Deep Observations with the Parkes 21-cm Multibeam System
نویسندگان
چکیده
We report on a preliminary analysis of a 5600 sec per point survey of 32 square degrees in Centaurus, carried out with the Parkes 13-beam system. The signal-to-noise ratio is found to improve as √ tobs for the whole integration. We have detected 102 HI sources between +250 and +12,700 km s−1 either by eye or by using the new galaxy-finding algorithm PICASSO. Over half of these are new HI detections. Around a dozen of these are not associated with catalogued galaxies and, in two of these cases, we have not identified an optical counterpart on the Digitized Sky Survey. Arguments are put forward to explain why deep integrations are needed to find low surface brightness objects.
منابع مشابه
HI Surveys with FAST and ASKAP
Surveys of galaxies in the 21-cm line of neutral hydrogen are important parts of the science case for the Five-hundred-metre Aperture Spherical Telescope (FAST) and the Australian SKA Pathfinder (ASKAP). The FAST strawman design with 19 beams and low system temperature allows a “survey speed” comparable to that of ASKAP. The combination of the two telescopes will allow a shallow all-sky survey ...
متن کاملRealtime, Object-oriented Reduction of Parkes Multibeam Data using AIPS++
An overview of the Australia Telescope National Facility (ATNF) Parkes Multibeam Software is presented. The new thirteen-beam Parkes 21 cm Multibeam Receiver is being used for the neutral hydrogen (Hi) Parkes All Sky Survey (HIPASS). This survey will search the entire southern sky for Hi in the redshift range −1200 km s−1 to +12600 km s−1; with a limiting column density of NHi ' 5× 1017 cm−2. O...
متن کاملar X iv : a st ro - p h / 02 11 28 8 v 1 1 3 N ov 2 00 2 WHERE HAS ALL THE NEUTRAL HYDROGEN GONE ?
Our extremely deep survey for extragalactic Hi (HIDEEP) finds no in-tergalactic gas clouds, and no galaxies with Hi at inferred global column-densities below 10 20 cm −2 when we could have detected such objects down to a completeness limit of 4 × 10 18 cm −2. We speculate that low surface-density hydrogen is either ionised or locked up in " frozen discs " , i.e. structures where the local Ly-α ...
متن کاملDevelopment of an Ultra - Wideband ( UWL ) Receiver System at Parkes
• Installation of a wideband " UWL " receiver covering the band 0.7 GHz to 4.0 GHz on the Parkes 64-m telescope, together with the 20cm Multibeam receiver, would allow more than 90% of current Parkes observations to be made with no receiver changes, greatly improving the efficiency of Parkes operations. • The digital receiver system could be configured for all types of pulsar observation (excep...
متن کاملThe Parkes multibeam pulsar survey: VI. Discovery and timing of 142 pulsars and a Galactic population analysis
We present the discovery and follow-up observations of 142 pulsars found in the Parkes 20-cm multibeam pulsar survey of the Galactic plane. These new discoveries bring the total number of pulsars found by the survey to 742. In addition to tabulating spin and astrometric parameters, along with pulse width and flux density information, we present orbital characteristics for 13 binary pulsars whic...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1998