A Wide Field, Low Frequency Radio Survey of the Field of M31: I. Construction and Statistical Analysis of the Source Catalog
نویسندگان
چکیده
We present here the results of a 325 MHz radio survey of M31, conducted with the A-configuration of the Very Large Array. The survey covered an area of 7.6 deg, and a total of 405 radio sources between .6 and 170 in extent were mapped with a resolution of 6 and a 1σ sensitivity of ∼0.6 mJy beam. For each source, its morphological class, major axis θM , minor axis θm, position angle θPA, peak flux I, integrated flux density S, spectral index α and spectral curvature parameter φ were calculated. A comparison of the flux and radial distribution – both in the plane of the sky and in the plane of M31 – of these sources with those of the XMM–LSS and WENSS radio surveys revealed that a vast majority of sources detected are background radio galaxies. As a result of this analysis, we expect that only a few sources are intrinsic to M31. These sources are identified and discussed in an accompanying paper. Subject headings: catalogs — galaxies: individual (M31) — radio continuum: general — radio continuum: galaxies
منابع مشابه
Survey on Media Literacy of Radio and Television Program Producers (Case study: Mazandaran Radio and Television Center)
In the recent decades, advanced technologies in production, infrastructure and devices for providing content and services have been provided. The audience can use the media of their interest at any time, with the desired devices .Accordingly, there are many differences in the level of media literacy of the people. This study seeks to determine the level of media literacy of the producer of pro...
متن کاملThe Measurement of Low Frequency Magnetic Field of Two Kinds of GSM900 Mobile Phone
Introduction: The use of mobile communication systems has dramatically increased over the past decade. Although many studies have been performed to determine the effect of radio frequency (RF) but less attention has been paid to the possible biological impact of exposure to extremely low frequency (ELF) components. The objective of this study is two folds. One is to design the ...
متن کاملAnalysis of Low-Frequency Passive Seismic Attributes in Maroun Oil Field, Iran
Nowadays, viable and cost-effective methods play a vital role in hydrocarbon exploration up to the point that geoscientists cannot rule out the importance of the passive seismic method (PSM) in oil exploration operations. This method is based on seismic energy, which has a natural source. This study focuses on seismic energy anomaly of 1-6 Hz. Some researches show that spectral and polarization...
متن کاملField Study and Evaluation of Buckling Behavior of Cylindrical Steel Tanks with Geometric Imperfections under Uniform External Pressure
Construction and assembling process of shell structures has caused main problems. In these structures, there is no possibility for the integrated construction due to their large shell extent and they are built using a number of welded curved panel parts; hence, some geometrical imperfections emerge. Most of these imperfections are caused by the process of welding, transportation, inappropriate ...
متن کاملA Strong Ground Motion Catalogue of Selected Records for Shallow Crustal, Near Field Earthquakes in Iran
Understanding strong ground motions in the near-fault areas is important for seismic risk assessment in densely populated areas. In the past, lack of information on strong ground motion for large and moderate earthquakes led to the use of mainly far field large and moderate earthquake records in equations for calculation of the strong ground motion parameters. In this article, we collected and ...
متن کامل