1998A&AS..128..545R


Query : 1998A&AS..128..545R

1998A&AS..128..545R - Astron. Astrophys., Suppl. Ser., 128, 545-560 (1998/March-2)

Physical properties of the ionized gas and brightness distribution in NGC 4736.

RODRIGUES I., DOTTORI H., CEPA J. and VILCHEZ J.

Abstract (from CDS):

In this work we study the galaxy NGC 4736, using narrow band interference filters imaging centered at the emission lines [OII]λλ3727+3729, Hβ, [OIII]λ5007, Hα, [SII]λ6716+6730 and [SIII]λ9070 and nearby continua. We have obtained sizes, positions, emission line absolute fluxes, and continua intensities for 90 HII regions, mainly distributed in a ring-like structure of 3.2kpc in diameter. The Hα luminosities are in the range 37.3≤log(L)≤39.4erg/s. The HII regions size distribution presents a characteristic diameter D0=115pc and verifies the relation log(L)∝D3. The temperature of the ionizing sources and the metallicity of the HII regions are respectively in the ranges 3.4x104≲T*≲4.0x104K and 8.5≲12+log(O/H)≲9.3. The masses of the ionizing clusters are in the range 5x103≲MT/M≲2x105. The continua radial surface brightness distribution is better fitted by the superposition of a de Vaucouleurs', a thin and a thick exponential disk laws. The monochromatic colors show that outside the star forming ring the disk presents a younger stellar population than inside it.

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 4736 - galaxies: abundances - galaxies: ISM - galaxies: spiral - galaxies: structure

VizieR on-line data: <Available at CDS (J/A+AS/128/545): table3.dat table4.dat>

Nomenclature: Table 3: [RDC98] NN (Nos 1-90)

CDS comments: Table 3, Col(2): cross-id. HK NGC 4736 NNN.

Simbad objects: 6

goto Full paper

goto View the references in ADS

Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 HD 84937 Pe* 09 48 56.0992891997 +13 44 39.326709913 8.49 8.68 8.32 7.97 7.70 F8Vm-5 799 0
2 HK NGC 4736 52 HII 12 50 49.6 +41 07 23           ~ 5 0
3 HK NGC 4736 53 HII 12 50 49.6 +41 07 34           ~ 4 0
4 M 94 SyG 12 50 53.0737971432 +41 07 12.900884628 9.15 8.96 8.24 7.78   ~ 1393 2
5 HK NGC 4736 9 HII 12 50 56.3 +41 07 20           ~ 4 0
6 HK NGC 4736 8 HII 12 50 56.3 +41 07 20           ~ 5 0

To bookmark this query, right click on this link: simbad:objects in 1998A&AS..128..545R and select 'bookmark this link' or equivalent in the popup menu