Restricted Research - Award List, Note/Discussion Page
Fiscal Year: 2023
179 University of North Texas (142067)
Principal Investigator: Shemmer,Ohad
Total Amount of Contract, Award, or Gift (Annual before 2011): $ 64,270
Exceeds $250,000 (Is it flagged?): No
Start and End Dates: 1/4/23 - 1/3/25
Restricted Research: YES
Academic Discipline: Physics
Department, Center, School, or Institute: College of Science
Title of Contract, Award, or Gift: Chandra's Crucial Role in Identifying a Robust and Practical Accretion-Rate Indicator for Quasars
Name of Granting or Contracting Agency/Entity:
Smithsonian Astrophysical Observatory
CFDA Link: NASA
43.001
Program Title:
none
CFDA Linked: Aerospace Education Services Program
Note:
We propose Chandra snapshot observations of 54 luminous sources drawn from the Gemini Near Infrared Spectrograph - Distant Quasar Survey (GNIRS-DQS; [22]). GNIRS-DQS is the largest uniform sample (226 sources) of Sloan Digital Sky Survey (SDSS) quasars at 1:55 6, where quasarBELR lines are weaker than normal (e.g., [2]; Fig. 1b) thus hampering MBH and L=LEdd estimatesusing the SE method. C IV Blueshift: BELR lines exhibit velocity shifts, mostly blueshifts, with respect to the systemic redshift that increase with ionization potential (e.g., [15]; [16]; [36]). Strong correlationsbetween C iv blueshift and both EW(C iv) and ox (e.g., [19]; Fig. 2b) have been interpretedwithin the context of an accretion-disk wind that manifests itself as a larger C iv blueshift for aweakly ionizing (soft) SED, exhibiting a more negative ox value, while quenching the C iv emission (i.e., lowering the EW; e.g., [25]; [38]).
Discussion: No discussion notes