The H0LiCOW collaboration just released news that they’ve measured what KIPAC and H0LiCOW collaboration member Phil Marshall calls “a key property of the universe”: the Hubble constant, which tells how fast the universe is expanding. According to their measurements, our universe is currently expanding at 71.9 km/s/Mpc, within about 3.8% accuracy, which means that each second, our universe is adding very close to 71.9 kilometers of space per megaparsec in every direction. This expansion is increasing, a phenomenon attributed (for now, at least) to the influence of a new component of the universe, dark energy.
The acronym ΛCDM (Lambda-cold dark matter) is shorthand for our current best cosmological model describing the early beginnings, evolution until now, and future development of our entire Universe. It posits a cosmos dominated by a cosmological constant (denoted by Λ, the Greek letter capital lambda) our best guess for the phenomenon of dark energy, and a type of slow-moving, non-interactive matter called cold dark matter that outweighs the ordinary matter making up stars and planets—and us—by more than five to one. ΛCDM does well enough explaining the majority of our astrophysical observations that it is the standard paradigm for most people working in the field.
Some things just go together. Hot dogs and mustard, smart phones and selfies, school and summer vacation. But science is a year-round proposition, and several undergrads didn't seem to mind forgoing their summer vacations to pursue a variety of research opportunities with members of KIPAC. (Protip: it’s never too soon to start thinking about next summer!)
By modeling the warped images of a gravitational lens observed with one of the most powerful telescopes in the world, KIPAC scientists have made the dramatic discovery that there is a clump of dark matter with no currently visible normal-matter counterpart in a far-away galaxy. Such unaccompanied clumps are incredibly difficult to detect and only a small handful of them have ever been discovered, but a concerted effort to find them and determine how and why they form could pay off significantly in the long term by giving us new insights as to the nature of dark matter.
The first direct detection in 2015 of a gravitational wave event (GW) by the recently upgraded Laser Interferometer Gravitational-Wave Observatory, known as Advanced LIGO, ushered in with a mighty bang a completely new era in astronomy. The first science run with the Advanced LIGO detector started in September 2015, and two high-significance events (GW150914 and GW151226) and one sub-threshold event (LVT151012) were reported. These three events were compatible with signals expected from the mergers of two black holes.
The Crab Nebula, our old friend, has continued giving us big surprises in the past few years, as we recently saw in this KIPAC blogpost (from April 2015, by Jeff Scargle and Roger Blandford). We have been gaining glimpses into these surprises thanks to the excellent performance of the orbiting gamma-ray telescopes, Fermi and AGILE, which have been able to get glimpses into the hidden secrets kept mum for so long in other wavelengths by this old stalwart.
Jul 10, 2016 | Ripples in spacetime - from 1.3 billion light years away
By now most of you who are “astro-enthusiasts” have already heard the news originally announced in February 2016 of the gravitational wave event observed by Advanced LIGO in September 2015, and perhaps also heard a bit about how excited astrophysicists were about it. As for why we were all so enthused, maybe the simplest explanation is this: we have grown a new sense and have for the first time heard the ripples in spacetime emanating from two colliding black holes, spreading out throughout the Universe, and gently jiggling the Earth as they pass us by, in a way humans have never been able to before.
Jul 2, 2016 | Swift GRBs: a 3D step toward standard candles
Gamma-ray bursts (GRBs) are some of the most energetic events known in astrophysics. In just a few seconds, a typical burst can release as much energy as our sun will emit over its entire 10 billion-year lifetime so it is not surprising that GRBs have been detected billions of light years away. If the intrinsic brightness of GRBs were known, a comparison with their detected brightness would yield their effective distance, and given their observed recession velocity or redshift, GRBs could then be used as accurate distance estimators for cosmology. This would enable researchers to arrive at solid estimates for the distances of all manner of extremely faint, old objects, such as very early galaxies.
Last fall, KIPAC professor Bruce Macintosh managed to make time in his busy schedule of teaching and sleuthing for extrasolar planets orbiting around distant stars to help put together a progress report for a mid-decadal review of what is arguably the most important exercise in his entire field: The Astronomy and Astrophysics Decadal Survey. For the past 60 years, once each decade the astronomy and astrophysics community in the US takes a good, long look in the mirror. During this comprehensive self-assessment, scientists from across the country and around the world come together to hash out issues of scientific priorities and resource allocations, enabling the field as a whole to face the future together. "This is a good thing," Macintosh says—the democratic process results in a community that is more supportive of the resulting priorities
The Dark Energy Camera (DECam) is a 570-megapixel camera installed on the 4-meter Victor Blanco telescope atop Cerro Tololo, a mountain in the Chilean Andes. The science mission for the Dark Energy Survey, of which I’m a member, is nothing less than to use this camera to understand what Dark Energy is. Which is a tall challenge, since the phrase “Dark Energy” itself is, as some cosmologists say, simply words we use to describe our profound ignorance about the current-day accelerating expansion of the universe.
By Lori Ann White
In the series, "Where are they now?" we check in with KIPAC alumni: where they are now, how they've fared since their days exploring particle astrophysics and cosmology at the Institute, and how their KIPAC experiences have shaped their journeys.
Apr 18, 2016 | First Baby Photos of an Infant Planet
For the first time we've managed to take a baby picture of a planet still in the process of growing. Our team was able to image this so-called “proto"-planet with the Magellan telescope in Chile, taking advantage of the high-speed adaptive optics of the telescope to correct for blurring by the Earth's atmosphere. This allowed us to take a super high-resolution image of the system and, after subtracting the light from the central star, isolate light coming directly from the protoplanet. More specifically, we isolated light emitted by ultra-hot hydrogen gas falling onto the protoplanet, which is named (systematically, if not super-creatively) LkCa 15 b after its star, LkCa 15 A.