English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

The size and mass of two circum-galactic medium (CGM) clouds in the halo(impact parameter = 65 kpc) of a nearby late-type galaxy, MGC-01-04-005 ($cz =1865$ km/s), are investigated using a close triplet of QSO sight lines (the"LBQS Triplet"; Crighton et al. 2010). Far ultraviolet spectra obtained withthe Cosmic Origins Spectrograph (COS) aboard the Hubble Space Telescope (HST)find two velocity components in Lyman $\alpha$ at $\sim1830$ and 1900 km/s intwo of these sight lines, requiring minimum transverse cloud sizes of $\geq10$kpc. A plausible, but not conclusive, detection of CIV 1548 \AA\ absorption atthe higher velocity in the third sight line suggests an even larger lower limitof $\geq23$ kpc for that cloud. Using various combinations of constraints,including photo-ionization modeling for one absorber, lower limits on masses ofthese two clouds of $\geq10^6$ M_Sun are obtained. Ground-based imaging andlong-slit spectroscopy of MCG -01-04-005 obtained at the Apache PointObservatory (APO) 3.5m telescope find it to be a relatively normal late-typegalaxy with a current star formation rate (SFR) of $\sim0.01$ M_Sun per year.Galaxy Evolution Explorer (GALEX) photometry finds an SFR only a few timeshigher over the last $10^8$ yrs. We conclude that the CGM clouds probed bythese spectra are typical in being at impact parameters of 0.4-0.5 R_vir from arather typical, non-starbursting late-type galaxy so that these size and massresults should be generic for this class. Therefore, at least some CGM cloudsare exceptionally large and massive.

On the Size and Mass of Photo-ionized Clouds in Extended Spiral Galaxy Halos