NASA's Chandra Finds Milky Way's Black Hole May be Grazing on Asteroids

Feb
08

Sagittarius A*

This image from NASA's Chandra X-ray Observatory shows the center of our Galaxy, with a supermassive black hole known as Sagittarius A* (Sgr A* for short) in the center. Using intermittent observations over several years, Chandra has detected X-ray flares about once a day from Sgr A*. The flares have also been seen in infrared data from ESO's Very Large Telescope in Chile.

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Remembering Columbia

Feb
01

Nine years ago today, we experienced a terrible tragedy. On February 1, 2003, the seven-member crew of STS-107 was lost when the Space Shuttle Columbia disintegrated over Texas and Louisiana on its re-entry into Earth's atmosphere.

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Remnant of an Explosion With a Powerful Kick?

Feb
01

G350.1-0.3

Vital clues about the devastating ends to the lives of massive stars can be found by studying the aftermath of their explosions. In its more than twelve years of science operations, NASA's Chandra X-ray Observatory has studied many of these supernova remnants sprinkled across the Galaxy.

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Maneuvering Chandra in the Solar Storm

Jan
26

By now you may have seen the headlines:

"Strongest Solar Storm Since 2005 Striking Earth."
"Raging Solar Storm Triggers Northern Lights"
"Solar Storm Is Taste of Things to Come."

Hopefully, for some of you it was a nice view of the northern lights. For us, it was a busy start to the week. This started last Thursday (Jan. 19, 2012) with an M2 solar flare. Flares below M5 usually don't worry us too much, but this one was unusually long - about 6 hours - which indicated a lot of material was involved and coronal mass ejection (CME) was heading our way with a scheduled arrival of Saturday or Sunday. Sure enough on Saturday (Jan. 21), the ACE satellite, the GOES satellites and our on-board monitors started to notice a minor jump in the background particles. The rate got even higher by Sunday. By Sunday night, we had received about half our orbital budget.

When this happened our alerts system went off and we had a phone meeting. This was around half time of the NFC Champion ship game, not that I knew, since I was with my daughters at a Girl Scout camp reunion. So while they were cooking s'mores in the snow, I was on my cell phone. We know that periodically long slow radiation storms will happen and we "budget" for 10 a year. This is the first storm like this in several years. So when we "met", we reviewed how much time was left in the orbit (5 hours) and what additional fraction of out budget we would receive in the next 5 hours assuming either constant or worst-case. Since it was only 5 hours until the end of the orbit, we figured the 50% of the budget might get to 55% so we decided to ride it out, go behind the Earth and start fresh on the next orbit. Little did we know, we'd never get there.

Northern lights
Northern lights dance over the Lyngan Alps in a picture taken Tuesday night near Tromsø, Norway.Photograph by Ole C. Salomonsen, arcticlightphoto.no.
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Supernovas on Ice

Jan
25

Sometimes it's hard to get the connection between what happens far away in space and things that you can touch and feel on the ground. Of course, the science of "out there" is intertwined with the science of "right here." A new module for teachers in our Chandra Education section demonstrates that perfectly.

Gisela Dreschhoff
Dr. Gisela Dreschhoff

Since the 1970s, Dr. Gisela Dreschhoff has traveled to Antarctica and Greenland to study the effects from space imprinted on deep ice cores extracted from the ground. While she was initially interested in historic energetic events from the Sun, she has also looked at her data to see if some of the most famous supernova explosions – including Kepler, Tycho, and Cassiopeia A – have also left their mark in the ice.

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Q and A of the Day: What is electromagnetic radiation?

Jan
20

Q: What are the different types of electromagnetic radiation and what are they used for?

Electromagnetic Radiation

A: There are many kind of electromagnetic radiation (EMR) and they are distinguished by their wavelengths if you consider EMR as waves.

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NASA's Chandra Finds Largest Galaxy Cluster in Early Universe

Jan
10

El Gordo

A composite image shows El Gordo in X-ray light from NASA's Chandra X-ray Observatory in blue, along with optical data from the European Southern Observatory's Very Large Telescope (VLT) in red, green, and blue, and infrared emission from the NASA's Spitzer Space Telescope in red and orange.

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Astronomy Show Down in Texas

Jan
09
AAS Texas

This 219th meeting of the American Astronomical Society meeting is under way this week in Austin, TX. There will be lots of scientific talks, posters, and in-the-hallway discussions between the 2,700 astronomers who have come to Texas for the meeting. (That's quite a bit when you consider there are probably only several thousand professional astronomers in the whole US!)

Of course, there are lots of Chandra results being shared. Tomorrow, there will be a press conference to announce some exciting new findings involving Chandra and some of the largest objects in the Universe. We'll have the news posted on our website at 10am Central so check back for the latest in the X-ray Universe.

-Megan Watzke, CXC

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Women in the High-Energy Universe: Pepi Fabbiano

Jan
09

Dr. Giuseppina (Pepi) Fabbiano is a senior astrophysicist at the Smithsonian Astrophysical Observatory where she studies, among other things, galaxies, black holes and the rest of the high-energy Universe using Chandra and other telescopes.

It would be fair to say that I stumbled into astronomy. I grew up in a family of teachers, professors and professionals, both men and women, and there never was any doubt that I had to go to university and then get a good job. I was a precocious learner and always ‘first of the class.’ I won the math prize in high school and was one of a busload of high school students from the whole of Italy rewarded with a prize visit to France.

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Changing of the Guard at NASA Science

Jan
04

Today, a new leader reports to NASA HQ to take over what is known as the Science Mission Directorate, or SMD. SMD is the branch of the agency that is responsible for all things science at NASA - from heliophysics to Earth science to planetary science and astrophysics. Chandra, as well as the other "Great Observatories" missions of Hubble and Spitzer, and many, many missions belong to the astrophysics realm of SMD.

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