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The halo of M49 and its environment as traced by planetary nebulae

Published online by Cambridge University Press:  08 August 2017

Johanna Hartke ,
Magda Arnaboldi ,
Alessia Longobardi ,
Ortwin Gerhard ,
Ken Freeman  and
Sadanori Okamura
Johanna Hartke
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany, email: jhartke@eso.org; marnabol@eso.org
Magda Arnaboldi
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany, email: jhartke@eso.org; marnabol@eso.org
Alessia Longobardi
Affiliation:
Kavli Institute for Astronomy and Astrophysics, Peking University, 5 Yiheyuan Road, Beijing 100871, P. R. China, email: alongobardi@pku.edu.cn Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, 85748 Garching, Germany, email: gerhard@mpe.mpg.de
Ortwin Gerhard
Affiliation:
Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, 85748 Garching, Germany, email: gerhard@mpe.mpg.de
Ken Freeman
Affiliation:
RSAA, Mt. Stromlo Observatory, 2611, Canberra, Australia, email: Kenneth.Freeman@anu.edu.au
Sadanori Okamura
Affiliation:
Department of Advanced Sciences, Faculty of Science and Engineering, Hosei University, 184-8584 Tokyo, Japan, email: sadanori.okamura@hosei.ac.jp
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Abstract

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We investigate the stellar halo of the nearby elliptical Virgo-cluster galaxy M49 using Planetary Nebulae (PNe). M49 is the second-brightest galaxy of the Virgo cluster and is at the center of the Virgo subcluster B. We present an extended catalogue extracted from a narrow-band survey carried out with Subaru’s Suprime Cam, consisting of 735 PNe down to a limiting magnitude of m5007 = 29.3. This PNe population traces the halo out to 155 kpc from the galaxy’s center, which provides accurate measurement of the luminosity-specific PN-number (α-parameter) in the inner and outer regions of M49’s halo. We are also able to determine the morphological variation of the planetary nebulae luminosity function (PNLF), that may trace different parent stellar populations. This enables us to identify the transition from the PN-scarce, possibly metal-rich, galaxy halo to the PN-rich, metal-poor, outer component.

Keywords

galaxies: clusters: individual (Virgo)galaxies: elliptical and lenticularcDgalaxies: individual (M49)planetary nebulae: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S323: Planetary Nebulae: Multi-Wavelength Probes of Stellar and Galactic Evolution , October 2016 , pp. 293 - 297
Copyright
Copyright © International Astronomical Union 2017 

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