2019A&A...626A..35R


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST08:09:06

2019A&A...626A..35R - Astronomy and Astrophysics, volume 626A, 35-35 (2019/6-1)

The young stellar population in NGC 247. Main properties and hierarchical clustering.

RODRIGUEZ M.J., BAUME G. and FEINSTEIN C.

Abstract (from CDS):


Aims. We seek to investigate the characteristics of the young stellar population in the spiral galaxy NGC 247. In particular, we focused our attention in its hierarchical clustering distributions and the properties of the smallest groups.
Methods. We used multiband Hubble Space Telescope (HST) data from three fields covering more than half of NGC 247 to select the young population. Then, through the path linkage criterion (PLC), we found compact young star groups and estimated their fundamental parameters, such as their stellar densities, sizes, number of members, and luminosity function (LF) slopes. We also performed a fractal analysis to determinate the clustering properties of this population. We built a stellar density map and dendrograms corresponding to the galactic young population to detect large structures and depict their main characteristics.
Results. We detect 339 young star groups, for which we compute a mean radius of ∼60pc and a maximum size distribution between 30 and 70pc. We also obtain LF slopes with a bimodal distribution showing peaks at ∼0.1 and ∼0.2. We identify several candidates for HII regions that follow an excellent spatial correlation with the young groups found by the PLC. We observe that the young populations are hierarchically organized, wherein the smaller and denser structures are within larger and less dense structures. We notice that all these groups present a fractal subclustering, following the hierarchical distribution observed in the corresponding stellar density map. For the large young structures observed in this map, we obtain a fractal dimension of ∼1.6-1.8 using the perimeter-area relation and cumulative size distribution. These values are consistent with a scenario of hierarchical star formation.

Abstract Copyright: © ESO 2019

Journal keyword(s): stars: early-type - stars: luminosity function - mass function - galaxies: individual: NGC 247 - galaxies: star formation - galaxies: star clusters: general

VizieR on-line data: <Available at CDS (J/A+A/626/A35): table3.dat table4.dat list.dat fits/*>

Nomenclature: Table 3: [RBF2019] NGC 247 ASNNN N=339 among (Nos AS001-AS342). Table 4: [RBF2019] NGC 247 NN (Nos 1-23).

Status at CDS:   Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 17

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Number of rows : 17

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 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10905 1
2 NGC 247 LSB 00 47 08.554 -20 45 37.44 10.11 9.61 9.10 8.87   ~ 373 2
3 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2931 2
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9446 1
5 NGC 300 GiG 00 54 53.4460065856 -37 41 03.182962667 8.83 8.69 8.13 7.46   ~ 1306 2
6 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 462 0
7 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5135 1
8 NGC 925 H2G 02 27 16.913 +33 34 43.97   10.69 10.12 9.55   ~ 694 1
9 NGC 1058 Sy2 02 43 30.0247243235 +37 20 28.807743477   12.29 11.75 10.85   ~ 435 0
10 NGC 2541 GiG 08 14 40.1104536348 +49 03 42.058472450 12.03 12.26 11.80     ~ 278 1
11 NGC 2717 G 08 57 01.135 -24 40 25.52   13.21   11.43   ~ 24 0
12 M 95 GiP 10 43 57.733 +11 42 13.00 10.71 10.51 9.73 9.48   ~ 936 2
13 NGC 3621 AGN 11 18 16.300 -32 48 45.36 10.10 9.44 9.56 8.07 10.1 ~ 488 3
14 M 91 LIN 12 35 26.430 +14 29 46.75   14.63 13.57     ~ 524 0
15 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2546 2
16 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1430 0
17 UGC 12732 GiP 23 40 39.96 +26 14 09.8   14.5       ~ 117 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-08:09:06

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