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- 저자 : Kurczynski, Peter (검색결과 3 건)
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EVOLUTION OF INTRINSIC SCATTER IN THE SFR-STELLAR MASS CORRELATION AT 0.5 < <i>z</i> < 3
Kurczynski, Peter,Gawiser, Eric,Acquaviva, Viviana,Bell, Eric F.,Dekel, Avishai,de Mello, Duilia F.,Ferguson, Henry C.,Gardner, Jonathan P.,Grogin, Norman A.,Guo, Yicheng,Hopkins, Philip F.,Koekemoer, American Astronomical Society 2016 ASTROPHYSICAL JOURNAL LETTERS - Vol.820 No.1
<P>We present estimates of intrinsic scatter in the star formation rate (SFR)-stellar mass (M-*) correlation in the redshift range 0.5 < z < 3.0 and in the mass range 10(7) < M-* < 10(11)M(circle dot). We utilize photometry in the Hubble Ultradeep Field (HUDF12) and Ultraviolet Ultra Deep Field (UVUDF) campaigns and CANDELS/GOODS-S and estimate SFR, M-* from broadband spectral energy distributions and the best-available redshifts. The maximum depth of the UDF photometry (F160W 29.9 AB, 5 sigma depth) probes the SFR-M-* correlation down to M-* similar to 10(7)M(circle dot), a factor of 10-100x lower in M-* than previous studies, and comparable to dwarf galaxies in the local universe. We find the slope of the SFR-M-* relationship to be near unity at all redshifts and the normalization to decrease with cosmic time. We find a moderate increase in intrinsic scatter with cosmic time from 0.2 to 0.4 dex across the epoch of peak cosmic star formation. None of our redshift bins show a statistically significant increase in intrinsic scatter at low mass. However, it remains possible that intrinsic scatter increases at low mass on timescales shorter than similar to 100 Myr. Our results are consistent with a picture of gradual and self-similar assembly of galaxies across more than three orders of magnitude in stellar mass from as low as 10(7)M(circle dot).</P>
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Thinking Through Drawing with William Kentridge
Karen Kurczynski(캐런 커진스키) 현대미술사학회 2016 현대미술사연구 Vol.0 No.39
표현의 자유란 서구 모더니즘의 기본 개념 중 하나일 뿐만 아니라 이미 오래 전부터 동아시아 전통 미술에서도 존재해 온 것으로서, 보편적이고 근본적인 개념이라고 할 수 있다. 표현의 자유는 회화와 같은 2차원 매체에서 가장 잘 이루어 지는데, 최근 몇십 년간 드로잉 분야에서도 두드러지게 나타나고 있다. 드로잉은 현재 동시대 미술에서 주요 매체로서의 지위를 차지하고 있다. 그러나 드로잉이 가지고 있는 사회적이고 이론적인 영향력에 대해서는 명확하게 밝혀지지 않았다. 더욱 중요하게 여길 만한 점은 자유로운 표현이 용이한 드로잉이라는 방식이 갖는 정치적인 영향력이 아직 폭넓게 인식되지 않았다는 것이다. 공과 사, 표현과 절제, 정보와 직관, 개인과 정치에서의 다양한 담론을 일으킬 수 있는 드로잉의 특유한 능력은 좀더 깊이 탐구될 만한 가치가 있다. 추상표현주의에서의 자유로운 표현이라는, 당시 논쟁거리였던 개념을 비판하기 위해 1960년대 개념 미술가들은 드로잉의 미약한 지위를 이용하면서 처음으로 드로잉의 가능성을 확장시켰다. 핸드 드로잉 애니메이션 작업으로 잘 알려진 남아프리카 공화국의 윌리엄 켄트리지 같은 동시대 실천가들은 드로잉을 새로운 방향으로 이끌었다. 켄트리지는 20세기 초반 모더니즘에서 개척된 드로잉의 표현적인 가능성을 활용하여 드로잉을 확장된 사회적 장으로서 개념화시켰다. 그것은 매체를 역사적으로 정의해 온 정치적 문맥에 의문을 제기하기 위해, 그리고 미술계라는 제한된 영역을 넘어 세상의 복잡성을 기록하기 위해서였다. Freedom of expression is a foundational concept of Western modernism. It is closely associated with the two-dimensional mediums of painting and, it has become especially clear in the past few decades, drawing. Drawing has now achieved the status of a major medium in contemporary art; yet the social and theoretical implications of this remain unclear. More importantly, the political implications of its association with free expression have not been widely recognized. Drawing’s unique ability to evoke divergent discourses of public and private, expression and control, information and intuition, the personal and the political, deserves exploration in depth. Conceptual artists first expanded the possibilities for drawing in the 1960s, making use of its marginal status to critique the polemical free expression of abstract expressionism. Contemporary practitioners such as South African artist William Kentridge, known for his hand-drawn animations, have taken drawing in a new direction. Making use of the expressive possibilities pioneered in early 20th-century modernism, Kentridge conceptualizes drawing as an expanded social field to question the political contexts that have defined the medium historically and explore its possibilities for registering the complexity of recent events beyond the limited scope of the art world.
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CANDELS Sheds Light on the Environmental Quenching of Low-mass Galaxies
Guo, Yicheng,Bell, Eric F.,Lu, Yu,Koo, David C.,Faber, S. M.,Koekemoer, Anton M.,Kurczynski, Peter,Lee, Seong-Kook,Papovich, Casey,Chen, Zhu,Dekel, Avishai,Ferguson, Henry C.,Fontana, Adriano,Giavalis American Astronomical Society 2017 ASTROPHYSICAL JOURNAL LETTERS - Vol.841 No.2
<P>We investigate the environmental quenching of galaxies, especially those with stellar masses (M-*) < 10(9.5) Me-circle dot, beyond the local universe. Essentially all local low-mass quenched galaxies (QGs) are believed to live close to massive central galaxies, which is a demonstration of environmental quenching. We use CANDELS data to test whether or not such a dwarf QG-massive central galaxy connection exists beyond the local universe. For this purpose, we only need a statistically representative, rather than complete, sample of low-mass galaxies, which enables our study to z greater than or similar to 1.5. For each low-mass galaxy, we measure the projected distance (d(proj)) to its nearest massive neighbor (M-* > 10(10.5) M-circle dot) within a redshift range. At a given z and M-*, the environmental quenching effect is considered to be observed if the d(proj) distribution of QGs (d(proj)(Q)) is significantly skewed toward lower values than that of star-forming galaxies (d(proj)(SF)). For galaxies with 10(8) M-circle dot < M-* < 10(10) M-circle dot, such a difference between d(proj)(Q) and d(proj)(SF) is detected up to z similar to 1. Also, about 10% of the quenched galaxies in our sample are located between two and four virial radii (R-Vir) of the massive halos. The median projected distance from low-mass QGs to their massive neighbors, d(proj)(Q)/R-Vir, decreases with satellite M-* at M-* less than or similar to 10(9.5) M-circle dot, but increases with satellite M-* at M-* greater than or similar to 10(9.5) M-circle dot. This trend suggests a smooth, if any, transition of the quenching timescale around M-* similar to 10(9.5) M-circle dot at 0.5 < z < 1.0.</P>
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