2005A&A...433..827M


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.19CET17:08:01

2005A&A...433..827M - Astronomy and Astrophysics, volume 433, 827-840 (2005/4-3)

Scintillation-induced variability in radio absorption spectra against extragalactic sources.

MacQUART J.-P.

Abstract (from CDS):

Spectral features absorbed against some radio quasars exhibit ∼50mJy variations, with the lines varying both relative to the continuum and, when several lines are present, even relative to one another. We point out that such variability can be expected as a consequence of refractive scintillation caused by the interstellar medium of our Galaxy. Scintillation can cause independent variations between closely-spaced spectral lines, and can even alter the line profile. The background source need not be compact to exhibit spectral variability. The variability can be used to infer the parsec to sub-parsec scale structure of the intervening absorbing material. We discuss the importance of scintillation relative to other possible origins of spectral variability. The present theory is applied to account for the variations observed in the HI-absorbed quasar PKS 1127-145.

Abstract Copyright:

Journal keyword(s): radio lines: galaxies - Galaxy: structure - scattering - techniques: high angular resolution

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9649 1
2 QSO B0235+1624 BLL 02 38 38.93010 +16 36 59.2746   16.46 15.50 15.92   ~ 1405 2
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15113 1
4 QSO J1130-1449 QSO 11 30 07.05259287 -14 49 27.3881476   17.17 16.90 16 16.97 ~ 637 1

    Equat.    Gal    SGal    Ecl

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2021.01.19-17:08:01

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