- 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.
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- 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.
994. 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/J/ApJS/107/239
- Title:
- 327MHz survey of the galactic plane
- Short Name:
- J/ApJS/107/239
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- (from the authors) The Westerbork Synthesis Radio Telescope (WSRT) in the Netherlands has been used to survey a section of the galactic plane at a radio frequency of 327MHz. Twenty-three overlapping synthesis fields were observed, covering galactic co-ordinates 43{deg}<l<91{deg}, |b|<1.6{deg}. Each field was observed at two epochs, several years apart, to identify variable sources. Intensity data from the separate epochs were combined, and the resulting images mosaiced to produce a single image of the entire survey region. Sensitivity of the mosaic is typically a few mJy. Resolution is 1' by 1'cosec(dec). The survey image provides our first high resolution view of the Galaxy at low radio frequencies, and includes sections of the Sagittarius and Cygnus arms. These sections contain numerous extended features, among them supernova remnants, HII regions, "bubbles" of thermal emission, and large patches of amorphous galactic thermal emission. The inter-arm region is characterized by lower densities of extended features, but numerous discrete compact radio sources, most of which are background objects such as quasars and other types of active galactic nuclei. However, the resolution, sensitivity and low frequency of this survey make it ideal for detecting weak, non-thermal compact galactic sources, e.g. compact, low surface brightness SNRs and radio stars. Inspection of the survey image has produced a catalog of nearly 4000 discrete sources with sizes less than about 3'.
- ID:
- ivo://CDS.VizieR/J/ApJS/255/28
- Title:
- ~420MHz uGMRT obs. of MIR selected radio-loud AGN
- Short Name:
- J/ApJS/255/28
- Date:
- 11 Mar 2022
- Publisher:
- CDS
- Description:
- We present results from a spectroscopically blind search for associated and intervening HI 21cm and OH 18cm absorption lines toward 88 active galactic nuclei (AGN) at 2<z<5 using the uGMRT. The sample of AGN with 1.4GHz spectral luminosity in the range 10^27-29.3^W/Hz is selected using mid-infrared colors and closely resembles the distribution of the underlying quasar population. The search for associated or proximate absorption, defined to be within 3000km/s of the AGN redshift, led to one HI 21cm absorption detection (M1540-1453; z_abs_=2.1139). This is only the fourth known absorption at z>2. The detection rate (1.6_-1.4_^+3.8^%) suggests a low covering factor of the cold neutral medium (CNM; T~100K) associated with these powerful AGN. The intervening absorption line search, with a sensitivity to detect the CNM in damped Ly{alpha} systems (DLAs), has comoving absorption path lengths of {Delta}X=130.1 and 167.7 for HI and OH, respectively. The corresponding number of absorbers per unit comoving path length are <=0.014 and <=0.011, respectively. The former is at least 4.5 times lower than that of DLAs and consistent with the CNM cross section estimated using H_2_ and CI absorbers at z>2. Our AGN sample is optically fainter compared to the quasars used to search for DLAs in the past. In our optical spectra obtained using SALT and NOT, we detect five intervening (redshift path ~9.3) and two proximate DLAs. This is slightly excessive compared to the statistics based on optically selected quasars. The nondetection of HI 21cm absorption from these DLAs suggests a small CNM covering fraction around galaxies at z>2.
- ID:
- ivo://CDS.VizieR/J/MNRAS/301/203
- Title:
- 408-MHz variability study
- Short Name:
- J/MNRAS/301/203
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Variability in 408MHz flux density, over a 1yr interval between 1995 and 1996, has been investigated using the DRAO Synthesis Telescope for a complete sample of 322 sources with S(408MHz)>80mJy at galactic b=15{deg}; four sources are found to show significant flux density variations.
