Monday, July 7, 2014

Fair use of Hubble Images

Hubble images, especially those pretty ones made available through the Hubble Heritage (link), are free to use by everyone. Sometimes by some kind-of-fringy people or plain astrologers. I have seen some professional astronomers lose their cool as their image got sued for a Astrology ad for example.

My attitude is: "Hey, the public paid for these images and everyone in that public gets to use them. Any and all of them. That's fair use."

So imagine my surprise when I got an email regarding my occulting galaxy image (the wallpaper of this blog etc etc) by an author of an alternative galaxy evolution model.

Here is the excerpt he sent me that talked about the overlapping pair:

Case Study of 2MASX J00482185-2507365.    You are on your own, Lil’ Doggy.
In the next illustration the secondarily formed nucleus is considerably smaller than the primary body.  A case of mitosis?  If it is, then a fragment or the tail end of a bar nucleus was dislocated and forcefully and speedily flung for some distance from the galaxy’s center.  It lodged there above the ‘mother’ galaxy, where it has begun to construct its own galaxy of stars.  So small, but it seems to have retained a preference for the bar shape. [Any suggested names for this ‘newbie’ galaxy?]  
 Birth book cover image Image of 2MASX J00482185-2507365. Credit  NASA, ESA, and The Hubble Heritage Team STScI, AURA, B. Holwerda, Space Telescope Science Institute, J. Dalcanton U. of Washington
            Before reaching its present location this ‘offspring’ galaxy was a clump of heavy black holes. Perhaps less than 10% of the original nucleus, it still weighed as much as several hundred thousand Suns, perhaps millions.  As it soared through the inner most galaxy and partially through the spiral rings it caused some minor alteration of the star orbits in those areas, which is apparent in the image, minor effects because of its great speed.  Run-away stars and black holes have been well documented.  These are the losers of a gravity contest between two or more big boss bodies.  So, this junior galaxy quickly got to where it wanted to be, then slowed enough to start its own family of stars.  Again, runaways are slowed by the capture of dark matter and increasing weight.  Its present site is ideal for capturing inflowing dark matter.  (Dark matter is instrumental in star formation.)
[Someone want to calculate how long it took to reach the present location?] 
(It is asserted here that the Milky Way nucleus is preparing for a similar event.  See The Case of the Twisted Ring at the Center of the Milky Way, July 20, 2011.)
[Reminder:  Scientists state that no such action is possible because the nucleus is just one oversized black hole that never breaks up or decomposes.  (Except for some vague exceptions.)]

One of the characteristics that distinguish Mitosis from the more common merger of galaxies is the absence of gravitational or pressure waves.  The two entities do not interfere with each other.  Reasons given elsewhere.  

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I will not even pretend I understand the logic but I am flattered that someone got inspired by the picture I helped create (props really go to JD and the Hubble Heritage team) and I appreciate being told about its use. 



Tuesday, June 24, 2014

HST Cycle-22 Results

So after battling insomnia thanks to the Giant Unspecified Anxiety that I am apparently sensitive to from time to time, I got the results for the Cycle 22 HST proposals early. I had put in three as PI and was invited to a bunch more. The results were in. Two successful ones as PI and two as co-I. A bumper crop year!

The halo of M101 is going to be studied in detail with WFC3 adn ACS with the GHOSTS team and 150 occulting galaxy pairs are going to be the target for a SNAP project. V. cool. Especially the last one is a personal validation after several years in second quartile.

The other two (co-I) are z=9-10 galaxy surveys. One over the CANDELS field and one using the BoRG strategy. Very complementary. v. cool. And fits nice with my latest paper on z=9-10 galaxy sizes and my ongoing project to identify cool Milky Way.

So much SCIENCE!

Definitely a win. Bring me all the bagels and muffins in the land.

Friday, June 6, 2014

The kids playhouse lessons of project management

I have spent a few days spread over thelast months trying to build a swanky play house for the kids. The house itself has been met with approval by its customers, indicating i did a decent enough job.

Coupleof things that happened while building:

- small injury. Handeling wood and tools make scrapes etc inevitable.
- delay due to weather.
- goingback to the hardware store for that thing that I forgot.
- a thing that took longer.
- something that the instructional video made look trivial but wasn’t.
- back to the store for two more planks.
- it took longer.
- late stage suggestions for improvements.

Doesn’t this all sound familiar? With theexception of the more trips to the hardware store than originally anticipated, pretty much all of these are artifacts of astronomy projects. Such things pop up with every project. I have done two projects with woodworking around the house and immediately i can tell you there is a HUGE difference in the documentation. Vague instructions demand lots of improvisation and take much longer (playhoise) and detailed cut list makes it go very quick and smooth (work bench).
additional trips are inevitable but with a clear plan can be cut down significantly.

Small injury amd delay are inevitable. Weather will happen.

But it feels like we have to delude ourselves some every time in order to get started. If the first thought for a project would be “definitely going to need some bandaids during this”, we’d never get started. Same in astronomy I wager.

Monday, June 2, 2014

Is there a part-time phd?

In Europe there are no or hardly any part-time PhDs in astronomy. There used to people that would be on the dole until they finished the PhD. Strickter funding and other rules put mostly an end to that.

Of course there is a PhD comic on the topic.

Not so in the USA where not only do the students pay for the classes but it strongly depends on year-to-year funding. So many people do a phd on the side. Next to a full time job.

So how to set that up? The research part of a phd is a lot harder to do part time. It’s deep work. Hard to get back into after distractions. The kind you do while concentrating on a topic for a long time.
I may now have one or two people who will do a phd with me over many years. Does anyone have experience with the part time PhD student? And how to help them over the finish line?

No idea yet.

Students! Here for SCIENCE! And summer.

This year I am the LEAPS program coordinator together with the ruthlessly organized Catherine Walsh. We work well together. Logistically "interesting" problem, getting everyone from everywhere to Leiden and housed and set up etc. I am the local-Dutch-speaker-in-charge-of-yelling-at-people.
Most have arrived now and are getting started (getting bikes for example). Some final details regarding the four outings to be sorted out.

Funny how exhausting and time-consuming this program is. Fun too.

Excuse me while I call a man about a missing toilet seat. Ah science.

Wednesday, May 28, 2014

A null-result

A little while back, I asked for SINFONI data on a suspected high-redshift QSO. If we were lucky, we would get the Lyman Alpha emission (and maybe a few other emission lines) redshift right into the J-band. ESO awarded 3 hours of observing time.

That left me with SINFONI data and I don't know how to reduce it and since no more is likely forthcoming (I have no other program doing this) I was wondering if someone else could help. Enter Tiffany and Marissa. Marissa is a SINFONI expert and Tiffany wanted to learn how to run her pipeline. So they got to work. The result was a perfectly clean data-cube.

I extracted the spectrum where I hoped the QSO (of T-dwarf that's cool too) would be.

Here's the result:
A more experienced spectroscopist will recognize this as just sky lines all over...

ho hum.

BUt not to worry! There was a secondary target we could extract. A z~2 galaxy for which some kinematics could be determined. That would be neat too.

Below is where SINFONI ended up pointing. See the blob just outside the FOV. Yeah that's the z~2 galaxy. 
 

Sorry ESO. This run was a complete bust.

Do I now write this up and post it on astro-ph? What does one do if there is no result to report? Astronomy does not deal well with null result. They don't get reported.