252 Index 1 Arietis, 181 2 Canum Venaticorum, 113 2 Puppis, 85 6
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Arxiv:1612.03165V3 [Astro-Ph.HE] 12 Sep 2017 – 2 –
The second catalog of flaring gamma-ray sources from the Fermi All-sky Variability Analysis S. Abdollahi1, M. Ackermann2, M. Ajello3;4, A. Albert5, L. Baldini6, J. Ballet7, G. Barbiellini8;9, D. Bastieri10;11, J. Becerra Gonzalez12;13, R. Bellazzini14, E. Bissaldi15, R. D. Blandford16, E. D. Bloom16, R. Bonino17;18, E. Bottacini16, J. Bregeon19, P. Bruel20, R. Buehler2;21, S. Buson12;22, R. A. Cameron16, M. Caragiulo23;15, P. A. Caraveo24, E. Cavazzuti25, C. Cecchi26;27, A. Chekhtman28, C. C. Cheung29, G. Chiaro11, S. Ciprini25;26, J. Conrad30;31;32, D. Costantin11, F. Costanza15, S. Cutini25;26, F. D'Ammando33;34, F. de Palma15;35, A. Desai3, R. Desiante17;36, S. W. Digel16, N. Di Lalla6, M. Di Mauro16, L. Di Venere23;15, B. Donaggio10, P. S. Drell16, C. Favuzzi23;15, S. J. Fegan20, E. C. Ferrara12, W. B. Focke16, A. Franckowiak2, Y. Fukazawa1, S. Funk37, P. Fusco23;15, F. Gargano15, D. Gasparrini25;26, N. Giglietto23;15, M. Giomi2;59, F. Giordano23;15, M. Giroletti33, T. Glanzman16, D. Green13;12, I. A. Grenier7, J. E. Grove29, L. Guillemot38;39, S. Guiriec12;22, E. Hays12, D. Horan20, T. Jogler40, G. J´ohannesson41, A. S. Johnson16, D. Kocevski12;42, M. Kuss14, G. La Mura11, S. Larsson43;31, L. Latronico17, J. Li44, F. Longo8;9, F. Loparco23;15, M. N. Lovellette29, P. Lubrano26, J. D. Magill13, S. Maldera17, A. Manfreda6, M. Mayer2, M. N. Mazziotta15, P. F. Michelson16, W. Mitthumsiri45, T. Mizuno46, M. E. Monzani16, A. Morselli47, I. V. Moskalenko16, M. Negro17;18, E. Nuss19, T. Ohsugi46, N. Omodei16, M. Orienti33, E. -
Lurking in the Shadows: Wide-Separation Gas Giants As Tracers of Planet Formation
Lurking in the Shadows: Wide-Separation Gas Giants as Tracers of Planet Formation Thesis by Marta Levesque Bryan In Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy CALIFORNIA INSTITUTE OF TECHNOLOGY Pasadena, California 2018 Defended May 1, 2018 ii © 2018 Marta Levesque Bryan ORCID: [0000-0002-6076-5967] All rights reserved iii ACKNOWLEDGEMENTS First and foremost I would like to thank Heather Knutson, who I had the great privilege of working with as my thesis advisor. Her encouragement, guidance, and perspective helped me navigate many a challenging problem, and my conversations with her were a consistent source of positivity and learning throughout my time at Caltech. I leave graduate school a better scientist and person for having her as a role model. Heather fostered a wonderfully positive and supportive environment for her students, giving us the space to explore and grow - I could not have asked for a better advisor or research experience. I would also like to thank Konstantin Batygin for enthusiastic and illuminating discussions that always left me more excited to explore the result at hand. Thank you as well to Dimitri Mawet for providing both expertise and contagious optimism for some of my latest direct imaging endeavors. Thank you to the rest of my thesis committee, namely Geoff Blake, Evan Kirby, and Chuck Steidel for their support, helpful conversations, and insightful questions. I am grateful to have had the opportunity to collaborate with Brendan Bowler. His talk at Caltech my second year of graduate school introduced me to an unexpected population of massive wide-separation planetary-mass companions, and lead to a long-running collaboration from which several of my thesis projects were born. -
Thanet Astronomy Group Astronomy for Everyone in Plain English
Thanet Astronomy Group Astronomy for Everyone in Plain English What to see December 29th Constellation (Orion) Stars (Betelguese, Bellatrix, Alnitak, Alnilam, Mintaka, Rigel, Saiph,) Asterism (The Winter Triangle) Stars (Betelguese, Sirius, Procyon) November to March the constellation Orion the Hunter is at its best. There are some 20 prominent stars in this constellation. The brightest and more easily observed stars are the 8 in the main body. The other stars form Orion's right arm with club, and a slain animal in his left hand. These stars are dimmer and difficult to see due to light pollution. At 8:00pm Looking South East at 119° up to 30° you see the star Betelguese, the top left corner of Orion, a red super giant, more than 1½ billion kms in diameter. Look at 127° up to 33° you see the star Bellatrix, the top right corner of Orion, at 8½ million kms in diameter. Look at 128° down to 24° you see Alnitak, the first of three stars side by side, forming Orion's belt. Alnitak, Alnilam (at 128° 25°) and Mintaka (at 129° 26°). Probably one of the more easily recognised groups of stars in this area of sky. Look at 137° down to 21° you see the star Rigel, the bottom right corner of Orion. A blue/white super giant, 108 million kms in diameter. Look at 130° down to 16° you see the star Saiph the bottom left corner of Orion, nearly 31 million kms in diameter. Orion Stars Orion the Hunter In August I wrote about The Summer Triangle. -
Meeting Announcement Upcoming Star Parties And
CVAS Executive Committee Pres – Bruce Horrocks Night Sky Network Coordinator – [email protected] Garrett Smith – [email protected] Vice Pres- James Somers Past President – Dell Vance (435) 938-8328 [email protected] [email protected] Treasurer- Janice Bradshaw Public Relations – Lyle Johnson - [email protected] [email protected] Secretary – Wendell Waters (435) 213-9230 Webmaster, Librarian – Tom Westre [email protected] [email protected] Vol. 7 Number 6 February 2020 www.cvas-utahskies.org The President’s Corner Meeting Announcement By Bruce Horrocks – CVAS President Our next meeting will be held on Wed. I don’t know about most of you, but I for February 26th at 7 pm in the Lake Bonneville Room one would be glad to at least see a bit of sun and of the Logan City Library. Our presenter will be clear skies at least once this winter. I believe there Wendell Waters, and his presentation is called was just a couple of nights in the last 2 months that “Charles Messier and the ‘Not-Comet’ Catalogue”. I was able to get out and do some observing and so I The meeting is free and open to the public. am hoping to see some clear skies this spring. I Light refreshments will be served. COME AND have watched all the documentaries I can stand on JOIN US!! Netflix, so I am running out of other nighttime activities to do and I really want to get out and test my new little 72mm telescope. Upcoming Star Parties and CVAS Events We made a change to our club fees at our last meeting and if you happened to have missed We have four STEM Nights coming up in that I will just quickly explain it to you now. -
The Evening Sky Map a DECEMBER 2018 N
I N E D R I A C A S T N E O D I T A C L E O R N I G D S T S H A E P H M O O R C I . Z N O n i f d o P t o ) l a h O N r g i u s , o Z l t P h I C e r o N R ( I o r R r O e t p h C H p i L S t D E E a g r i . H ( B T F e O h T NORTH D R t h N e M e E s A G X O U e A H m M C T i . I n P i N d S L E E m P Z “ e E A N Dipper t e H O NORTHERN HEMISPHERE o M T R r T The Big The N Y s H h . E r o ” E K Alcor & e w ) t W S . s e . T u r T Mizar l E U p W C B e R e a N l W D k b E s T u T MAJOR W H o o The Evening Sky Map A DECEMBER 2018 n E C D O t FREE* EACH MONTH FOR YOU TO EXPLORE, LEARN & ENJOY THE NIGHT SKY URSA S e L h K h e t Y E m R d M A n o A a r Thuban S SKY MAP SHOWS HOW P Get Sky Calendar on Twitter n T 1 i n C A 3 E g R M J http://twitter.com/skymaps O Sky Calendar – December 2018 o d B THE NIGHT SKY LOOKS U M13 f n O N i D “ f L D e T DRACO A o c NE O I t I e T EARLY DEC PM T 8 m P t S i 3 Moon near Spica (morning sky) at 9h UT. -
Explore the Universe Observing Certificate Second Edition
RASC Observing Committee Explore the Universe Observing Certificate Second Edition Explore the Universe Observing Certificate Welcome to the Explore the Universe Observing Certificate Program. This program is designed to provide the observer with a well-rounded introduction to the night sky visible from North America. Using this observing program is an excellent way to gain knowledge and experience in astronomy. Experienced observers find that a planned observing session results in a more satisfying and interesting experience. This program will help introduce you to amateur astronomy and prepare you for other more challenging certificate programs such as the Messier and Finest NGC. The program covers the full range of astronomical objects. Here is a summary: Observing Objective Requirement Available Constellations and Bright Stars 12 24 The Moon 16 32 Solar System 5 10 Deep Sky Objects 12 24 Double Stars 10 20 Total 55 110 In each category a choice of objects is provided so that you can begin the certificate at any time of the year. In order to receive your certificate you need to observe a total of 55 of the 110 objects available. Here is a summary of some of the abbreviations used in this program Instrument V – Visual (unaided eye) B – Binocular T – Telescope V/B - Visual/Binocular B/T - Binocular/Telescope Season Season when the object can be best seen in the evening sky between dusk. and midnight. Objects may also be seen in other seasons. Description Brief description of the target object, its common name and other details. Cons Constellation where object can be found (if applicable) BOG Ref Refers to corresponding references in the RASC’s The Beginner’s Observing Guide highlighting this object. -
C. Mintaka, Alnitak, Alnilam
Post-18.1: This graph shows the functional form of the dependence of the parallax angle on the distance an object is from Earth. If the minimum parallax angle we could measure were 0.5 arcsec, what is the maximum distance of a star that we could measure? a. ~ 1.00 arcsec b. ~ 2.2 pc c. ~ 10 pc ©2014 W. W. Norton & Company, Inc. 8 Post-18.1: This graph shows the functional form of the dependence of the parallax angle on the distance an object is from Earth. If the minimum parallax angle we could measure were 0.5 arcsec, what is the maximum distance of a star that we could measure? a. ~ 1.00 arcsec b. ~ 2.2 pc c. ~ 10 pc ©2014 W. W. Norton & Company, Inc. 9 Post-18.2: The Moon never stops in its orbit; however, it is possible to get an exact measurement of its parallax and thus its distance at any given moment. How would we get the parallax shift of the Moon? a. Take simultaneous measurements from two locations. b. Take two measurements at different times from one location. c. Take two measurements from the same location at the same phase of the Moon. ©2014 W. W. Norton & Company, Inc. 10 Post-18.2: The Moon never stops in its orbit; however, it is possible to get an exact measurement of its parallax and thus its distance at any given moment. How would we get the parallax shift of the Moon? a. Take simultaneous measurements from two locations. b. Take two measurements at different times from one location. -
Winter Constellations
Winter Constellations *Orion *Canis Major *Monoceros *Canis Minor *Gemini *Auriga *Taurus *Eradinus *Lepus *Monoceros *Cancer *Lynx *Ursa Major *Ursa Minor *Draco *Camelopardalis *Cassiopeia *Cepheus *Andromeda *Perseus *Lacerta *Pegasus *Triangulum *Aries *Pisces *Cetus *Leo (rising) *Hydra (rising) *Canes Venatici (rising) Orion--Myth: Orion, the great hunter. In one myth, Orion boasted he would kill all the wild animals on the earth. But, the earth goddess Gaia, who was the protector of all animals, produced a gigantic scorpion, whose body was so heavily encased that Orion was unable to pierce through the armour, and was himself stung to death. His companion Artemis was greatly saddened and arranged for Orion to be immortalised among the stars. Scorpius, the scorpion, was placed on the opposite side of the sky so that Orion would never be hurt by it again. To this day, Orion is never seen in the sky at the same time as Scorpius. DSO’s ● ***M42 “Orion Nebula” (Neb) with Trapezium A stellar nursery where new stars are being born, perhaps a thousand stars. These are immense clouds of interstellar gas and dust collapse inward to form stars, mainly of ionized hydrogen which gives off the red glow so dominant, and also ionized greenish oxygen gas. The youngest stars may be less than 300,000 years old, even as young as 10,000 years old (compared to the Sun, 4.6 billion years old). 1300 ly. 1 ● *M43--(Neb) “De Marin’s Nebula” The star-forming “comma-shaped” region connected to the Orion Nebula. ● *M78--(Neb) Hard to see. A star-forming region connected to the Orion Nebula. -
Naming the Extrasolar Planets
Naming the extrasolar planets W. Lyra Max Planck Institute for Astronomy, K¨onigstuhl 17, 69177, Heidelberg, Germany [email protected] Abstract and OGLE-TR-182 b, which does not help educators convey the message that these planets are quite similar to Jupiter. Extrasolar planets are not named and are referred to only In stark contrast, the sentence“planet Apollo is a gas giant by their assigned scientific designation. The reason given like Jupiter” is heavily - yet invisibly - coated with Coper- by the IAU to not name the planets is that it is consid- nicanism. ered impractical as planets are expected to be common. I One reason given by the IAU for not considering naming advance some reasons as to why this logic is flawed, and sug- the extrasolar planets is that it is a task deemed impractical. gest names for the 403 extrasolar planet candidates known One source is quoted as having said “if planets are found to as of Oct 2009. The names follow a scheme of association occur very frequently in the Universe, a system of individual with the constellation that the host star pertains to, and names for planets might well rapidly be found equally im- therefore are mostly drawn from Roman-Greek mythology. practicable as it is for stars, as planet discoveries progress.” Other mythologies may also be used given that a suitable 1. This leads to a second argument. It is indeed impractical association is established. to name all stars. But some stars are named nonetheless. In fact, all other classes of astronomical bodies are named. -
The Observer's Handbook for 1912
T he O bservers H andbook FOR 1912 PUBLISHED BY THE ROYAL ASTRONOMICAL SOCIETY OF CANADA E d i t e d b y C. A, CHANT FOURTH YEAR OF PUBLICATION TORONTO 198 C o l l e g e St r e e t Pr in t e d fo r t h e So c ie t y 1912 T he Observers Handbook for 1912 PUBLISHED BY THE ROYAL ASTRONOMICAL SOCIETY OF CANADA TORONTO 198 C o l l e g e St r e e t Pr in t e d fo r t h e S o c ie t y 1912 PREFACE Some changes have been made in the Handbook this year which, it is believed, will commend themselves to observers. In previous issues the times of sunrise and sunset have been given for a small number of selected places in the standard time of each place. On account of the arbitrary correction which must be made to the mean time of any place in order to get its standard time, the tables given for a particualar place are of little use any where else, In order to remedy this the times of sunrise and sunset have been calculated for places on five different latitudes covering the populous part of Canada, (pages 10 to 21), while the way to use these tables at a large number of towns and cities is explained on pages 8 and 9. The other chief change is in the addition of fuller star maps near the end. These are on a large enough scale to locate a star or planet or comet when its right ascension and declination are given. -
Southern Sky.Pdf
R E A I N S D N I O C I A T T C E E D R I A D L O S S N A G P T M H O E C . H N O O R Z m a r w I i e t h h t I t Z s h t e c i R O g p o e l d O N d t e a n H h C t f l e E I n e o R c i H e t C T a l f L l r o e E D t m s N ( n G NORTH F o A r c O e e M t R H k n T O i E m I a f X N C y A t a . E h Z M s o S i l P E o s P L g e H i SOUTHERN HEMISPHERE E y r A T . A “ N M N E O Capella E Y R W T K T H E S ” B . ) . D O W T E r U i T The Evening Sky Map o W R A n N C DECEMBER 2002 , W . O T T e L l h FREE* EACH MONTH FOR YOU TO EXPLORE, LEARN & ENJOY THE NIGHT SKY H a e E γ E M31 h R H w S AURIGA Algol A u K r n Y S o t T SKY MAP SHOWS HOW r e M C e r E t A , s J P i n s B o A O Sky Calendar – December 2002 t THE NIGHT SKY LOOKS M38 h R m L e O PERSEUS a A U b I e r N s T NE ANDROMEDA i S l EARLY DEC PM D g 10 M37 E a h M36 L c 1 Moon near Venus and Mars at 11h UT (morning sky). -
Report of Contributions
Mapping the X-ray Sky with SRG: First Results from eROSITA and ART-XC Report of Contributions https://events.mpe.mpg.de/e/SRG2020 Mapping the X- … / Report of Contributions eROSITA discovery of a new AGN … Contribution ID : 4 Type : Oral Presentation eROSITA discovery of a new AGN state in 1H0707-495 Tuesday, 17 March 2020 17:45 (15) One of the most prominent AGNs, the ultrasoft Narrow-Line Seyfert 1 Galaxy 1H0707-495, has been observed with eROSITA as one of the first CAL/PV observations on October 13, 2019 for about 60.000 seconds. 1H 0707-495 is a highly variable AGN, with a complex, steep X-ray spectrum, which has been the subject of intense study with XMM-Newton in the past. 1H0707-495 entered an historical low hard flux state, first detected with eROSITA, never seen before in the 20 years of XMM-Newton observations. In addition ultra-soft emission with a variability factor of about 100 has been detected for the first time in the eROSITA light curves. We discuss fast spectral transitions between the cool and a hot phase of the accretion flow in the very strong GR regime as a physical model for 1H0707-495, and provide tests on previously discussed models. Presenter status Senior eROSITA consortium member Primary author(s) : Prof. BOLLER, Thomas (MPE); Prof. NANDRA, Kirpal (MPE Garching); Dr LIU, Teng (MPE Garching); MERLONI, Andrea; Dr DAUSER, Thomas (FAU Nürnberg); Dr RAU, Arne (MPE Garching); Dr BUCHNER, Johannes (MPE); Dr FREYBERG, Michael (MPE) Presenter(s) : Prof. BOLLER, Thomas (MPE) Session Classification : AGN physics, variability, clustering October 3, 2021 Page 1 Mapping the X- … / Report of Contributions X-ray emission from warm-hot int … Contribution ID : 9 Type : Poster X-ray emission from warm-hot intergalactic medium: the role of resonantly scattered cosmic X-ray background We revisit calculations of the X-ray emission from warm-hot intergalactic medium (WHIM) with particular focus on contribution from the resonantly scattered cosmic X-ray background (CXB).