Galaxies on Top of Quasars: Probing Dwarf Galaxies in the Sloan Digital Sky Survey Lorrie Straka D. York, P. Noterdaeme, R. Srianand, D. Bowen, P. Khare, M. Bishof, Z. Whichard, V. Kulkarni AAS: Probes of Dark Matter on Galaxy Scales Monterey, CA July 16, 2013
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Galaxies on Top of Quasars: Probing Dwarf Galaxies in the ... · Galaxies on Top of Quasars Low-z galaxies intervening with background quasars in the SDSS – Narrow galactic emission
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Galaxies on Top of Quasars: Probing Dwarf Galaxies in the Sloan Digital Sky
Survey
Lorrie Straka
D. York, P. Noterdaeme, R. Srianand, D. Bowen, P. Khare, M. Bishof, Z. Whichard, V. Kulkarni
AAS: Probes of Dark Matter on Galaxy ScalesMonterey, CAJuly 16, 2013
Outline
Quasar absorption line systems (QSOALS) – a review
Current issues in QSOALS Galaxies on Top of Quasars (GOTOQs) Results Dwarf and dark galaxy connections Future studies
Quasar Absorption Line Systems
Absorption systems have been studied for decades for their unique insight into galaxy properties
– QSOALS eliminate luminosity bias in galaxy selection Detection in emission has been challenging
– Imaging and emission spectroscopy necessary to understand the environments of these systems
Lyα and Mg II
– UV observations
– DLA (log N(HI) > 20.3) Optical features: Ca II and Na I
QSOALS
Pettini 2004
QSOALS – Current Questions
How are these absorption features related to their environments?
– Morphology, mass, SFR How are absorption properties related to emission
properties in the same system? Where are all the dwarf galaxies? How are dark galaxies related? A sample of low-z quasar-galaxy pairs detected in
emission can help make a connection with higher-z QSOALS
Galaxies on Top of Quasars
Low-z galaxies intervening with background quasars in the SDSS
– Narrow galactic emission lines in SDSS QSO spectra
Strong galactic emission lines present in QSO spectra indicate a part of a galaxy falling within 3” of the line of sight
– Spectral fiber 3” in diameter
GOTOQs
Automated searches for nine strong galactic emission lines