The old globular cluster system of the dIrr galaxy NGC 1427A in the
... were bias- and flatfield-corrected in the same manner. The sky images were cleaned from all detected sources with a SExtractor object map, and object residuals were manually replaced with nearby empty sky patches. Then, these cleaned sky images were subtracted from the associated object exposures to ...
... were bias- and flatfield-corrected in the same manner. The sky images were cleaned from all detected sources with a SExtractor object map, and object residuals were manually replaced with nearby empty sky patches. Then, these cleaned sky images were subtracted from the associated object exposures to ...
Evolution of the atomic and molecular gas content of galaxies
... carried out a similar project based on post-processing. Fu et al. (2010, 2012) modeled the partitioning of gas into Hi and H2 in radial bins in each galaxy, using both the metallicity-dependent recipes of Krumholz, McKee & Tumlinson (2009, hereafter KMT) and the pressure-based recipe of BR, and self ...
... carried out a similar project based on post-processing. Fu et al. (2010, 2012) modeled the partitioning of gas into Hi and H2 in radial bins in each galaxy, using both the metallicity-dependent recipes of Krumholz, McKee & Tumlinson (2009, hereafter KMT) and the pressure-based recipe of BR, and self ...
– 1 – 1. Emission Lines in Nearby Galaxies 1.1.
... ratio of their strengths will yields a measure of temperature. The key diagnostic lines used include 4363 Å of [OIII], but this line is often too weak to be observed. Note that these are all forbidden lines, which means they have low transition probabilities. When the 4363 Å line is too weak to be ...
... ratio of their strengths will yields a measure of temperature. The key diagnostic lines used include 4363 Å of [OIII], but this line is often too weak to be observed. Note that these are all forbidden lines, which means they have low transition probabilities. When the 4363 Å line is too weak to be ...
transcript.
... New York be able to move their fingers, like this, okay? Just two centimeters. That's the precision with which we can measure something that is 26,000 light years away from us. ...
... New York be able to move their fingers, like this, okay? Just two centimeters. That's the precision with which we can measure something that is 26,000 light years away from us. ...
Chapter 25 - Haiku Learning
... the universe extend infinitely in all directions, or does it have boundaries? This chapter will answer these questions by examining the universe and the most numerous objects in the night sky—the stars. As early as 5000 years ago, people became fascinated with the star-studded skies and began to name ...
... the universe extend infinitely in all directions, or does it have boundaries? This chapter will answer these questions by examining the universe and the most numerous objects in the night sky—the stars. As early as 5000 years ago, people became fascinated with the star-studded skies and began to name ...
Evolution of the atomic and molecular gas content of galaxies
... We study the evolution of atomic and molecular gas in galaxies in semi-analytic models of galaxy formation that include new modeling of the partitioning of cold gas in galactic discs into atomic, molecular, and ionised phases. We adopt two scenarios for the formation of molecules: one pressure-based ...
... We study the evolution of atomic and molecular gas in galaxies in semi-analytic models of galaxy formation that include new modeling of the partitioning of cold gas in galactic discs into atomic, molecular, and ionised phases. We adopt two scenarios for the formation of molecules: one pressure-based ...
Detection of the Stochastic Background of nHz Gravitational Radiation from Massive Black
... • Sagittarius A* – Black Hole with mass of 4 million Suns (Ms) in the center of our Milky Way galaxy. • NGC 4258 – mass of 30 million Ms, similar to many nearby galaxies. • Quasars and “Active” Galaxies – jets formed by poorly understood processes; masses up to a few billion Ms. 2003 Summer School, ...
... • Sagittarius A* – Black Hole with mass of 4 million Suns (Ms) in the center of our Milky Way galaxy. • NGC 4258 – mass of 30 million Ms, similar to many nearby galaxies. • Quasars and “Active” Galaxies – jets formed by poorly understood processes; masses up to a few billion Ms. 2003 Summer School, ...
25 Years of the Hubble Space Telescope - Speaker
... Beyond the solar system, Hubble has studied star formation and death in our Galaxy and nearby galaxies. As a first example, this image of the Carina Nebula was released for Hubble’s 17th anniversary. At the time (2007), it was one of the largest panoramic images ever taken with Hubble’s Advanced Ca ...
... Beyond the solar system, Hubble has studied star formation and death in our Galaxy and nearby galaxies. As a first example, this image of the Carina Nebula was released for Hubble’s 17th anniversary. At the time (2007), it was one of the largest panoramic images ever taken with Hubble’s Advanced Ca ...
XXII. Low-efficiency star formation in early-type galaxies
... the simulations, we find that the early-type galaxies are offset from the Kennicutt relation compared to the spirals, with a twice lower efficiency. Finally, we validate our approach by performing a direct comparison between models and observations. We run a simulation designed to mimic the stellar ...
... the simulations, we find that the early-type galaxies are offset from the Kennicutt relation compared to the spirals, with a twice lower efficiency. Finally, we validate our approach by performing a direct comparison between models and observations. We run a simulation designed to mimic the stellar ...
A catalogue of the Chandra Deep Field South with multi
... fraction of an object in every band as it would appear in equal seeing. To this end, we use the seeing-adaptive, weighted aperture photometry in the MPIAPHOT package (Röser & Meisenheimer 1991; Meisenheimer et al. 2004). MPIAPHOT measures the central surface brightness of objects after convolving t ...
... fraction of an object in every band as it would appear in equal seeing. To this end, we use the seeing-adaptive, weighted aperture photometry in the MPIAPHOT package (Röser & Meisenheimer 1991; Meisenheimer et al. 2004). MPIAPHOT measures the central surface brightness of objects after convolving t ...
Teaching Tips Table of Contents - Hubble Deep Field
... Activity description ........................................................................................................... 1 Grade levels / Target audience........................................................................................ 1 Subjects ....................................... ...
... Activity description ........................................................................................................... 1 Grade levels / Target audience........................................................................................ 1 Subjects ....................................... ...
Downloadable Full Text
... The elements heavier than zinc are synthesized through the (r)apid and (s)low neutroncapture processes1,2. The primary astrophysical production site of the r-process elements (such as europium) has been debated for nearly 60 years2. Chemical abundance trends of old Galactic halo stars initially sugg ...
... The elements heavier than zinc are synthesized through the (r)apid and (s)low neutroncapture processes1,2. The primary astrophysical production site of the r-process elements (such as europium) has been debated for nearly 60 years2. Chemical abundance trends of old Galactic halo stars initially sugg ...
The formation of disc galaxies in high-resolution moving
... by the numerical scheme employed for solving hydrodynamics, as emphasized recently (Kereš et al. 2012; Sijacki et al. 2012; Torrey et al. 2012; Vogelsberger et al. 2012). These studies have shown that accuracy differences between smoothed particle hydrodynamics (SPH, as implemented in the GADGET co ...
... by the numerical scheme employed for solving hydrodynamics, as emphasized recently (Kereš et al. 2012; Sijacki et al. 2012; Torrey et al. 2012; Vogelsberger et al. 2012). These studies have shown that accuracy differences between smoothed particle hydrodynamics (SPH, as implemented in the GADGET co ...
don_lamb - New Views of the Universe
... of greatest remaining mystery of GRBs: The Nature of short GRBs Follow-up observations at X-ray, optical, and radio wavelengths have led to compelling evidence that short GRBs come from merging compact binaries (as David Eichler, Mario Livio, Tsvi Piran, and David Schramm conjectured in 1989) It ...
... of greatest remaining mystery of GRBs: The Nature of short GRBs Follow-up observations at X-ray, optical, and radio wavelengths have led to compelling evidence that short GRBs come from merging compact binaries (as David Eichler, Mario Livio, Tsvi Piran, and David Schramm conjectured in 1989) It ...
Confirmation of Hostless Type Ia Supernovae Using Hubble Space
... above results are based on αd = −1.0, which is true for field galaxies (Blanton et al. 2003), but αd may be higher in rich galaxy clusters (e.g., Milne et al. 2007). Adopting αd = −1.5 as an upper limit, the MENeaCS survey estimated that . 2% of the stellar mass in dwarf cluster galaxies below dete ...
... above results are based on αd = −1.0, which is true for field galaxies (Blanton et al. 2003), but αd may be higher in rich galaxy clusters (e.g., Milne et al. 2007). Adopting αd = −1.5 as an upper limit, the MENeaCS survey estimated that . 2% of the stellar mass in dwarf cluster galaxies below dete ...
Diapositiva 1
... Identification of QSOs (reference frame) Basic stellar parameters for single stars as input for RVS data processing: Log(g),Teff, [Fe/H], Av Derivation of L,R, age ,m using parallaxes (and stellar models) Parametrization of special sources (galaxies…) Italian contribution: Training data Galaxy simul ...
... Identification of QSOs (reference frame) Basic stellar parameters for single stars as input for RVS data processing: Log(g),Teff, [Fe/H], Av Derivation of L,R, age ,m using parallaxes (and stellar models) Parametrization of special sources (galaxies…) Italian contribution: Training data Galaxy simul ...
Diapositiva 1
... Identification of QSOs (reference frame) Basic stellar parameters for single stars as input for RVS data processing: Log(g),Teff, [Fe/H], Av Derivation of L,R, age ,m using parallaxes (and stellar models) Parametrization of special sources (galaxies…) ...
... Identification of QSOs (reference frame) Basic stellar parameters for single stars as input for RVS data processing: Log(g),Teff, [Fe/H], Av Derivation of L,R, age ,m using parallaxes (and stellar models) Parametrization of special sources (galaxies…) ...
G060048-00 - DCC
... • Main obstacles to progress: – Source model : intrinsic LF and beaming angle distrib ...
... • Main obstacles to progress: – Source model : intrinsic LF and beaming angle distrib ...
The Formation and Evolution of the Milky Way
... How stars make “metals” is now reasonably well understood. For the most part they are formed by a chain of fusion of lighter elements. There are actually several astrophysical processes involved, each of which forms a different assortment of elements (Figure 4). How and when these processes take pla ...
... How stars make “metals” is now reasonably well understood. For the most part they are formed by a chain of fusion of lighter elements. There are actually several astrophysical processes involved, each of which forms a different assortment of elements (Figure 4). How and when these processes take pla ...
here - Ira-Inaf
... The far infrared emissivity of the dust in the interstellar medium of the far outer Galaxy is smaller, and the pressure of the intercloud medium is much smaller (Brand and Wouterloot, 1996). Although these factors might be expected to negatively influence the cloud- and star-formation activity in th ...
... The far infrared emissivity of the dust in the interstellar medium of the far outer Galaxy is smaller, and the pressure of the intercloud medium is much smaller (Brand and Wouterloot, 1996). Although these factors might be expected to negatively influence the cloud- and star-formation activity in th ...
Static, Infinite, Etern and Auto sustentable Universe
... doesn‟t allow a calculation for more than two particles, much less for the type of structures that we propose. Also, the classic analysis allows using for a distribution with radial distribution an average calculation for a distribution of matter, by means of the Gaussian‟s law, how we have used alr ...
... doesn‟t allow a calculation for more than two particles, much less for the type of structures that we propose. Also, the classic analysis allows using for a distribution with radial distribution an average calculation for a distribution of matter, by means of the Gaussian‟s law, how we have used alr ...
Beyond the Big Bang - Physics Department, Princeton University
... on a dime if you hold the coin out at arm’s length. The patch appears blank to the human eye and to ground-based telescopes because it contains no stars or galaxies bright enough to be seen. But by adding up the light collected over ten days, the Hubble Space Telescope was able to gradually build a ...
... on a dime if you hold the coin out at arm’s length. The patch appears blank to the human eye and to ground-based telescopes because it contains no stars or galaxies bright enough to be seen. But by adding up the light collected over ten days, the Hubble Space Telescope was able to gradually build a ...
powerpoint - High Energy Physics at Wayne State
... The Milky Way Sun is ~ 30000 LY from the center of our Galaxy. From our location within the galaxy, we cannot see through its far rim because the space between stars is not empty – interstellar dust or gas which absorbs visible light. The interstellar gas is the fuel for the formation of stars. Yet ...
... The Milky Way Sun is ~ 30000 LY from the center of our Galaxy. From our location within the galaxy, we cannot see through its far rim because the space between stars is not empty – interstellar dust or gas which absorbs visible light. The interstellar gas is the fuel for the formation of stars. Yet ...
Lecture Topics 1023
... ASTR 1023 Lecture Topics These are the headings of the paragraphs into which ASTR 1023 lectures are divided. Use them to check your notes for completeness, and to see how the course is organized. It is also a good idea to cross-check these topics with your reading assignments, because some topics ar ...
... ASTR 1023 Lecture Topics These are the headings of the paragraphs into which ASTR 1023 lectures are divided. Use them to check your notes for completeness, and to see how the course is organized. It is also a good idea to cross-check these topics with your reading assignments, because some topics ar ...
Galaxy Zoo
Galaxy Zoo is a crowdsourced astronomy project which invites people to assist in the morphological classification of large numbers of galaxies. (e.g.) It is an example of citizen science as it enlists the help of members of the public to help in scientific research. There have been seven versions up to July 2014, which are outlined in this article. Galaxy Zoo is part of the Zooniverse, a group of citizen science projects.