SIMBAD references

2017ApJ...849...55S - Astrophys. J., 849, 55-55 (2017/November-8)

Virgo Redux: the masses and stellar content of nuclei in early-type galaxies from multiband photometry and spectroscopy.

SPENGLER C., COTE P., ROEDIGER J., FERRARESE L., SANCHEZ-JANSSEN R., TOLOBA E., LIU Y., GUHATHAKURTA P., CUILLANDRE J.-C., GWYN S., ZIRM A., MUNOZ R., PUZIA T., LANCON A., PENG E.W., MEI S. and POWALKA M.

Abstract (from CDS):

We present an analysis of 39 nuclei and their early-type hosts in the Virgo Cluster using 10 broadband filters: F300W, F475W, F850LP, F160W, u* griz, and Ks. We describe the Virgo Redux program, which provides high-resolution UV and NIR imaging. Combining this data with optical and NIR imaging from the ACS Virgo Cluster Survey and the Next Generation Virgo Cluster Survey, we estimate masses, metallicities, and ages using simple stellar population (SSP) models. For 19 nuclei, we compare to SSP parameters derived from Keck and Gemini spectra and find reasonable agreement between the photometric and spectroscopic metallicity: the rms scatter is 0.3 dex. We reproduce the nucleus-galaxy mass fraction of 0.33–0.07+0.09% for galaxy stellar masses 108.4–1010.3 M with a typical precision of ∼35% for the nuclei masses. Based on available model predictions, there is no single preferred formation scenario for nuclei, suggesting that nuclei are formed stochastically through a mix of processes. Nuclei metallicities are statistically identical to those of their hosts, appearing 0.07 ± 0.3 dex more metal-rich on average; however, omitting galaxies with unusual origins, nuclei are 0.20 ± 0.28 dex more metal-rich. Nuclei appear to be 0.56 ± 0.12 dex more metal-rich than ultracompact dwarf galaxies (UCDs) at fixed mass. We find no clear age difference between nuclei and their galaxies, with nuclei displaying a broad range of ages. Interestingly, we find that the most massive nuclei may be flatter and more closely aligned with the semimajor axes of their hosts, suggesting that they formed through predominantly dissipative processes.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: clusters: individual: Virgo - galaxies: elliptical and lenticular, cD - galaxies: nuclei - galaxies: photometry - galaxies: photometry

Errata: erratum vol. 869, art. 85 (2018)

Simbad objects: 44

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2017ApJ...849...55S and select 'bookmark this link' or equivalent in the popup menu


2021.02.26-17:46:48

© Université de Strasbourg/CNRS

    • Contact