Identification of galaxies that experienced a recent major drop of star formation. Ciesla, L., Elbaz, D., Schreiber, C., Daddi, E., & Wang, T. ArXiv e-prints, 1803:arXiv:1803.10239, March, 2018. ![Identification of galaxies that experienced a recent major drop of star formation [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper abstract bibtex [abridged] Building upon a previous study, we define a method to blindly identify galaxies that underwent, and may still be undergoing, a fast downfall of their star-formation activity, that is, a more than 80% drop in star-formation rate (SFR) occurring in less than 500 Myr. Modeling galaxies' SED with a delayed-\${\textbackslash}tau\$ star formation history (SFH), with and without allowing an instantaneous SFR drop within the last hundreds Myr, we isolate 102 candidates out of a subsample of 6,680 galaxies classified as star-forming from the UVJ criterion in the ZFOURGE catalogues. These galaxies are mostly located in the lower part of the SFR-M\$_*\$ main sequence (MS) and extend up to a factor 100 below it. They also lie close to the limit between the passive and active regions on the UVJ diagram, indicating that they are in a transition phase. We show that the selected candidates have different physical properties compared to galaxies with similar UVJ colors, namely, lower star-formation rates and different stellar masses. The morphology of the candidates show no preference for a particular type. Among the 102 candidates, only 4 show signs of an AGN activity (from X-ray luminosity or UV-IR SED fitting decomposition). This low fraction of AGNs among the candidates implies that AGN activity may not be the main driver of the recent downfall, although timescale differences and duty cycle must be taken into account. We finally attempt to recover the past position of these galaxies on the SFR-M\$_*\$ plane, before the downfall of their star-formation and show that some of them were in the starburst region before and are back on the MS. These candidates constitute a promising sample that need more investigation in order to understand the different mechanisms at the origin of the star formation decrease of the Universe since \$z\$\${\textbackslash}sim\$2.
@article{ciesla_identification_2018,
title = {Identification of galaxies that experienced a recent major drop of star formation},
volume = {1803},
url = {http://adsabs.harvard.edu/abs/2018arXiv180310239C},
abstract = {[abridged] Building upon a previous study, we define a method to blindly
identify galaxies that underwent, and may still be undergoing, a fast
downfall of their star-formation activity, that is, a more than 80\% drop
in star-formation rate (SFR) occurring in less than 500 Myr. Modeling
galaxies' SED with a delayed-\${\textbackslash}tau\$ star formation history (SFH), with
and without allowing an instantaneous SFR drop within the last hundreds
Myr, we isolate 102 candidates out of a subsample of 6,680 galaxies
classified as star-forming from the UVJ criterion in the ZFOURGE
catalogues. These galaxies are mostly located in the lower part of the
SFR-M\$\_*\$ main sequence (MS) and extend up to a factor 100 below it.
They also lie close to the limit between the passive and active regions
on the UVJ diagram, indicating that they are in a transition phase. We
show that the selected candidates have different physical properties
compared to galaxies with similar UVJ colors, namely, lower
star-formation rates and different stellar masses. The morphology of the
candidates show no preference for a particular type. Among the 102
candidates, only 4 show signs of an AGN activity (from X-ray luminosity
or UV-IR SED fitting decomposition). This low fraction of AGNs among the
candidates implies that AGN activity may not be the main driver of the
recent downfall, although timescale differences and duty cycle must be
taken into account. We finally attempt to recover the past position of
these galaxies on the SFR-M\$\_*\$ plane, before the downfall of their
star-formation and show that some of them were in the starburst region
before and are back on the MS. These candidates constitute a promising
sample that need more investigation in order to understand the different
mechanisms at the origin of the star formation decrease of the Universe
since \$z\$\${\textbackslash}sim\$2.},
urldate = {2018-04-04},
journal = {ArXiv e-prints},
author = {Ciesla, L. and Elbaz, D. and Schreiber, C. and Daddi, E. and Wang, T.},
month = mar,
year = {2018},
keywords = {Astrophysics - Astrophysics of Galaxies},
pages = {arXiv:1803.10239},
}
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Modeling galaxies' SED with a delayed-\\${\\textbackslash}tau\\$ star formation history (SFH), with and without allowing an instantaneous SFR drop within the last hundreds Myr, we isolate 102 candidates out of a subsample of 6,680 galaxies classified as star-forming from the UVJ criterion in the ZFOURGE catalogues. These galaxies are mostly located in the lower part of the SFR-M\\$_*\\$ main sequence (MS) and extend up to a factor 100 below it. They also lie close to the limit between the passive and active regions on the UVJ diagram, indicating that they are in a transition phase. We show that the selected candidates have different physical properties compared to galaxies with similar UVJ colors, namely, lower star-formation rates and different stellar masses. The morphology of the candidates show no preference for a particular type. Among the 102 candidates, only 4 show signs of an AGN activity (from X-ray luminosity or UV-IR SED fitting decomposition). This low fraction of AGNs among the candidates implies that AGN activity may not be the main driver of the recent downfall, although timescale differences and duty cycle must be taken into account. We finally attempt to recover the past position of these galaxies on the SFR-M\\$_*\\$ plane, before the downfall of their star-formation and show that some of them were in the starburst region before and are back on the MS. These candidates constitute a promising sample that need more investigation in order to understand the different mechanisms at the origin of the star formation decrease of the Universe since \\$z\\$\\${\\textbackslash}sim\\$2.","urldate":"2018-04-04","journal":"ArXiv e-prints","author":[{"propositions":[],"lastnames":["Ciesla"],"firstnames":["L."],"suffixes":[]},{"propositions":[],"lastnames":["Elbaz"],"firstnames":["D."],"suffixes":[]},{"propositions":[],"lastnames":["Schreiber"],"firstnames":["C."],"suffixes":[]},{"propositions":[],"lastnames":["Daddi"],"firstnames":["E."],"suffixes":[]},{"propositions":[],"lastnames":["Wang"],"firstnames":["T."],"suffixes":[]}],"month":"March","year":"2018","keywords":"Astrophysics - Astrophysics of Galaxies","pages":"arXiv:1803.10239","bibtex":"@article{ciesla_identification_2018,\n\ttitle = {Identification of galaxies that experienced a recent major drop of star formation},\n\tvolume = {1803},\n\turl = {http://adsabs.harvard.edu/abs/2018arXiv180310239C},\n\tabstract = {[abridged] Building upon a previous study, we define a method to blindly \nidentify galaxies that underwent, and may still be undergoing, a fast\ndownfall of their star-formation activity, that is, a more than 80\\% drop\nin star-formation rate (SFR) occurring in less than 500 Myr. Modeling\ngalaxies' SED with a delayed-\\${\\textbackslash}tau\\$ star formation history (SFH), with\nand without allowing an instantaneous SFR drop within the last hundreds\nMyr, we isolate 102 candidates out of a subsample of 6,680 galaxies\nclassified as star-forming from the UVJ criterion in the ZFOURGE\ncatalogues. These galaxies are mostly located in the lower part of the\nSFR-M\\$\\_*\\$ main sequence (MS) and extend up to a factor 100 below it.\nThey also lie close to the limit between the passive and active regions\non the UVJ diagram, indicating that they are in a transition phase. We\nshow that the selected candidates have different physical properties\ncompared to galaxies with similar UVJ colors, namely, lower\nstar-formation rates and different stellar masses. The morphology of the\ncandidates show no preference for a particular type. Among the 102\ncandidates, only 4 show signs of an AGN activity (from X-ray luminosity\nor UV-IR SED fitting decomposition). This low fraction of AGNs among the\ncandidates implies that AGN activity may not be the main driver of the\nrecent downfall, although timescale differences and duty cycle must be\ntaken into account. We finally attempt to recover the past position of\nthese galaxies on the SFR-M\\$\\_*\\$ plane, before the downfall of their\nstar-formation and show that some of them were in the starburst region\nbefore and are back on the MS. These candidates constitute a promising\nsample that need more investigation in order to understand the different\nmechanisms at the origin of the star formation decrease of the Universe\nsince \\$z\\$\\${\\textbackslash}sim\\$2.},\n\turldate = {2018-04-04},\n\tjournal = {ArXiv e-prints},\n\tauthor = {Ciesla, L. and Elbaz, D. and Schreiber, C. and Daddi, E. and Wang, T.},\n\tmonth = mar,\n\tyear = {2018},\n\tkeywords = {Astrophysics - Astrophysics of Galaxies},\n\tpages = {arXiv:1803.10239},\n}\n\n","author_short":["Ciesla, L.","Elbaz, D.","Schreiber, C.","Daddi, E.","Wang, T."],"key":"ciesla_identification_2018","id":"ciesla_identification_2018","bibbaseid":"ciesla-elbaz-schreiber-daddi-wang-identificationofgalaxiesthatexperiencedarecentmajordropofstarformation-2018","role":"author","urls":{"Paper":"http://adsabs.harvard.edu/abs/2018arXiv180310239C"},"keyword":["Astrophysics - Astrophysics of Galaxies"],"metadata":{"authorlinks":{}}},"bibtype":"article","biburl":"https://bibbase.org/zotero/polyphant","dataSources":["7gvjSdWrEu7z5vjjj"],"keywords":["astrophysics - astrophysics of galaxies"],"search_terms":["identification","galaxies","experienced","recent","major","drop","star","formation","ciesla","elbaz","schreiber","daddi","wang"],"title":"Identification of galaxies that experienced a recent major drop of star formation","year":2018}