The Astrophysical Journal 1976-09-01

The NRAO 91 m transit telescope and rebuilt four-feed receiver were used to make a 1400 MHz continuum survey covering -5 deg less than delta +82 with 12.7 arcmin x 11.1 resolution. Maps of the right ascension range 7h 30m alpha 19h (= 3.4 sr) have been produced, 100 baselines subtracted reveal point sources, while suppressing galactic structures extending more about 1 in declination. These maps contain 3000 sources per sr stronger 0.15 Jy, which is six times rms extragalactic confusion ten...

10.1086/113959 article EN The Astronomical Journal 1985-12-01

A confusion-limited 4.755-GHz survey covering 0.00956 sr between right ascensions 07h05m and 18h near declination +35 deg has been made with the NRAO 91-m telescope. The found 237 sources is complete above 15 mJy. Source counts 100 mJy were obtained directly. P(D) distribution was used to determine number 0.5 13.2 mJy, search for anisotropy in density of faint extragalactic sources, set a 99%-confidence upper limit 1.83 mK rms temperature fluctuation 2.7-K cosmic microwave background on...

10.1086/112740 article EN The Astronomical Journal 1980-07-01

The NRAO 91 m transit telescope and rebuilt four-feed receiver were used to make a 1400 MHz continuum survey with 12.7 arcmin x 11.1 resolution. New maps covering ascension between 19 h 30 7 supplement those in the right range (Condon Broderick, 1985) complete roughly 6.8 sr declination band -5 deg +82 deg. Both sets of are confusion-limited contain 3000 sources per stronger than 0.15 Jy. They available on FITS tapes can be displayed analyzed standard AIPS programs. A procedure for making...

10.1086/114081 article EN The Astronomical Journal 1986-05-01

view Abstract Citations (55) References (29) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A comprehensive radio study of the z = 0.524 absorption system in AO 0235+164. Wolfe, A. M. ; Broderick, J. Condon, Johnston, K. We present pencil-beam and VLB observations 932 MHz line continuum BL Lacertae object 0235+164, its 318 430 continuum. find that this redshifted (z 0.524) 21 em consists many narrow components with r > 0.002 are spread over a velocity range...

10.1086/156195 article EN The Astrophysical Journal 1978-06-01

view Abstract Citations (31) References (29) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Very Long Baseline Interferometer Observations of Taurus a and Other Sources at 121.6 MHz Erickson, W. C. ; Kuiper, T. B. H. Clark, A. Knowles, S. Broderick, J. VLBI observations with an antenna spacing 92,000 A (2'(2 lobe separation) were made on number small-angular-diameter sources frequency MHz. Through positional spectral coincidence, these confirm the physical...

10.1086/151689 article EN The Astrophysical Journal 1972-10-01

We identified 15,658 NVSS radio sources among the 55,288 2MASX galaxies brighter than $k_\mathrm{20fe} = 12.25$ at $\lambda 2.16\,\mu\mathrm{m}$ and covering $\Omega =7.016$ sr of sky defined by J2000 $\delta > -40^\circ$ $\vert b \vert 20^\circ$. The complete sample 15,043 with 1.4 GHz flux densities $S \geq 2.45 \mathrm{~mJy}$ contains a 99.9% spectroscopically subsample 9,517 \leq 11.75$. used only infrared data to quantitatively distinguish powered primarily recent star formation from...

10.3847/1538-4357/ab0301 article EN The Astrophysical Journal 2019-02-20

A 4.85-GHz continuum sky survey of the area delta = -40 to +5 deg and alpha 0-20 h made during January-March 1990 is presented. The data were reduced with AIPS yield total-intensity maps covering Omega about 3.8 sr theta 7 arcmin FWHM resolution (about 2 exp 5 beams/sr); rms map noise plus confusion 3 mJy/beam. position uncertainties on vary from 25 arcsec for strongest sources 50 at S 5(sigma).

10.1086/116026 article EN The Astronomical Journal 1991-12-01

view Abstract Citations (39) References (53) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Multifrequency light-curves of low-frequency variable radio sources. Altschuler, D. R. ; Broderick, J. Condon, Dennison, B. Mitchell, K. O'Dell, S. L. Payne, H. E. Light curves for the sources AO 0235 + 16, NRAO 140, PKS 1117 14, DA 406, CTA 102, and 3C 454.3, obtained in monthly observations at 318, 430, 606 MHz using 305-m telescope Arecibo bimonthly 880 1.4 GHz...

10.1086/113687 article EN The Astronomical Journal 1984-12-01
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