Effects of Dust on Gravitational Lensing by Spiral Galaxies | Zendy

Rosalba Perna | Zendy; Abraham Loeb | Zendy; Matthias Bartelmann | Zendy

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Effects of Dust on Gravitational Lensing by Spiral Galaxies

Author(s) -

Rosalba Perna,

Abraham Loeb,

Matthias Bartelmann

Publication year - 1997

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/304712

Subject(s) - physics , astrophysics , qsos , gravitational lens , spiral galaxy , galaxy , redshift , milky way , astronomy , quasar , strong gravitational lensing , line of sight

Gravitational lensing of an optical QSO by a spiral galaxy is oftencounteracted by dust obscuration, since the line-of-sight to the QSO passesclose to the center of the galactic disk. The dust in the lens is likely to becorrelated with neutral hydrogen, which in turn should leave a Lyman-alphaabsorption signature on the QSO spectrum. We use the estimated dust-to-gasratio of the Milky-Way galaxy as a mean and allow a spread in its values tocalculate the effects of dust on lensing by low redshift spiral galaxies. Usinga no-evolution model for spirals at z<1 we find (in Lambda=0 cosmologies) thatthe magnification bias due to lensing is stronger than dust obscuration for QSOsamples with a magnitude limit B<16. The density parameter of neutral hydrogen,Omega_HI, is overestimated in such samples and is underestimated for fainterQSOs.Comment: 18 pages, 4 figures, ApJ, in pres

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