Astronomy and Astrophysics – Astronomy
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...625..121m&link_type=abstract
The Astrophysical Journal, Volume 625, Issue 1, pp. 121-129.
Astronomy and Astrophysics
Astronomy
48
Galaxies: Clusters: Individual: Name: Virgo, Galaxies: Distances And Redshifts, Galaxies: Dwarf, Galaxies: Elliptical And Lenticular, Cd
Scientific paper
As part of the Advanced Camera for Surveys (ACS) Virgo Cluster Survey, we have measured surface brightness fluctuations (SBFs) in a sample of 100 early-type Virgo galaxies. Distances derived from these measurements are needed to explore the three-dimensional structure of the Virgo Cluster, study the intrinsic parameters of globular clusters associated with the program galaxies, and compare with the galaxy distances derived from globular cluster luminosity functions. Our SBF measurements have been performed in the F850LP bandpass of the Wide Field Channel of the ACS on the Hubble Space Telescope. These are the first measurements of this kind, and we present the first SBF calibration for this bandpass. The measured fluctuations depend on galaxy stellar population variations, which we quantify by galaxy color (g475-z850)0, where g475 and z850 are the galaxy magnitudes in the F475W and F850LP ACS filters, respectively. We derive the calibration for the absolute SBF magnitude M850=-2.06+/-0.04+(2.0+/-0.2)[(g475-z850)0-1.3] in the range 1.3<(g475-z850)0<=1.6, and M850=-2.06+/-0.04+(0.9+/-0.2)[(g475-z850)0-1.3] in the range 1.0<=(g475-z850)0<=1.3. The quoted zero-point uncertainty here includes all sources of internal error; there is an additional systematic uncertainty of ~0.15 mag, due to the uncertainty in the distance scale calibration. Physically, the two different color regimes correspond to different galaxy types: giant ellipticals and S0s at the red end, and early-type dwarfs at the blue end. For the first time in SBF studies, we are able to provide a firm empirical calibration of SBF in early-type dwarf galaxies. Our results agree with stellar population model predictions from Bruzual & Charlot in the range 1.3<(g475-z850)0<=1.6, while our empirical slope is somewhat steeper than the theoretical prediction in the range 0.9<=(g475-z850)0<=1.3.
Blakeslee John P.
Cote' Patrick
Ferrarese Laura
Jord'an Andrés
Mei Simona
No associations
LandOfFree
The Advanced Camera for Surveys Virgo Cluster Survey. V. Surface Brightness Fluctuation Calibration for Giant and Dwarf Early-Type Galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Advanced Camera for Surveys Virgo Cluster Survey. V. Surface Brightness Fluctuation Calibration for Giant and Dwarf Early-Type Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Advanced Camera for Surveys Virgo Cluster Survey. V. Surface Brightness Fluctuation Calibration for Giant and Dwarf Early-Type Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1701296