- ID:
- ivo://CDS.VizieR/VIII/98
- Title:
- 180MHz Murchison Commissioning Survey (MWACS)
- Short Name:
- VIII/98
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The Murchison Widefield Array Commissioning Survey (MWACS) is a ~6100deg^2^ 104-196MHz radio sky survey performed with the Murchison Widefield Array during instrument commissioning between 2012 September and 2012 December. The data were taken as meridian drift scans with two different 32-antenna sub-arrays that were available during the commissioning period. The data were combined in the visibility plane before being imaged, and then mosaicked. The survey covers approximately 20.5h<RA<8.5h, -58{deg}<Dec<-14{deg} over three frequency bands centred on 119, 150 and 180MHz. The survey has 3arcmin angular resolution and a typical noise level of 40mJy/beam, with reduced sensitivity near the field boundaries and bright sources. The catalogue consists of flux density and spectral index measurements for 14,110 sources, extracted from the mosaics, 1,247 of which are sub-components of complexes of sources.
Number of results to display per page
Search Results
- ID:
- ivo://CDS.VizieR/J/MNRAS/376/1251
- Title:
- 610MHz observations of Spitzer XFLS
- Short Name:
- J/MNRAS/376/1251
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Observations of the Spitzer extragalactic First Look Survey field taken at 610MHz with the Giant Metre-wave Radio Telescope are presented. Seven individual pointings were observed, covering a total area of 4 square degrees with a resolution of 5.8x4.7arcsec^2^, PA=60{deg}. The r.m.s. noise at the centre of the pointings is between 27 and 30uJy before correction for the GMRT primary beam. The techniques used for data reduction and production of a mosaicked image of the region are described, and the final mosaic, along with a catalogue of 3944 sources detected above ~5{sigma} are presented. The survey complements existing radio and infrared data available for this region. For further details of the surveys and data analysis procedures please refer to the published paper.
- ID:
- ivo://CDS.VizieR/J/A+AS/135/273
- Title:
- 408MHz obs. of GPS sources from JVAS survey
- Short Name:
- J/A+AS/135/273
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Observations with MERLIN at 408 MHz have been used to establish the low-frequency part of the spectra of more than a hundred compact radio sources taken from the part of the Jodrell Bank-VLA Astrometric Survey (JVAS) limited by 35{deg}<={delta}<=75{deg}. These sources were selected from JVAS and other catalogues to have convex spectra between 1.4 and 8.4GHz, characteristic of Gigahertz Peaked Spectrum sources. We have confirmed convex shapes of the spectra of 76 objects.
- ID:
- ivo://CDS.VizieR/J/AZh/74/812
- Title:
- 102MHz radio source survey
- Short Name:
- J/AZh/74/812
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- An analysis of 125 radio sources from a 102MHz survey of scintillating sources is presented. These compact (<1") radio sources are identified with radio sources in the most sensitive catalogs currently available. Analysis of the integrated spectra for these objects indicates that the compact sources have steep spectra ({alpha}>0.5). There is a tendency for weaker sources to be more compact. The inferred spectral indices for compact sources in the cores of extended objects are on average lower than the integrated values. The most likely candidates for optical counterparts to the compact radio sources from the scintillating source survey are steep-spectrum quasars.
- ID:
- ivo://CDS.VizieR/J/ApJS/155/89
- Title:
- 325MHz radio survey in M31
- Short Name:
- J/ApJS/155/89
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present here the results of a 325MHz radio survey of M31, conducted with the A configuration of the Very Large Array. The survey covered an area of 7.6{deg}^2^, and a total of 405 radio sources between <~6" and 170" in extent were mapped with a resolution of 6" and a 1{sigma} sensitivity of ~0.6mJy/beam. For each source, its morphological class, major axis {theta}_M_, minor axis {theta}_m_, position angle {theta}_PA_, peak flux I, integrated flux density S, spectral index {alpha}, and spectral curvature parameter {phi} were calculated.
- ID:
- ivo://CDS.VizieR/J/ApJS/159/242
- Title:
- 325MHz radio survey in M31. II.
- Short Name:
- J/ApJS/159/242
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have previously presented the results of a 325MHz radio survey of M31 (Cat. <J/ApJS/155/89>, conducted with the A configuration of the Very Large Array. In this survey, a total of 405 radio sources between <~6" and 170" in extent were mapped with a resolution of 6" and a sensitivity of ~0.6mJy/beam. Here we compare the resultant source list and image with other radio, IR, optical, and X-ray observations and catalogs of the region.
- ID:
- ivo://CDS.VizieR/J/ApJ/846/L19
- Title:
- 115-155MHz radio survey of Fermi sources
- Short Name:
- J/ApJ/846/L19
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Using LOFAR, we have performed a very-low-frequency (115-155MHz) radio survey for millisecond pulsars (MSPs). The survey targeted 52 unidentified Fermi {gamma}-ray sources. Employing a combination of coherent and incoherent dedispersion, we have mitigated the dispersive effects of the interstellar medium while maintaining sensitivity to fast-spinning pulsars. Toward 3FGLJ1553.1+5437 we have found PSRJ1552+5437, the first MSP to be discovered (through its pulsations) at a radio frequency <200MHz. PSR J1552+5437 is an isolated MSP with a 2.43ms spin period and a dispersion measure of 22.9pc/cm^3^. The pulsar has a very steep radio spectral index ({alpha}-2.8+/-0.4). We obtain a phase-connected timing solution combining the 0.74yr of radio observations with {gamma}-ray photon arrival times covering 7.5yr of Fermi observations. We find that the radio and {gamma}-ray pulse profiles of PSR J1552+5437 appear to be nearly aligned. The very steep spectrum of PSR J1552+5437, along with other recent discoveries, hints at a population of radio MSPs that have been missed in surveys using higher observing frequencies. Detecting such steep spectrum sources is important for mapping the population of MSPs down to the shortest spin periods, understanding their emission in comparison to slow pulsars, and quantifying the prospects for future surveys with low-frequency radio telescopes like SKA-Low and its precursors.
- ID:
- ivo://CDS.VizieR/VIII/6
- Title:
- 1400-MHz Sky Survey, Maps Covering Dec -5 to +82
- Short Name:
- VIII/6
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The survey contains 144 maps that cover the declination zone -5 to +82 degrees from the National Radio Astronomy Observatory (NRAO) 1400-MHz survey. The observations were made during 1983 April 2-21, and in October 1983, with the rebuilt four-feed receiver on the NRAO 91-m transit telescope in Green Bank. Its resolution is 12.7x11.1 arcmin. These maps with a pixel size of 2x2arcmin contain 3000 sources per sr stronger than 0.15 Jy, which is six times the rms noise. They are available in the Flexible Image Transport System (FITS) standard (in the "maps" subdirectory) and can be studied with standard Astronomical Image Processing System (AIPS) display and analysis programs.
- ID:
- ivo://CDS.VizieR/J/ApJ/734/L34
- Title:
- 145MHz source measurements by PAPER
- Short Name:
- J/ApJ/734/L34
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present observations from the Precision Array for Probing the Epoch of Reionization (PAPER) in South Africa, observed in 2010 May and September. Using two nights of drift scanning with PAPER's 60{deg} FWHM beam we have made a map covering the entire sky below +10{deg} declination with an effective center frequency of 145MHz, a 70MHz bandwidth, and a resolution of 26'. A 4800deg^2^ region of this large map with the lowest Galactic emission reaches an rms of 0.7Jy. We establish an absolute flux scale using sources from the 160MHz Culgoora catalog (Cat. VIII/35). Using the 408MHz Molonglo Reference Catalog (MRC, Cat. VIII/16) as a finding survey, we identify counterparts to 480 sources in our maps and compare our fluxes to the MRC and to 332 sources in the Culgoora catalog. For both catalogs, the ratio of PAPER to catalog flux averages to 1, with a standard deviation of 50%. This measured variation is consistent with comparisons between independent catalogs observed at different bands. The PAPER data represent new 145MHz flux measurements for a large number of sources in the band expected to encompass cosmic reionization and represents a significant step toward establishing a model for removing foregrounds to the reionization signal.
- ID:
- ivo://CDS.VizieR/J/A+AS/97/435
- Title:
- 1410MHz-spectra of quasars III.
- Short Name:
- J/A+AS/97/435
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the third and final part of the research at 1410MHz for 213 extragalactic objects from the Southern Hemisphere identified as Quasars by Veron-Cetty and Veron (1983A&AS...53..219V). The first (1988A&AS...76...21Q) and second (1990A&AS...83..393Q) parts contained measurement of the flux densities at 1410MHz for 473 sources.
