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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20100527T000000
DTEND;TZID=Atlantic/Canary:20100527T010000
UID:iactalks-9
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/9
CREATED:2010-05-27T00:00:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Which galaxies host bars and disks? A study of the Coma Cluster ; (
 2)First results of Herschel and the HerMES extragalactic survey
DESCRIPTION:Which galaxies host bars and disks? A study of the Coma Cluster
  ; (2)First results of Herschel and the HerMES extragalactic survey\nDr. J
 airo Méndez Abreu, Dr. Ismael Pérez Fournon\n\n(1) In this talk I will p
 resent a recent study of the bar fraction in the Coma Cluster galaxies bas
 ed on a sample of 190 galaxies selected from the Sloan Digital Sky Survey 
 Data Release 6 and observed with the Hubble Space Telescope (HST) Advanced
  Camera for Survey (ACS). The unprecedented resolution of the HST-ACS imag
 es allows us to explore the presence of bars, detected by visual classific
 ation, throughout a luminosity range of 9 mag (-23 < Mr < -14), perm
 itting us to study the poor known region of dwarf galaxies. We find that b
 ars are hosted by galaxies in a tight range of both luminosities (-22 <
  Mr < -17) and masses (109 < M/M? < 1011). This result holds when
  compared with a sample of bright/massive field galaxies. In addition, we 
 find that the bar fraction does not vary significantly when going from the
  center to the cluster outskirts, implying that cluster environment plays 
 a second-order role in bar formation/evolution. The shape of the bar fract
 ion distribution with respect to both luminosity and mass is well matched 
 by the luminosity distribution of disk galaxies in Coma, indicating that b
 ars are good tracers of cold stellar disks. We discuss the implications of
  our results for the formation and evolution scenarios of bars and disks.\
 n(2) The Herschel Space Observatory was launched on 14 May 2009. After a s
 hort commissioning and performance verification period, the science demons
 tration observations started in September 2009. Herschel is carrying out n
 ow routine science observations. The three instruments (SPIRE, PACS and HI
 FI) are working extremely well. The first results of the many Herschel Key
  Projects were presented at the ESLAB 2010 conference in ESTEC on May 4-7 
 2010 and will be published in a special issue of Astronomy and Astrophysic
 s. In this talk I will introduce the observing capabilities of Herschel an
 d will review some of the first results in extragalactic astronomy and in 
 particular those of the Herschel Multi-tiered Extragalactic Survey (HerMES
 ).
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