Latest Space News
Sun, 17 Nov 2019 23:42:07 +0000
Maj. Gen. Stephen Whiting said the transfer of space traffic management responsibilities can't happen until Commerce gets the necessary resources. SpaceNews.com
Fri, 15 Nov 2019 22:36:16 +0000
The 10-year contract is for operations and support of the Advanced Extremely High Frequency, Milstar and Defense Satellite Communications System constellations. SpaceNews.com
Fri, 15 Nov 2019 18:51:17 +0000
Exos Aerospace said the failed launch of a reusable suborbital sounding rocket last month was caused by a structural failure of the rocket shortly after liftoff. SpaceNews.com
Fri, 15 Nov 2019 12:28:02 +0000
NASA’s inspector general warned in a new report that, because of commercial crew delays, utilization of the International Space Station will drop sharply in 2020 and that NASA runs the risk of losing access entirely by next fall. SpaceNews.com
Thu, 14 Nov 2019 23:52:00 +0000
EchoStar has ordered two tiny S-band satellites from Tyvak Nano-Satellite Systems to jumpstart a low-Earth-orbit constellation using spectrum gained through its October acquisition of IoT startup Helios Wire.  SpaceNews.com
Thu, 14 Nov 2019 22:06:27 +0000
NASA paid Boeing nearly $300 million more than originally planned in its commercial crew contract in part because of agency concerns that the company might drop out of the program, a new report claims. SpaceNews.com
Thu, 14 Nov 2019 21:47:58 +0000
SDA is the new term replacing Space Situational Awareness, according to an Oct. 4 memo from Air Force Space Command. SpaceNews.com
Thu, 14 Nov 2019 20:29:46 +0000
Loft Orbital has raised a fresh $13 million to continue development of a constellation of small satellites purpose-built to carry a mix of payloads for customers who don’t want to fly their own satellites.  SpaceNews.com
Thu, 14 Nov 2019 17:19:54 +0000
With growing bipartisan skepticism that NASA’s current plan to return humans to the moon by 2024 is achievable, members of the House Science Committee used a Nov. 13 hearing to advocate for a different, and arguably more conventional, approach. SpaceNews.com
Thu, 14 Nov 2019 12:04:44 +0000
SpaceX successfully tested Nov. 13 the thrusters used as part of the abort system for its Crew Dragon spacecraft, nearly seven months after a similar test resulted in the loss of another spacecraft. SpaceNews.com
Thu, 14 Nov 2019 04:49:10 +0000
The Senate Commerce Committee approved Nov. 13 a NASA authorization bill introduced a week earlier to extend the life of the International Space Station and support other agency programs. SpaceNews.com
Thu, 14 Nov 2019 01:37:18 +0000
Launcher won its first government funding when the U.S. Air Force awarded the the Brooklyn-based startup $1.5 million to accelerate development and testing of its E-2 rocket engine. SpaceNews.com
Wed, 13 Nov 2019 22:52:54 +0000
Chairman Adam Smith said House-Senate divide is deepening over the establishment of a Space Force SpaceNews.com
Wed, 13 Nov 2019 21:01:43 +0000
Mark Rigolle, CEO of LeoSat, told SpaceNews Nov. 13 that the company laid off all 13 employees — himself included — in August after its earlier investors decided not to fund the company any longer.  SpaceNews.com
Wed, 13 Nov 2019 19:41:33 +0000
Isotropic Systems has completed two-way communications tests of its electronically steered antenna using Avanti’s Hylas-4 satellite. SpaceNews.com
Wed, 13 Nov 2019 17:48:11 +0000
In its ongoing quest to increase launch vehicle production, Rocket Lab has unveiled a new industrial robotic system designed to speed up manufacturing of its Electron rocket. SpaceNews.com
Wed, 13 Nov 2019 17:03:25 +0000
The former chairman of the House aviation subcommittee and adviser to United Launch Alliance argues that all commercial spaceflight companies should support, rather than disrupt, the FAA's ongoing effort to streamline existing launch licensing processes. SpaceNews.com
Wed, 13 Nov 2019 12:56:40 +0000
China launches six remote sensing satellites into orbit with two launches inside three hours from sites in north China. SpaceNews.com
Wed, 13 Nov 2019 11:00:40 +0000
A new study says companies can build, launch and operate constellations to gather global imagery with a resolution of one meter for a fraction of the cost of previous constellations. SpaceNews.com
Wed, 13 Nov 2019 10:29:40 +0000
A NASA official warned that extended delays in finalizing a fiscal year 2020 budget for the agency could have implications for its ability to stay on schedule for returning humans to the moon in 2024. SpaceNews.com
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  • CV: PhD Student

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    Personal information
     Name:<withheld>
     Age:<withheld>
     Country:<withheld>
     Location:<withheld>
    Contact information
     Email:<withheld>
     Phone:<withheld>
     Mobile:<withheld>
    Candidate Profile
     Date Submitted:11-02-2013
     Last Modified:11-02-2013 (07:57)
    Job information
     Current job:PhD Student
     Employment Term:Temp/Contract
     Job location:Anywhere
     Date available:>3months
     Industry:Civil Agencies/International Organizations, Satellite Manufacturers and Subcontractors, Satellite Operators, , , Launch Systems, Business Services
     KeywordsPhD in astrophysics at Stanford University. Long term experience with astronomical data analysis and statistics.
    CV

    Personal

    Born on 29 November, 1984
    United States Citizen
    Speaks English (native) and German (fluent)



    Education

    Ph.D. Astrophysics, Stanford University, 2008-Present. Advisor: Steven Allen

    DAAD Research Fellowship, Max Planck Institute for Nuclear Physics, 2007-2008. Advisor: Werner Hofmann

    B.S. Physics and Mathematics, (Magna Cum Laude), Northwestern University, 2003-2007. Advisor: Melville Ulmer


    Awards and Fellowships

     German Academic Exchange Program (DAAD) Research Fellowship, 2007-2008
     Phi Beta Kappa Honors Society
     Outstanding Undergraduate Honors Thesis, Physics Department, Northwestern University, 2007



    Talks and Proceedings

     Ehlert, S.; et al,,  "X-ray Bright AGN in the Vicinity of Massive Galaxy Clusters", Half a Century of X-Ray Astronomy, Myknonos Island Greece, September 2012

     Ehlert, S.; et al., "Extreme AGN Feedback in the most X-ray luminous cooling cores: MACSJ1931.8-2634", Snowcluster, Snowbird UT, March 2010

     Becherini, Y.; Djannati-Atai, A.; Punch, M.; Bernl"{o}hr, K.; Ehlert, S. ; Masbou, J.; Moulin, E.; Arribas, M. Paz, "HESS-II reconstruction strategy and performance in the low-energy (20-150 GeV) domain", 4th Meeting on High Energy Gamma Ray Astronomy , Heidelberg Germany, August 2008

    Ehlert, S.; and Ulmer, M.P., "Iron Abundance and Temperature Gradients in High Redshift Galaxy Clusters", Meeting of the American Astronomical Society , Seattle WA, January 2007

    Successful Observing Proposals


    Spring 2012: ``An inside view: Does the fraction of X-ray AGN track the quenching of star formation in cluster galaxies?'', {it ESO VLT Period 90}, Anja von der Linden PI, 42 hours, 10 clusters

     

    Spring 2012: ``Tracing a Merger from Start to Finish in Abell 85'' {it Chandra Cycle 14} joint with {it Suzaku}, Steve Allen Funding PI, Steven Ehlert Observing Co-I, 160+100 ks. 

    Fall 2010: ``The Deep Impact of AGN Feeback in M84'' {it XMM-Newton Cycle 10} joint with {it VLT}, Steven Ehlert PI, 130 ks+2 hours. 

    Fall 2010: ``MACS J1931.8-2634: Destruction of a cluster cool core in technicolor'', {it ESO VLT Period 87A}, Anja von der Linden PI, 15 hours

    Teaching


    Center for Teaching and Learning Liason, Physics Department, 2012-2013 

    Teaching Assistant Mentor, Physics Department, 2011-2012

    Spring Quarter 2012: Physics 100, Teaching Assistant

    Spring Quarter 2011: Physics 100/301, Teaching Assistant

     Fall Quarter 2009: Physics 45 (Thermodynamics and Optics), Head Teaching Assistant

     Winter Quarter 2009: Physics 41 (Mechanics), Section Teaching Assistant.

    Further details on Teaching Positions:


    The Physics 40 series (41,43,and 45) at Stanford is a series of introductrory Physics courses that require the use of calculus. These courses are mandatory for young physics majors and most fields of engineering, and typical enrollment is approximately 300-400 students per quarter. Teaching assistants are typically given two sections of 18 students each for whom they supervise in a weekly 1 hour recitation section. The section teaching assistants are also responsible for grading problem sets and being the first contact for students when questions or concerns arise. All of the section teaching assistants are supervised by a head teaching assistant who communicates more directly with the instructor. The head teaching assistant's responsibilities include writing problem sets and examinations, providing vision and guidance to the section teaching assistants, and managing the unique administrative tasks that arise in a class of 300+ students.


    Physics 100 at Stanford is laboratory-based observational astronomy course utilizing the 0.4 and 0.6 m telescopes at the Stanford Student Observatory. Every other year the course is also open to graduate students (known as Physics 301). We teach the fundamentals of observational astronomy, statistics, and data analysis using an analysis pipeline built from scratch combined with new and archival telescope data. The course culminates with the students proposing and performing their own original research projects utilizing telescope data from the Stanford Student Observatory or other public archives. Previous projects of note include reconstructing satellite orbits from CCD image streaks and the detections of an extra-solar planet using the transit method.     


    The Physics Department at Stanford, in order to make their instruction more effective for undergraduate students, works closely with the Center for Teaching and Learning (CTL) at Stanford University in order to maintain a high standard of teaching across all classes. One of the key components of this program is the Teaching Assistant (TA) Mentor program, where experienced TA's are assigned to help provide insight and advice to new TA's as needed. Additionally, the Mentor TA's also perform mid-quarter evaluations of their mentee TA's, which allow the new TA's the opportunity to adjust their teaching strategies before the end of the quarter. One Mentor TA in particular is chosen to represent the department as the liason to the CTL, and help promote the exchange of ideas between the Physics Department and CTL. The CTL liason also, in conjunction with the CTL, helps develop new teaching approaches for the Physics department based on the departments particular needs and previous experience.

     
    Additional Service

    Representative to Congressional Offices, SLAC User's Organization, SLAC National Accelerator Laboratory



    Further Details on Service Positions:


    In March of 2012, I served as a member of the Slac Users Organization (SLUO, SLAC National Accelerator Laborary, Menlo Park CA) on their annual trip to Washington D.C. in order to thank members of the United States Congress for their continued support for high energy particle physics and astrophysics. Additionally, we spoke to the Congressional offices to emphasize the importance of stable, healthy long-term funding to our community and the United States at large and the broader impacts that cutting edge pure science research. This trip is undertaken every year along with representatives from Fermilab and the US users of the Large Hadron Collider. Over the course of two days in Washington DC, I spoke with 13 Congressional Offices in the U.S. House of Representatives and Senate as well as directors of the National Science Foundation and Department of Energy.   




    Skills and Competencies

    Computer Languages: Bash and C-Shell, Python, IDL, C++

    Machine Shop: Bandsaw, Lathe, Milling Machine



    Publications

    Journal Articles
    All of these articles have been accepted for publication in peer-reviewed journals.


    {bf Ehlert, S.}; Allen, S.W.; von der Linden, A.; Werner, N.; Simionescu, Kenney, J.D.P.; A.; Million, E. T.; Finoguenov, A.; ``Ripping at the Seams: The Network of Stripped Gas Surrounding M86'', accepted by MNRAS, arXiv # 1212.3612

    {bf Ehlert, S.}; Allen, S.W.; Brandt, W.N.; Xue, Y.Q.; Luo, B.; von der Linden, A.; Mantz, A.; and  Morris, R. G. ``X-ray Bright Active Galactic Nuclei in Massive Galaxy Clusters I: Number Counts and Spatial Distribution'', Monthly Notices of the Royal Astronomical Society, Volume 428, Issue 4

    {bf Ehlert, S.}; Allen, S. W.; von der Linden, A.; Simionescu, A.; Werner, N.; Taylor, G. B.; Gentile, G.; Ebeling, H.; Allen, M. T.; Applegate, D.; Dunn, R. J. H.; Fabian, A. C.; Kelly, P.; Million, E. T.; Morris, R. G.; Sanders, J. S.; Schmidt, R. W. ``Extreme active galactic nucleus feedback and cool-core destruction in the X-ray luminous galaxy cluster MACS J1931.8-2634'', Monthly Notices of the Royal Astronomical Society 2011, Volume 411, Issue 3

    {bf Ehlert, S.}; Ulmer, M. P. ``The radial dependence of temperature and iron abundance. Galaxy clusters from z = 0.14 to z = 0.89'', Astronomy and Astrophysics 2009, Volume 503, Issue 1

    Ulmer, M. P.; Graham, M. E.; Vaynman, S.; Echt, J.; Farber, M.; { bf Ehlert, S.}; Varlese, S. ``Progress Toward Light Weight High Angular Resolution Multilayer Coated Optics'', Experimental Astronomy 2005, Volume 20, Issue 1-3

       
     



    Journal Articles Near Completion
    These articles have either been submitted for publication or will soon be. All are in the final stages of preparation and the results in these papers are robust. You can find preprints at
    href{http://www.stanford.edu/~sehlert/cv.html}{tt http://www.stanford.edu/textasciitilde sehlert/cv.html}. 


    {bf Ehlert, S.}; Allen, S.W.; Brandt, W.N.; Xue, Y.Q.; Luo, B.; von der Linden, A.; Mantz, A.; and  Morris, R. G. ``X-ray Bright Active Galactic Nuclei in Massive Galaxy Clusters II: The fraction of galaxies hosting X-ray AGN''

    {bf Ehlert, S.}; Allen, S.W.; Brandt, W.N.; Xue, Y.Q.; Luo, B.; von der Linden, A.; Mantz, A.; and  Morris, R. G. ``X-ray Bright Active Galactic Nuclei in Massive Galaxy Clusters III:  The near-universal influence of the cluster environment''




     


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