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Arecibo H I absorption measurements of pulsars and the electron density at intermediate longitudes in the first galactic quadrant

Weisberg, J. M. and Stanimirovíc, S. and Xilouris, K. (2008) Arecibo H I absorption measurements of pulsars and the electron density at intermediate longitudes in the first galactic quadrant. Astrophysical Journal, 674 . pp. 286-294. ISSN 0004-637X. doi:10.1086/523345.

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We have used the Arecibo telescope to measure the H i absorption spectra of eight pulsars. We show how kinematic distance measurements depend on the values of the Galactic constants R_0 and θ_0 , and we select our preferred current values from the literature. We then derive kinematic distances for the low-latitude pulsars in our sample and electron densities along their lines of sight. We combine these measurements with all others in the inner Galactic plane visible from Arecibo to study the electron density in this region. The electron density in the interarm range 48° ‹l ‹70° is 0.017^(+0.012)_(-0.007)(68% c.l.) cm^(−3). This is 0.75^(+0.49)_(-0.22(68% c.l) of the value calculated by the Galactic electron density model of Cordes & Lazio. The model agrees more closely with electron density measurements toward Arecibo pulsars lying closer to the Galactic center, at 30° ‹l ‹ 48° . Our analysis leads to the best current estimate of the distance of the relativistic binary pulsar B1913+16:d = 9.0 ± 3 kpc. We use the high-latitude pulsars to search for small-scale structure in the interstellar hydrogen observed in absorption over multiple epochs. PSR B0301+19 exhibited significant changes in its absorption spectrum over 22 yr, indicating H i structure on a ~500 AU scale.

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Additional Information:© 2008. The American Astronomical Society. Received 2007 January 6; accepted 2007 September 10. J. M.W.,A.H., andA. F.were supported by grantAST 04-06832 from the National Science Foundation.
Funding AgencyGrant Number
NSFAST 04-06832
Subject Keywords:Galaxy: fundamental parameters ISM: abundances ISM: clouds ISM: structure pulsars: general — radio lines: ISM
Record Number:CaltechAUTHORS:20090730-093305799
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Official Citation:Arecibo H I Absorption Measurements of Pulsars and the Electron Density at Intermediate Longitudes in the First Galactic Quadrant J. M. Weisberg, S. Stanimirović, K. Xilouris, A. Hedden, A. de la Fuente, S. B. Anderson, and F. A. Jenet 2008 ApJ 674 286-294 doi: 10.1086/523345
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14736
Deposited By: Ruth Sustaita
Deposited On:26 Aug 2009 23:49
Last Modified:08 Nov 2021 23:14

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