×
Well done. You've clicked the tower. This would actually achieve something if you had logged in first. Use the key for that. The name takes you home. This is where all the applicables sit. And you can't apply any changes to my site unless you are logged in.

Our policy is best summarized as "we don't care about _you_, we care about _them_", no emails, so no forgetting your password. You have no rights. It's like you don't even exist. If you publish material, I reserve the right to remove it, or use it myself.

Don't impersonate. Don't name someone involuntarily. You can lose everything if you cross the line, and no, I won't cancel your automatic payments first, so you'll have to do it the hard way. See how serious this sounds? That's how serious you're meant to take these.

×
Register


Required. 150 characters or fewer. Letters, digits and @/./+/-/_ only.
  • Your password can’t be too similar to your other personal information.
  • Your password must contain at least 8 characters.
  • Your password can’t be a commonly used password.
  • Your password can’t be entirely numeric.

Enter the same password as before, for verification.
Login

Grow A Dic
Define A Word
Make Space
Set Task
Mark Post
Apply Votestyle
Create Votes
(From: saved spaces)
Exclude Votes
Apply Dic
Exclude Dic

Click here to flash read.

Mid-infrared observations are powerful in identifying heavily obscured Active
Galactic Nuclei (AGN) which have weak emission in other wavelengths. Data from
the Mid-Infrared Instrument (MIRI) onboard JWST provides an excellent
opportunity to perform such studies. We take advantage of the MIRI imaging data
from the Cosmic Evolution Early Release Science Survey (CEERS) to investigate
the AGN population in the distant universe. We estimate the source properties
of MIRI-selected objects by utilizing spectral energy distribution (SED)
modelling, and classify them into star-forming galaxies (SF), SF-AGN mixed
objects, and AGN. The source numbers of these types are 418, 111, and 31,
respectively, from 4 MIRI pointings covering $\sim 9$ arcmin$^2$. The sample
spans a redshift range of $\approx 0$--5. We derive the median SEDs for all
three source types, respectively, and publicly release them. The median MIRI
SED of AGN is similar to the typical SEDs of hot dust-obscured galaxies and
Seyfert 2s, for which the mid-IR SEDs are dominantly from AGN-heated hot dust.
Based on our SED-fit results, we estimate the black-hole accretion density
(BHAD; i.e., total BH growth rate per comoving volume) as a function of
redshift. At $z<3$, the resulting BHAD agrees with the X-ray measurements in
general. At $z>3$, we identify a total of 27 AGN and SF-AGN mixed objects,
leading to that our high-$z$ BHAD is substantially higher than the X-ray
results ($\sim 0.5$ dex at $z \approx 3$--5). This difference indicates MIRI
can identify a large population of heavily obscured AGN missed by X-ray surveys
at high redshifts.

Click here to read this post out
ID: 129235; Unique Viewers: 0
Voters: 0
Latest Change: May 16, 2023, 7:30 a.m. Changes:
Dictionaries:
Words:
Spaces:
Comments:
Newcom
<0:100>