Astrobites graduate-student run outreach & science writing - - PowerPoint PPT Presentation
Astrobites graduate-student run outreach & science writing program Ian Czekala Elisabeth Newton Courtney Dressing Sukrit Ranjan Maria Drout Nathan Sanders Chris Faesi ...on behalf of Astrobites Introducing Astrobites Chris Faesi
graduate-student run
Ian Czekala Elisabeth Newton Courtney Dressing Sukrit Ranjan Maria Drout Nathan Sanders Chris Faesi ...on behalf of Astrobites
Chris Faesi
Gas Accretion is Dominated by Warm Ionized Gas in Milky Way-Mass Galaxies at z ~ 0
We perform high-resolution hydrodynamic simulations of a Milky Way-mass galaxy in a fully cosmological setting using the adaptive mesh refinement code, Enzo, and study the kinematics of gas in the simulated galactic halo. We find that the gas inflow occurs mostly along filamentary structures in the halo. The warm-hot (105 K < T < 106 K) and hot (T > 106 K) ionized gases are found to dominate the overall mass accretion in the system (with dM/dt = 3-5 M_solar/yr) over a large range of distances, extending from the virial radius to the vicinity of the disk. Most of the inflowing gas (by mass) does not cool, and the small fraction that manages to cool does so primarily close to the galaxy (R <~ 20 kpc), perhaps comprising the neutral gas that may be detectable as, e.g., high-velocity clouds. The neutral clouds are embedded within larger, accreting filamentary flows, and represent only a small fraction of the total mass inflow rate. The inflowing gas has relatively low metallicity (Z/Z_solar < 0.2). The outer layers of the filamentary inflows are heated due to compression as they approach the disk. In addition to the inflow, we find high-velocity, metal-enriched outflows of hot gas driven by supernova feedback. Our results are consistent with observations of halo gas at low z.
Peek (Columbia U)
source: arxiv.org/archive/astroph
Gas Accretion is Dominated by Warm Ionized Gas in Milky Way-Mass Galaxies at z ~ 0
We perform high-resolution hydrodynamic simulations of a Milky Way-mass galaxy in a fully cosmological setting using the adaptive mesh refinement code, Enzo, and study the kinematics of gas in the simulated galactic halo. We find that the gas inflow occurs mostly along filamentary structures in the halo. The warm-hot (105 K < T < 106 K) and hot (T > 106 K) ionized gases are found to dominate the overall mass accretion in the system (with dM/dt = 3-5 M_solar/yr) over a large range of distances, extending from the virial radius to the vicinity of the disk. Most of the inflowing gas (by mass) does not cool, and the small fraction that manages to cool does so primarily close to the galaxy (R <~ 20 kpc), perhaps comprising the neutral gas that may be detectable as, e.g., high-velocity clouds. The neutral clouds are embedded within larger, accreting filamentary flows, and represent only a small fraction of the total mass inflow rate. The inflowing gas has relatively low metallicity (Z/Z_solar < 0.2). The outer layers of the filamentary inflows are heated due to compression as they approach the disk. In addition to the inflow, we find high-velocity, metal-enriched outflows of hot gas driven by supernova feedback. Our results are consistent with observations of halo gas at low z.
Peek (Columbia U)
source: arxiv.org/archive/astroph
...
Understandable title Category links Direct link to astro-ph article ...
○ provide daily summaries of recent papers ○ cover astronomy news
○ provide context and technical background ○ break down the "wall of jargon" ○ research: behind-the-scenes
○ the next generation of scientists ○ interest in astronomy
institutions worldwide
institutions worldwide
Ian Czekala
"[E]nterprising grad students at Harvard have [created] astrobites ... It’s aimed at undergrads, but I don’t see any reason it can’t be used by any level
undergrad to pro." - Phil Plait
Sukrit Ranjan
○ What's going on? ○ Why do we care?
some!
... ... ... ...
... Supernova 1994D, via Hubble
current events
○ Kepler space mission extension
Experiences
○ Conferences ○ Gap years
Advice
○ How to get into grad school ○ Mental Health
Jackson Hole, WY/ESS II Conference
Courtney Dressing
but we’re a little too far apart.
We’d love to meet in person
but we're a little too far apart.
but we’re a little too far apart.
Conferences Editorial Glossaries Hiring Meeting Public Relations Scheduling Special Projects Website Administrative Board
Author Content Editor Style Editor
but we’re a little too far apart.
but we’re a little too far apart.
http://cosmology.berkeley.edu/
Maria Drout
Assess with:
April, 2012:
BUT... 67% of readers access astrobites through an e-mail alert system.
"You guys rock! I'd love to be part of astrobites someday when I get to grad school!"
March - April, 2012: 76,000 visits
Oct - Nov, 2011: 23,000 visits, 102 countries
County Totals: USA: 13,800 UK: 1,800 Canada: 1,000 Germany: 700 Australia: 500 ... Maldives: 1 Qatar: 1 Namibia:1
March - April, 2012: 130,000 visits, 153 countries
County Totals: USA: 76,000 UK: 9,000 Canada: 8,000 Germany: 4,000 Australia: 3,000 ... Kenya: 17 Tanzania: 6 Mongolia: 5
Elisabeth Newton
○ Engaging the community ○ Interacting more regularly
○ Sharing our experiences ○ Contributing in new ways ○ Advertising Astrobites,
reaching undergraduates
Referrals from reddit over the last 3 months
○ Telescopes and missions ○ General interest ○ Current research in the news
30,000
○ Half international ○ 80% between the ages of 18 and 34
hundred daily
Referrals from Facebook over the last 3 months
200
○ Professional astronomers ○ Astronomy enthusiasts ○ Science journalists
referrals, more reach
What is it like to attend a conference?
attending press conferences
sharing with the community, reaching undergraduates
Nathan Sanders
http://chembites.org
http://chembites.org http://astroleaks.lamost.org/
http://chembites.org http://astroleaks.lamost.org/ http://biobotbites.org/
http://chembites.org http://astroleaks.lamost.org/ http://biobotbites.org/ http://cogbites.wordpress.com/
http://chembites.org http://astroleaks.lamost.org/ http://biobotbites.org/ http://cogbites.wordpress.com/ Physbites? Pharmabites? Geobites?
Article for Astronomy Education Review
to learn science writing skills
○ Science journalists ○ Education and public outreach
specialists
○ Alyssa Goodman (Harvard) ○ Marcia Bartusiak (MIT)
Thank you!
Ian Czekala Elisabeth Newton Courtney Dressing Sukrit Ranjan Maria Drout Nathan Sanders Chris Faesi ...on behalf of Astrobites
Special thanks to AAS, NSF, Elisabeth Nunez