Extinction in NGC 628 and NGC 2403 derived from Paschen and Balmer lines.

Details Extinction in NGC 628 and NGC 2403 derived from Paschen and Balmer lines. Extinction in NGC 628 and NGC 2403 derived from Paschen and Balmer lines.

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...308...49p&link_type=abstract

Astronomy and Astrophysics, v.308, p.49-54

Astronomy and Astrophysics

Astrophysics

12

Galaxies: Spiral, Galaxies: Ism, Dust, Extinction, Hii Regions, Galaxies: Ngc 628, Ngc 2403

Scientific paper

Long-slit spectrophotometry obtained simultaneously in the spectral ranges λλ3950-4900A and 8000-10500A is presented for a number of giant extragalactic HII regions (GEHRs) in the spiral galaxies NGC 628 and NGC 2403. These ranges include lines from the Balmer and Paschen series of hydrogen separated by a wide wavelength interval. The Paschen and Balmer lines with special emphasis on the corresponding multiplet lines Pδ/Hɛ are used to examine the dust extinction towards the GEHRs in these galaxies. We find good internal consistency for the observed/predicted line ratios used for derivation of the visual extinction, A_V_. Our results for A_V_ are in general larger than previously published values based on the Hα/ Hβ ratio with the GEHRs in NGC 628 exhibiting the largest extinction.

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