Each month
we will highlight a member of the CANDELS team by presenting an
interview introducing them and what it's like to be an astronomer. This
month's Astronomer is Timothy Dolch.
My name is Tim
Dolch, and I’m a postdoctoral research associate, or postdoc, at Oberlin College in Oberlin, OH. (“Postdoc”
refers to the phase in a research career between graduate school and a
permanent position, during which a professor or full scientist hires a recently
graduated Ph.D. While postdoctoral appointments are typically only funded for
two years - and astronomers often do at least two separate postdoc jobs - the
benefit is that you can devote most of your time to research. Finding a
permanent position is, obviously, nice and permanent, but the downside is that
a lot more of one’s time goes into grant writing and other administrative
matters.) Born and raised in the vicinity of Cleveland, OH, I attended the California Institute of Technology in Pasadena, CA where I majored in physics, although taking as many
astrophysics classes as possible. I did my graduate work at Johns Hopkins University and the Space Telescope Science Institute in
Baltimore, MD. There I did my thesis research with Harry Ferguson, and became a
co-investigator on the CANDELS
project.
What is your specific area of research? What is your role within the CANDELS team?
For my postdoctoral
research I’m working with the NANOGrav collaboration detecting gravitational
waves with pulsars. Within the CANDELS group my research was, and continues to
be, on the extragalactic background light or EBL. (See my July blog entry for a
more detailed explanation.) During the 20% of time I have as a postdoc to work
on personal research outside of the NANOGrav collaboration, I have been leading
the EBL group’s telecons and working on several papers that, together, will be
a sequel to my Ph.D. thesis.
What made you want to become an astronomer? At what age did you know you were interested in astronomy?
My family went
to science museums and astronomy club events frequently when I was growing up,
and so I don’t really remember a time I wasn’t interested in astronomy. I have
always been an avid science fiction fan, which led me to read a book called
“Asimov on Physics” when I was fourteen years old. It’s a beautiful little book
that traces the history of physics starting with, I think, Archimedes, and
ending with the Uncertainty Principle. After that I was sure I wanted to work
in some area of physics, and naturally this led me to astrophysics.
What obstacles have you encountered on your path to becoming an astronomer and how did you overcome them?
During
graduate school I realized experientially how important the writing process is
to being a scientist. While I had known this fact theoretically, I was
surprised how much time it was taking me. Eventually I took the advice of
friends and colleagues and started writing for three hours every morning (even
if I didn’t know exactly what I was going to say), and then made a lot of
progress. I discovered that one shouldn’t simply think up ideas first and write
about them later – writing itself is part of the scientific thought process.
It’s not as though you have an insight about nature one day and then the next
day have to pay the price of writing about it. The encounter with nature can
happen the moment you touch your fingers to the keyboard.
Who has been your biggest scientific role model and why?
Although he
was primarily a mathematician, Jacob Bronowski has become one of my heroes
because he is filled with wonder at the very fact that science works at all. I read his book
“Science, Magic, and Civilization” during graduate school and suddenly found
myself not taking the profound nature of scientific reasoning for granted. I
remember being taught in elementary school that the scientific method consists
of forming a hypothesis, doing an experiment to test it, and then modifying the
hypothesis according to the results. While this is not false, it’s grossly
incomplete. We go through that process in our heads all the time with or
without science. Cavemen went though that thought process. What is the insight
that occurred during the scientific revolution? According to Bronowski, it was
the conviction derived from Platonic thought that nature operates
linguistically. The language nature speaks is the same mathematical language we
know. The book helped me to see that this strange correspondence between
ourselves and the universe (strange because we can understand it at all!) is a
reason to always expect surprises from nature.
What is it like to be an astronomer? What is your favorite aspect?
It’s a lot of
work and personal sacrifice – for example, you have to be willing to move
anywhere in the country, if not the world, at multiple junctions of your
career, especially during the postdoctoral phase. But the reward is all the
beauty you get to see which you wouldn’t otherwise know about. My favorite
aspect is the way that, as time progresses, I’m more and more amazed by subtle,
more hidden phenomena that I wouldn’t have known about as a general reader. Recently
I learned that millisecond pulsars which have a double-peaked pulse are that
way not because they are double pulsars, but often because they are single
pulsars rotating at speeds approaching that of light – and thus their apparent
pulse profile undergoes a relativistic transformation.
What motivates you in your research?
I wait expectantly
for those moments when something in nature becomes, as it were, unveiled. This
happened most strikingly for me when I was looking at a plot, and saw that one
of my background predictions lined up unexpectedly with a published measurement.
What is your favorite astronomical facility? (This could include telescopes or super computers, for example)
For me it’s a
tie between the Hubble Space Telescope (HST) and the Arecibo Observatory in
Arecibo, Puerto Rico. HST needs no further justification after one sees the
Ultra Deep Field for the first time. Arecibo (featured in the movies Contact
and Goldeneye) is the observatory with which I have a lot of tangible experience
– it’s breathtaking to enter the coordinates of a pulsar in the control room
and see the Gregorian dome 450 feet above you move and track the source.
Where do you see yourself in the future? What are your career aspirations?
I would like
to continue doing research and be heavily involved with teaching and outreach
as well.
If you could have any astronomy related wish, what would it be?
The Green Bank Telescope in West Virginia in under threat of closure. This would be a tragedy
for radio astronomy, especially as far as gravitational wave detection is
concerned. So I would like to see that saved. I would also like to see an
EBL-specialized camera mounted on a spacecraft flying to the outer solar
system. That way the extragalactic (or at least, extrasolar) background light
could be observed without obscuration from all the dust in the zodiacal cloud.
There are proposals in the works along these lines.
What is your favorite, most mind-boggling astronomy fact?
Interstellar
dust grains migrate into the solar system and occasionally enter our
atmosphere. About 22 tons worth of interstellar dust reside in our atmosphere
at any given time.
I did theater in high school, and
recommend the experience for astronomers or any scientists who are starting
their careers. It can help you with speaking to an audience later on, which is
something you’ll eventually do frequently.
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