Nikole M. Nielsen

MAGIICAT II. GENERAL CHARACTERISTICS OF THE Mg II ABSORBING CIRCUMGALACTIC MEDIUM

We examine the MgII absorbing circumgalactic medium (CGM) for the 182 intermediate redshift (0.072≤ z ≤ 1.120) galaxies in the “Mg II Absorber-Galaxy Catalog” (MAGIICAT, Nielsen et al.). We parameterize the anti-correlation between equivalent width, Wr(2796), and impact parameter, D, with a log-linear fit, and show that a power law poorly describes the data. We find that hi gher luminosity galaxies have larger Wr(2796) at larger D (4.3 �). The covering fractions, fc, decrease with increasing D and Wr(2796) detection threshold. Higher luminosity galaxies have larger fc; no absorption is detected in lower luminosity galaxies bey ond 100 kpc. Bluer and redder galaxies have similar fc for D 100 kpc, bluer galaxies have larger fc, as do higher redshift galaxies. The “absorption radius,” R(L) = R�(L/L � ) � , which we examine for four different Wr(2796) detection thresholds, is more luminosity sensitive to the B-band than the K-band, more sensitive for redder galaxies than for bluer galaxies, and does not evolve with redshift for the K-band, but becomes more luminosity sensitive towards lower redshift for the B-band. These trends clearly indicate a more extended MgII absorbing CGM around higher luminosity, bluer, and higher redshift galaxies. Several of our findings are in conflict with other works. We address these con flicts and discuss the implications of our results for the low-ionization, intermediate redshift CGM. Subject headings:galaxies: halos — quasars: absorption lines

MAGIICAT I. THE Mg II ABSORBER-GALAXY CATALOG

We describe the MgII Absorber-Galaxy Catalog, MAGIICAT, a compilation of 182 spectroscopically identified intermediate redshift (0.07 0.3 Ang], low redshift (z zmed), where zmed = 0.359 is the median galaxy redshift. Rest-frame color B-K correlates with M_K at the 8 sigma level for the whole sample but is driven by the strong absorbing, high redshift subsample (6 sigma). Using M_K as a proxy for stellar mass and examining the luminosity functions, we infer that in lower stellar mass galaxies, MgII absorption is preferentially detected in blue galaxies and the absorption is more likely to be weak.

THE AZIMUTHAL DEPENDENCE OF OUTFLOWS AND ACCRETION DETECTED USING O vi ABSORPTION

We report a bimodality in the azimuthal angle (

MAGiiCAT V. ORIENTATION OF OUTFLOWS AND ACCRETION DETERMINE THE KINEMATICS AND COLUMN DENSITIES OF THE CIRCUMGALACTIC MEDIUM

\Phi

Quenched Cold Accretion of a Large-scale Metal-poor Filament due to Virial Shocking in the Halo of a Massive z = 0.7 Galaxy

) distribution of gas around galaxies traced by OVI absorption. We present the mean

MAGiiCAT IV. kinematics of the circumgalactic medium and evidence for quiescent evolution around Red Galaxies

\Phi

THE REDSHIFT DISTRIBUTION OF INTERVENING WEAK Mg II QUASAR ABSORBERS AND A CURIOUS DEPENDENCE ON QUASAR LUMINOSITY

probability distribution function of 29 HST-imaged OVI absorbing (EW>0.1A) and 24~non-absorbing (EW<0.1A) isolated galaxies (0.08<z<0.67) within 200kpc of background quasars. We show that EW is anti-correlated with impact parameter and OVI covering fraction decreases from 80% within 50kpc to 33% at 200kpc. The presence of OVI absorption is azimuthally dependent and occurs between

The Highly Ionized Circumgalactic Medium is Kinematically Uniform around Galaxies

\pm10-20^{\circ}

Gas kinematics in the multiphase circumgalactic medium

of the galaxy projected major axis and within

TRACING OUTFLOWS AND ACCRETION: A BIMODAL AZIMUTHAL DEPENDENCE OF Mg II ABSORPTION

\pm30^{\circ}