Marie Lau

Talk : Marie Lau, 3:00pm - 3:30pm
Probing Quasar/galaxy evolution, feeding, and feedback: Extremely Red Quasars (ERQs) and the Quasar-Associated Inflows Legacy Survey (QUAILS)
My research focuses on understanding the evolution, feeding, and feedback processes in quasar-host galaxies, particularly through extremely red quasars (ERQs) and quasar-associated absorption lines. First, I study ERQs at cosmic-noon redshifts. Using adaptive-optics integral-field spectroscopy, I resolved their [OIII]5007 emission (Lau et al. 2022), while wide-field integral-field observations revealed their extended Lyman-alpha halos (Lau et al. 2024). Recently, we have identified candidates for even fainter and redder quasars in photometric surveys and followed up with spectroscopy to confirm. If you study dust-reddened quasar populations, I welcome comparisons of selection techniques and characteristic properties. Second, I have initiated a study of quasar-associated absorption lines at intermediate to cosmic-noon redshifts. By measuring systemic redshifts of the host galaxies using [OII]3727 and [OIII]5007 emission lines, I obtain accurate relative velocities for the rest-frame UV associated absorbers. Of particular interest are redshifted absorbers, which trace inflowing gas onto quasar hosts. If you are interested in inflows, I would be happy to discuss potential collaborations.