Interstellar polarization at high galactic latitudes from distant stars. VI. Extended polarization map and connection with the local spiral structure.

Details Interstellar polarization at high galactic latitudes from distant stars. VI. Extended polarization map and connection with the local spiral structure. Interstellar polarization at high galactic latitudes from distant stars. VI. Extended polarization map and connection with the local spiral structure.

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...384.1050b&link_type=abstract

Astronomy and Astrophysics, Vol. 384, p. 1050-1053 (2002)

Astronomy and Astrophysics

Astrophysics

5

Polarization, Ism: Dust, Extinction, Galaxy: Structure, Galaxy: General

Scientific paper

We present new interstellar polarization measurements for 116 stars at high galactic latitudes. Our data show that Markkanen's cloud -- the main polarization structure seen in the North Galactic Pole area (b > 75 degr) extends further towards lower latitudes. Especially, we have found a new dust formation in the area 35 degr < l < 45 degr, 57 degr < b < 63 degr. Interstellar polarization in this part of the sky peaks at 0.7%, which gives a lower limit to the extinction AV > 0.23m. Polarization vectors in this cloud are very well aligned along the direction of l = 50 degr. On the IRAS 100 micron map this dust structure shows up as a bright emission area. We discuss the new polarization map extending from circumpolar to lower latitudes and point out features which suggest that Markkanen's cloud may be a part of the dust lane in the inner edge of the local spiral or spur.

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