Exploratory Chandra observations of low-metallicity AGN candidates

Details Exploratory Chandra observations of low-metallicity AGN candidates Exploratory Chandra observations of low-metallicity AGN candidates

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008cxo..prop.2623t&link_type=abstract

Chandra proposal ID #10700149

Physics

Scientific paper

Metallicity estimates of AGN generally range from solar to supersolar. This is because their massive, bulge-dominated galaxy hosts have processed much of their gas into stars by the present epoch. If AGN metallicity correlates with stellar mass, however, then low-metallicity AGN should reside in low-mass dwarf galaxies. Yet searches in low-mass galaxies have only turned up AGN with slightly subsolar metallicities, at best. So where are the low-metallicity AGN? We propose Chandra observations of four candidates discovered in a large sample of metal-poor dwarf galaxies in the SDSS (<0.1 solar). All are faint (M_g>-19.2), yet show strong broad Halpha (>3e41 erg/s, >2200 km/s) coming from very dense regions (>>1e4/cm3). Chandra will help to secure the AGN nature of these primordial analogues.

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