- 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.
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Search Results
- 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.
1075. 102.5MHz Survey
- ID:
- ivo://CDS.VizieR/J/AZh/77/21
- Title:
- 102.5MHz Survey
- Short Name:
- J/AZh/77/21
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The results of observations on the Large Phased Array of the Lebedev Physical Institute made as part of a survey of northern sky at 102.5 MHz are reported. Survey source lists for declination ranges 27.5-33.5 deg. and 67.5-70.5 deg. are given, together with their coordinates, flux densities and identifications with 4C objects. In total, there are 920 sources with flux densities S(102.5)>=3.0 Jy in the two zones, which cover over 0.73 steradians.
- ID:
- ivo://CDS.VizieR/VIII/29A
- Title:
- 1400-MHz Survey of 1478 Abell Clusters of Galaxies
- Short Name:
- VIII/29A
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This catalog contains observations of Abell clusters of galaxies which were obtained with the Green Bank 91-m telescope at 1400 MHz with an angular resolution of 10'x11' (RAxDEC). This catalog extends the sample of clusters originally published in Owen (1974AJ.....79..427O). The primary goals of this survey were to observe all Abell (1958ApJS....3..211A, Cat. VII/4) clusters with m10 (magnitude of the tenth brightest galaxy in the cluster) less than or equal to 17.0 and declinations north of -19 degrees, to observe all clusters with richness>=3 regardless of m10, and to obtain observations of a representative sample of the rest of the catalog (m10>=17.0; richness<=2). The abelclus.dat file contains ALL 957 detected sources (also beyond 0.5 corrected Abell radii). It contains 525 sources within 0.5 corrected Abell radii, while the published table1.dat file contains 487 entries corresponding to 485 distinct sources (in 442 clusters). The catalog entries contains the flux density at 1400 MHz, the Abell cluster number, richness class, distance class, m10, redshift estimate (z), corrected Abell cluster radius, right ascension (B1950), declination (B1950), deconvolved major and minor source axis lengths, position angle, and distance of the source from the cluster center.
- ID:
- ivo://CDS.VizieR/J/MNRAS/387/1037
- Title:
- 610-MHz survey of Lockman Hole with GMRT
- Short Name:
- J/MNRAS/387/1037
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present observations of the Lockman Hole with the Giant Metrewave Radio Telescope (GMRT). Twelve pointings were observed, covering a total area of ~5deg^2^ with a resolution of 6x5arcsec^2^, position angle +45deg. The majority of the pointings have an rms noise of ~60uJy/beam before correction for the attenuation of the GMRT primary beam. Techniques used for data reduction and production of a mosaicked image of the region are described, and the final mosaic is presented, along with a catalogue of 2845 sources detected above 6{sigma}. Radio source counts are calculated at 610-MHz and combined with existing 1.4-GHz source counts, in order to show that pure luminosity evolution of the local radio luminosity functions for active galactic nuclei and starburst galaxies is sufficient to account for the two source counts simultaneously.
- ID:
- ivo://CDS.VizieR/J/other/BASI/38.103
- Title:
- 610-MHz survey of Lockman Hole with GMRT. II.
- Short Name:
- J/other/BASI/38.
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present further observations of the Lockman Hole field, made with the Giant Metrewave Radio Telescope at 610MHz with a resolution of 6x5arcsec^2^. These complement our earlier observations of the central ~5deg^2^ by covering a further ~8deg^2^, with an r.m.s. noise down to ~80uJy/beam. A catalogue of 4934 radio sources is presented
- ID:
- ivo://CDS.VizieR/VIII/97
- Title:
- 74MHz VLA Low-frequency Sky Survey Redux (VLSSr)
- Short Name:
- VIII/97
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of a recent re-reduction of the data from the Very Large Array (VLA) Low-frequency Sky Survey (VLSS). We used the VLSS catalogue as a sky model to correct the ionospheric distortions in the data and create a new set of sky maps and corresponding catalogue at 73.8MHz. The VLSS Redux (VLSSr) has a resolution of 75", and an average map rms noise level of {sigma}~0.1Jy/beam. The clean bias is 0.66x{sigma} and the theoretical largest angular size is 36'. Six previously unimaged fields are included in the VLSSr, which has an unbroken sky coverage over 9.3sr above an irregular southern boundary. The final catalogue includes 92964 sources. The VLSSr improves upon the original VLSS in a number of areas including imaging of large sources, image sensitivity, and clean bias; however the most critical improvement is the replacement of an inaccurate primary beam correction which caused source flux errors which vary as a function of radius to nearest pointing centre in the VLSS.
- ID:
- ivo://CDS.VizieR/III/214
- Title:
- Michigan Catalogue of HD stars, Vol.5
- Short Name:
- III/214
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This volume of the catalog contains all HD stars in the declination range -12 degrees up to and including +05 degrees (equinox 1900) and is part of a series of catalogs in the University of Michigan program of systematic reclassification in the MK system of the entire "Henry Draper Catalogue" (HD). The stars were classified visually on objective-prism plates taken with the Michigan Curtis Schmidt telescope at Cerro Tololo Inter-American Observatory. The 4{deg} + 6{deg} prisms yield a dispersion at H_{gamma}_ of 108 {AA}/mm, and the average resolution is about 2 {AA}/mm, comparable to that of the original MK system [MKK]. The spectra were taken on IIaO plates and widened to 0.8 mm, with 20min, 4min, and 1min exposures being obtained. In order to maintain a uniform, consistent system, all the spectral classification was done by one person (Houk). It is recommended that users read the accompanying text (preface.tex) before utilizing the catalogue in order to take full advantage of its contents and to learn the notation and practices followed.
