Spheroid Luminosity and Mass Functions fromHubble Space TelescopeStar Counts | Zendy

Andrew Gould | Zendy; Chris Flynn | Zendy; John N. Bahcall | Zendy

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Spheroid Luminosity and Mass Functions fromHubble Space TelescopeStar Counts

Author(s) -

Andrew Gould,

Chris Flynn,

John N. Bahcall

Publication year - 1998

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/306023

Subject(s) - physics , spheroid , astrophysics , globular cluster , hubble space telescope , gravitational microlensing , power law , metallicity , hubble deep field , luminosity function , stars , astronomy , stellar mass , star formation , luminosity , galaxy , biochemistry , chemistry , statistics , mathematics , in vitro

We analyze 166 spheroid subdwarfs $(6.5 M >0.09 Msun. The spheroid therefore does not contributesignificantly to microlensing unless the mass function changes slopedramatically in the substellar range. The total local mass density of spheroidstars (including remnants and unseen binary companions) is \rho ~ 6.4E-5Msun/pc^3, with an uncertainty of about 50%. The power-law indices \alpha=0.25for the spheroid and \alpha=0.44 for the disk (both uncorrected for binaries)are similar to those of globular clusters of moderate to high metallicity.Comment: Clarifications and improvements made in response to referee repor

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