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In the News

Featured in Discover
"Habitable Planets May Be Rife With Building Blocks of Life" December 1, 2008
The new research will be published in Astrophysical Journal Letters and will boost the search for more complex molecules outside the center of the galaxy. “The search for prebiotic molecules in star-forming regions is still in the fledgling stages but the door is open now,” says co-author Roberto Neri. “I believe that many more of these molecules will show up in the near future,” he adds [BBC News].

Featured in Wired News
"Key Molecule for Life Found in Habitable Region of the Galaxy" November 26, 2008
The finding, made with the IRAM radio telescope in France, was announced Tuesday and will be published in the Astrophysical Journal Letters.

Featured in BBC News
"Milky Way's sweetness throughout" November 25, 2008
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The study, in Astrophysical Journal Letters, is important as it shows organic molecules in a region of space where planets could form.

Featured in MSNBC.com
"A galaxy far, farther away" November 20, 2008
A New Hubble Space Telescope Distance to NGC 1569: Starburst Properties and IC 342 Group Membership
Aaron J. Grocholski, Alessandra Aloisi, Roeland P. van der Marel, Jennifer Mack, Francesca Annibali, Luca Angeretti, Laura Greggio, Enrico V. Held, Donatella Romano, Marco Sirianni, and Monica Tosi

The astronomers' observations were made in 1999 using Hubble's Wide Field and Planetary Camera 2, and in 2006 and 2007 with the Advanced Camera for Surveys. Results were published in the Oct. 20 issue of the Astrophysical Journal Letters. In addition to Aloisi and Grocholski, the co-authors included Marco Sirianni of ESA and the Space Telescope Science Institute, or STScI; Jennifer Mack and Roeland van der Marel of STScI; Luca Angeretti, Donatella Romano and Monica Tosi of Italy's Astronomical Observatory of Bologna; and Francesca Annibali, Laura Greggio and Enrico Held of the Astronomical Observatory of Padua.

Featured in Scientific American
"Baby Boom Galaxy Churning Out Stars" July 17, 2008
Spectroscopic Confirmation of an Extreme Starburst at Redshift 4.547
Peter Capak, C. L. Carilli, N. Lee, T. Aldcroft, H. Aussel, E. Schinnerer, G. W. Wilson, M. S. Yun, A. Blain, M. Giavalisco, O. Ilbert, J. Kartaltepe, K.-S. Lee, H. McCracken, B. Mobasher, M. Salvato, S. Sasaki, K. S. Scott, K. Sheth, Y. Shioya, D. Thompson, M. Elvis, D. B. Sanders, N. Z. Scoville, Y. Tanaguchi
"Our Milky Way galaxy produces only about 10 new stars annually. But a galaxy far, far away is experiencing a major baby boom. It’s pumping out up to 4,000 new stars a year, and should become a massive elliptical galaxy. The discovery was announced in the July 10th issue of Astrophysical Journal Letters." 

Featured in ScienceNOW
""Baby Boom" in a Stellar Nursery" July 11, 2008
Spectroscopic Confirmation of an Extreme Starburst at Redshift 4.547
Peter Capak, C. L. Carilli, N. Lee, T. Aldcroft, H. Aussel, E. Schinnerer, G. W. Wilson, M. S. Yun, A. Blain, M. Giavalisco, O. Ilbert, J. Kartaltepe, K.-S. Lee, H. McCracken, B. Mobasher, M. Salvato, S. Sasaki, K. S. Scott, K. Sheth, Y. Shioya, D. Thompson, M. Elvis, D. B. Sanders, N. Z. Scoville, Y. Tanaguchi
"The galaxy, which they've nicknamed "Baby Boom," was producing at least 4000 new stars per year, about 400 times more than the Milky Way is now. The data also indicate how this happened: As "Baby Boom" collected nearby star clusters, they slammed into each other with such force that they created a bonanza of new stars. So the galaxy's massive haul comes not just from the stars it collected but from all the new stars that resulted from the collection process, the team reported yesterday in Astrophysical Journal Letters."

Featured in Popular Science
"A Star Is Born. Well, a Lot of Stars" July 11, 2008
Spectroscopic Confirmation of an Extreme Starburst at Redshift 4.547
Peter Capak, C. L. Carilli, N. Lee, T. Aldcroft, H. Aussel, E. Schinnerer, G. W. Wilson, M. S. Yun, A. Blain, M. Giavalisco, O. Ilbert, J. Kartaltepe, K.-S. Lee, H. McCracken, B. Mobasher, M. Salvato, S. Sasaki, K. S. Scott, K. Sheth, Y. Shioya, D. Thompson, M. Elvis, D. B. Sanders, N. Z. Scoville, Y. Tanaguchi
"Considering the birth rate, astronomers might have named this the Rabbit Galaxy. According to a new paper in today’s issue of Astrophysical Journal Letters, researchers have discovered a galaxy that birthed stars 400 times faster than our Milky Way, overturning previously held ideas about the formation of giant galaxies"

Featured in MSNBC
"The sights and sounds of space" June 27, 2008
Discovery of the Dust-Enshrouded Progenitor of SN 2008S with Spitzer
José L. Prieto, Matthew D. Kistler, Todd A. Thompson, Hasan Yüksel, Christopher S. Kochanek, Krzysztof Z. Stanek, John F. Beacom, Paul Martini, Anna Pasquali, Jill Bechtold
"This week, the scientists behind NASA's Spitzer Space Telescope put out a new view of the Fireworks Galaxy, a dazzling spiral about 17 million light-years away in the constellation Cepheus.  The Fireworks Galaxy isn't being featured just because it's getting close to the Fourth of July: Astronomers took a close look at the scene to figure out whether a supernova first spotted earlier this year was really a supernova after all. Their conclusion, slated for publication in the July 1 issue of the Astrophysical Journal Letters, was that the outburst may have been a new type of explosion for dusty, massive stars."

Featured in Fox News
"Astronomers: Earth-Like Planets May Be Very Common" February 18, 2008
Evolution of Mid-Infrared Excess around Sun-like Stars: Constraints on Models of Terrestrial Planet Formation
M. R. Meyer, J. M. Carpenter, E. E. Mamajek, L. A. Hillenbrand, D. Hollenbach, A. Moro-Martin, J. S. Kim, M. D. Silverstone, J. Najita, D. C. Hines, I. Pascucci, J. R. Stauffer, J. Bouwman, and D. E. Backman
The best guess scientists have for the time scale of the formation of Earth, as a result of collisions, is when our sun was between 10 million to 50 million years old (it is now about 4.6 billion years old). Meyer found the warm dust trails in stars between 3 million and 300 million years old. The results are detailed in the Feb. 1, 2008, issue of Astrophysical Journal Letters.

2002 September 1

Volume 576, Number 1
The Astrophysical Journal Letters, 576:L45–L48, 2002 September 1
DOI: 10.1086/343104

On the Ejection Mechanism of Bullets in SS 433

Sandip K. Chakrabarti,1,2

P. Goldoni,3

Paul J. Wiita,4

A. Nandi,1 and

S. Das1

ABSTRACT

We discuss plausible mechanisms to produce bulletlike ejecta from the precessing disk in the SS 433 system. We show that nonsteady shocks in the sub-Keplerian accretion flow can provide the basic timescale of the ejection interval while the magnetic rubber-band effect of the toroidal flux tubes in this disk can yield flaring events.

Received 2002 July 4; accepted 2002 July 24; published 2002 August 2

Subject headings:

accretion, accretion disks—hydrodynamics—instabilities—shock waves—stars: individual (SS 433)—stars: mass loss

Cited by

J. C. A. Miller-Jones, S. Migliari, R. P. Fender, T. W. J. Thompson, M. van der Klis, and M. Méndez. (2008) Coupled Radio and X-Ray Emission and Evidence for Discrete Ejecta in the Jets of SS 433. The Astrophysical Journal 682:2, 1141-1151
Online publication date: 1-Aug-2008.
Sandip K. Chakrabarti, B. G. Anandarao, S. Pal, Soumen Mondal, A. Nandi, A. Bhattacharyya, Samir Mandal, Ram Sagar, J. C. Pandey, A. Pati, S. K. Saha. (2005) SS 433: results of a recent multiwavelength campaign. Monthly Notices of the Royal Astronomical Society 362:3, 957-965
Online publication date: 1-Oct-2005.
CrossRef
A. Nandi, Sandip K. Chakrabarti, Tomaso Belloni, P. Goldoni. (2005) X-ray observation of SS 433 with RXTE. Monthly Notices of the Royal Astronomical Society 359:2, 629-636
Online publication date: 1-Jun-2005.
CrossRef
G. Lapenta and P. P. Kronberg. (2005) Simulation of Astrophysical Jets: Collimation and Expansion into Radio Lobes. The Astrophysical Journal 625:1, 37-50
Online publication date: 20-May-2005.
Zhehui Wang, X. Z. Tang. (2004) Compact toroids with Alfvnic flows. Physics of Plasmas 11:7, 3502
Online publication date: 1-Feb-2004.
CrossRef
Sandip K. Chakrabarti, S. Pal, A. Nandi, B. G. Anandarao, and Soumen Mondal. (2003) Possible Photometric Evidence of Ejection of Bullet-like Features in the Relativistic Jet Source SS 433. The Astrophysical Journal Letters 595:1, L45-L48
Online publication date: 20-Sep-2003.
Giovanni Lapenta. (2003) Solitonlike Solutions of the Grad-Shafranov Equation. Physical Review Letters 90:13,
Online publication date: 1-May-2003.
CrossRef
J. Martin Laming, Jacob Grun. (2003) Improved models for the dynamical overstability of radiative blast waves. Physics of Plasmas 10:5, 1614
Online publication date: 1-Feb-2003.
CrossRef
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