Resolving 3D Disk Orientation using High-Resolution Images: New Constraints on Circumgalactic Gas Inflows

We constrain gas inflow speeds in star-forming galaxies with color gradients consistent with inside-out disk growth. Our method combines new measurements of disk orientation with previously described circumgalactic absorption in background quasar spectra. Two quantities, a position angle and an axis ratio, describe the projected shape of each galactic disk on the sky, leaving an ambiguity about which side of the minor axis is tipped toward the observer. This degeneracy regarding the 3D orientation of disks has compromised previous efforts to measure gas inflow speeds. We present HST and Keck/LGSAO imaging that resolves the spiral structure in five galaxies at redshift $z\approx0.2$. We determine the sign of the disk inclination for four galaxies, under the assumption that spiral arms trail the rotation. We project models for both radial infall in the disk plane and circular orbits onto each quasar sightline. We compare the resulting line-of-sight velocities to the observed velocity range of Mg II absorption in spectra of background quasars, which intersect the disk plane at radii between 69 and 115 kpc. For two sightlines, we constrain the maximum radial inflow speeds as 30-40 km s$^{-1}$. We also rule out a velocity component from radial inflow in one sightline, suggesting that the structures feeding gas to these growing disks do not have unity covering factor. We recommend appropriate selection criteria for building larger samples of galaxy--quasar pairs that produce orientations sensitive to constraining inflow properties.Comment: 15 pages with 8 figures and 2 tables; accepted for publication in Ap

Nurturing Self: Psychotherapeutic Implications of Women\u27s Reflections on the Meaning of their Cherished Possessions

Experiencing the importance of one’s personal treasures is ubiquitous to the human experience, but what is the depth and meaning of this lived phenomenon? An interpretive phenomenological method was used to explore the meaning and significance of women’s experience of their cherished personal possessions. Nine women participated in three individual semi-structured phenomenological interviews each. Interpretive analysis revealed that women’s experience of their cherished personal possessions is one of nurturing self. Through their cherished personal possessions, women nurture their sense of self by connecting with others, affirming personal experience, supporting self through change, and cultivating a sense of self. Implications for responsive psychotherapeutic practice with women clients are identified

Memory for elements of a complex scene : binding and the influence of attention

Memory of a complex event includes a multitude of features (e.g., objects, people, and actions) as well as the overall context (e.g., going to a picnic). To recall a complex event you must bind together these features and context into an episodic memory representation. This process of binding creates the subjective experience that certain details belong together. In two experiments, I examined whether particular types of information are bound together (object-to-object, object-to-context) within a memory representation of a scene and how attention may influence this process. Participants viewed a series of scenes and their attention was drawn to some objects (focus of attention), but not others. At test, they attempted to identify previously seen objects that were cued by objects-only, context-only, or a blurred context. Exp. 1 provided evidence of object-to-object binding when the objects used as cues and targets had been in the focus of attention at encoding. Exp. 2 revealed evidence of object-to-context binding, in that context cues enhanced memory for target objects whether or not the objects had been in the focus of attention at encoding. Altogether, these studies demonstrate the importance of attentional deployment in determining which components of an episodic memory will bind together

Kinematics of Circumgalactic Gas: Feeding Galaxies and Feedback

We present observations of 50 pairs of redshift z ~ 0.2 star-forming galaxies and background quasars. These sightlines probe the circumgalactic medium (CGM) out to half the virial radius, and we describe the circumgalactic gas kinematics relative to the reference frame defined by the galactic disks. We detect halo gas in MgII absorption, measure the equivalent-width-weighted Doppler shifts relative to each galaxy, and find that the CGM has a component of angular momentum that is aligned with the galactic disk. No net counter-rotation of the CGM is detected within 45 degrees of the major axis at any impact parameter. The velocity offset of the circumgalactic gas correlates with the projected rotation speed in the disk plane out to disk radii of roughly 70 kpc. We confirm previous claims that the MgII absorption becomes stronger near the galactic minor axis and show that the equivalent width correlates with the velocity range of the absorption. We cannot directly measure the location of any absorber along the sightline, but we explore the hypothesis that individual velocity components can be associated with gas orbiting in the disk plane or flowing radially outward in a conical outflow. We conclude that centrifugal forces partially support the low-ionization gas and galactic outflows kinematically disturb the CGM producing excess absorption. Our results firmly rule out schema for the inner CGM that lack rotation and suggest that angular momentum as well as galactic winds should be included in any viable model for the low-redshift CGM.Comment: Accepted for publication in the Astrophysical Journa

How Gas Accretion Feeds Galactic Disks

Numerous observations indicate that galaxies need a continuous gas supply to fuel star formation and explain the star formation history. However, direct observational evidence of gas accretion remains rare. Using the EAGLE cosmological hydrodynamic simulation suite, we study cold gas accretion onto galaxies and the observational signatures of the cold gas kinematics. For EAGLE galaxies at z=0.27, we find that cold gas accretes onto galaxies anisotropically with typical inflow speeds between 20 km s$^{-1}$ and 60 km s$^{-1}$. Most of these galaxies have comparable mass inflow rates and star formation rates, implying that the cold inflowing gas plausibly accounts for sustaining the star-forming activities of the galaxies. As motivation for future work to compare the cold gas kinematics with measurements from quasar sightline observations, we select an EAGLE galaxy with an extended cold gas disk, and we probe the cold gas using mock quasar sightlines. We demonstrate that by viewing the disk edge-on, sightlines at azimuthal angles below 10$^{\circ}$ and impact parameters out to 60 pkpc can detect cold gas that corotates with the galaxy disk. This example suggests cold gas disks that extend beyond the optical disks possibly explain the sightline observations that detect corotating cold gas near galaxy major axes.Comment: 24 pages, 16 figures; accepted by Ap

The Power of Personal Experiences : Post-Publication Experiences of Researchers Using Autobiographical Data

Although much has been written about the challenging writing process associated with autobiographical research, little is known about the post-publications consequences of using personal experience as a primary source of data. This psychology honour’s project used an online survey to investigate the question: What are researchers’ experiences and perspectives after publishing research that used autobiographical materials as the primary source of data? The participants were 13 individuals who had published at least two autobiographical peer-reviewed articles and the method was qualitative description using content analysis. Primarily positive findings were identified (e.g., career advancement, professional and personal validation, perceived strengthened relationships with others) although some participants continued to wonder about decisions related to their autobiographical publications (e.g., privacy of third parties, what content to include or exclude) and about the reactions of others (e.g., readers, loved ones). Findings underscore how using personal experience as data blurs the borders of scholarship and personal growth, and directly impacts audiences. Implications include tips for those interesting in doing autobiographical research

Morphological and Rotation Structures of Circumgalactic Mg II Gas in the EAGLE Simulation and the Dependence on Galaxy Properties

Low-ionization-state Mg II gas has been extensively studied in quasar sightline observations to understand the cool, $\sim$$10^4$ K gas in the circumgalactic medium. Motivated by recent observations showing that the Mg II gas around low-redshift galaxies has significant angular momentum, we use the high-resolution EAGLE cosmological simulation to analyze the morphological and rotation structures of the $z\approx0.3$ circumgalactic Mg II gas and examine how they change with the host galaxy properties. Around star-forming galaxies, we find that the Mg II gas has an axisymmetric instead of a spherical distribution, and the axis of symmetry aligns with that of the Mg II gas rotation. A similar rotating structure is less commonly found in the small sample of simulated quiescent galaxies. We also examine how often Mg II gas around galaxies selected using a line-of-sight velocity cut includes gas physically outside of the virial radius ($r_\mathrm{vir}$). For example, we show that at an impact parameter of 100 pkpc, a $\pm500$ km s$^{-1}$ velocity cut around galaxies with stellar masses of $10^9$-$10^{9.5}\mathrm{M_\odot}$ ($10^{10}$-$10^{10.5}\mathrm{M_\odot}$) selects Mg II gas beyond the virial radius 80% (6%) of the time. Because observers typically select Mg II gas around target galaxies using such a velocity cut, we discuss how this issue affects the study of circumgalactic Mg II gas properties, including the detection of corotation. While the corotating Mg II gas generally extends beyond $0.5r_\mathrm{vir}$, the Mg II gas outside of the virial radius contaminates the corotation signal and makes observers less likely to conclude that gas at large impact parameters (e.g., $\gtrsim0.25 r_\mathrm{vir}$) is corotating.Comment: 26 pages with 18 figures and 3 tables; accepted for publication in Ap

Comparison of Crystal Structures of the Tetramethylammonium and Sodium Salts of 3-Nitrophenolate

The addition of either sodium hydroxide or tetramethylammonium hydroxide to 3-nitrophenol led to orange-red crystals of sodium 3-nitrophenolate dihydrate or a complex of 3-nitrophenol and tetramethylammonium 3-nitrophenolate. For the sodium salt, 11707 Mo-Kα reflections were measured at 150 K via Bruker SMART 1-K CCD diffractometer. For the tetramethylammonium salt, 12664 Mo-Kα reflections were measured at 173 K via Bruker SMART 2-K CCD diffractometer. The unit cell of the sodium salt has: a = 6.814(1) Å, b = 6.5437(8) Å, c = 18.206(4) Å, β = 94.46(3)°, V = 809.4(3) Å3, space group = P21/n. The unit cell of the tetramethylammonium salt has: a = 23.543(4) Å, b = 5.636(1) Å, c = 16.387(3) Å, β = 128.513(3)°, V = 1701.4(9) Å3, space group = C2/c. The bond lengths of the 3-nitrophenolate moiety were statistically the same in the two crystal structures, showing that it is not affected by the cation

Cigarette Smoke Suppresses Type I Interferon-Mediated Antiviral Immunity in Lung Fibroblast and Epithelial Cells

The objective of this study was to investigate the impact of cigarette smoke on innate antiviral defense mechanisms; specifically, we examined the effects of cigarette smoke on the induction of type I interferon (IFN). We observed a dose-dependent decrease in the ability of human lung fibroblast and epithelial cells to elicit an antiviral response against a viral double-strand RNA (dsRNA) mimic, polyI:C, in the presence of cigarette smoke-conditioned medium (SCM). Mechanistically, SCM decreases the expression of IFN-stimulated gene 15 (ISG15) and IFN regulatory factor-7 (IRF-7) transcripts and suppresses the nuclear translocation of key transcription factors, nuclear factor-κB (NF-κB) and IRF-3, after polyI:C stimulation. Furthermore, we provide evidence that the intercellular defense strategy against viral infection is also impaired. We observed a decrease in the ability of fibroblasts to elicit an antiviral state in response to IFN-β stimulation. This was associated with decreased nuclear translocation of phosphorylated Stat1 in response to IFN-β treatment. The effects elicited by SCM are reversible and are almost entirely abrogated in the presence of an antioxidant, such as glutathione. Our findings suggest that cigarette smoke affects the immediate-early, inductive, and amplification phases of the type I IFN response

Improving the care of people with dementia in general hospitals: evaluation of a whole-system train the trainer model

Background: There are concerns about the quality of care that people with dementia receive in the general hospital. Staff report a lack of confidence and inadequate training in dementia care. Methods: A train-the-trainer model was implemented across eight acute hospital trusts in London via a large academic health and science network. Impact was evaluated using mixed methods. Data was collected at (a) Individual level: ‘Sense of Competence in Dementia Care’ (SCID) (b) Ward level: Person Interaction and Environment (PIE) observations (c) Organisation level: use of specific tools i.e. “This Is Me”, (d) Systems level: numbers and types of staff trained per trust. Results were analysed with descriptive statistics and paired t-test with thematic framework analysis for PIE observations. Results: Number of staff trained per trust ranged from 67 to 650 (total 2,020). 1,688 (85%) baseline questionnaires and 456 (27%) 3 month follow-up questionnaires were completed. Mean SCID score was 43.2 at baseline and 50.7 at follow-up (paired t-test, p<0.001). All sub-scales showed a small increase in competence, the largest being for ‘building relationships’. Organisational level data suggested increased use of carer’s passport, “This Is Me” documentation, dementia information leaflets, delirium screening scales and pathways. PIE observations demonstrated improved staff-patient interactions but little change in hospital environments. Conclusions: There was a significant improvement in staffs’ sense of competence in dementia care and the quality of interactions with patients. More hospitals adopted person centred tools and pathways. Work is required to investigate if these changes improve hospital outcomes for people with dementia