And here comes another new paper already. This one was processed extremely quickly, even for a letter: I submitted it on the day before I left for my Europe trip, got the referee report less than two weeks later while at the MODEST14 conference, adjusted and re-submitted the paper two days later. It was accepted an hour after re-submission, I got the proofs while in Strasbourg, corrected them and a day after my visit to Vienna the Letter was already published, exactly 4 weeks after the initial submission. I didn’t even find the time to out it on the arXiv before that, so it went there this week.

So, what is the paper about? The presence of satellite galaxy planes around both the Milky Way and Andromeda makes one wonder whether the fact that these two are part of the Local Group increases the chances to find co-orbiting planes of satellite galaxies like the VPOS. This we tested using the cosmological ELVIS simulations, which contain both isolated hosts and hosts in Local-Group-like pairs. We find no significant difference in the occurrence of satellite planes around both types of hosts, in fact such planes are extremely unlikely for both if the simulated dark matter sub-halos are identified with satellite galaxies.

Co-orbiting Planes of Sub-halos are Similarly Unlikely around Paired and Isolated Hosts; Marcel S. Pawlowski & Stacy S. McGaugh; 2014, ApJL, 789, 24.

Our new paper “Co-orbiting satellite galaxy structures are still in conflict with the distribution of primordial dwarf galaxies” has been accepted a few weeks ago, and now we have finally made the preprint available here.

The reason for the delay was that we had to prepare and coordinate several press releases related to the paper. These appear today:

Case Western Reserve University (me): “Nearby satellite galaxies don’t fit standard model”

Rochester Institute of Technology (David Merritt): “Map of universe questioned; dwarf galaxies don’t fit standard model”

Swinburne University of Technology (Duncan Forbes): “Nearby satellite galaxies challenge standard model of galaxy formation”

Australian National University (Helmut Jerjen): “Milky Way debris came from galaxy collision”

University of Vienna (Gerhard Hensler): “Neues ‘Geburtsszenario’ für Satellitengalaxien” (in German)

After eight busy month in Cleveland, I’ll be traveling for four weeks in May and June:

May 26, 27 and 30: Visiting the AIfA/HISKP, Uni Bonn, Germany. Talk on Friday, May 30, in Pavel Kroupa’s SPODYR Group.

June 2 – 6: Conference “MODEST 14  The dance of stars: dense stellar systems from infant to old” in Bad Honnef, Germany. Talk on Friday, June 6.

June 10 – 13: Visiting the Observatoire de Strasboug, France, in particular Benoit Famaey. Short talk in the Galaxy Lunch seminar on Thursday, June 12.

June 15 – 18: Visiting the Institute for Astrophysics, University of Vienna, Austria. Colloquium talk on Monday, June 16.

Today my most-recent paper became available as a preprint on the arXiv: “Perseus I and the NGC 3109 association in the context of the Local Group dwarf galaxy structures“, by myself and Stacy McGaugh.

In it we investigate the alignment of the recently discovered dwarf galaxy Perseus I with the other dwarf galaxy structures in the Local Group (extending this previous paper of mine), we predict the velocity dispersion of the isolated dSph galaxies in the Local Group and study the NGC 3109 association. We also identify a new potential problem for LCDM cosmology, which we term the ‘overabundant backsplash problem’.

Read it on our SciLogs.com blog The Dark Matter Crisis: “LUX: Results from another direct (non-)detection experiment for Dark Matter“.