1997A&A...323..697P

Query : 1997A&A...323..697P

1997A&A...323..697P - Astronomy and Astrophysics, volume 323697-706 (1997/7-3)

Dust extinction of HII regions in NGC 598 and NGC 5457.

PETERSEN L. and GAMMELGAARD P.

Abstract (from CDS):

The dust extinction towards bright HII regions in NGC 598 and NGC 5457 has been studied in detail by forming line ratios of Balmer and Paschen emission lines covering a large wavelength range. Three homogeneous models of the geometrical distribution of the emitting sources and the obscuring dust have been tested. Only for low extinctions can the data be fit by a homogeneous slab. For most of the observed HII regions the Witt et al. (1992ApJ...393..611W) 'dusty nucleus' model matches the observations equally well as the usual assumption of a foreground screen, but the former implies much larger actual dust contents. Spatial variations in the optical depth in V of the order 0.3 across a region are found.

Abstract Copyright: ∼

Journal keyword(s): galaxies: individual: NGC 598, NGC 5457 - galaxies: ISM - dust, extinction - HII regions

Simbad objects: 10

goto View the references in ADS

Number of rows : 10
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 595 HII 01 33 33.53 +30 41 29.8           ~ 213 0
2 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
3 VGHC 2-95 PoG 01 34 15.6 +30 37 11 14.69 14.61 14.70 14.85 14.97 ~ 23 0
4 NGC 604 HII 01 34 32.1 +30 47 01           ~ 608 0
5 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2
6 HGGK 961 HII 14 03 27.2 +54 18 42           ~ 2 0
7 HGGK 949 HII 14 03 27.700 +54 18 49.17           ~ 6 0
8 HGGK 1026 HII 14 03 31.7 +54 17 14           ~ 4 0
9 NGC 5461 HII 14 03 40.96 +54 19 02.4           ~ 195 0
10 HGGK 1117 HII 14 03 42.2 +54 19 23           ~ 3 0

To bookmark this query, right click on this link: simbad:objects in 1997A&A...323..697P and select 'bookmark this link' or equivalent in the popup menu