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http://hdl.handle.net/2289/1576
Title: | Improving pulsar distances by modelling interstellar scattering |
Authors: | Deshpande, A.A. Ramachandran, R. |
Keywords: | SCATTERING, STARS: DISTANCES, STARS: KINEMATICS, PULSARS: GENERAL, ISM: GENERAL, HII REGIONS |
Issue Date: | Oct-1998 |
Publisher: | Blackwell Publishing for the Royal Astronomical Society |
Citation: | Monthly Notices of the Royal Astronomical Society, 1998, Vol.300, p577-582 |
Abstract: | We present here a method to study the distribution of electron density fluctuations in pulsar directions as well as to estimate pulsar distances. The method, based on a simple two-component model of the scattering medium discussed by Gwinn, Bartel & Cordes, uses scintillation and proper motion data in addition to the measurements of angular broadening and temporal broadening to solve for the model parameters, namely, the fractional distance to a discrete scatterer and the associated relative scattering strength. We show how this method can be used to estimate pulsar distances reliably, when the location of a discrete scatterer (e.g. an HII region), if any, is known. Considering the specific example of PSR B0736-40, we illustrate how a simple characterization of the Gum nebula region (using the data on the Vela pulsar) is possible and can be used along with the temporal broadening measurements to estimate pulsar distances. |
Description: | Open Access |
URI: | http://hdl.handle.net/2289/1576 |
ISSN: | 0035-8711 |
Alternative Location: | http://adsabs.harvard.edu/cgi-bin/bib_query?1998MNRAS.300..577D http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998MNRAS.300..577D&link_type=ARTICLE&db_key=AST |
Copyright: | (1998) Royal Astronomical Society |
Appears in Collections: | Research Papers (A&A) |
Files in This Item:
File | Description | Size | Format | |
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1998_MNRAS_Vol.300_p577.pdf | Open Access | 395.62 kB | Adobe PDF | View/Open |
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