2010A&A...518A..32M


Query : 2010A&A...518A..32M

2010A&A...518A..32M - Astronomy and Astrophysics, volume 518, A32-32 (2010/7-2)

Multiband photometric decomposition of nuclear stellar disks.

MORELLI L., CESETTI M., CORSINI E.M., PIZZELLA A., DALLA BONTA E., SARZI M. and BERTOLA F.

Abstract (from CDS):

Small, bright stellar disks with scale lengths of a few tens of parsec are known to reside in the center of galaxies. They are believed to have formed in a dissipational process as the end result of star formation in gas either accreted during a merging (or acquisition) event or piled up by the secular evolution of a nuclear bar. Only a few of them have been studied in detail to date. Using archival Hubble Space Telescope (HST) imaging, we investigate the photometric parameters of the nuclear stellar disks hosted by three early-type galaxies in the Virgo cluster, NGC 4458, NGC 4478, and NGC 4570, to constrain the process that forms their stars. The central surface brightness, scale length, inclination, and position angle of the nuclear disks were derived by adopting the photometric decomposition method introduced by Scorza & Bender (1995A&A...293...20S) and assuming the disks to be infinitesimally thin and exponential. The location, orientation, and size of the nuclear disks is the same in all the images obtained with the Wide Field Planetary Camera 2 and Advanced Camera for Surveys and available in the HST Science Archive. The scale length, inclination, and position angle of each disk are constant within the errors in the observed U, B, V, and I passbands, independently of their values and the properties of the host spheroid. We interpret the absence of color gradients in the stellar population of the nuclear disks as the signature that star formation homogeneously occurred along their length. An inside-out formation scenario is, instead, expected to produce color gradients and is therefore ruled out.

Abstract Copyright:

Journal keyword(s): Galaxy: bulge - galaxies: elliptical and lenticular, cD - galaxies: photometry - galaxies: structure

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NGC 4128 GiG 12 08 32.2956594552 +68 46 03.393508728   12.7       ~ 69 0
2 NGC 4342 GiP 12 23 39.0032044488 +07 03 14.359499100   13.0       ~ 298 0
3 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6377 0
4 NGC 4458 GiP 12 28 57.5613938232 +13 14 30.946545276 13.27 12.93 12.07     ~ 403 2
5 NGC 4478 GiP 12 30 17.4160005576 +12 19 42.790577160 12.82 12.36 11.45   10.17 ~ 483 1
6 UGC 7658 GiG 12 30 57.7095721176 +12 16 13.316512872   11.2 11.59 12.02   ~ 222 1
7 NGC 4570 GiG 12 36 53.3828233728 +07 14 47.697174852   11.8       ~ 322 0
8 M 59 GiG 12 42 02.2581375168 +11 38 48.909507756   11.0       ~ 677 0
9 NGC 4698 Sy2 12 48 22.9082830584 +08 29 14.667552276   13.24 12.27     ~ 468 0
10 NGC 5308 GiP 13 47 00.4361008824 +60 58 23.334066588   12.5       ~ 196 0

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2023.01.27-18:29:35

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