4 research outputs found
ZFIRE: Similar Stellar Growth in Hα-emitting Cluster and Field Galaxies at z ~ 2
We compare galaxy scaling relations as a function of environment at
with our ZFIRE survey where we have measured H fluxes for 90
star-forming galaxies selected from a mass-limited
[] sample based on ZFOURGE. The cluster galaxies
(37) are part of a confirmed system at z=2.095 and the field galaxies (53) are
at ; all are in the COSMOS legacy field. There is no statistical
difference between H-emitting cluster and field populations when
comparing their star formation rate (SFR), stellar mass (), galaxy
size (), SFR surface density [(H)], and stellar
age distributions. The only difference is that at fixed stellar mass, the
H-emitting cluster galaxies are larger than in
the field. Approximately 19% of the H-emitters in the cluster and 26%
in the field are IR-luminous (). Because the
LIRGs in our combined sample are times more massive than the low-IR
galaxies, their radii are % larger. To track stellar growth, we
separate galaxies into those that lie above, on, and below the H
star-forming main sequence (SFMS) using SFR dex.
Galaxies above the SFMS (starbursts) tend to have higher H SFR surface
densities and younger light-weighted stellar ages compared to galaxies below
the SFMS. Our results indicate that starbursts (+SFMS) in the cluster and field
at are growing their stellar cores. Lastly, we compare to the
(SFR-) relation from RHAPSODY cluster simulations and find the
predicted slope is nominally consistent with the observations. However, the
predicted cluster SFRs tend to be too low by a factor of which seems to
be a common problem for simulations across environment.Comment: ApJ in press; full version of Table 1 available from ApJ and upon
request. Survey websites are http://zfire.swinburne.edu.au and
http://zfourge.tamu.ed
Medical Risks for Women Who Drink Alcohol
OBJECTIVE: To summarize for clinicians recent epidemiologic evidence regarding medical risks of alcohol use for women. METHODS: MEDLINE and PsychINFO, 1990 through 1996, were searched using key words âwomenâ or âwoman,â and âalcohol.â MEDLINE was also searched for other specific topics and authors from 1980 through 1996. Data were extracted and reviewed regarding levels of alcohol consumption associated with mortality, cardiovascular disease, alcohol-related liver disease, injury, osteoporosis, neurologic symptoms, psychiatric comorbidity, fetal alcohol syndrome, spontaneous abortion, infertility, menstrual symptoms, breast cancer, and gynecologic malignancies. Gender-specific data from cohort studies of general population or large clinical samples are primarily reviewed. MAIN RESULTS: Women develop many alcohol-related medical problems at lower levels of consumption than men, probably reflecting women's lower total body water, gender differences in alcohol metabolism, and effects of alcohol on postmenopausal estrogen levels. Mortality and breast cancer are increased in women who report drinking more than two drinks daily. Higher levels of alcohol consumption by women are associated with increased menstrual symptoms, hypertension, and stroke. Women who drink heavily also appear to have increased infertility and spontaneous abortion. Adverse fetal effects occur after variable amounts of alcohol consumption, making any alcohol use during pregnancy potentially harmful. CONCLUSIONS: In general, advising nonpregnant women who drink alcohol to have fewer than two drinks daily is strongly supported by the epidemiologic literature, although specific recommendations for a particular woman should depend on her medical history and risk factors