2014MNRAS.441.2296M


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.31CET12:37:25

2014MNRAS.441.2296M - Mon. Not. R. Astron. Soc., 441, 2296-2308 (2014/July-1)

Aperture effects on spectroscopic galaxy activity classification.

MARAGKOUDAKIS A., ZEZAS A., ASHBY M.L.N. and WILLNER S.P.

Abstract (from CDS):

Activity classification of galaxies based on long-slit and fibre spectroscopy can be strongly influenced by aperture effects. Here, we investigate how activity classification for 14 nearby galaxies depends on the proportion of the host galaxy's light that is included in the aperture. We use both observed long-slit spectra and simulated elliptical-aperture spectra of different sizes. The degree of change varies with galaxy morphology and nuclear activity type. Starlight removal techniques can mitigate but not remove the effect of host galaxy contamination in the nuclear aperture. Galaxies with extranuclear star formation can show higher [Oiii] λ5007/Hβ ratios with increasing aperture, in contrast to the naive expectation that integrated light will only dilute the nuclear emission lines. We calculate the mean dispersion for the diagnostic line ratios used in the standard diagrams with respect to the central aperture of spectral extraction to obtain an estimate of the uncertainties resulting from aperture effects.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): galaxies: active - galaxies: nuclei - galaxies: Seyfert - galaxies: starburst

Simbad objects: 15

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Number of rows : 15

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 2C 94 Sy2 01 08 52.8701245540 +13 20 14.257796477   15.19       ~ 441 2
2 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3582 3
3 NGC 2608 IG 08 35 17.3303377145 +28 28 24.248551909   13.2       ~ 157 0
4 NGC 2731 G 09 02 08.394 +08 18 06.36   14.2       ~ 46 0
5 NGC 3306 GiG 10 37 10.2227333951 +12 39 09.356746905   13.7       ~ 70 0
6 UGC 6732 G 11 45 33.1241830864 +58 58 41.309406715   13.33 13.17     ~ 49 0
7 NGC 4412 Sy2 12 26 36.0838908611 +03 57 52.923602148   13.2       ~ 127 0
8 NGC 4491 GiG 12 30 57.1115841111 +11 29 00.712485343   13.50 12.55     ~ 139 1
9 NGC 4500 bCG 12 31 22.1543090614 +57 57 52.622597281   13.2       ~ 109 0
10 NGC 4704 Sy2 12 48 46.4269067838 +41 55 16.522697693   14.8       ~ 62 0
11 NGC 4868 GiG 12 59 08.8822136898 +37 18 37.471197587   12.9       ~ 61 1
12 NGC 5506 AGN 14 13 14.901 -03 12 27.22   15.25 14.38     ~ 998 0
13 NGC 5532 LIN 14 16 52.928 +10 48 26.43   13.3       ~ 323 3
14 NGC 5660 GiG 14 29 49.8202528209 +49 37 21.596766520   12.2       ~ 103 0
15 Mrk 817 Sy1 14 36 22.0820075123 +58 47 39.395406826   14.19 13.79     ~ 427 0

    Equat.    Gal    SGal    Ecl

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2020.10.31-12:37:25

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