2014A&A...561A..64T


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.13CET03:37:26

2014A&A...561A..64T - Astronomy and Astrophysics, volume 561A, 64-64 (2014/1-1)

A Gemini/GMOS study of the physical conditions and kinematics of the blue compact dwarf galaxy Mrk 996.

TELLES E., THUAN T.X., IZOTOV Y.I. and CARRASCO E.R.

Abstract (from CDS):

We present an integral field spectroscopic study with the Gemini Multi-Object Spectrograph (GMOS) of the unusual blue compact dwarf (BCD) galaxy Mrk 996. We show through velocity and dispersion maps, emission-line intensity and ratio maps, and by a new technique of electron density limit imaging that the ionization properties of different regions in Mrk 996 are correlated with their kinematic properties. From the maps, we can spatially distinguish a very dense high-ionization zone with broad lines in the nuclear region, and a less dense low-ionization zone with narrow lines in the circumnuclear region. Four kinematically distinct systems of lines are identified in the integrated spectrum of Mrk 996, suggesting stellar wind outflows from a population of Wolf-Rayet (WR) stars in the nuclear region, superposed on an underlying rotation pattern. From the intensities of the blue and red bumps, we derive a population of ∼473 late nitrogen (WNL) stars and ∼98 early carbon (WCE) stars in the nucleus of Mrk 996, resulting in a high N(WR)/N(O+WR) of 0.19. We derive, for the outer narrow-line region, an oxygen abundance 12+log(O/H) = 7.94±0.30 (∼0.2 Z) by using the direct Te method derived from the detected narrow [O iii]λ4363 line. The nucleus of Mrk 996 is, however, nitrogen-enhanced by a factor of ∼20, in agreement with previous CLOUDY modeling. This nitrogen enhancement is probably due to nitrogen-enriched WR ejecta, but also to enhanced nitrogen line emission in a high-density environment. Although we have made use here of two new methods - principal component analysis (PCA) tomography and a method for mapping low- and high-density clouds - to analyze our data, new methodology is needed to further exploit the wealth of information provided by integral field spectroscopy.

Abstract Copyright:

Journal keyword(s): galaxies: individual: Mrk 996 - galaxies: kinematics and dynamics - galaxies: star formation - galaxies: ISM - abundances galaxies:

VizieR on-line data: <Available at CDS (J/A+A/561/A64): list.dat fits/*>

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 QSO B0125-0635 QSO 01 27 35.5241670251 -06 19 35.428005150 14.75 15.05 14.48 14.06 13.70 ~ 87 0
2 CD-28 595 PM* 01 54 50.2704861570 -27 28 35.740415025   12.06 11.51     ~ 116 0
3 UVQS J022054.52+003324.3 AGN 02 20 54.530 +00 33 24.46   16.50       ~ 55 1
4 HCG 31 CGG 05 01 37 -04 15.4           ~ 121 0
5 UGCA 116 H2G 05 55 42.645 +03 23 32.23 10.74 11.68 11.46   11.82 ~ 492 0
6 2MASX J08235499+2806223 EmG 08 23 54.9669334368 +28 06 21.605409814   15.5       ~ 52 0
7 LEDA 24384 Sy1 08 40 29.9132803308 +47 07 10.244168570   18.2       ~ 59 0
8 ESO 566-8 IG 09 44 59.65 -19 42 45.6   15.56   14.59   ~ 29 0
9 NGC 5253 AGN 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33   ~ 1247 4
10 Feige 110 HS* 23 19 58.3995050606 -05 09 56.170282845 10.360 11.45 11.50 11.970 12.145 sdO8VIIIHe5 539 1
11 LEDA 71605 EmG 23 30 09.7 +25 31 56   15.0       ~ 52 0

    Equat.    Gal    SGal    Ecl

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2019.12.13-03:37:26

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