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Star Formation Rates in [Ne V] 3426 Å Selected Active Galactic Nuclei: Evidence for a Decrease along the Main Sequence?
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DOI：10.3847/1538-4357/ad47bb.png)
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摘要
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Studying the behavior along the galaxy main sequence is key in furthering our understanding of the possible connection between active galactic nucleus (AGN) activity and star formation. We select a sample of 1215 AGN from the catalog of Sloan Digital Sky Survey galaxy properties from the Portsmouth group by detection of the high-ionization [Ne v] 3426 & Aring; emission line. Our sample extends from 1040 to 1042.5 erg s-1 in [Ne v] luminosity in a redshift range z = 0.17 to 0.57. We compare the specific star formation rates (sSFRs; SFR scaled by galaxy mass) obtained from the corrected [O ii] and H alpha luminosities, and the spectral energy distribution (SED)-determined values from Portsmouth. We find that the emission-line-based sSFR values are unreliable for the [Ne v] sample due to the AGN contribution, and proceed with the SED sSFRs for our study of the main sequence. We find evidence for a decrease in sSFR along the main sequence in the [Ne v] sample, which is consistent with results from the hard X-ray Burst Alert Telescope AGN sample, which extends to lower redshifts than our [Ne v] sample. Although we do not find evidence that the concurrent AGN activity is suppressing star formation, our results are consistent with a lower gas fraction in the host galaxies of the AGN as compared to that of the star-forming galaxies. If the evacuation of gas, and therefore suppression of star formation, is due to AGN activity, it must have occurred in a previous epoch.
Keyword:
SUPERMASSIVE BLACK-HOLES
DIGITAL SKY SURVEY
X-RAY
REDSHIFT GALAXIES
OBSCURED AGN
EMISSION
SDSS
LUMINOSITY
SPECTRA
CLASSIFICATION
期刊
IF:
5.4
论文数:
8.3W
被引数:
32.0W
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Self-Quantification Systems to Support Physical Activity: From Theory to Implementation PrinciplesOAAI
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