Astronomical Picture of the Day
... dust lanes usually found in a spiral. The above image taken by the Hubble Space Telescope shows details, however, that help in reconstructing the history of this gigantic jumble. Close inspection finds fewer low mass globular clusters of stars toward NGC 1316's center. Such an effect is expected in ...
... dust lanes usually found in a spiral. The above image taken by the Hubble Space Telescope shows details, however, that help in reconstructing the history of this gigantic jumble. Close inspection finds fewer low mass globular clusters of stars toward NGC 1316's center. Such an effect is expected in ...
Magnetic fields in Local Group dwarf irregulars⋆
... more luminous counterparts. Ursa Minor and Draco are examples of these systems, whose stellar velocity dispersions are only a few kilometres per second, and whose total masses of less than 106 M are composed primarily of very old stars. For our systematic search for radio emission and magnetic fiel ...
... more luminous counterparts. Ursa Minor and Draco are examples of these systems, whose stellar velocity dispersions are only a few kilometres per second, and whose total masses of less than 106 M are composed primarily of very old stars. For our systematic search for radio emission and magnetic fiel ...
The accretion disk paradigm for young stars
... emission may have some connection with this possible infall of material”, a prophetic statement that, unfortunately, no one paid attention to. In the late 1960s, another major discovery was made by Eugenio E. Mendoza V. (1966, 1968) when he found that several TTSs and related objects had strong infr ...
... emission may have some connection with this possible infall of material”, a prophetic statement that, unfortunately, no one paid attention to. In the late 1960s, another major discovery was made by Eugenio E. Mendoza V. (1966, 1968) when he found that several TTSs and related objects had strong infr ...
View/Open - University of Hertfordshire
... where Vrad is the radial velocity of a galaxy, H is the Hubble parameter and d is the distance to the galaxy. Radial velocity measurements have also been instrumental in the discovery of ‘dark matter’, first described in the German paper on the motion of extra-galactic clusters by Zwicky [1933], and ...
... where Vrad is the radial velocity of a galaxy, H is the Hubble parameter and d is the distance to the galaxy. Radial velocity measurements have also been instrumental in the discovery of ‘dark matter’, first described in the German paper on the motion of extra-galactic clusters by Zwicky [1933], and ...
Objective Classification of Galaxy Spectra using the Information Bottleneck Method
... physical and observable galaxy properties that are intuitively familiar to astronomers. For example, important properties in determining the spectral characteristics of a galaxy are its mean stellar age and metallicity, or more generally its full star formation history. This is in turn presumably co ...
... physical and observable galaxy properties that are intuitively familiar to astronomers. For example, important properties in determining the spectral characteristics of a galaxy are its mean stellar age and metallicity, or more generally its full star formation history. This is in turn presumably co ...
A fundamental metallicity relation for galaxies at z = 0.84–1.47 from
... A number of recent studies have attempted to confirm the presence of this FMR at z 1 with various high-redshift samples. For example, using a sample of highly star-forming (>20 M yr−1 ), z ∼ 1 Herschel far-infrared selected galaxies, Roseboom et al. (2012) find that their galaxies are consistent ...
... A number of recent studies have attempted to confirm the presence of this FMR at z 1 with various high-redshift samples. For example, using a sample of highly star-forming (>20 M yr−1 ), z ∼ 1 Herschel far-infrared selected galaxies, Roseboom et al. (2012) find that their galaxies are consistent ...
Cold Gas and Star Formation in Elliptical Galaxies
... than a few µm. Long wavelength emission is also detected towards a significant fraction of early-type galaxies by IRAS (12µm, 25µm, 60µm and 100µm), ISO (between about 5µm and 200 µm; Malhotra et al. 1998, S. Madden, this conference) and at submillimeter wavelengths. The largest sample available is ...
... than a few µm. Long wavelength emission is also detected towards a significant fraction of early-type galaxies by IRAS (12µm, 25µm, 60µm and 100µm), ISO (between about 5µm and 200 µm; Malhotra et al. 1998, S. Madden, this conference) and at submillimeter wavelengths. The largest sample available is ...
A STRONGLY MAGNETIZED PULSAR WITHIN THE GRASP OF THE MILKY... SUPERMASSIVE BLACK HOLE Rea ,
... Received 2013 June 21; accepted 2013 August 15; published 2013 September 11 ...
... Received 2013 June 21; accepted 2013 August 15; published 2013 September 11 ...
Title The Correlation between Dispersion Measure and X
... 2. We adopted only NH values from actual X-ray spectral fits in which the NH is allowed to vary freely, and ignored any NH inferred from DM, optical extinction (AV ), or total Galactic H i column density. 3. NH from the best-fit spectral model is always preferred, unless there are physical arguments ...
... 2. We adopted only NH values from actual X-ray spectral fits in which the NH is allowed to vary freely, and ignored any NH inferred from DM, optical extinction (AV ), or total Galactic H i column density. 3. NH from the best-fit spectral model is always preferred, unless there are physical arguments ...
Chapter 14 Black Holes as Central Engines
... appeared to be points with no obvious spatial extension, just as one would expect for stars. • These were often called “radio stars”, but they had very strange characteristics for stars. • In 1963, the first two of these radio stars were associated with the radio sources 3C48 and 3C273, respectively ...
... appeared to be points with no obvious spatial extension, just as one would expect for stars. • These were often called “radio stars”, but they had very strange characteristics for stars. • In 1963, the first two of these radio stars were associated with the radio sources 3C48 and 3C273, respectively ...
Chemical abundances and winds of massive stars in M31: a Btype
... their M31 target stars prevented strong constraints being placed on the exact shape of this extinction curve. We have briefly reinvestigated this issue using a slightly different procedure, following Fitzpatrick (1986) in using other B-type supergiants in the LMC as the comparison stars. We chose Sk ...
... their M31 target stars prevented strong constraints being placed on the exact shape of this extinction curve. We have briefly reinvestigated this issue using a slightly different procedure, following Fitzpatrick (1986) in using other B-type supergiants in the LMC as the comparison stars. We chose Sk ...
The Origin and Evolution of Dust in Galaxies
... We found dust grains in many galaxies … But still we don’t know where they are from. The orign and evolution of dust in galaxies ...
... We found dust grains in many galaxies … But still we don’t know where they are from. The orign and evolution of dust in galaxies ...
Cold versus Warm Dark Matter Simulations of a Galaxy Group
... cosmologies, as long as one considers massive galaxies with circular velocities in the range between 80 and 300 km s1 . However, for galaxies with circular velocities below 80 km s−1 , only the predictions of a 1-keV WDM particle agree with observations. On the other hand, at a circular velocity of ...
... cosmologies, as long as one considers massive galaxies with circular velocities in the range between 80 and 300 km s1 . However, for galaxies with circular velocities below 80 km s−1 , only the predictions of a 1-keV WDM particle agree with observations. On the other hand, at a circular velocity of ...
The Final Version of the White Paper is available.
... The characterization of exoplanets is one of the outstanding key science cases for HIRES. The focus will be on characterizing exo-planet atmospheres over a wide range of masses, from Neptune-like down to Earth-like including those in the habitable zones, in terms of chemical composition, stratificat ...
... The characterization of exoplanets is one of the outstanding key science cases for HIRES. The focus will be on characterizing exo-planet atmospheres over a wide range of masses, from Neptune-like down to Earth-like including those in the habitable zones, in terms of chemical composition, stratificat ...
Planet formation around stars of various masses: The snow line and
... mid-plane would include evolution of the gas surface density, allowing the mid-plane temperature to drop somewhat faster than described above as σg decreases in the inner disk (Lynden-Bell & Pringle 1974). The solid surface density, which largely resides near the mid-plane and determines protoplanet ...
... mid-plane would include evolution of the gas surface density, allowing the mid-plane temperature to drop somewhat faster than described above as σg decreases in the inner disk (Lynden-Bell & Pringle 1974). The solid surface density, which largely resides near the mid-plane and determines protoplanet ...
3. Cosmology and the Origin and Evolution of Galaxies
... spectroscopic follow-up at mm wavelengths will place very strong constraints on the evolutionary history of star formation in this important galaxy population, and challenge the currently accepted scenarios for massive-galaxy formation. ...
... spectroscopic follow-up at mm wavelengths will place very strong constraints on the evolutionary history of star formation in this important galaxy population, and challenge the currently accepted scenarios for massive-galaxy formation. ...
Calculate the Mass of the Milky Way Galaxy
... • During the uncertainties of the era, Hubble was able to observe galaxies at distances up to 7 million light years away. By doing so he was able to come up with Hubble's Law, which said that the further galaxies were away from earth the faster they moved away from our planet. Hubble's rule proved t ...
... • During the uncertainties of the era, Hubble was able to observe galaxies at distances up to 7 million light years away. By doing so he was able to come up with Hubble's Law, which said that the further galaxies were away from earth the faster they moved away from our planet. Hubble's rule proved t ...
astronomy (astr)
... ASTR 704. Cosmology. 3 Credits. General relativity and cosmological world models; thermal history of the early universe, nucleosynthesis, and the cosmic microwave background; growth of structure through cosmic time. Requisites: Co-requisite, PHYS 701. ASTR 705. Astrophysical Atmospheres. 3 Credits. ...
... ASTR 704. Cosmology. 3 Credits. General relativity and cosmological world models; thermal history of the early universe, nucleosynthesis, and the cosmic microwave background; growth of structure through cosmic time. Requisites: Co-requisite, PHYS 701. ASTR 705. Astrophysical Atmospheres. 3 Credits. ...
Munshi_washington_0250E_12611
... Simulated observation of Hα emission from SUNRSISE SED. The lineflux from this line is used to derive SFR in simulated dwarfs, normalized by continuum measurements in the simulated SED. . . . . . . . . . . . . . . Simulated observation of 24 micron emission from SUNRISE. The flux from thses images i ...
... Simulated observation of Hα emission from SUNRSISE SED. The lineflux from this line is used to derive SFR in simulated dwarfs, normalized by continuum measurements in the simulated SED. . . . . . . . . . . . . . . Simulated observation of 24 micron emission from SUNRISE. The flux from thses images i ...
MUSE three-dimensional spectroscopy and kinematics of the
... GPS radio sources have small diameters, D < 1 kpc, which might indicate (e.g. O’Dea, Baum & Stanghellini 1991) that they have become confined (trapped) within the host galaxy nucleus by a very dense (clumpy and dusty) interstellar medium, or simply that they are observed very soon after the radio ou ...
... GPS radio sources have small diameters, D < 1 kpc, which might indicate (e.g. O’Dea, Baum & Stanghellini 1991) that they have become confined (trapped) within the host galaxy nucleus by a very dense (clumpy and dusty) interstellar medium, or simply that they are observed very soon after the radio ou ...
Hot Gas In and Around Elliptical Galaxies William G. Mathews
... and in individual E galaxies are similar in many ways. But there are some important distinctions. Because smaller structures are often older in our hierarchical universe, the hot gas in elliptical galaxies and their associated galaxy groups may on average be less disturbed by ongoing mergers than th ...
... and in individual E galaxies are similar in many ways. But there are some important distinctions. Because smaller structures are often older in our hierarchical universe, the hot gas in elliptical galaxies and their associated galaxy groups may on average be less disturbed by ongoing mergers than th ...
Phase-resolved high-resolution spectrophotometry of the eclipsing
... The eclipse is two-stepped with the first step being very steep (∼3 sec) followed by a more shallow second step with ingress time of about 120 sec. All four steps have different heights. We identify the obscured sources of light with the hot accretion plasma on the white dwarf emitting cyclotron rad ...
... The eclipse is two-stepped with the first step being very steep (∼3 sec) followed by a more shallow second step with ingress time of about 120 sec. All four steps have different heights. We identify the obscured sources of light with the hot accretion plasma on the white dwarf emitting cyclotron rad ...
Curtis/Shapley Debate – 1920 - Tufts Institute of Cosmology
... In 1920 Heber D. Curtis was a bit older, more established, and very well respected in his own right. He had published a series of solid papers on good astronomical results - many times on the properties of spiral nebulae. He was a `rock of clear thinking' to all that knew him. He was a hard worker u ...
... In 1920 Heber D. Curtis was a bit older, more established, and very well respected in his own right. He had published a series of solid papers on good astronomical results - many times on the properties of spiral nebulae. He was a `rock of clear thinking' to all that knew him. He was a hard worker u ...
THE GREAT AGN DEBATE `AGN VS STARBURST
... 5. Radio-quiet quasars/ and QSO (Quasi Stellar Object) are more luminous versions of Seyfert Type 1 galaxy. They show strong optical continuum emission, Xray continuum emission, and broad and narrow optical emission lines. Some astronomers use the term QSO for this object reserving 'quasar' for radi ...
... 5. Radio-quiet quasars/ and QSO (Quasi Stellar Object) are more luminous versions of Seyfert Type 1 galaxy. They show strong optical continuum emission, Xray continuum emission, and broad and narrow optical emission lines. Some astronomers use the term QSO for this object reserving 'quasar' for radi ...