2011MNRAS.415.2439R


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST07:12:29

2011MNRAS.415.2439R - Mon. Not. R. Astron. Soc., 415, 2439-2474 (2011/August-2)

PPAK wide-field Integral Field Spectroscopy of NGC 628 – II. Emission line abundance analysis.

ROSALES-ORTEGA F.F., DIAZ A.I., KENNICUTT R.C. and SANCHEZ S.F.

Abstract (from CDS):

In this second paper of the series, we present the two-dimensional (2D) emission line abundance analysis of NGC 628, the largest object within the PPAK Integral Field Spectroscopy (IFS) Nearby Galaxies Survey, PINGS. We introduce the methodology applied to the 2D IFS data in order to extract and deal with large spectral samples, from which a 2D abundance analysis can be later performed. We obtain the most complete and reliable abundance gradient of the galaxy up to date, by using the largest number of spectroscopic points sampled in the galaxy, and by comparing the statistical significance of different strong-line metallicity indicators. We find features not previously reported for this galaxy that imply a multimodality of the abundance gradient consistent with a nearly flat distribution in the innermost regions of the galaxy, a steep negative gradient along the disc and a shallow gradient or nearly constant metallicity beyond the optical edge of the galaxy. The N/O ratio seems to follow the same radial behaviour. We demonstrate that the observed dispersion in metallicity shows no systematic dependence with the spatial position, signal-to-noise ratio or ionization conditions, implying that the scatter in abundance for a given radius is reflecting a true spatial physical variation of the oxygen content. Furthermore, by exploiting the 2D IFS data, we were able to construct the 2D metallicity structure of the galaxy, detecting regions of metal enhancement and showing that they vary depending on the choice of the metallicity estimator. The analysis of axisymmetric variations in the disc of NGC 628 suggest that the physical conditions and the star formation history of different symmetric regions of the galaxy have evolved in a different manner.

Based on observations made at the Centro Astronómico Hispano Alemán (CAHA) at Calar Alto, operated jointly by the Max-Planck Institut für Astronomie and the Instituto de Astrofìsica de Andalucìa (CSIC).


Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): methods: data analysis - techniques: spectroscopic - galaxies: abundances - galaxies: individual: NGC 628 (M74) - galaxies: ISM - galaxies: spiral

CDS comments: T.2 : Cross-ids for HH regions are respectively : [H76] 292, [H76] 154, [H76] 451, [H76] 572, [H76] 598, [VSH98] NGC 628 +081-140, [VSH98] NGC 628 +044-175, [H76] 627, [VSH98] NGC 628 +062-158

Simbad objects: 16

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Number of rows : 16

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 NGC 604 HII 01 34 32.1 +30 47 01           ~ 544 0
2 [BKG99] NGC 628 6 HII 01 36 29.384 +15 48 28.11           ~ 2 0
3 [BKG99] NGC 628 7 HII 01 36 35.5 +15 50 11           ~ 18 0
4 [VSH98] NGC 628 -076-029 HII 01 36 36.82 +15 46 34.5           ~ 8 0
5 [YZL2016] 20 HII 01 36 37.71 +15 45 11.3           ~ 6 0
6 [YZL2016] 18 HII 01 36 38.82 +15 44 24.0           ~ 10 0
7 M 74 G 01 36 41.772 +15 47 00.46 10.52 10.00 9.46 9.16   ~ 1400 1
8 [BKG99] NGC 628 4 HII 01 36 44.584 +15 45 06.11           ~ 4 0
9 [VSH98] NGC 628 +044-175 HII 01 36 44.6475 +15 44 08.000           ~ 3 0
10 [BKG99] NGC 628 1 HII 01 36 45.1 +15 47 51           ~ 6 0
11 [SRM2012] NGC628-133 HII 01 36 45.98 +15 44 27.3           ~ 5 0
12 [VSH98] NGC 628 +081-140 HII 01 36 47.2105 +15 44 43.000           ~ 3 0
13 M 42 HII 05 35 17.3 -05 23 28           ~ 3724 0
14 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1734 1
15 NGC 4625 GiP 12 41 52.701 +41 16 25.39 12.74 12.92 12.35     ~ 309 2
16 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2228 2

    Equat.    Gal    SGal    Ecl

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